I've recently (May, 2017) found moderate levels of Cladophora, Oscillatoria, and Lyngbia in a 2nd order, softwater, coldwater stream in northwestern New Jersey (USA). A concern has been expressed that presence of these algae may be evidence that nutrient polluted seepage from a septic system is entering the stream. I'm not so sure. I know that high biomass of Cladophora in the Great Lakes has been considered an indicator of nutrient pollution, and cyanobacteria are also often considered indicators of nutrient pollution. But I suspect that low to moderate levels of these algae occur naturally without any pollution, but I'm not sure.
Dear Dr Evans,
That's an interesting question. I have also got the similar question in mind. While we refer the papers related to bioindicators, most of the authors (even, i) have mentioned that the presence of a particular phytoplankton for eg: say, Scenedesmus or Euglena or Ocscillatoria indicates organic pollution in water. Because they survive in such condition. But to the extent to which is still a question. If there is any ...?
Will wait for the expert answers..
Greetings from Kerala-India
sincerely
Anila P Ajayan
Anila,
Thanks for your response. Unfortunately no one else has responded, so no expert answers. Maybe if I ask a slightly different question, or rephrase this one, I'll get more response and some answers. But I'm not sure what to ask yet.
Richard
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