Interplay between age class, sex and stress response in green turtles (Chelonia mydas)

Jessop, Tim S., and Hamann, Mark (2005) Interplay between age class, sex and stress response in green turtles (Chelonia mydas). Australian Journal of Zoology, 53 (2). pp. 131-136.

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We investigated plasma hormone profiles of corticosterone in green turtles (Chelonia mydas) in response to a capture stress protocol. Further, we examined whether age class and sex were covariates associated with variation in both basal corticosterone levels and the adrenocortical stress response of non-breeding green turtles. Green turtles responded to the capture stress protocol by significantly increasing plasma levels of corticosterone over an eight-hour period. Further, there was a significant effect of age class on the capacity for green turtles to produce corticosterone in response to a capture stressor, with juvenile green turtles having higher basal levels of corticosterone and producing significantly more corticosterone in response to capture stress than non-breeding adult turtles. In contrast there was no significant sex difference in the corticosterone stress response of green turtles irrespective of age class. In summary, green turtles exhibited an adrenocortical response to a capture stress protocol. This response was significantly associated with different age classes, perhaps suggesting that the response is increased in juvenile turtles to offset the reduced probability of survival consistent with this more vulnerable age class.

Item ID: 5958
Item Type: Article (Research - C1)
ISSN: 1446-5698
Keywords: marine turtle; physiology; reproduction
Date Deposited: 14 Jan 2010 04:28
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060899 Zoology not elsewhere classified @ 50%
06 BIOLOGICAL SCIENCES > 0606 Physiology > 060604 Comparative Physiology @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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