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Temperature adaptation in a geographically widespread zooplankter, Daphnia magna
Author(s) -
Suzanne Mitchell,
Winfried Lampert
Publication year - 2000
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1046/j.1420-9101.2000.00193.x
Subject(s) - biology , daphnia , daphnia magna , diapause , adaptation (eye) , branchiopoda , cladocera , ecology , population , local adaptation , zoology , ectotherm , genetic variation , zooplankton , demography , genetics , gene , chemistry , organic chemistry , toxicity , neuroscience , sociology , larva
Evidence for temperature adaptation in Daphnia magna was inferred from variation in the shape of temperature reaction norms for somatic growth rate, a fitness‐related trait. Ex‐ephippial clones from eight populations across Europe were grown under standardized conditions after preacclimation at five temperatures (17–29 °C). Significant variation for grand mean growth rates occurred both within populations (among clones) and between populations. Genetic variation for reaction norm shape was found within populations, with temperature‐dependent trade‐offs in clone relative fitness. However, the population average responses to temperature were similar, following approximately parallel reaction norms. The among‐population variation is not evidence for temperature adaptation. Lack of temperature adaptation at the population level may be a feature of intermittent populations where environmentally terminated diapause can entrain the planktonic stage of the life‐history within a similar range of temperatures.