. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Temperature: Metabolic Aspects and Perception 359 and when the humidity decreases at a constant air temperature the reptile body fails to cool significantly (Fig. 93).'^^ The body coat of horny scales is not sufficiently permeable to water to permit much evaporation, although the temperature of small snakes averaged ° below air temperature in the range from 10° to 30° C.^'° A series of reptiles, mostly snakes and large turtles, at 20-25° vaporized only 2-6 gm. hrs.,'" in contrast to 76 gm
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Temperature: Metabolic Aspects and Perception 359 and when the humidity decreases at a constant air temperature the reptile body fails to cool significantly (Fig. 93).'^^ The body coat of horny scales is not sufficiently permeable to water to permit much evaporation, although the temperature of small snakes averaged ° below air temperature in the range from 10° to 30° C.^'° A series of reptiles, mostly snakes and large turtles, at 20-25° vaporized only 2-6 gm. hrs.,'" in contrast to 76 gm. by frogs.^â¢'â ^ Benedict has studied in detail the temperature relations and heat production by reptiles, particularly large ;"' The metabolism is relatively constant 7AM 7AM 7AM 7AM 7AM 7AM 7AM 7AM . RECTAL TEMP <v ENVIRONMENTAL n Ai^r!il h lo 12 14 Fig. 92. Influence of changes in environmental temperature on rectal temperature of a python snake. From Benedict.^® for various snakes at a given temperature; , at 22°, it is 21-24 hrs. The turtles produce more heat than do snakes or alligators, giant tortoises producing several times as much as snakes. In snakes, lizards, and turtles the heat production increases as the temperature rises. At 16° the level of heat production of reptiles is similar to frog metabolism and may be higher than it is in some fish.^^^ Many snakes and lizards absorb much radiant heat while basking in the sunlight. Lizards in the sun at air temperature of 13° C. had a cloacal tempera- ture of 38° C.^^ They may orient themselves to receive maximum radiation, and it is reported that the chromatophores of some lizards are expanded during. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd
Size: 1591px × 1571px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisher, booksubjectphysiologycomparative
