Bioenergetic modeling reveals that Chinese green tree vipers select postprandial temperatures in laboratory thermal gradients that maximize net energy intake.
With bioenergetic modeling, we tested the hypothesis that reptiles maximize net energy gain by postprandial thermal selection. Previous studies have shown that Chinese green tree vipers (Trimeresurus s. stejnegeri) have postprandial thermophily (mean preferred temperature T(p) for males =27.8 degrees C) in a linear thigmothermal gradient when seclusion sites and water existed. With some published empirical models of digestion associated factors for this snake, we calculated the average rate (E(net)) and efficiency (K(net)) of net energy gain from possible combinations of meal size, activity level, and feeding frequency at each temperature. The simulations consistently revealed that E(net) maximizes at the T(p) of these snakes. Although the K(net) peaks at a lower temperature than E(net), the value of K(net) remains high (>=0.85 in ratio to maximum) at the peak temperature of E(net). This suggested that the demands of both E(net) and K(net) can be attained by postprandial thermal selection in this snake. In conclusion, the data support our prediction that postprandial thermal selection may maximize net energy gain.
Tsai
Tein-Shun
TS
Department of Life Science, National Taiwan Normal University, 88 Ting-Chow Rd, Sec 4, Taipei 116, Taiwan.
Lee
How-Jing
HJ
Tu
Ming-Chung
MC
D000818:Animals; D001833:Body Temperature Regulation / Q000502:physiology*; D003198:Computer Simulation; D002149:Energy Intake / Q000502:physiology*; D004734:Energy Metabolism; D005247:Feeding Behavior; D006799:Housing, Animal; D008297:Male; D008954:Models, Biological; D019518:Postprandial Period; D013696:Temperature; D017841:Trimeresurus / Q000502:physiology*