Inter- and intraspecific variation in body- and genome size in calanoid copepods from temperate and arctic waters

Overview
TitleInter- and intraspecific variation in body- and genome size in calanoid copepods from temperate and arctic waters
AuthorsLeinaas HP, Jalal M, Gabrielsen TM, Hessen DO
TypeJournal Article
Journal NameEcology and evolution
Volume6
Issue16
Year2016
Page(s)5585-95
CitationLeinaas HP, Jalal M, Gabrielsen TM, Hessen DO. Inter- and intraspecific variation in body- and genome size in calanoid copepods from temperate and arctic waters. Ecology and evolution. 2016 Aug; 6(16):5585-95.

Abstract

The tendency of ectotherms to get larger in the cold (Bergmann clines) has potentially great implications for individual performance and food web dynamics. The mechanistic drivers of this trend are not well understood, however. One fundamental question is to which extent variation in body size is attributed to variation in cell size, which again is related to genome size. In this study, we analyzed body and genome size in four species of marine calanoid copepods, Calanus finmarchicus, C. glacialis, C. hyperboreus and Paraeuchaeta norvegica, with populations from both south Norwegian fjords and the High Arctic. The Calanus species showed typical interspecific Bergmann clines, and we assessed whether they also displayed similar intraspecific variations-and if correlation between genome size and body size differed between species. There were considerable inter- as well as intraspecific variations in body size and genome size, with the northernmost populations having the largest values of both variables within each species. Positive intraspecific relationships suggest a functional link between body and genome size, although its adaptiveness has not been settled. Impact of additional drivers like phylogeny or specific adaptations, however, was suggested by striking divergences in body size - genome size ratios among species. Thus, C. glacialis and C. hyperboreus, had fairly similar genome size despite very different body size, while P. norvegica, of similar body size as C. hyperboreus, had the largest genome sizes ever recorded from copepods. The inter- and intraspecific latitudinal body size clines suggest that climate change may have major impact on body size composition of keystone species in marine planktonic food webs.

Properties
Additional details for this publication include:
Property NameValue
Publication ModelElectronic-eCollection
ISSN2045-7758
eISSN2045-7758
Publication Date2016 Aug
Journal AbbreviationEcol Evol
DOI10.1002/ece3.2302
Elocation10.1002/ece3.2302
LanguageEnglish
Language Abbreng
Publication TypeJournal Article
Journal CountryEngland
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PMID: PMID:27547339