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Marine Ecology - Science topic

Interested in Marine Ecological research like demersal living resources and their community structrure. Primary productivity, Food chain, etc
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Hi,
As I konw, like stable isotope, amino acid compound-specific isotope analysis, these methods can all used to identify the habitat use and geographic origins and migration of migratory species.
Can you tell me other methods also can be used to do this area. may be otolith of fish.
regards,
BIN
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you can consult this book
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We will be conducting a survey for marine birds and mammals this summer and we were wondering if anyone has experience with using voice to text software to record marine bird/mammal observations during at-sea surveys? We are planning to use dLog survey software (R.G. Ford Consulting), or equivalent, which has a user interface with data entered into discrete boxes. Each observation is given a time and lat/long location once the user hits the RETURN key to log the observation. Given limited space for computer/handheld GPS/etc. near the observation platform, however, we would be interested in hearing if other researchers have been able to successfully use a voice to text software to record observational data. Such a system would help overcome the limited space issue.
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You can have a look at this -------
Sounding the Call for a Global Library of Underwater ...
https://www.frontiersin.org › fevo.2022.810156 › full
08-Feb-2022
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I am reading about pilot projects of seed production of Ostrea edulis, found only some abstract from old paper mentioning north Spain, but I don't know if it is actually working in the mariculture companies on the Med.
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Sustainable large‐scale production of European flat oyster ...
https://onlinelibrary.wiley.com › doi › full › raq
by B Colsoul · 2021
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Thalassia hemprichii to be specific.
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What are the scientifically confirmed examples of changes in marine and ocean ecosystems caused by the probably faster global warming process and the increasing pollution of sea water toxic waste and assessments?
Please reply
I invite you to the discussion
Thank you very much
Best wishes
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Dear Prabhat Ranjan,
Yes, the process of global warming is causing disturbing environmental changes also in the Arctic zone.
Thank you very much,
Greetings,
Dariusz Prokopowicz
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I'm wondering if some of you are aware of existing conversion factors for levels of metallic contamination in fish muscle tissues. In the present work, I'm focusing on metallic contamination, so not currently interested in lipid content of the tissues.
Depending of the contexts, concentrations are expressed relatively to fresh or dry weight. By example, working on muscle sample is more convenient when dried, but concentrations are expressed relatively to wet weigh in European directives, requiring conversion factors.
In most of the paper I read, concentrations are expressed relatively to wet or dry weight, and are then converted using a 5 times conversion ratio. But no information about the actual measurement of the ratio is provided, and I feel this value is largely empirical.
So, is someone aware of the rationale for this value ? Are you aware of papers specifically investigating this point ?
Thanks
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Pierre Cresson , great paper, I downloaded it early today and then came looking for more info on the conversion subject, and found the author himself :D Thank you!
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I would highly appreciate it if my fellow ecologists (biologists) provide their opinion on the thoughts below [esp., shortly tell us which path may be more effective, if they know another way, if there is a recent breakthrough toward this goal].
To consider the effects of Acclimation and Directional Selection on populations' thermal sensitivity in the (mechanistic or phenomenological) modeling of ecological impacts of temperature variability (and climate change), we can follow two general paths:
(1) To produce enough empirical data to define simplistic indices of warm adaptation capacity (based on exposure temperature and duration) for at least some keystone species [a simple e.g., ARR; Morley et al., 2019]. Such indices can only be applied to models' outputs.
(2) To understand the GENERAL mechanisms (principal functional components) defining the heat sensitivity of various taxa [e.g., OCLTT, Pörtner, 2010], define how the component (quantitatively) relates to the capacity for rapid warm adaptation [no Ref.], and set (adaptive) feedback loops in existing models [a simple e.g., Kingsolver et al., 2016].
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Hello Jahangir; You will want to see this paper.
Riddell, et al. 2021. Exposure to climate change drives stability or collapse of desert mammal and bird communities. Science 371(6529); 553, 633-635.
It makes comparisons over a 100 year span of time in the Mojave Desert in California. Thermoregulation!
Best regards, Jim Des Lauriers
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Hi guys,
So I am currently working on the methodology for a macroalgae decomposition study, assessing changes in weight and nutrient contents (specifically N and P) at varying stages through the decomposition process. My question really relates to the preparation of the samples for shipment to a lab for the necessary analysis:
1. Like similar studies I have read, I intend to dry the recovered material at 60 degrees C, and grind the thalli using mortar and pestle. I have read that liquid nitrogen can be used to make the use of the mortar and pestle more efficient, as it freezes the thalli making it more brittle. Since the liquid nitrogen obviously makes the material brittle enough to grind into a powder, is it still necessary to dry the thalli at 60 degrees C?
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Yes, it should definitely be dried, and that is why proteins (a source of nitrogen) have a high capacity to absorb water and store it in the tissues. Therefore, the final results of calculating the nitrogen percentage will be definitely affected.
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The only way for companies that carry out ecological activities to be implemented in the future is to surpass polluting companies in their field, being more competitive than them, through technologies such as Blockchain and innovation in production processes. Discover how carbon credits are going to help green companies be profitable and how prosumers are going to play a leading role in that process
Can cryptocurrencies be used to make ecology profitable?
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Dear Asiel,
The seven principles are 1) maintain diversity and redundancy, 2) manage connectivity, 3) manage slow variables and feedbacks, 4) foster complex adaptive systems thinking, 5) encourage learning, 6) broaden participation, and 7) promote polycentric governance systems.
