Questions related to Estuaries
Aquatic ecosystems such as freshwater, estuaries, and ocean waters have all been shown to contain microplastics. The consumption of food sourced from these habitats by humans is also put at risk by the presence of microplastic in aquatic systems, which also endangers aquatic creatures. There are several methods/strategies for removing microplastic from water sources across the world, including microbial degradation, thermal treatment, and physical approaches including adsorption and filtration. Which procedures/strategies are most efficient for removing microplastic from aquatic environments?
I would like to calculate the salinity from CTD profiles conductivity (µS/cm) readings in an estuary costal water? The water temperature range is between 1.86 and 5.93 °C.
I am working on fish ecology in an Indian estuary. However, proper identification of species belonging to Mugilidae is very difficult particularly of the genus Mugil and Liza. Most of the references available (FAO identification sheets and some Indian keys) differentiate the species based on the premaxillae shape which is difficult to ascertain in juveniles of the family. Also the family is highly dynamic with many new or updated genus and species. So, are there any recent comprehensive taxonomic keys available for the family from the Eastern or Western Indian Ocean regions?
In previous literature, WTP values have been estimated using Discrete Choice Experiments (DCE) capturing spatial heterogeneity mostly relating to direction, location (e.g. water quality across upper vs lower river basins), rural vs urban areas, agriculture vs forest areas, different disimilar alternatives (e.g. mud flates, beaches & estuaries of a river delta), etc. However, Time-scale validity has never been checked to assess whether preferences and WTP values remain similar over time, say few years. Knowing that population structure and trends change over time, checking Time-scale valudity is very important, if not; the reliability of benefit-transfer will be then questioable when the related development project is complete after some time period, say few years.
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Rapid industrialization, unplanned urbanization, deforestation for aquaculture and tourism in coastal areas and change in land use pattern have raised carbon dioxide level in the atmosphere, which on mixing with the coastal and estuarine waters shift the pH value left to the normal value of the aquatic phase. It is now well established that the average pH of the world ocean surface waters has already fallen by about 0.1 units from an average value of about 8.21 to 8.10 since the beginning of the industrial revolution. Many Indian estuaries today exhibit an aquatic pH of 7.9–8.0 compared to the value around 8.3 in early eighties. This has altered the biodiversity spectrum of the estuarine ecosystem particularly the shelled organisms in terms of their community structure, morphology and behavior
I need to do an environmental quality study to determine the effect of shrimp farms in estuaries with mangroves ( 4 sectors with different proportions betwen shrimp farms and mangroves) . Which criteria or protocole I must to use for to diseminate sampling sites for to collect water, sediments and bentos in every sector.
Thanks for your cooperation.
I have data on two estuaries and I am trying to determine how changes to freshwater discharge impact the fish communities of these estuaries on an annual basis.
the data I'm working with includes average discharge levels and CPUE for fish species.
I planned to use PRIMER V7 for the community analysis, utilizing PERMANOVA and MDS to start.
My first thoughts were to break my discharge data into categories of high, medium, and low and use this as a factor for PEROMANOVA and MDS. However, I am not sure of the best approach for breaking this up. Can anyone recommend a method for this? Or is there a way to avoid categories and just use the continuous data for discharge?
Can any suggest another method for analysis to test for effects of river discharge?
I am currently trying to understand the mixing behavior of major elements by observing the deviation from mixing line as done in several studies (few references are mentioned below). Dilution line should vary for different seasons as concentration in seawater and river water will change.
Patra, S., Liu, C.Q., Wang, F.S., Li, S.L. and Wang, B.L., 2012. Behavior of major and minor elements in a temperate river estuary to the coastal sea. International journal of Environmental Science and Technology, 9(4), pp.647-654.
Ramanathan, A.L., Vaithiyanathan, P., Subramanian, V. and Das, B.K., 1993. Geochemistry of the Cauvery estuary, east coast of India. Estuaries, 16(3), pp.459-474.
I am trying to decide on the best approach for statistical analyses of my data. I have never done this before and was wanting a second opinion.
