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Table 1.

The effects of species (M. trossulus, M. edulis or M. galloprovincialis), acclimation temperature and salinity acclimation, as well as interactions between all three

Response
 
ANOVA
 
R2
 
Species
 
Temperature (T)
 
Salinity (S)
 
RHR (log) <0.0001 0.7533 <0.0001 <0.0001 0.3324 
Hcrit <0.0001 0.6004 <0.0001 <0.0001 0.7791 
LHR (log) 0.0001 0.4534 0.0012 <0.0001 0.8231 
Scrit (log)
 
<0.0001
 
0.7337
 
<0.0001
 
<0.0001
 
<0.0001
 
Response
 
Sp×T
 
Sp×S
 
T×S
 
Sp×T×S
 

 
RHR (log) 0.8190 0.7740 0.0658 0.4491  
Hcrit 0.6201 0.8110 0.5681 0.8625  
LHR (log) 0.2173 0.0411 0.0230 0.4998  
Scrit (log) 0.0091 0.7577 0.6493 0.0701  
Response
 
ANOVA
 
R2
 
Species
 
Temperature (T)
 
Salinity (S)
 
RHR (log) <0.0001 0.7533 <0.0001 <0.0001 0.3324 
Hcrit <0.0001 0.6004 <0.0001 <0.0001 0.7791 
LHR (log) 0.0001 0.4534 0.0012 <0.0001 0.8231 
Scrit (log)
 
<0.0001
 
0.7337
 
<0.0001
 
<0.0001
 
<0.0001
 
Response
 
Sp×T
 
Sp×S
 
T×S
 
Sp×T×S
 

 
RHR (log) 0.8190 0.7740 0.0658 0.4491  
Hcrit 0.6201 0.8110 0.5681 0.8625  
LHR (log) 0.2173 0.0411 0.0230 0.4998  
Scrit (log) 0.0091 0.7577 0.6493 0.0701  

Acclimation temperatures (T=7, 14 or 21°C); salinity acclimation (S=22, 28 or 34 p.p.t.).

P-values are from three-factor ANOVA. Significant results are in bold type. Species (Sp) and temperature acclimation (T) contribute greatly to the variation in all four heart rate parameters (in both years), while salinity (S) only contributes greatly to the variation in response to salinity stress. Because there are significant interaction terms, post-hoccomparisons were done only within a single temperature and salinity combination.

Heart activity parameters: RHR, resting heart rate at acclimation temperature (beats min-1); Hcrit, critical temperature during heat stress (°C); LHR, lowest heart rate at 0°C(beats min-1); Scrit, critical salinity during salinity stress (p.p.t.).

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