Profitable how? Just example
1. The Environmental Profit & Loss (EP&L) methodology, a pioneering corporate natural capital accounting methodology is helpful to enrich profit margin of ecology. The same time, Environment & Non-Profit by on Theme Forest to save is profitable to the world.
2. Optimized rainfall.
3. Managing sunlight, plants and time
4. Producing profits from plants and animals
5. Producing time for recreation
6. Producing habitat for flora and fauna
7. Managing for complex perennial grassy woodlands
8. Managing for complex perennial grassy woodlands
Ashish
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I am trying to publish a couple of articles in order to improve my scientist CV...
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Marine Biology | Home - Springer
www.springer.com › journal
CALL FOR PAPERS:Marine Biology Special Issue: The Impact of Marine Plastic Debris on Life in the SeaSee details under Journal Updates / Call for PapersMarine . ... original and internationally significant contributions from all fields of marine biology
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I'm wondering if someone is aware of studies investigating the integration time of mercury in fish tissues, mostly muscle. In other words, when a Hg concentration is measured in muscle, is it the result of previous contamination during weeks? months ? years ? I found some papers investigating Hg dynamics in mammals or birds, but I can't find similar studies in fish. This information would be crucial when trying to infer trophic patterns from several biomarkers (eg stable isotopes, fatty acids or contaminants) with different integration time.
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yes, it is, because it is very good for health.
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Hi all, I will appreciate if you could direct me to a paper where I can find the stomach pH in crustaceans. I am sure it will vary between species, yet any data will be useful and much appreciated.
Thanks
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It is depend on what time of animal digestibility or other living activity but around neutral pH.
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This can be detailed or anecdotal, quantitative or qualitative. Over the course of years or decades. Anything that reports changes in the size of the canopy forming species.
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I need to compare our data to the acceptable upper limit heavy metal concentration in mussels which affect human health proposed by different countries.
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It is experimentally proved that turf algae in combination with sediment prevents the settlement of coral larvae. My field observations are contradictory to it. I observed lot of new recruits on hard substrate which has been covered with turf algae and sediment. Is there any other factor which could aid the settlement of coral larvae on a turf algal substrate?
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We are identifying a large numbers of detrital mineral samples from the marine sediments. We have excluded staining method because it takes a lot of time.
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For microscopy, we should not forget that determination of refractive indices (RI) can be quite useful and fairly quick. For example, if you use a liquid of RI 1.527, Or grains would have lower RI in any orientation, whereas Qtz and Pl grains would have highern RIs. Carbontes should not pose any problem because of their high interference colour. But the procedure is tedious and gone unpopular.
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UPD: This week we have a great news! The deparment will function as separate one as it was during last 90 year and continue marine and fresh water investigations! We are realy happy and thankful to everyone who wrote letters and signed the petition!
________________________________________
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I have analyzed the concentration of heavy metals in water as well as the intertidal sediment. I have not been able to find literature as to why the heavy metal content in sediment is more than the water. Can anyone help me? I would also like to know the permissible range for various heavy metals in marine water sample and sediment.
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I studied the fluxes between sediment and water in heavy metal in very polluted river sediments. Redox conditions and dissolved organic matter have a very important role
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The specimen is under the genus Heterocarpus obtained from Indian coast between the depth range of 250-350. I would like to know the species level identification, based on rostrum deformed nature character of the Heterocarpus, it is doubtful. I Kindly request to identify the species.
Thanking you
Kuberan
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Follow
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From what I can gather, the various studies that have evaluated decomposition in marine and freshwater habitats have used different methods, and I'd like to know which of these two habitats typically has more rapid decay rates.
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Hi Scott, Antje Bierschenk assessed cellulose breakdown across a freshwater-marine continuum in 10 New Zealand catchments using two different cotton material types. Her work is published: "Bierschenk, A. M., C. Savage, C. R. Townsend, and C. D. Matthaei. 2012. Intensity of land use in the catchment influences ecosystem functioning along a freshwater‐marine continuum. Ecosystems15: 637–651."
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Hi,
I had originally thought that distinguishing between fixed and random factors was relatively self explanatory, however, having read an article on this very subject, I am now not so certain.
The author's decision tree (see below), particularly the part stating that any factor with 2-4 levels 'must' be fixed left me especially confused.
"A) Can I talk you out of including it? (solved – drop it from the model)
A) No I can’t talk you out of it? too bad. Go to B
B) Is it a continuous variable or has only a few levels (e.g. 2-4) → has to be fixed
B) OK, a choice is possible – go to C.
C) Do you want estimates of s1, s2,…,sn (perhaps because you have lots of data and so lots degrees of freedom to burn and are curious how sites differ)? →Fixed
C) Do you want estimates of σ2, perhaps because it saves you degrees of freedom you really need or perhaps because the variance is more interesting (or useful for variance partitioning) than a bunch of estimates of site effects nobody will ever look at? go to D
D) can you either keep the design really simple or are willing to give up p-values→Random
D) You’re kind of out of luck. Change one of your answers and try again"
The article also links to a discussion regarding the recommended number of groups for a factor to be random, which conforms with much of what he has said in his article.
I'm no statistician, so much of this goes straight over my head.
For my particular research question, I'm looking at differences in the composition and abundance of fishes associated with three different coral colony states (live, dead, overgrown by a particular 'coral-killing' sponge species).
I've collected my data from 6 sites, split between two islands. I've also recorded the particular growth form of each coral colony.
