[Hypotonic regulation in marine cladocerans Evadne nordmanni and Podon leuckarti].
At a salinity of the environment of 23-25% (delta degrees being equal to -1.28 divided by-1.39), the depression of hemolymph in E. nordmanni is equal to -0.76 +/- -0.11 degree, in P. leuckarti - to -0.75+/- -0.06 degree. This high level of hypotony persists up to the formation of the head-shild, after which the depression of marsupium fluid becomes equal to that of the external medium. It is suggested that the head-shield is involved into osmoregulation. Similarity of the level of the osmotic pressure of the internal medium in marine cladocerans and marine teleosts which also originated from fresh-water ancestors is noted.
D000818:Animals; D003445:Crustacea / Q000378:metabolism*; D013045:Species Specificity; D014882:Water-Electrolyte Balance
Gipotonicheskaia reguliatsiia u morskikh vetvistousykh rakoobraznykh Evadne nordmanni i Podon leuckarti