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Table 3.

Energetics of digesting fish, a generalized prey, by two populations of the garter snake Thamnophis elegans

NAssimilation efficiencySDA/assimilated energyNet assimilation efficiency
Intact fish     
Specialist snakes 12 0.824±0.027 0.154±0.018 0.695±0.027 
Generalist snakes 11 0.800±0.020 0.145±0.021 0.685±0.026 
Significance (P NS NS NS 
Lyophilized fish     
Specialist snakes 0.849±0.040 0.139±0.012 0.734±0.035 
Generalist snakes 0.850±0.030 0.272±0.040 0.619±0.042 
Significance (P NS <0.001 0.002 
NAssimilation efficiencySDA/assimilated energyNet assimilation efficiency
Intact fish     
Specialist snakes 12 0.824±0.027 0.154±0.018 0.695±0.027 
Generalist snakes 11 0.800±0.020 0.145±0.021 0.685±0.026 
Significance (P NS NS NS 
Lyophilized fish     
Specialist snakes 0.849±0.040 0.139±0.012 0.734±0.035 
Generalist snakes 0.850±0.030 0.272±0.040 0.619±0.042 
Significance (P NS <0.001 0.002 

Fish were presented in both intact and lyophilized form.

Efficiencies and ratios are defined in the text. Mean values (± 95%CL) are reported from single trial measurements on each individual snake. NS,not significant.

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