To summarise, my factors are as follows:
Colony state (live, dead, overgrown)
Growth form (encrusting, submassive, columnar)
Site (6; nested in Island)
Island (2)
I had originally performed Permanova (in Primer7) using colony state and growth form as fixed factors, with site and island as random. However, as per the advice of the aforementioned articles, I tried again with all four factors as fixed, which produced very different results from my original design. I've tried other combinations of fixed/random, which again, produce very different results.
Basically I'm just looking for any advice as to the correct way to proceed with this, and if anyone could provide a more definitive answer with how to determine the appropriate effect for one's factors.
Thanks in advance.
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Hi Joseph, I'm not sure if this is quite what is meant by Brian McGill. I will review the article again but I felt that his comments were concerned with
  1. parametric analysis of data and the associated assumptions made about that data; and
  2. making the distinction between blocking factors which could confound the results.
So from your description of your data and the factors:
  1. At a superficial level, the categorical values you have mentioned cannot be considered as blocking factors as they are not continuous values.
  2. The use of non-parametric analysis also removes the imposition of assumptions of distribution.
  3. The issue with categorical values is they sometimes represent an aggregation of information which may confound the results of analyses (and this is where the article is focused).
  4. The selection of sites in any experimental design is assumed to be random and therefore they should be considered as random factors in the analysis.
  5. The State and Growth factors are interesting. If I understand correctly, they are to be considered as potential determinants in fish diversity and abundance. If so, they should be regarded as fixed factors. If they are regarded as random factors, the relationship between fish diversity and abundance and those factors becomes substantially more complicated.
  6. You probably know this better than anyone, but results of statistical analyses tend to pose more questions than answers. So the iterative process will required you to look at the results and re-analyse.
It really does come down to your understanding of the ecosystems in which you sampled, and the variable you have collected. Investigating the independence of the factor you have collected prior to any construction of models or multivariate analyses is important. If they are independent, the assumption is that they are not confounding (or "blocking") factors and relationships between them can be compared as causal (or not, as the case may be).
From my point of view, I do not think you have done anything untoward in relation to considering all factors as random in the original PERMANOVA analysis. You could play with the Growth and State factors. However, I would suggest that you consider Bayesian analyses to determine the "degree of belief in an event" because (taken straight from Wikipedia but I've never seen expressed more clearly).
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Dear researchers,
someone has a shapefile of marine sea temperature hotspots worlwide desribed in Hobday & Pecl (2014).
Thanks in advance for sharing.
Regards
Ignacio
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Dear
Mehdi Asadi
thank you very much for your link!
I have also found a direct link for what I was looking for!
Thanks again!
Regards
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I'm planing to travel on vacances to europe, probably to Portugal and perhaps countries nearer to Portugal, as Spain, France and Italy.
I'm interested on visiting labs, institutes, museuns related to my working areas (Fish and benthic ecology, as also environmental education), so, I'm asking for some recomendations from researshers from these countries.
Thanks in advance for any help.
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O Oceanario de Lisboa pode te trazer boas contribuições em Educação para a conservação marinha.
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Hi everyone! need to get the identity of this nudibranch. Collected from the trawl net gear operated at depths 10-50 m. East coast of India.
best regards
Deepak
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Dear Dr Deepak Samuel Vijay Kumar,
This slug looks like Armina variolosa (Bergh, 1904).
Regards
Ravinesh @ Deepak Samuel Vijay Kumar
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I am looking to buy these IN STORE and not make my own. I only want to count the concentration of phytoplankton.
I am looking to preserve phytoplankton from water samples taken in the field. Has anyone tried tincture of iodine to do this?
The tincture of iodine I was looking at was made up of: 2.5% KI, and 2.5 % I2 and then half and half alcohol and distilled water (from the drug store)
The Lugol's solution I was looking at 10% KI, 5% I2, and 85 % distilled water (from amazon)
I am curious to know if I could use off the shelf preservatives instead of the having to buy the expensive ones online
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I prepare my own Lugol,s iodine dissolution ( concentrate):
ACID ONE: 100g KI 50g I2 1in 1l distilled water + 100g glacial acetic for samples with pH<7 (Willen, 1962)
BASIC ONE: 100g KI 50g I2 1in 1l distilled water + 100g CH3COO-Na for samples with pH>=7 (Utermöhl 1958)
i add 0,5-1 ml Lugol /100ml sample
best regards
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Does anyone know what is the average stomach size (weight, volume) of an average common shark species like
Pelagic thresher (Alopias pelagicus)
mako (Isurus oxyrinchus)
blue (Prionace glauca)
scalloped hammerhead (Sphyrna lewini)
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Dear Xavier,
I also recommend this reading:
Body morphometrics, swimming diversity and niche in demersal sharks: a comparative case study from the Mediterranean Sea March 2010 Scientia Marina 74(1):37-53 DOI: 10.3989/scimar.2010.74n1037 LicenseCC BY 4.0
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Recently, there is an emerging series of studies querying that organic carbon burial in blue carbon ecosystems is largely offset by calcium carbonate. Is it true? As I know, calcium carbonate can only be decomposed to calcium oxide and carbon dioxide at temperatures above 840 degree celsius. The sediment temperature in sediments of blue carbon ecosystems can not be so high to decompose calcium carbonate. On the other hand, calcium carbonate is generally not dissolved in water. According to Frear & Johnston (1929), the dissolubility of calcium carbonate in water is 9 mmol per kg water at 1 standard atmosphere pressure. With increasing CO2 in the atmosphere and seawater, calcium carbonate in marine waters may react with CO2 to produce calcium bicarbonate. To summary, I think this query is unreasonable. What do you think about it?
