The respiratory capacity of marine mussels (Mytilus galloprovincialis) in relation to the high temperature threshold |
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| Authors: | Jeroen M Jansen Herman Hummel Sjoerd Wendelaar Bonga |
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| Institution: | aWageningen IMARES, Korringaweg 5, P.O. Box 77, 4400 AB Yerseke, The Netherlands;bNetherlands Institute of Ecology (NIOO), Korringaweg 7, P.O. Box 140, 4400 AC Yerseke, The Netherlands;cFaculty of Science, Institute IWWR, Radbout University (RU), Toernooiveld 1, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands |
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| Abstract: | Thermal tolerance limits of ectotherms may result from respiratory limitations. In response to declining oxygen availability, organisms have shown to exhibit oxyregulation by enhancing ventilation and heartbeat rates. In this study we examined how this regulatory response in mussels (Mytilus) changes with increasing temperature. Experimental mussels showed extensive oxyregulation at temperatures near to their habitat temperature, but increasingly lost this capacity towards higher temperatures. At breakpoint temperature no regulation took place and respiration rates changed proportional to oxygen availability. These results revealed how thermal limitations relate to respiratory capacity of mussels. |
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| Keywords: | Thermal tolerance limits Oxyregulation Mytilus galloprovincialis |
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