Adaptive phenotypic plasticity and local adaptation for temperature tolerance in freshwater zooplankton
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 2297385
Author(s) Yampolsky, Lev Y.; Schaer, Tobias M. M.; Ebert, Dieter
Author(s) at UniBasel Ebert, Dieter
Year 2014
Title Adaptive phenotypic plasticity and local adaptation for temperature tolerance in freshwater zooplankton
Journal Proceedings of the Royal Society. Series B, Biological Sciences
Volume 281
Number 1776
Pages / Article-Number 20132744
Keywords Daphnia, temperature, heat tolerance, phenotypic plasticity, local adaptation, haemoglobin
Abstract Many organisms have geographical distributions extending from the tropics to near polar regions or can experience up to 30°C temperature variation within the lifespan of an individual. Two forms of evolutionary adaptation to such wide ranges in ambient temperatures are frequently discussed: local adaptation and phenotypic plasticity. The freshwater planktonic crustacean Daphnia magna, whose range extends from South Africa to near arctic sites, shows strong phenotypic and genotypic variation in response to temperature. In this study, we use D. magna clones from 22 populations (one clone per population) ranging from latitude 0° (Kenya) to 66° North (White Sea) to explore the contributions of phenotypic plasticity and local adaptation to high temperature tolerance. Temperature tolerance was studied as knockout time (time until immobilization, Timm) at 37°C in clones acclimatized to either 20°C or 28°C. Acclimatization to 28°C strongly increased Timm, testifying to adaptive phenotypic plasticity. At the same time, Timm significantly correlated with average high temperature at the clones' sites of origin, suggesting local adaptation. As earlier studies have found that haemoglobin expression contributes to temperature tolerance, we also quantified haemoglobin concentration in experimental animals and found that both acclimatization temperature (AccT) and temperature at the site of origin are positively correlated with haemoglobin concentration. Furthermore, Daphnia from warmer climates upregulate haemoglobin much more strongly in response to AccT, suggesting local adaptation for plasticity in haemoglobin expression. Our results show that both local adaptation and phenotypic plasticity contribute to temperature tolerance, and elucidate a possible role of haemoglobin in mediating these effects that differs along a cold-warm gradient.
Publisher The Royal Society
ISSN/ISBN 0962-8452 ; 1471-2954
Full Text on edoc Restricted
Digital Object Identifier DOI 10.1098/rspb.2013.2744
PubMed ID
ISI-Number WOS:000332381500020
Document type (ISI) Journal Article

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