I am studying the impacts of nitrogen pollution on the near-shore nekton communities. There are three different estuaries each divided in to three stations: an upper (impacted region), middle (less impacted region), and lower (less impacted region). The upper impacted regions tend to be dominated by macroalgae are are subjected to frequent anoxic events. The two lower sites generally are dominated by seagrass.
The the estuaries' station are going to be sampled twice: in 2020 (July and August, already completed) and again in 2021 (June, July, August) to account for temporal variation. Five seine net samples will be done at each station. Environmental data will be collected as well: temperature, salinity, dissolved oxygen, vegetation cover.
My main question is if the upper station's community differs from the lower two stations' communities. I am also interested in determining if the communities between estuaries differ, but this is not the main question. The response variable is the proportional abundances of species in the estuary. The ultimate goal would be to identify what species appear to drive this change.
If I look at each estuary individually I will have two factors: Station (Levels: 3 (upper, middle, lower); Factor effect: I think is fixed) and Month (Levels: 2 in 2020 (July, August), 3 in 2021 (June, July, August); Factor effect: fixed). I am wondering If I would consider the stations fixed, as I revisited the same spots? I think Month would be considered ordered, as July comes before august. Would I consider stations to be ordered? as they are in an order from upper to lower.
I am using PRIMER_e as the stats program. I looked over the data I have so far and I decided to standardize the data first so it proportional abundance per seine, then it seems that either 4th root or log transformation shows rare taxa the same so I went with Log transformed. I want rare taxa to be represented. I think a Bray -Curtis similarity matrix will suit my purposes, but several of the species are schooling fish, so we caught thousands in on seine but nothing in the next. I was wondering how best to deal with that?
I thought a two-factor crossed ANOSIM would be the best way of analyzing each estuary. But as I understand it ANOSIM can only tell you if a difference exists, nothing more, and PERMANOVA can tell you the magnitude of difference. I was wondering what anyone thinks which would be the better option for answer my question, or will it not matter that much?
I would really appreciate any feedback, I am just learning about multivariate statistics and I have so much to learn.
While comparing several biogeochemical parameters measured in different stations of the same estuary, or two different aquaculture ponds within the same wetland, reviewers have asked for carrying out repeated measures ANOVA instead of students t-test. I would like to know more about the applicability of repeated measures ANOVA, like when can it be applied? why is it better than students t-test (independent samples)? and most essentially when can we not consider this test?
Good Morning everyone,
We have conducted studies with microplastic (MP) contamination in different food web levels in an estuary. Now we would like to analyse which heavy metal and POPs which were adsorbed by
MP. In addition, we would like also to analyse the MP in relation to their chemical components. In this way, I ask you, if you know a laboratory which has an interest in realising these analyses.
Thank you very much for your attention,
With my very best regards,
Hi, everyone, here I have some question for you, in order to clarify the N2O production problem, I have done some work in four estuaries of China, focused on the abundance (DNA),activity (cDNA) and divesity of N2O releated groups using quantitive PCR and sequencing method, combined with biomarkers such as amoA(AOA/AOB),nirS/K and nosZ(I/II). however, when it comes to the explaination of the result , I found that biochemical physiology knowlege is important for understanding the reault and drawing a seasonable conclusion. so now I want to seek advice about how do you think about the relationship between oxygen and denitrification? how dose oxygen influence denitrification? on the distribution of gene or through transcriptional and metabolic regulation?
I have been looking for information on water column DO, pH, SST , Chl-a, POC for areas in the peninsula near the glaciers vs the Southern Shetland Inland with no luck. Any information available to look for the main differences? Mostly influence of freshwater inputs to the fjords at the peninsula.
I want to use the red mangrove roots foulers or epibionts (invertebrates and anemones principally) for to measure impacts of shrimp farming effluents in estuaries of the northern ecuadorian coast.
Anyone has field experience on eficiency of using this type of casting traps (image attached) versus more "traditional" pots ? If applied to the blue crab, would be optimal.
