Contemporary Problems of Ecology

, Volume 6, Issue 6, pp 656–661 | Cite as

Threshold concentrations of cations in environmentally determining the distribution borders of river crayfish (Astacus astacus L.) in fresh reservoirs

  • V. I. MartemyanovEmail author
  • A. S. Mavrin


The content of sodium, potassium, calcium, and magnesium in the hemolymph of river crayfish caught in nature is maintained at levels of 178.0 ± 2.5, 7.1 ± 0.5, 17.3 ± 0.7, and 3.0 ± 0.1 mmol/L, accordingly. It is shown that the threshold concentrations of sodium, potassium, calcium, and magnesium in water determining the distribution borders of river crayfish in fresh reservoirs is 0.0087–0.0174, 0.0046–0.0087, 0.0105–0.0222, and 0.0012–0.0033 mmol/L, accordingly. The reduction of water mineralization is accompanied by a significant increase in the gradients of the cation concentration between the organism and the environment, which is accompanied with a higher load on the maintenance of the water-salt exchange. A comparative analysis of the threshold concentrations of the above mentioned elements for river crayfish, roach, perch, goldfish, crucian, two species of two-folding mollusks, and Spirogyra filamentous alga is performed.


river crayfish threshold concentration sodium potassium calcium magnesium 


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© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  1. 1.Papanin Institute of Biology of Inland WatersRussian Academy of SciencesBorok, Nekouzskii raion, Yaroslavl oblastRussia

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