References in periodicals archive ?
Temperature and organism size: a biological law for ectotherms.
Studies have shown that ectotherms subject to high temperatures, but within the normal range they experience in the field, suffer denaturation of cellular proteins (Hofmann & Somero 1995); replacing these proteins requires energy that must be diverted from other tasks including, perhaps, maintaining the structures required for limb extension and retraction.
However, the study of ectothermic vertebrates might provide a fruitful alternative for such studies, providing a system where one can potentially separate the consequences of altering metabolism and body temperature, since these two functions are not as intricately intertwined in ectotherms as they are in endotherms.
Because the bones of mammals and other endotherms do not show growth rings, their presence in Syntarsus links that animal with ectotherms.
However, with respect to this rule, it is clear that its author devised it for endotherms, and that perhaps its extension to ectotherms produces these paradoxes.
In our study, we found that glycogen content, crude protein and ash in whole body were affected by temperature suggesting that temperature influences the physiological characteristics of ectotherms (Gillooly et al.
Ranges of optimal temperatures for various performance measures are also generally broader for smaller, juvenile ectotherms (Freitas et al.
Pathogenic fungi have primarily been viewed as threats to ectothermic organisms because ectotherms can have low body temperatures that are suitable for the growth of many fungi (31,39).
2000; Meiri and Dayan, 2003), but also to certain groups of ectotherms (e.
Lags have also been found in the bones of reptiles and amphibians and have until now been assumed to be limited to ectotherms - cold-blooded animals - that are more subject to the whims of harsh environments.
These results were also consistent with their dietary and behavioral habits, wood turtles being semi-aquatic, omnivorous ectotherms.
ectotherms that live in water and use gills to get oxygen; fleshy filaments that are filled with tiny blood vessels; fanlike structures used for steering, balancing, and moving; those on the top and bottom; hard, thin, overlapping plates that cover the skin).