Interactions between ecology, demography, capture stress, and profiles of corticosterone and glucose in a free-living population of Australian freshwater crocodiles

Jessop, TS, Tucker, AD, Limpus, CJ and Whittier, JM (2003) Interactions between ecology, demography, capture stress, and profiles of corticosterone and glucose in a free-living population of Australian freshwater crocodiles. General And Comparative Endocrinology, 132 1: 161-170. doi:10.1016/S0016-6480(03)00078-9


Author Jessop, TS
Tucker, AD
Limpus, CJ
Whittier, JM
Title Interactions between ecology, demography, capture stress, and profiles of corticosterone and glucose in a free-living population of Australian freshwater crocodiles
Journal name General And Comparative Endocrinology   Check publisher's open access policy
ISSN 0016-6480
Publication date 2003
Sub-type Article (original research)
DOI 10.1016/S0016-6480(03)00078-9
Volume 132
Issue 1
Start page 161
End page 170
Total pages 10
Place of publication USA
Publisher Academic Press
Collection year 2003
Language eng
Subject C1
270503 Animal Anatomy and Histology
780105 Biological sciences
Abstract In this study we examined three aspects pertaining to adrenocortical responsiveness in free-ranging Australian freshwater crocodiles (Crocodylus johnstoni). First, we examined the ability of freshwater crocodiles to produce corticosterone in response to a typical capture-stress protocol. A second objective addressed the relationship between capture stress, plasma glucose and corticosterone. Next we examined if variation in basal and capture-stress-induced levels of plasma corticosterone was linked to ecological or demographic factors for individuals in this free-ranging population. Blood samples obtained on three field trips were taken from a cross-sectional sample of the population. Crocodiles were bled once during four time categories at 0, 0. 5, 6, and 10 h post-capture. Plasma corticosterone increased significantly with time post-capture. Plasma glucose also significantly increased with duration of capture-stress and exhibited a positive and significant relationship with plasma corticosterone. Significant variation in basal or stress induced levels of corticosterone in crocodiles was not associated with any ecological or demographic factors including sex, age class or the year of capture that the crocodiles were sampled from. However, three immature males had basal levels of plasma corticosterone greater than 2 standard deviations above the mean. While crocodiles exhibited a pronounced, adrenocortical and hyperglycaemic response to capture stress, limited variation in adrenocortical responsiveness due to ecological and demographic factors was not evident. This feature could arise in part because this population was sampled during a period of environmental benigness. (C) 2003 Elsevier Science (USA). All rights reserved.
Keyword Crocodile
Crocodylus
Cortucisteribe
Glucose
Capture Stress
Ecology
Demography
Endocrinology & Metabolism
Corticosterone
Crocodylus-johnstoni
Alligator-mississippiensis
Hormonal Responses
American Alligator
Seasonal-changes
Sceloporus-occidentalis
Plasma-corticosterone
Physiological Stress
Urosaurus-ornatus
Green Turtles
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
Centre for Marine Studies Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 23 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 02:22:29 EST