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Phenotypic variability of lactate dehydrogenase inDaphnia magna

✍ Scribed by Hebert, Paul D. N.

Publisher: John Wiley and Sons
Year: 1973
Tongue: English
Weight: 455 KB
Volume: 186
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1401860106

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✦ Synopsis

Abstract

Three zones of L( + ) lactate dehydrogenase (LDH) activity are apparent after electrophoresis of extracts prepared from well fed individuals of Daphnia magna. Phenotypes of individuals subjected to brief starvation are characterized by additional bands below each of the original zones of activity, while prolonged starvation results in the total disappearance of LDH activity in two of the three zones.

Proteolysis of pre‐existing LDH molecules is responsible for the appearance of the more anodally migrating components after brief starvation, but the cause of the phenotypic changes after prolonged starvation is uncertain.

The possibility of the using LDH phenotypes to monitor changes in food availability within natural populations of D. magna is discussed.

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