I found negative correlation between these cladocerans and Ca concentration
We have not performed a correlation analysis, but in the lakes with high concentrations of CaCO3 in the water and sediments there are really is not Cladocera which you enumerated. In such reservoirs dominated as a rule Bosmina and Chydorus
Of course correlation does not necessarily mean, that there is a cause-efect relationship. Highr Ca may indicate higher porductivity - more fish.
Anyhow, Interesting observation!
kind regards
Irene
Dear Montaser,
I agree with both followers. correlation means nothing – just coincident. Control, please, pH, as it influences the CO2 dynamic, and it is produced in ecosystem in total by photosynthetic activity of algae.
Best wishes from Uzhgorod (Ukraine) – Zakarpattia!
Just found in article may be useful for you information
Šporka F., Krno I. Benthic Invertebrates and Metabolism of West Carpathian (Slovakia) Rivers // Internat. Rev. Hydrobiol. – 2003. – V. 88, No 3–4. – P. 274–283.
Abstract
We examined benthic invertebrates and metabolism on the basis of the annual sampling of 9 types of running waters in the West Carpathians. Headwaters in general represent typical heterotrophic systems, except where they are high mountain streams, which are autotrophic. Lower down, the upper reaches of brooks are transition zones between heterotrophic and autotrophic systems. After the transition to an autotrophic system (which depends mainly on the primary producers) there is a considerable decrease in secondary production. Production is higher in the rivers of the Carpathian basin, as well as lower down the valley (submontane rivers and lower tributaries of submontane streams) where, within the autotrophic systems, there is a shift of metabolism from the bottom to the water column. The temperature days, altitude and slope of the stream and concentration of calcium influence production of macrozoobenthos.
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