Is there any negative correlation between Ca and some cladoceran species like Ceriodaphnia, Alona, Simocephalus and Moina?

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Andrey V. Tyutin

Yes: if need see also - "Role of potassium and sodium balance in water for Simocephalus vetulus (O.F. Muller, 1776) (Crustacea, Cladocera) in small reservoirs of the Upper Volga River basin survival " Medyantseva E.N., Tyutin A.V. (in Russian)

Article Role of potassium and sodium balance in water for Simocephal...

John P Smol

We have been doing quite a lot of work on this topic. If you go to my lab's web page:

http://post.queensu.ca/~pearl/

and Click on publications (although not totally up to date) - there are several of those papers there. See papers especially with Adam Jeziorski as an author. See also our recent Proc Roy Soc Paper:

http://post.queensu.ca/~pearl/jellification/jellification.html

John Smol

Elena N. Medyantseva

There are optimal diapasons of the ion concentrations (as the population or species tolerance).