Geographic and seasonal patterns and limits on the adaptive response to temperature of European <Emphasis Type="Italic">Mytilus</Emphasis> spp. and <Emphasis Type="Italic">Macoma balthica</Emphasis> populations |
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Authors: | Jeroen M Jansen Annelies E Pronker Sandra Kube Adam Sokolowski J Carlos Sola Mikel A Marquiegui Doris Schiedek Sjoerd Wendelaar Bonga Maciej Wolowicz Herman Hummel |
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Institution: | (1) Wageningen IMARES, Korringaweg 5, PO Box 77, 4400 AB Yerseke, The Netherlands;(2) Netherlands Institute of Ecology (NIOO), Korringaweg 7, PO Box 140, 4400 AC Yerseke, The Netherlands;(3) Baltic Sea Research Institute Warnemuende, Seestrasse 15, 18119 Rostock, Germany;(4) University of Gdansk, Institute of Oceanograpgy, Al. Pilsudskiego 46, 81-378 Gdynia, Poland;(5) Facultad de Filosofía y Ciencias de la Educación, Universidad del País Vasco, 20009 Donostia-San Sebastián, Spain;(6) Sociedad Cultural INSUB, Zemoria 12, 20013 Donostia-San Sebastián, Spain;(7) Faculty of Science, Insititute IWWR, Radbout University (RU), Toernooiveld 1, PO Box 9010, 6500 GL Nijmegen, The Netherlands |
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Abstract: | Seasonal variations in seawater temperature require extensive metabolic acclimatization in cold-blooded organisms inhabiting
the coastal waters of Europe. Given the energetic costs of acclimatization, differences in adaptive capacity to climatic conditions
are to be expected among distinct populations of species that are distributed over a wide geographic range. We studied seasonal
variations in the metabolic adjustments of two very common bivalve taxa at European scale. To this end we sampled 16 populations
of Mytilus spp. and 10 Macoma balthica populations distributed from 39° to 69°N. The results from this large-scale comprehensive comparison demonstrated seasonal
cycles in metabolic rates which were maximized during winter and springtime, and often reduced in the summer and autumn. Studying
the sensitivity of metabolic rates to thermal variations, we found that a broad range of Q
10 values occurred under relatively cold conditions. As habitat temperatures increased the range of Q
10 narrowed, reaching a bottleneck in southern marginal populations during summer. For Mytilus spp., genetic-group-specific clines and limits on Q
10 values were observed at temperatures corresponding to the maximum climatic conditions these geographic populations presently
experience. Such specific limitations indicate differential thermal adaptation among these divergent groups. They may explain
currently observed migrations in mussel distributions and invasions. Our results provide a practical framework for the thermal
ecophysiology of bivalves, the assessment of environmental changes due to climate change and its impact on (and consequences
for) aquaculture.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Climate change Respiration rate Thermal tolerance Distribution range Metabolic rate |
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