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Considering the rapid rise of interest in blue carbon as a climate change mitigation and adaptation strategies, we argue that calcium carbonate cycling needs to be included when assessing the importance of these globally significant carbon stores as CO2 sinks. Addressing calcium carbonate cycling in blue carbon accounting is timely given that anthropogenic activities and climate change may alter calcium carbonate cycling within coastal ecosystems with unknown feedbacks for climate change. For example, with increasing atmospheric CO2 and ocean acidification, the ratio of released CO2 to precipitated calcium carbonate is expected to rise (Frankingnoulle et al. 1995). Yet increased calcium carbonate dissolution , and decreased calcification rates are also coupled to higher atmospheric CO2, with both processes lowering the rate of CO2 fluxed to the atmosphere. Moreover, partial dissolution of the large calcium carbonate stock deposited in blue carbon ecosystems may provide a buffer to ocean acidification while acting as a CO2 sink. Clearly accounting for calcium carbonates in blue carbon systems is a tricky business.
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The image was sent to me by a diver. It was taken at a depth of 52m in Malta (Central Mediterranean). The 'sphere' was about 1 m in diameter and was moving with the currents. It seemed to be a 'shell' of jelly with no obvious structure. All I can think of is the remains of some gelatinous planktonic organism. Any ideas?
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To Dr. Schembri
We are looking into similar gelatinous spheres from the Norwegian coast, and are very interested in getting in contact With the observer. Could you please give me her/ his name and e-mail adress as soon as possible?
Kind regards, Halldis Ringvold
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Hello
I have used the 'standard' umbrella plastic anchor/dart (developed I believe by Michael Domier) for over 10 years to PAT-tag great white sharks, with much better retention of tag by shark and less or longer premature releases, than with the original titanum 'flat arrow' anchors/darts.
Now I am about to embark in the tagging of smaller fish, Mobula rays.
My question is if someone out there has been using the smaller version of the Domeier umbrella anchor/dart, the one that is 20 mm in length as opposed to the 31 mm ('standard') umbrella dart (see link below)
I am worried that this smaller version of the anchor might not have good enough retention of tags on fish. I will be using mini-PAT tags on Mobula rays that are between 1 and 2.5 m of disc width.
Any positive or negative experiences anyone can share about using the 20mm umbrella anchors for PAT tagging will be much appreciated.
Thanks in advance.
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Hi Alessandro
Similar mix of species to what we have in the Mexican Pacific... We tagged a few M. tarapacana in Brazil and we are writing a paper about that. For those (up to 3 m DW) I see no issue with the 31 mm darts. But for the 1.5 m animals and smaller I would go with the 20 mm darts.
Good luck
Ramón
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Hi everyone,
I would like to know if there are online available and free world-wide datasets of sea surface temperature, net primary productivity, salinity, pH and dissolved oxygen.
Best wishes,
Diego
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Check out the GlobColour project, which started in 2005 as an ESA Data User Element (DUE) project to provide a continuous data set of merged L3 Ocean Colour products. Through their website (http://hermes.acri.fr/index.php) you can access datasets dating back to 1997 and have re-processed, integrated and tested multiple freely available datasets. Depending on your time-series requirements, you may go for more reliable/accurate based on more recent/modern (individually or merged) sensors.
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I have 17 rocky shore sites. From these sites I have quadrat data with species percent coverage data.
From each of my sites I also have an environmental measure for a gradient I am interested in. I am only really interested in how the community changes over this one gradient.
The problem I have run into is that every method I have read about for constrained ordination/ direct gradient analysis seems to require more than one environmental variable. I only have the one environmental variable that I am interested in. I did measure 2 other variables but they are direct proxys for the one environmental variable I am interested in.
I really want to find a way to do direct gradient analysis on this community data using only the one environmental variable - surely that is possible??
I have already done a nMDS of my data in R and fitted a vector using envfit of my environmental variable. But because the method is unconstrained i feel it is not that informative?
Any help would be really appreciated by this stressed out masters student :)
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Hi Meredith,
Constrained ordination with only one explanatory variable is not the best choice. Yes, you can do it, and there is nothing wrong about it; however, as the main purpose of ordination in general is to reduce dimensionality, in this case you only get one ordination axis (despite the fact that you have several species) and thus you only can assess the gradient in one dimension. The alternative (and not sure how great it is) to 'force' the analysis to by converting your one continuous variable into a categorical variable. Of course, you'd need to have a good and sound rationale to assign categories to it (e.g., natural breaks or something alike). Alternatively, you can double-check if your two other variables are correlated (i.e., colinear) with the one you are interested in, and if not, you can still use them in the analysis. Whether they are significant or not in the model is another story...
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It is hypothesized that harpacticoid copepods are the only meiofaunal organisms to develop larval stages because their nauplii share the same habitat as the adults. I am interested to know whether the nauplii (larvae) and copodite stages of harpacticoid copepods are pelagic or benthic compared to calanoid or cyclopoid copepods?