The idea would be to use these casting traps to cover a wider geographical area (also more replicates) on a much shorter time period. And avoid the trouble of going once to deploy the pots and having to go back one or two days later to retrieve them.
Any thoughts or knowledge on any study carryed-out with such casting traps would be well appreciated.
Greetings and Good day to all,
I am working through a project and was seeking information from anyone that has had experience using the South Florida Water Management DBHYDRO data platform.
Also if anyone has any information on comparison or analysis of salinities between wet_dry season and then how to graphically show the influence on natural salinity fluctuation/changes and then pinpoint where Freshwater inflow effect those level due to artificial actions like opening_closing levees.
My Gratitude and Thanks
My study is on diversity and abundance of brachyuran crabs in the inter-tidal region of tropical estuary.
I want to develop a ecological risk model for the measure and if were possible to predict the shrimp farming assessment in estuaries with mangroves in the north of Ecuador.
I have some ideas but I don´t about a basic protocole for ecological risk modelling.
Thanks in advanced
Eduardo Rebolledo Monsalve
For some time now I've been thinking about diadromous fish - that move between freshwater and estuarine habitats to complete critical lifecycle stages. I was snorkeling recently in freshwater (tropical river) and notice juvenile fish of a species I know are diadromous - but we've not yet had rainfall flow connection........ is it possible that diadromous fish can become adapt to reduced connect with downstream estuaries. Has anyone some data or comments?
The terrestrial organic matter injected into the sea through estuaries may be the important hydrocarbon generating parent material of natural gas in sea areas.
I am doing my thesis research on "Water quality parameters of a mangrove estuary". Spectrophotometry of nutrient parameters (Nitrite, Nitrate, Phosphate) showed negative concentration from few sampling stations.
What can be the reason behind these? How can I explain these findings?
I am a student studying phytoplankton pigment analysis by HPLC. We analyzed phytoplankton pigment of estuary. Of these, only the results of two seasons are difficult to understand.
1. Can fucoxanthin concentrations be 1.5-3 times higher than chlorophyll a in estuaries dominated by diatoms (Cheatoceros, Auracoseira spp. Etc. under microscope)?
2. If other pigments are too high, can chlorophyll a be over-measured on a fluorophotometer (10-au)?
3. Assuming a problem of analysis; Is it possible to reduce only chlorophyll-a without affecting other pigments during sample storage, extraction and analysis?
Studies from Indian coastal and estuarine waters show that heterotrophic dinoflagellates are negatively correlated with oxygen/ dominant in hypoxic water.
Wenlu Lana., Bangqin Huang., Minhan Dai., Xiuren Ning., Lingfeng Huang., Huasheng Hong. (2009). Dynamics of hetrotrophic dinoflagellates of the Pearl River Estuary. Northern South China Sea. Estuarine, Coastal and Shelf Science 85, 422–430.
Please answer this question.
CDOM is the colored dissolved organic matter. What makes the fresh water higher in CDOM concentrations than the ocean?
what is the appropriate sampling design for the caracterisation and the study of the spatial and temporal variability of coastal phytoplankton in a bay in response to hydroclimatic conditions? knowing that this is going to be the first study of this kind in this region In the absence of preliminary studies on the study area, I decided to opt for a systematic plan. what would you say? is it possible to work with a purposive sampling method, knowing that the bay has an estuary and is subject to an ocean current?
MSc Dissertation on the Feasibility of Power Generation from Pressure Retarded Osmosis.
Bi product/discharge is diluted seawater. I am trying to understand the environmental impact of salinity variations as a result of discharging high volumes of diluted seawater back into the sea either directly or via an estuary.
Climate change continues to drive up water temperature and the risk is that aquatic species will need to deal with this in some way (either move away, adapt to regulate the new conditions, or die). Has anyone published data on how coastal aquatic species (flora or fauna) will deal with climate change and higher water temperatures ?
Glass eels collected from estuaries are usually composed of a mixture of A.pacifica bicolor and A. marmorata. Though the method of segregating these species by microscopy and by DNA analyses exist. However these methods lack applicability in segregating large amount of elvers for nursery or grow-out purposes. Microscopy and DNA analyses are no longer applicable when separating 10-100 Kg of glass eels (around 10,000 pcs /kg).
