Aquatic Ecosystems

Aquatic Ecosystems

  • Gour Gopal Satpati added an answer:
    Can someone list three phytoplankton species that can not live in salinity level higher than 1 ppt?
    Can you provide references too?
    Gour Gopal Satpati · University of Calcutta
    Dear Sama
    Some desmids can not tolerate high salinity viz. Cosmarium, Staurastrum, Euastrum etc. they are pure fresh water planktons.
  • Helmut Brandl added an answer:
    What is the ecology of diseases in the ocean?
    Can you help by pointing me to any journals describing the ecology of diseases in the marine environment? What are the major concepts?
    Helmut Brandl · University of Zurich
    There is a nice tool available: JANE (Journal / Author Name Estimator); see . You can upload an abstract or enter keywords to obtain a list of relevant journals related to your entry.
  • Can anyone identify this wetland plant please?
    Found in Kenya/East Africa.
    Edward Howard James Morrison · University of Leicester
    Hi all,

    Many thanks indeed for the generous responses and my sincere apologies for the hideous delay in my acknowledging them; I have to admit I'd entirely forgotten I'd posted the picture and request on RG.

    I believe it is indeed M. aquaticum and am very grateful for your contributions and insights!


  • Udaya Bhanu added an answer:
    In a pond the dissolved oxygen has been found to be 15 mg/l, why?
    Udaya Bhanu · CSIR-Central Electrochemcial Research Institute, Karaikkudi
    Naturally... It has naturally growing algae n micro-algae. Besides its benthic zone is so shallow that Oxygen dissolution from the atmosphere is more (per L of water) compared to deeper benthic areas.. Ofcourse there are a lot of biogenic chemical mechanisms which need some investigation.
  • Joseph Stachelek added an answer:
    In an Aquatic system: how to calculate salinity budget? and what is the better way to estimate salt concentration due to evaporation?
    I tried to use the box model to estimate the salt budget of Iraqi marshes, which explained by the equation concentration of salt input - concentration of salt yield (plus/minus) changes in ground water recharge/discharge. I did the calculation for 10 months period but I think there is a missing content to this equation! Please check the attached file to have a better clue. Thanks in advance
    Joseph Stachelek · South Florida Water Management District
    Try this paper:

