Introduction 1999 2003 2001 2002 2002 1988 1973 1981 1990 1984 1995 Q 10 1976 M. edulis 1969 M. balthica 1991 Q 10 1999 2004 2002 Mytilus M. balthica 2000 2006 2001 2003 1985 Mytilus Mytilus galloprovincialis Mytilus edulis Mytilus trossulus Mytilus trossulus 1988 2001 2003 Mytilus M. balthica 2006 2003 Methods Fieldwork M. balthica Mytilus 1 2 Mytilus M. balthica Mytilus Mytilus M. balthica Mytilus M. balthica Fig. 1 Mytilus M. balthica Light gray medium gray dark gray white gray circles  1  2 3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  Fig. 2 Lines and error bars 2005  Temperature profiles ® 2005 Respiration rates M. balthica Mytilus M. balthica  Q 10  Q 10  Q 10 \documentclass[12pt]{minimal}
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\begin{document}$$ {\text{Q}}_{{10}} = {\left( {k_{2} /k_{1} } \right)}^{{{10} \mathord{\left/ {\vphantom {{10} {(t_{2} - t_{1} )}}} \right. \kern-\nulldelimiterspace} {(t_{2} - t_{1} )}}} $$\end{document} k 2 k 1 t 2 t 1 Statistical analysis M. balthica Mytilus 1992 1999 1996 1992 1996 x y M. balthica r 2  Mytilus r 2 M. balthica Mytilus Results Respiration rates at experimental temperatures 3 Mytilus 4 M. balthica Fig. 3 Mytilus  Numbers in square boxes 1  Fig. 4 M. balthica  Numbers in square boxes 1  3 2 (dry weight) 2 (dry weight) M. balthica 4 Respiration rates at acclimatization temperatures 5 Mytilus M. balthica 5 Mytilus P 5 P M. balthica 5 Fig. 5A–D black lines 1  A  B  A  B  C gray diamonds white triangles black circles BS NS MS BC P P  A  B  C  D  Thermal sensitivity of the metabolic rate  Q 10 6 M. balthica  Q 10  Q 10  Q 10  Q 10 6  Q 10 P Q 10   Q 10   Q 10 Fig. 6  Q 10 M. balthica circles Mytilus diamonds Trend lines r 2 P   Q 10 7  Q 10  Q 10  Q 10  M. balthica Mytilus 7  Q 10 Mytilus 7 10  M. balthica 7 Fig. 7A–B  Q 10 diamonds triangles circles  Q 10 M. balthica B a Mytilus A a b c  Discussion Rates at high experimental temperatures Mytilus M. balthica 2 (dry weight) 2002 Mytilus M. balthica 8 2002 2002 Mytilus M. balthica 1998 1971 1975 Fig. 8A–B Mytilus B diamonds M. balthica A circles numbers dashed lines  Rates at acclimatization temperatures The relations between the mean acclimatized respiration rates of the studied taxa and temperature are based on specimens from a great variety of microhabitats. Therefore, we expect these data to give a representative overview of metabolic temperature dependence in acclimatized mussels and clams. A narrow relation between temperature and acclimatized respiration rates in winter and springtime suggests that variations in the metabolic rate during this time of the year were directly dependent on temperature, and not limited by other physiological or environmental variables. A temperature-limited metabolic rate was also reflected by the high thermal sensitivity of the metabolic rate of some of the populations during those seasons. Only a few observations confirmed that the constant increase in respiration rates with acclimatization temperature can continue in summer and autumn, when most data points were found to be scattered below the upper edge slope. We suggest that the upper edge slopes represent the “metabolic scopes” of these taxa. However, since measurements are based on groups of specimens, respiration rates of single individuals can be higher. 2 2 2 (dry weight) 2 (dry weight) M. balthica 1981 1991 2000 Mytilus 2001 1978 1999 1984 2000 1971 2003 Mytilus 1969 1990 1980 1998 2000 2004 1998 2006 2002 Mytilus 5 1995 1979 1993 2006 Mytilus M. balthica Mytilus 1978 Cerastoderma edule 1980 Ostrea edulis 1994 Dreissena polymorpha 1995 Sensitivity of the metabolic rate to temperature changes Mytilus M. balthica Mytilus  Q 10  Q 10  6  Q 10  Q 10  Q 10 2002 1976 1991 Mytilus 2002 2004 1994 2006 2004 2003 Q 10 Mytilus  Q 10 1971 Q 10  Mytilus M. balthica M. balthica Electronic supplementary material Below is the link to the electronic supplementary material.
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