Effects of hatchery shading and nest depth on the development and quality of Chelonia mydas hatchlings: Implications for hatchery management in Peninsular Malaysia.

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Title Effects of hatchery shading and nest depth on the development and quality of Chelonia mydas hatchlings: Implications for hatchery management in Peninsular Malaysia.
Author Van De Merwe, Jason; Ibrahim, Kamarruddin; Whittier, Joan
Journal Name Australian Journal of Zoology
Year Published 2005
Place of publication Australia
Publisher CSIRO Publishing
Abstract One of the decisions made by hatchery managers around the world is what degree of shading and nest depth are required to maximise the production of high quality hatchlings at optimal sex ratios. The primary objectives of this study were to determine the effects of: 1) hatchery shading and nest depth on nest temperatures and emergence lag, and 2) nest temperatures and nest depth on hatchling sex ratio and quality. In 2001, 26 Chelonia mydas clutches from Ma'Daerah beach, Terengganu, Malaysia were relocated alternatively at depths of 50cm and 75cm into a 70% shaded and a 100% shaded hatchery. Data loggers were placed into the centre of each relocated clutch to record the temperature every hour over the course of incubation. When the hatchlings emerged, a sample of the clutch was run, measured and weighed and a separate sample was examined histologically for sex characteristics. Nest temperatures ranged between 280C and 300C and generally showed increases over the second half of incubation due to metabolic heating of the clutch. There was no significant correlation found between nest temperature and any of the hatchling parameters measured. Hatchlings from 75cm deep nests had a 46.4 (+ 10.2) hour longer emergence lag than hatchlings from 50cm deep nests. Hatch and emergence success were similar to natural populations and hatchling sex ratios were male dominant with an average of 72% males. There was a poor correlation between mean middle third incubation temperatures and sex ratio. Hatchlings from 75cm nests had similar running speeds but lower condition index than their conspecifics from 50cm deep nests
Peer Reviewed Yes
Published Yes
Publisher URI http://www.publish.csiro.au/view/journals/dsp_journal_fulltext.cfm?nid=90&f=ZO03052
Alternative URI http://www.publish.csiro.au/?paper=ZO03052
Copyright Statement Copyright 2005 CSIRO : This is the author-manuscript version of this paper. Please refer to the journal link for access to the definitive, published version.
Volume 53
Issue Number 3
Page from 205
Page to 211
ISSN 0004-959X
Date Accessioned 2006-02-08
Language en_AU
Research Centre Australian Rivers Institute
Faculty Faculty of Environmental Sciences
Subject Zoology
URI http://hdl.handle.net/10072/4404
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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