    Quantifying groundwater discharge through fringing wetlands to estuaries: Seasonal variability, methods comparison, and implications for wetland-estuary exchange
    Craig R. Tobias, Judson W. Harvey, Iris C. Anderson
    Limnology and oceanography 01/2001; 46(3):604-615.
  • Armin Rose added an answer:
    What kind of statistical tests I should do?
    I have monthly data on intertidal benthic fauna from the west coast of India over several seasons. I want to see the variations in abundance, diversity across monthly and seasonal scales. Can anyone suggest some statistical tests which I can utilize here apart from Dominance, Diversity indices, evenness etc.
    Armin Rose · Bio Consult SH
    If you have environmental data I would recommend a (detrended) canonical correspondence analysis ((D)CCA).
    You might also model single species or overall numbers by Generalised Additive Modeling (GAM) or other kinds of models, in order to get the factors that explain the distributional pattern in the most reasonable way. Do this with R (package mgcv).
  • Amit Kumar asked a question:
    Could anyone please explain to me preparation methods of Diphenylamine indicator (169.23 g/mol) with reference...???
    See above.
  • Ian C. Duggan added an answer:
    Can anyone identify this erosive barnacle?
    This is a family of pyrgomatidae
    Ian C. Duggan · The University of Waikato
    Enrico Savazzi: "Not likely that the key of Florida species will be useful": The key provided is to "genera", hosted by the Florida Museum. It contains 16 of the 22 genera globally. It is not a key of "Florida species". Also, there was no statement by Mohammad about where these samples were collected.
  • Shahram Dadgar added an answer:
    Sulfate (sulphate) toxicity on trout and other fish
    The literature on sulfate toxicity is very wide and lethal doses reported vary a lot. It is hard to determine which one is reliable.
    In particular, I have faced few times the situations in which in analyses of the surface water in our Laboratory we have to negatively comment on waters in which sulfate is slightly high (such as 100-200 mg/L). Otherwise, these waters are very clean and pure, almost suitable for drinking without treatment (mostly Bosnian non-polluted mountain rivers and lakes).
    The most recent situation is the fish pond which is being build on a very clean mountain river. There is nothing but the pure forest and the air rich in oxygen above the point where the pond is being built. However, sulfates have shown a value of 277 mg/L in the spring period during the snow melting.
    Our regulation show that for production of trout, value has to be below 75 mg/L.
    What are your experiences, does anybody have the recent literature on this subject?
    Shahram Dadgar · Iranian Fisheries Research Organization
    Dear Suzana,
    I'm sending a new article. Hope it would help you.
  • Karl Andrew Lamothe added an answer:
    Does anybody have any reference about the relationship between crustacean abundance and river affluents?
    I'm studying the abundance of some decapodes in and around river affluents
    Karl Andrew Lamothe · University of Toronto
    Garrett A. Brauer, William H. Neill, John J. Magnuson. 1974. Effects of a power plant on zooplankton distribution and abundance near plant's effluent. Water Research 8(7): 485-489.
  • Ranjith Eswaran added an answer:
    Does anyone have a protocol to isolate glucosidase producing marine bacteria?
    I need to isolate beta glucosidase producing bacteria from oceanic waters.
    Ranjith Eswaran · National Institute of Oceanography
    Dear Dr. Roger A Laine,
    Could please tell me what is the minimal conc of paranitrophenyl beta glycoside to be added in medium
  • Mohammad ali Jafari added an answer:
    Can anyone identify this colony?
    I think this is a colony of animal eggs.
    Mohammad ali Jafari · Tarbiat Modares University
    Yes, your Pinna attached to Stramonita eggs.
  • Mohammad ali Jafari added an answer:
    What is the difference between the dark and bright annual rings of coral?
    This is the same as on the trunks of trees.
    Mohammad ali Jafari · Tarbiat Modares University
    Thank you my friend.
  • Fikrat Hassan added an answer:
    Does anyone know of a paper discussing nutrient starvation in an ecosystem?
    I am looking for a paper which discusses the potential negative effects of extreme nutrient limitation. The majority of the literature focuses solely on enrichment or excessive loading of nutrients. While eutrophication can be harmful for ecosystems, I assume that nutrient starvation could also be bad, unless it is an adapted ultra oligotrophic system. Just wondering if anyone has stumbled upon any papers.
    Fikrat Hassan · University of Baghdad
    Dear Julian,
    You can look for F. P. Healey manuscripts about nutrient limitation; he discussed all status of limitation. Also Maestrini et al. 1999 and Rothhaupt 1995 will be useful.
  • Vinod Gour asked a question:
    Can anybody suggest me a journal for publication of "characterization of herbal detergent" It is very first report with 15 characters.
    Green chemistry
  • Mohammad ali Jafari added an answer:
    Has anyone fully worked with CPCe (Coral Point Count with excel extensions) software?
    I've worked with this software so much, but I want to learn it more.
    Mohammad ali Jafari · Tarbiat Modares University
    Thank you so much dear Rui.
  • Golam Kibria added an answer:
    Will climate change increase the water quality problem across the globe?
    Water is the most precious resource on earth. It is vital for all living organisms, human consumption, food production (agriculture, livestock, fisheries and aquaculture) and economic development, industries, in hydroelectric power generation, firefighting, transportation, and healthy functioning of nature. Water is also required for many recreational activities including fishing and swimming. The agriculture sector is by far the biggest user of freshwater (more than 70% of water usages). I am writing a review paper; therefore your cooperation is sought.

