Journal
HERPETOLOGICA
Volume 64, Issue 2, Pages 156-167Publisher
HERPETOLOGISTS LEAGUE
DOI: 10.1655/07-021.1
Keywords
Agkistrodon piscivorus; body temperatures; cottonmouth; reproductive condition; thermoregulation
Categories
Ask authors/readers for more resources
Females of some temperate-zone snake species appear to exhibit thermophilic behavior during gestation, resulting in differential habitat use between gravid and nongravid individuals. We investigated thermoregulation of 13 female cottonmouths (Agkistrodon piscivorus) near their northwestern range limit in southwestern Missouri during mid-summer. Mean preferred body temperature (23.4 C) and preferred body temperature range (T-set, 20.0-26.5 C) measured in a laboratory thermal gradient were lower than those reported for most snake species. Physical models demonstrated that T-set consistently was available to snakes during the study period, although the frequency of availability varied among habitats. The relatively high thermal quality of the environment (based on availability) allowed Snakes to achieve field body temperatures (T-b) closely matching laboratory preferences. Gravid females exploited the thermal environment more efficiently than nongravid females by preferentially occupying the most thermally favorable microhabitats. Accordingly, gravid females consistently maintained higher T-b, than nongravid females, demonstrating a functional link between habitat use and thermoregulation. Differences in T-b between gravid and nongravid females were greatest at low ambient temperatures, highlighting their different thermoregulatory strategies. Maintenance of low T-b in nongravid females is consistent with an energy conservation strategy benefiting reproductive investment.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available