I would like to ask if a practical method exists to separate the species of glass eels (visually, or other ways)??? Or pigmented elvers 3-6 cm in size???
I have an amphipod that is evading identification. I think it belongs to the family Oedicerotidae, particularly in the genera Synchelidium or Pontocrates.
I have come to this conclusion as it has a subchelate gnathopod (G)1, a chelate G2 and a distinct rostrum. Photographs of the specimen are attached.
However, the crux is that neither genus is recorded in Australian waters. I have Lincoln's British Marine Amphipoda: Gammaridea and it does appear to match the description of these genera but it exhibits a mix of the feature that separates between them, i.e. the palm of G1 is half toothed and half smooth.
I have attached scans of the genera descriptions for your interest(extracted from Lincoln's book).
Anyone have any ideas? Could we have a new amphipod in Australia?
Samples collected from the Peel Harvey Estuary, Western Australia (temperate waters).
All the best,
I have an estuary having 5 rivers as its inlet and 3 outlet connected to sea. I wanted to water balance of estuary and how it is changing with drastic change in surrounding landuse/land cover change. Is there any model that computes water balance of estuary?
Am looking for time and resource efficient method to quantify nitrogen (ammonium and nitrate OR total) and/ available N.
Getting a method using spectrophotometer would be nice. Many thanks!
I am Prof. N. Rajeshwara Rao from the Department of Applied Geology, University of Madras. I have been working on Foraminifera from diverse ecosystems such as the littoral zone, inner shelf, continental slope, deep-sea, mangroves, coral reefs, backwaters and estuaries for the last 30 years. Currently, my team is working on forams from a seamount in the Arabian Sea (water depth of ~520 m). I'm interested in working on forams from the core you have documented. Please let me know if you are willing to have a collaboration with me.
I would like to know the best option for coupled catchment-ocean hydrological model to apply under climate change at the Sydney estuary to assess estuarine dynamics.
In laboratory incubation experiments, how to set the ratio of overlying water and sediment (6:1 in some lakes, but estuary )? And the size of incubation Plexiglass column?
I am a bit confused about the terminology used for Sunderban (in West Bengal, India). Is it a delta or estuarine settings.
Or I would say, Sunderban is a complex system of the delta which consists of tidal rivers, estuaries, mangrove forests and creeks.
I took hydrological measurements (pH, salinity, dissolved oxygen, temperature) in an estuary, a coastal lagoon, and the salinity increased in winter season. On the other hand, higher temperatures were registered during rainy season but the salinity were lesser than the winter period. What, in your experience and knowledge, do you think this is due to? given that higher temperatures has a direct correlation to high salinity values.
On the littoral of an estuary area of the Murman coast (the Barents Sea) we have revealed the increase in salinity within intertidal pools during the low tide for 2003 -2015. Bottom fauna and algae are affected by this salinity increase.
I was wondering if anyone knew of early Cretaceous crocodillian taxa that have teeth that are typically conical in shape but the carina bares very fine serrations.
Some teeth are large, the largest is 35 mm tall, 15 mm labiolingually, 10 mm mesiodistally. The crown is typically long, narrow, and with a slight curvature directed lingually.
There are faint longitudinal labiolingual striations that barely make it to the tip and are evenly spaced.
The geologic location is the Maryland Arundel Clay, Early Cretaceous (Aptian-Albian), considered freshwater channel to oxbox lake deposition, though not far from a estuary.
Thank you for your time and I hope to hear from the community.
I want to measure the DIC(Dissolve inorganic carbon) DOC(Dissolved organic carbon) in estuaries. what is procedure? suggest any reference book.
I am exhaustively looking for a reference that explains how to identify dry and rainy months through precipitation values. What is the threshold?
Thanks in advance.
Today 25-01-2018 we documented more than a lakhs no of Faunus ater (Linnaeus, 1758) were seen in small estuary. Watch this link https://www.youtube.com/watch?v=p7BA1OvrN-k&feature=share .
