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Behavioral response of Daphnia to rate of temperature change: Possible enhancement of vertical migration 1
Author(s) -
Gerritsen Jeroen
Publication year - 1982
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.1982.27.2.0254
Subject(s) - daphnia pulex , daphnia , daphnia magna , zooplankton , biology , sink (geography) , cladocera , diel vertical migration , branchiopoda , ecology , zoology , chemistry , cartography , organic chemistry , toxicity , geography
Daphnia magna, Daphnia pulex, Daphnia parvula, and Daphnia laevis respond to small temperature changes by changing the duration and frequency of upward swimming, in proportion to the rate of change of temperature. When temperature rises, animals swim up more frequently in direct proportion to the rate of change of temperature. In falling temperatures, the animals tend to sink. This response is opposite to previously reported reactions of zooplankton to heating or cooling. It may be adaptive in light‐initiated vertical migration by reinforcing upward swimming in ascending animals and by reinforcing sinking in descending animals.