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Lack of endogenous rhythmicity in Daphnia diel vertical migration
Author(s) -
Loose Carsten J.
Publication year - 1993
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.1993.38.8.1837
Subject(s) - diel vertical migration , water column , daphnia , kairomone , zooplankton , plankton , biology , population , daphnia galeata , fish <actinopterygii> , oceanography , environmental science , ecology , predation , fishery , cladocera , geology , branchiopoda , demography , sociology
A population of Daphnia Galeata × hy alina was induced to perform diel vertical migration (DVM) by the addition of fish‐kairomones to a large plankton tower. Vertical profiles of zooplankton abundance were measured every 12 h. When the tower was covered to shield the water column from the light, DVM ceased, and vertical distributions were not statistically different from the night profiles that had been observed before the tank was covered. This result suggests that endogenous rhythms do not trigger DVM, but that a change in light intensity must occur.