This species are any indicator of usual.
I am interested in published papers examining trends in relation to environmental variables, or just datasets that have not been published. Of particular interest is Hypomesus nipponensis, but information on any species would be great. Thanks in advance.
I have a geochemical data from the estuarine sediments. I would like to calculate the pollution and accumulation index of the samples. But I am a bit confused about which background value (UCC or PAAS) should I use.
I am studying rate of sedimentation in ports and seawater body. I need information about chemical and nano methods for decreasing sedimentation rate or avoid of suspended sediments sinking in sea water body such as ports. pleas help
thanks a lot.
The watershed management practice is trapping the water along with the sediments, which used to be transferred to the estuary region. These sediments in turn transported to the coasts, the food for that landscape !
I got this species from dolnet catch at bhayander estuary,Maharashtra.this species doesn't had dorsal fin,looking more like scatophagus argus.
I am looking for real cases of esturies where sediment material from beaches in their vicinity is trapped. As a result, coastal structures like groynes or ports near such estuaries may possibly suffer from erosion problems as well.
I am searching references and papers about the negative relationship of TOC and DIC in coastal ecosystems (estuaries, lagoons, etc). In general, I just found positive relations. Can anyone indicate please something about this thematic?
We wish to perform a large-scale screening assessment of a large number of sites, to build a semi-quantitative 'map' of sediment condition throughout a large (130 km2) estuary.
Ideally this will be very rapid and low cost, involving little to no laboratory analysis.
This broad-scale assessment would allow us to identify a range of sites from 'best available' to 'worst' sediment condition, for subsequent targeted field sampling of sediment parameters and benthic macroinvertebrate fauna.
Many thanks for any suggestions you may be able to provide.
I'm trying to run a mixed model of nested permanova with adonis function in R. I'm not sure how to write the factors so R understand which are fixed factors and which are nested factors.
I want to test diferences between: estuaries (fixed, 2 levels), points (random, 4 levels, nested in estuaries), depht (random, 2 levels, nested in points), season (fixed, 4 levels and orthogonal to estuaries), and month (18 levels, random, nested in season)
Some one can help me?
Hi. I am working on avifaunal assemblage of an estuary and I have 3 seasons data across 5 different habitat types. I used nmds ordination to look for any gradient in the assemblage across the habitats but in both 2-D and 3-D ordinations my stress values were high, almost equal to 0.3.
In such a case, reducing the number of species (using the most abundant species) would lead to a better ordination of the habitats or do I need to transform the abundances of all species before computing the dissimilarity matrix? I tried the second option using fourth root transformation, still the stress was higher than the non-transformed data. Or do I need to use a different ordination technique or a different dissimilarity matrix (I used Bray-Curtis)? If so please give some suggestions. (I use PAST and R for my analysis).
I am using the SWAN wave model to hindcast waves in an estuary. I have an offshore boundary condition containing some swell energy. I output the energy spectrum in my fine resolution domain but the swell energy does not show up anywhere in the time series. The energy spectrum seems to be shifted toward higher resolution when comparing to field measurements.
We are trying to estimate the biomass of adult snook in Brazilian estuaries where underwater visual census methods cannot be used. A method using gillnets perhaps? Thank you.
We have found methods mostly for juvenile fish, such as those listed in Rozas and Minello 1997 (Estimating Densities of Small Fishes and Decapod Crustaceans in Shallow Estuarine Habitats: A Review of Sampling Design With Focus on Gear Selection. Estuaries Vol. 20, No. 1, p. 199-213 March 1997). However any method for young adults or adults in mangrove estuaries will be most welcomed. Thank you.
Is the Moynapara tidal creek (as Das, Gautam K, has mentioned in the article called "Holocene tidal flat sedimentation in the Sunderban Biosphere Reserve, NE India" published in Coastal Zone Management journal, spl. publication, vol.2 in 2000) same as the Kalnagini Khal (as mentioned in the topographical sheet published in 1972 by SOI)?