    Question: Will climate change (rise of temperature, carbon dioxide, floods, droughts, and sea-level) increase threats to global water quality?If so, will it (climate change) cause disproportionate impacts between developing and developed countries, between freshwater and marine environments, and between the poor and the rich?
    Golam Kibria · RMIT University
    Thanks Michael, Atul, Raoof, David, Inga, Ronald, Saif for your valuable inputs

    Summary: From your inputs, I can summarize that climate change will impact on WQ via nutrient load, algal blooms, low DO, toxins inputs, sewerage overflow, suspended solids, sediment and metal influx, ocean acidification, salinization of sweet water and groundwater. Major disasters like Katrina, USA (2005) and Floods in Pakistan (2010) may cause significant pollutant inputs including microbial pathogens, thus on WQ. It appears that in marine/coastal areas, ocean acidification, and salinization of aquifers whereas in inland areas nutrient inputs, algal blooms and chemical/toxin inputs may dominate
  • Can anyone help with the measurement of water pollution?
    I´m planing to start an experiment for my PhD but this kind of measurement is not my specialty, so I´m not sure how to have an accurate idea about the water pollution in some rivers.
    José Juan Carbajal Hernández · National Polytechnic Institute
    Hi Armando:

    Please check the following papers, where water quality is assessed using different methodologies:

    if you need more help please contact me; environmental measuring is my expertise area.

    Best regards!

    José Juan.
  • Could climate change ever “wipe us out”?
    Regional temperature fluctuations have contributed to the deaths of millions of people and the demise of civilizations, as in the cases of the Irish Potato Famine and the Vikings’ departure from Greenland.
    Saravanamuttu Subramaniam Sivakumar · University of Jaffna
    The below article will also useful in this discussion
  • Tahir Atici added an answer:
    Can anyone help me to identify the symbiotic filamentous algae with sargassum horneri? (Picture Attached)
    The symbiotic algae lives on the young thallus of sargassum horneri. And it is brownish or reddish. Attached pic is the image under light MS. it is really difficult to remove this species from the young thallus of sargassum horneri. This species can also inhibit the growth of young S. horneri.
    Tahir Atici · Gazi University
    I think this is a Hapalosiphon Nägeli ex Bornet & Flahault which is a Cyanophyceae O. Nostocales. But I not say to you ıt's species need some datas.. regards.
  • Lynda Weekes added an answer:
    Is there a phytosociological classification system/literature where I can find alliances/associations listed that are based on aquatic bryophytes?
    I am classifying small streams/headwaters vegetation that are dominated by bryophytes, very often without vascular plants present.
    Lynda Weekes · University College Dublin
    Thank you Andrii, I also have those literature sources which are very helpful.
  • Golam Kibria added an answer:
    What is the impact of climate change on marine ecosystem?
    Golam Kibria · RMIT University
    There are two main impacts on marine ecosystems from climate change: (a) rise of sea surface temperature; and (b) ocean acidification (due to CO2). Both (a) and (b) will impact on marine life. For example, increased in sea surface temperature caused a shift in distribution of fishes toward poles. Warming will likely affect the successful recruitment of marine organisms. In addition, warming may cause more toxic algal blooms (dinoflagellates and diatoms). Dinoflagellates and diatoms produce toxins which can then be accumulated in seafood organisms via the food chain pathways. Calcifying organisms (e.g. pteropods, corals, and molluscs) would be more vulnerable to changes in ocean acidification.
  • Saif Uddin added an answer:
    Water from oil: can we help restore Iraq's marshes?
    Collapse of the marsh ecosystems of southern Iraq after 1991 forced hundreds of thousands of people into urban slums, and led to contamination of the remaining water supply. We will establish three test beds to see whether brackish water returned from oil drilling and refining can be used to construct new salt marshes. These will filter water, provide forage for livestock, create habitat for fish nurseries, and give new economic opportunities.
    Saif Uddin · Kuwait Institute for Scientific Research
    Good to hear that you are very close to your goal. I will like to offer all the analytical support if required from our Lab in Kuwait. Let me know if I can be of any help.
  • S. J. Dalton added an answer:
    When am using a 1mx1m quadrat in larger reef area (hectares,say 1200ha) to determine coral cover,what is the optimum number of quadrats I should use?
    Say I divide the area into 12 samples of 1 hectares each,then how many quadrats do I put to get the a better representation of coral cover?
    S. J. Dalton · Southern Cross University
    I also agree with Morgan and do favour transects over quadrats to estimate assemblage cover, but 1m * 1m photo quadrats do have their advantages over video transects as well. Still images are now high resolution and it is far easier to species level with greater confidence using stills images than using video footage. New methods are using repeated photographic still images (2 shots per second) along transects, which can be analysed by free software such as CPCe or Squidle that is available online at

