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Table 1.

Correlations between size, performance, organ mass, and enzyme activity for Trinidadian guppies

Mass
Enzyme activity
LengthBodyHeartGillSwim motorO2maxBurst speedCSLDHATPase
Standard length  0.941* 0.612* 0.702* 0.903* 0.841* 0.420* 0.222* 0.197* 0.052 
Body mass 0.919*  0.643* 0.794* 0.965* 0.826* 0.408* 0.222* 0.318* 0.070 
Heart mass 0.475* 0.458*  0.609* 0.621* 0.565* 0.294* 0.133 0.199* 0.084 
Gill mass 0.546* 0.550* 0.558*  0.797* 0.632* 0.293* 0.241* 0.227* 0.076 
Swimming motor mass 0.892* 0.972* 0.423* 0.522*  0.828* 0.382* 0.180* 0.339* 0.110 
O2max 0.721* 0.764* 0.470* 0.517* 0.742*  0.415* 0.133 0.208* 0.059 
Burst speed 0.175* 0.180* 0.012 0.003 0.192* 0.135  0.152 0.173* −0.063 
CS −0.223* −0.213* −0.027 −0.065 −0.181* −0.162* −0.030  0.479* 0.016 
LDH 0.348* 0.539* 0.061 0.199* 0.557* 0.332* 0.172* −0.118  0.222* 
ATPase −0.006 −0.050 −0.021 −0.158 −0.049 0.041 0.020 −0.026 −0.134  
Mass
Enzyme activity
LengthBodyHeartGillSwim motorO2maxBurst speedCSLDHATPase
Standard length  0.941* 0.612* 0.702* 0.903* 0.841* 0.420* 0.222* 0.197* 0.052 
Body mass 0.919*  0.643* 0.794* 0.965* 0.826* 0.408* 0.222* 0.318* 0.070 
Heart mass 0.475* 0.458*  0.609* 0.621* 0.565* 0.294* 0.133 0.199* 0.084 
Gill mass 0.546* 0.550* 0.558*  0.797* 0.632* 0.293* 0.241* 0.227* 0.076 
Swimming motor mass 0.892* 0.972* 0.423* 0.522*  0.828* 0.382* 0.180* 0.339* 0.110 
O2max 0.721* 0.764* 0.470* 0.517* 0.742*  0.415* 0.133 0.208* 0.059 
Burst speed 0.175* 0.180* 0.012 0.003 0.192* 0.135  0.152 0.173* −0.063 
CS −0.223* −0.213* −0.027 −0.065 −0.181* −0.162* −0.030  0.479* 0.016 
LDH 0.348* 0.539* 0.061 0.199* 0.557* 0.332* 0.172* −0.118  0.222* 
ATPase −0.006 −0.050 −0.021 −0.158 −0.049 0.041 0.020 −0.026 −0.134  

Results for females are in the upper right and results for males are in the lower left.

N=133-147 for females (N=99 for ATPase) and 160-168 for males.

Asterisks indicate significance at the P=0.05 level; numbers in boldface remained significant after Bonferroni correction for multiple simultaneous tests (Rice,1989; adjusted α=0.00172).

O2max,maximum oxygen consumption; CS, citrate synthetase activity; LDH, lactate dehydrogenase activity; ATPase, myofibrillar ATPase activity.

Heart mass and gill mass are dry mass; swimming motor mass is wet mass.

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