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Dear Moumita, as you know some marine harp. cop’s. are planktonic. So, for them there is no choice like to develop in plankton. Anyway in freshwater some copepods (cyclopoids) had been found in bottom conditions in wintering (look publ. of Natalia Kovalchuk in hydrobiological J. - in RG! But if I understand well we’re speaking about freshwater benthos! Thus, being involved about 40 years with alive samples of different habitats both fresh and brackish waters I'm absolutely sure that naup. & copep. of h. in freshwaters are mainly inhabited the same biotope as adult that is benthos, periphytos (if fast flow of stream) or submerged in case of lenthic basins! This provide much better survivance of youth as protect them against raptor cyclops!
Andrey
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I'm starting my PhD thesis' research on the terminology of marine pollution and I need well-grounded references.
Thank you to those who might help me!
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Hi Marina,
Check this : Marine Pollution Bulletin (2018). Low prevalence of microplastic contamination in planktivorous fish species from the southeast Pacific Ocean.
download in goo.gl/AVseJH .
Best
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I got this jelly fish in huge quantity while trawling off Kochi.
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First Image Rhopilema sp, second and third are Cyanea sp.
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Hello! Between mid-April and throughout June2017 we carried out an extensive sampling to estimate sea urchin settlers through collectors placed on the bottom floor along the Sinis Peninsula (Westcoast of Sardinia , Italy).
We placed 100 collectors at five metres depth, on rocky bottom and Posidonia oceanica meadows, inside and outside the Marine Protected Area of Sinis (according to the method described by Tomas F, Romero J, Turon X, 2004) to evaluate settlement and recruitment of sea urchin Paracentrotus lividus in two contrasting habitats in the Mediterranean (Marine Ecology Progress Series 282: 173-184). Altogether we collected about 500 samples kept at -20 deg. in 70% alcohol. Moreover, we characterized sampling stations calculating habitat and landscape metrics.
However we found many other species of organisms, especially polychaetes, molluscs, crustaceans, other echinoderms, etc.
At the moment we lack resources to perform taxonomic work on these communities.
We are happy to send over the samples to anyone who could be interested. Considering we do have all the environmental data metrics, it would be great to identify biodiversity hot spots in the study area once we have the taxonomic data.
If interested, please contact me at: s.farina@fondazioneimc.it
Cheers!
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hola Nuria! algo de peces si que hay pero no mucho. Mas o menos de 500 muestras los estudiantes han rencontrado larvas teleostea en 30 de ellas (24 en roca y 4 en posidonia).
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We lost a manta net codend/collecting bag on a recent trawl and need to replace one ASAP. Not sure where to buy a replacement in Melbourne. ANy ideas?
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NOAA's instructions for microplastic.
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We collected many fish eggs in a coral reef off the coast of Vietnam. Is that Scarus genus?
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Hi.
Do you have some publication about this eggs?
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After reading several articles I am a bit confused concerning the benthic species taken into account for the calculation of species richness and index like I2EC. In the description of I2EC (Grall & Glemarec, 2003) it is mentioned that fixed epifauna should not be counted. What about the vagile epifauna such as many molluscs of hard substrates (Nassarius, Chitons ...) ? I don’t understand why they are listed in mudflat case. What about Serpulidae species like Spirobranchus ?
Concerning the AMBI, normally used in soft sediment habitats, the list of ecological groups contains species like: Balanus trigonus, Nassarius sp., Actinia sp., Tethya sp., Polycarpa sp.
Looks like every study has its own recipe, and it is not possible to know which benthic species are taken into account by the authors for the calculation of each index.
In my opinion, different indices (AMBI, I2EC) must use different lists (infauna with or without epifauna), and each list should be clearly detailled to ensure reproductibility and comparison.
Can anyone enlighten me on this subject ?
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As we all know that more and more marine habitats are degenerating because of anthropogenic activities in the ocean and other reseaons, for example, fishing, climate changes. So we need to do something to change the situation.
Can you guys give me some restoration mehods or suggestions, especially for the coastal area.
regards,
BIN
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Hope this PDF is useful
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Hello guys,
Can you send me some papers which published on Science or Nature journal about ecological integrity or ecological connectivity and biodiversity conservation.
regards,
BIN
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Dear Bin,
Please have a look at these useful PDF attachments.
Good luck
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To understand aquatic ecosystem and its ecological and biochemical characteristics interacting the pollution with the organism, methods for dynamic exchange of DOM and POM is essential. So what are the best methods to understand  exchange mechanism of DOM and POM occurring in different aquatic ecosystems?
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Thanks
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Recommendations on books would be helpful.
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Thank you all for your answers. I will check the books that you have mentioned in your messages.
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Dear friends,
The question as I said in the title, I'm not sure about what problems we will get in troubles, If we use the stable isotope approach.
I hava already read some papers about the fish stocking migration between the different habitats.
I think the most problem is that the different tissues hava the different rate of metabolism, for example, the liver and blood cell have very fast rate, just few days, and the white muscle, fin, or bone of fish can present a long period of feeding habit, and the stable isotope values can present previous habitat information. Moreover, the size of fish we collect may be also can influence the result of the stable isotope values, but I'm not sure about it.
you guys can give me some suggetions or advices about the question as much as you konw, if so, thank you very much.
Regards,
Xie Bin
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Hello, your question is very general, the problems in the use of isotopes will depend on the type of isotope you are using. I recommend that you read this book that will help you answer all your questions.
Hobson, K. A., & Wassenaar, L. I. (2008). Tracking animal migration with stable isotopes (Vol. 2). Academic Press.
