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Influences of light regime on postembryonic development in two strains of Daphnia pulex 1
Author(s) -
Starkweather Peter L.
Publication year - 1976
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1976.21.6.0830
Subject(s) - darkness , daphnia pulex , daphnia , biology , instar , phototaxis , strain (injury) , cladocera , zoology , crustacean , ecology , botany , larva , anatomy
Two strains of Daphnia pulex were used to assess the influence of continuous illumination, darkness, and light‐dark cycles on the developmental rate of preadult animals. In one strain, animals reared in continuous illumination or darkness developed more slowly than siblings held under a photocycle. Animals in 24‐h photocycles developed at the same rate, irrespective of the relative length of the light and dark periods. The effects were probably independent of nutritional differences. Animals of the second strain developed at comparable rates in both photocycle and continuous light regimes, but differed in primaparous instar timing between the treatments.