    I have compared both video and still quadrat methods and have found utility in both methods for assessing different assemblages, but find still images better for quantifying assemblage to coral species level in less complex environments. In order to overcome increased variance, you can use a statified random sampling technique to assign your points onto your images, this eliminates some clustering of the point onto the image.

    I agree with the above and you should complete a pilot study which should assess the area in your study region that has the greatest heterogeneity to determine survey design and sample methods via power analysis.

    Good luck with your studies.
  • Siva Subramanian added an answer:
    Can anyone help me to identify the attached microalga?
    It was isolated from hypersaline water and it is motile.
    Siva Subramanian · Phycospectrum Environmental Research Centre
    Must be Carteria
  • Carlos Iñiguez - Armijos asked a question:
    Does anyone know an online site specific for freshwater biota data deposition?
    I would like to upload my macroinvertebrate data at any publicly available resources and it would be better if it is specialized in dealing with freshwater life.
  • Vaithianathan Kannan added an answer:
    How we can save this tropical lagoon (the Ono lagoon from Côte d'Ivoire in West Africa) covered by macrophytes?
    Macrophytes are among the most productive plant communities in the world and are known to provide nutrition for humans and herbivorous animals. In general, these plants have both positive and negative importance to man. In Côte d’Ivoire, they considerably alter aquatic ecosystem functions. Moreover, they seem to increase greenhouse gas emissions toward the atmosphere. So, we need mechanisms that could help to remove these plants.
    Vaithianathan Kannan · A.V.C. College (Autonomous)
    A wetland in southern India the size is 300 - just to share since I also work on this aspect in biological control of invasive species
  • Is there a particular technique to estimate the area of littoral zone in a given section of a lake/river?
    I am trying to assess the contribution of benthic communities to the whole system metabolism (oxygen signal) measured through the dissolved oxygen loggers, within 100 m length of a creek for which I would like to get an estimate of the littoral zone, to scale up the contribution per square meter to the whole littoral zone. Is there a particular technique to estimate the area of littoral zone within a specified section of creek/lake/river?
    Leonardo Alvarez Santamaria · Autonomous University of Baja California Sur
    First you need depth data points of the area you are to work with, because it is not the same a planar area than a surface area, so the surface area will be bigget than the planar one (and because of that your results may vary). You may use a GIS or SURFER to calculate the surface area and also the volume. If you have some insight about the shapes of the bottom forms you may pick the TIN´s (triangular irregular network) to build the bathymetry or the Kriging method, which is a regular mesh, both are good choices.
  • Habib Ayadi added an answer:
    What are your thoughts on using Large Fish Index as an ecosystem health indicator characterizing the food web ?
    Your answers will be usefull in the discussions on finding common indicators in Europe for monitoring food web health in marine ecosystems. LFI is for example monitored within OSPAR as the percentage of fish > 40 cm when performing a bottom trawl. The idea beyond is that food webs are shortened by overfishing. What do you think of it as an indicator not only of the fish community but also of the whole food web. Is this indicator sensitive to other pressures than fishing ? How could this indicator be modified for a better food web use ? Would it make sense to apply it to benthic species and especially invertebrates ?
    Habib Ayadi · University of Sfax
    Hello dear
    can iyou send me this paper ?
    best wishes
  • Rodrigo Ponce de León added an answer:
    Is this fauna or flora?
    Taken from intertidal region of South west coast of Tamil Nadu, India. Size about 2 mm. I want to know its generic and specific name.
    Rodrigo Ponce de León · University of the Republic, Uruguay
    I agree with Tom, but the right end looks as a kind of seed... Please, upload more information and pics!

About Aquatic Ecosystems

marine and freshwater aquatic ecology and hydrobiology

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