Viljoen, G. J., Luckins, A. G., & Naletoski, I. (2016). Stable Isotopes to Trace Migratory Birds and to Identify Harmful Diseases: An Introductory Guide. Springer.
I send it to you in attached
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Hi,
According to Quieros et al. 2013, Carcinus maenas falls within the bioturbation class of 'Regenerators'.
'Regenerators' are excavators that dig and continuously maintain burrows in the sediment, such as the fiddler crab Uca spp (see Kristensen et al. 2012). However, I doubt C. maenas is a typical regenerator as it does not maintain a burrow system.
My question to you is, how would you classify this species in terms of bioturbation? In my opinion it could be classified as a surficial biodiffusor as it finds most of its food in the top few cm of the sediment (even though it may occasionally dig deeper for food). I have to mention that the study site is a Dutch intertidal sandflat where we mostly find small specimens.
It would be very helpfull if you can let me know on how you think about it!
Thanks Pieter
Queirós, A. M., Birchenough, S. N. R., Bremner, J., Godbold, J. a, Parker, R. E., Romero-Ramirez, A., … Widdicombe, S. (2013). A bioturbation classification of European marine infaunal invertebrates. Ecology and Evolution, 3(11), 3958–85. https://doi.org/10.1002/ece3.769
Kristensen, E., Penha-Lopes, G., Delefosse, M., Valdemarsen, T., Quintana, C. O., & Banta, G. T. (2012). What is bioturbation? the need for a precise definition for fauna in aquatic sciences. Marine Ecology Progress Series, 446, 285–302. https://doi.org/10.3354/meps09506

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Hi Pieter
The bioturbative effects of the shore crab Carcinus maenas are limited, since many live in hard-substratum environments. But indeed, in sandy areas it shows either locomotion (small footprint but many legs!) or temporary burrowing activity. Burrowing may be either for finding food with chaelae or for hiding. In sandy areas, the shore crab may temporary hide in the sediment completely by digging in backwards. It does not dig deep as it keeps contact with the sediment surface.
This being said, following Kristensen et al. (2012), I would consider the shore crab an 'epifaunal biodiffusor'. C. maenas is not well adapted for living in and moving through the sediment like the examples mentioned for 'surficial biodiffusors' (e.g. burrowing sea urchins). Also following Kristensen et al. (2012) it cannot be considered a 'regenerator' as does not maintain burrows continuously.
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Before posting this question, I'd like to state that the following must not be regarded by any means to a discussion on catching marine mammals in EU seas.
Why are marine mammals (namely very common species of dolphins and pinnipeds) strictly protected in EU waters while Bluefin tunas, rare and collapsing as they are, are still apparently overfished mainly in the Mediterranean's W basin? Do you think that this has something to do with the "cuteness" of marine mammals and the fact that Thunnus thynnus is "just a fish"?
Many thanks for your contributions.
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I think to fully answer this question one would need to analyse why most western people would give marine mammals higher ethical importance than fish like tuna. Such socio-cultural construction is surely very complex. Who would eat "flipper" or his bigger brothers and sisters, the whales. To search for economic explanations is important, but it finds it limitations as whale meat is also costly, not necessarily in Europe, but Japan for example.
In the Solomon Islands every year thousands of dolphins are killed, which causes much outcries, but such outcry would never happen, when the same fate would meet fishes……, no matter how threatened….. The example of the Solomon Islands might suggest that the difference between fish and mammal is not only a European aspect.
The socio-cultural construction of what should be consumed from the ocean and what not has become the basis of strong protection efforts (e.g. Greenpeace, consumer societies which introduced the dolphin friendly tuna label). In some cases, e.g. the protection of most of the whales from getting extinct, has ecological reasons, but do we condole the extinction of the dinosaurs for example. While I speak in favour of protecting bio-diversity it is still worth reflecting, what ethical principles are behind such calls and how these ethical principles are socially constructed and if it makes differences what animal right are concerned.
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Hi everybody
I'm trying to culture Nannochloropsis oceanica CCMP1779 (axenic) under heterotrophic conditions. For the methodology I'm following previous studies where they cultured other Nannochloropsis spp. and trying to do it under the same conditions. Briefly I inoculated some phototrophically (f/2) growing culture into a new medium made of f/2 and 2g/L glucose and incubated in the dark. However nothing has been growing for 2-3 weeks, while the dark/light control (in the same medium) grows very fast. Therefore Nannochloropsis is clearly not growing heterotrophically and the problem does not come from the medium.
Does anyone have any suggestion on how to grow Nannochloropsis heterotrophically? are there substrates more suitable than glucose for heterotrophic cultivation? Is it possible that other Nannochloropsis spp. can grow heterotrophically while N. oceanica can't?
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Dear all, thanks for the suggestions and sorry for the late answer. I finally did not succeed to grow Nannochloropsis with glucose.
I think the inhibition might be to the difficulty in transporting glucose inside the cell.
Sergio
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I am doing a GIS project on different coastal ecosystems and need a representation of such ecosystems. Corals, Mangroves and Seagrass I have, but kelp is missing...Thank you!
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I'm not sure where you can find this shapefile, but it's likely the authors of the attached 2016 paper "Global patterns of kelp forest change over the past half-century" will have one. See Figure 1A. 
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Collection labels shows that this specimen was collected from South China Sea (ca. 14°N, 112°E,>1000 meters depth).
The specimens are very small. One of the specimen looks like having a pair of antenna. Uniramous parapodium with spinigerous compund chaetae. Parapodium well developed with dorsal and ventral cirri.
