Seasonal variation in plasma catecholamines, and adipose tissue lipolysis in adult female green sea turtles

Hamann, Mark, Limpus, Colin J., and Whittier, Joan M. (2003) Seasonal variation in plasma catecholamines, and adipose tissue lipolysis in adult female green sea turtles. General and Comparative Endocrinology , 130 (3). pp. 308-316.

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We investigated three aspects of potential interrenal regulation of reproduction in female green sea turtles, Chelonia mydas. First, seasonal trends in plasma catecholamines were examined from female C. mydas at different stages of their reproductive cycles. Second, variation in catecholamine levels during a nesting season were analysed in relation to restraint time, and ecological variables such as nesting habitat, body size, and reproductive investment. Third, catecholamine and corticosterone (CORT) induced lipolysis was investigated with adipose tissue collected from gravid green turtles, using in vitro incubations. Plasma epinephrine (EPI) was lowest in non-vitellogenic (1.55±0.26 ng/ml) and post-breeding (1.57±0.22 ng/ml) females, and highest in courting females (2.87±0.28). Concentrations of norepinephrine (NE) and EPI were relatively constant throughout a nesting season, and not significantly related to restraint time, reproductive investment or nesting habitat. In vitro concentrations of CORT (>3 ng/ml) and NE (2 ng/ml) induced significant release of glycerol after 6 h of incubation. Epinephrine tended to induce an antilipolytic affect at low concentrations (0.25 ng/ml) and a net lipolytic response at higher concentrations (>1 ng/ml). Our data suggest that EPI may play a role in regulating body condition during vitellogenesis, and maintaining energy stores during prolonged aphagia during courtship and nesting in female green sea turtles. Furthermore, we provide preliminary evidence that suggests that catecholamine production may be either down regulated or de-sensitised in gravid female C. mydas.

Item ID: 8052
Item Type: Article (Research - C1)
ISSN: 1095-6840
Keywords: Catecholamine; Lipolysis; green sea turtle; Chelonia mydas; reproduction
Date Deposited: 01 Feb 2010 00:46
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060806 Animal Physiological Ecology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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