I don't know which family it belong to.
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Hi! It is a Syllidae. I would try Exogone, Parexogone or similar genera. I hope this helps. Cheers!
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Dear All,
I have collected this Jellyfishes from Visakhapatnam Fishing harbour. I think one is Crambionella sthulmani, other one is Rhizostoma pulmo Anybody kindly identified and confirm it species level.
Regards
K. Silambarasan
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 Dear, 
         Please take jellyfish image within the water .Otherwise identification is difficult process. 
First image is Crambionella stuhlmanni. It is common species in the  East coast of India.
Second image without oral arm I think this specimen has violet Steak in the exumbrella. So it is Thysanostoma loriferum .
Third image is  juvenile stage of Cyanea sp.
Fourth image may be Netrostoma sp. If you have this specimen  please take photos within aquarium tank and send me. I will try to identify .
Fifth one is Pelagia noctiluca .
Please give numbers to the images for identification .
I hope this helps, but if you need more assistance, please let me know! My email is panavoorriyas2@gmail.com
Sincerely, 
Riyas A
 
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These structures appeared spontaneously attached to the bottom of my culture wells where I maintain mediteranean sea anemones larvae. Cultures are kept in unfiltered seawater 25°C. 
On the pictures, the largest cells make about 10µm
(Sorry for the poor quality of the pictures)
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Dear Thamilla, by the pictures, it is not easy to say which species. did the cells could form the round colony? The cells would be zooxanthellae if they were found in the anemones cultures. I agreed with Nancy. However, zooxanthellae normally has the flagellates to swim . you could check them . 
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Hi guys,
By analysing the microbial metagenomics, I found lots of genetic traits related to metal resistance and organic remediation, suggesting the water pollution in ambient seawater.
I've heard that Kaneohe Bay used to be a good snorkelling place in early 90s but then it was polluted.
I am not familiar with the marine chemistry/pollution field, if anyone has the data or knows where I should look at, please let me know. Thanks in advance.
Kind. Fang
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Hey Fang, Did any report or paper ever come from the study on marine microbial metabolism? May I ask you who you were working with? Would love to hear more about your results as I am looking to start some microbial sampling in the bay myself. Thanks!  
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Please explain sandy shore adaptations in marine invertebrates, add specific comments on their physiology.
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There are numerous adaptations that marine invertebrates have in sandy shores. In order to not be swept away from the powerful waves, marine invertebrates such as the paddle crab use paddles on their legs to burrow into the sand (Science Learning Hub 2012). These invertebrates also use this mechanism to prevent desiccation. 
Other marine invertebrates, such as olive snails, have streamlined body shapes (Cabrillo Marine Aquarium 2012). This body shape allows these organisms to burrow into sand easier and to let water pass through right their bodies. 
In addition to that, an issue in terms of access to oxygen arises when these organisms burrow in sand. To address this issue, a siphon, otherwise known as a specialized breathing tube, is used to gain access to the dissolved oxygen from the water by extending this part to the water from the sand (Cabrillo Marine Aquarium 2012). The bent-nosed clam actually makes use of this tube. This particular part is efficient since it also has the ability to prevent sand from gaining access to the gills of the bent-nosed clam(Cabrillo Marine Aquarium 2012).
References:
Cabrillo Marine Aquarium. 2012. The sandy beach environment [Internet]. Los Angeles: Cabrilla Marine Aquarium; [cited 2017 May 12]. Available from: http://www.cabrillomarineaquarium.org/_publications/tr-ss-sandy-beach-environment.pdf
Science Learning Hub. 2012. Adapting to marine habitats [Internet]. New Zealand: University of Waikoto; [cited 2017 May 12]. Available from https://www.sciencelearn.org.nz/resources/1126-adapting-to-marine-habitats
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These corals were observed in the central Red Sea. In some of these photos Acropora if it is possible I need species name. For other even genus name is enough.
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Hi, Jaafar, thats nice to read you - it seems that you are still looking for corals...
Most pictures also show Acropora, but not in all cases its easy to know what coral in particular you're asking for. The photos ## 2 and 3 show some Xeniids, possibly Ovabunda sp., but for species ID samples would need to be checked. Further on # 3: Pocillopora, Millepora exaesa. Photos ## 8, 9 remind me of A. humilis, may be # 5 as well, together with 2 colonies of Montipora sp. For the other Picture I can't enlarge some details, if you send the pictures directly to me, I could try to ID the genera. Good luck for your work, cheers, Goetz.
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I am working on low latitude Paleogene shallow marine fauna of W India and would like to understand the trophic scenario of this fossil community. Where can I find relevant information on extant shallow marine fauna for comparison?
Thank you.
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Siddhartha:
Your question embraces broad spectrum of shallow marine environments, but this classic link would provide you essential insights:
Best
Syed
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Hi All,
I'm interested in opinions of experts on the age of this sample Alaska plaice (Pleuronectes quadrituberculatus) from south-western part of the Bering sea. My preliminary estimate is 13 years.
Thank you in advance.
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Lots of checks! I was going to go with 11 years old with your first image-- great to have Beth weigh in.  
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We found this during my colleague research survey on Seribu Islands, Indonesia. We found this only living on lagoon systems. We was thought this is kind of sponges, but we still not find the relevant publications. Can anyone help us for recommended publications or links? Many thanks, 
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Hi Singgih Afifa Putra
I'm sorry if this answer is too late. But i'm just replying for what it is worth. I am working in the Andaman Islands on sponges and I have frequently encountered the species seen in the first photograph and I believe it to be the species Lamellodysidea herbacea. I'm not sure if the following two images are of the same sponge. they look a little different.
I have also seen it to be growing on top of corals smothering and killing them. It is also generally more common toward the shallower reefs.
Best Regards
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I am conducting a survey which i will use as primary research for my extended project. 
If you can you may, State which of the following is the most destructive fishing practice. You may also give a reason why you choose that.
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Hi Alex. I fear that the answer depends on what you understand by "destructive" and what are you focusing at when assessing the effects: endangered species, community-wide effects, ecosystem services, or other.
Destructive can be translated into a number of attributes as being non-selective in the target, persistent in its effects, or effective in removing individuals. From this perspective, explosives and cyanide are the less selective and effective, while ghost fishing is the most persistent and less effective.
When one comes to focusing on response variables to assess the severity of the effects, shark finning remove top predators that are both important in structuring the community, can eventually lead to the alteration of ecosystem services (for example through releasing prey fishes and thereby altering the balance between coral-dominated and algae-dominated ecosystems) and generally endangered.
Still one can put the question in the perspective of wide-scale management for conservation purposes. Then other practices like bottom trawling (cited in the previous post) and also drifting nets would have higher impacts. The former because of its spatial extent and pervasive effects through communities and ecosystems. The second because its impact on charismatic species like dolphins, whales and turtles, which raise public concern and trigger in-the-field actions.
Possibly a multivariate approach in which you combine the scores given under different criteria for each activity, tailored for the societal values rooted in your study area, would provide a more complete albeit perhaps not definitive answer.
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The picture of this brittlestar is from the North West Atlantic at about 900 m. depth. The location is near the Greenlandic coast.
Can this Brittlestar be confirmed as an Ophiomusium lymani ? or could I be looking at something completely different
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Thank you for all your answers. I have something to work with now :-)
Helle
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I need to calculate LOD in Hg analysis of fish sample. My method is;
Blank: put 10 mL nitric in microwave vessels and run the program and volume up to 50 mL and read (result received in microgram/L)
Sample: take 1 g sample+10 mL nitric acid in microwave vessels, then run the program, 
My equation is for LOD=mean+ 3*standard deviation
But I receive blank reading in microgram/L unit (See attached excel sheet), then how I calculate LOD? Can you give the example or correct my excel sheet
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@Henrik
You are correct, assuming each sample is exactly 1.00g, and the volume is 50 mL.  Your calculation assumes that all 15 weight measurements are exactly 1 gram.  The spreadsheet should have separate columns for the weight extracted and volume used of each sample. 
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I will be increasing T by 2C every few days and need a heater that can do this accurately for a few gallons of seawater
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Tubular Immersion heaters are best option. It can be designed to based on Tank dimensions n with a suitable control System ( Panel). We make such heaters.
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Dear all,
I am looking for studies coupling experimental and demographic models simulating global change scenarios. For example, studies measuring the effect of temperature on the survival of individuals in controlled aquariums, and then incorporate that data in demographic models (such as matrix population models). I would prefer studies on the marine environment; however, given their scarcity I am also opened to terrestrial ones. 
Thank you all. 
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Thank you John!
That was definitely useful!
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i exposed mussels to different chemicals, same concentrations, different time of exposure, and i got the results for different organs, also i used DMSO as carrier for one chemical, could you please tell me which one is most suitable for mein, ANOVA one way or two way, beside of this i was confused about the effect of carrier how to normalize it (substraction or  ratio relative to control) or just see if the difference relative to control is significant or not? thanks in advance
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Dear Younes 
ANOVA IS GOOD FOR SUCH DATA 
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Dear researchers,
I’m evaluating marine species distributions off Northern Humboldt Current System (Peru). So, I wish calculate some overlapping index between them (e.g. Niche Overlap, Gotelli et al. 2015). To this, I need entries (values) in order to construct the matrixes. I have logistic outputs from MaxEnt (rasters and suitability values). How can I use these values? Need I some transformations? Thanks in advance for your helpful. Miguel.
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Thank you very much to all. I've used Dismo and SDMtools packages. NicheOverlap function (dismo) calculates an index proposed by Warren et al. (2008). But now, I'm going to try with ENMtools (Warren et al., 2010). Thanks again! Best regards.
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 Since early 2015, on Bonaire (Dutch Caribbean), I sometimes encounter 'humps' on scleractinian corals.
They feel like cartilage or a hard gel and have a diameter of about 10-20 mm. The surface has a whitish-violet colour, possibly due to fine filaments. In cross sections some concentric layers may be recognized.
These humps were encountered on healthy corals (Orbicella faveolata, Agaricia agaricites), on morbid corals (Orbicella annularis, Siderastrea siderea), on dead coral next to live coral (Madracis auretenra) and on dead coral surfaces (unspecified), see enclosed photos.
Who has seen these humps as well and who knows what they are?
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In Reunion, it seems we have the same whitish-violet "humps of Cyanophytes", Phormidium sp. Humps are ca 5 cm in diameter and they occur on corals in eutrophic/dystrophic areas (Naim et al., 2013a). They have a "stromatolit-like" internal structure.
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this cowrie was busily grazing on a reef flat located during the low tide. Would be happy if someone can identify the species. The spots are orangish and small on a white background. mantle has a dark brownish line on the periphery after which hairy structures are seen. 
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