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dc.contributor.authorvan de Merwe, Jasonen_US
dc.contributor.authorIbrahim, Kamarruddinen_US
dc.contributor.authorWhittier, Joanen_US
dc.date.accessioned2017-05-03T13:03:07Z
dc.date.available2017-05-03T13:03:07Z
dc.date.issued2005en_US
dc.date.modified2007-03-21T05:29:24Z
dc.identifier.issn1446-5698en_US
dc.identifier.doi10.1071/ZO03052en_US
dc.identifier.urihttp://hdl.handle.net/10072/4404
dc.description.abstractOne 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 nestsen_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherCSIRO Publishingen_US
dc.publisher.placeAustraliaen_US
dc.relation.ispartofstudentpublicationYen_AU
dc.relation.ispartofpagefrom205en_US
dc.relation.ispartofpageto211en_US
dc.relation.ispartofissue3en_US
dc.relation.ispartofjournalAustralian Journal of Zoologyen_US
dc.relation.ispartofvolume53en_US
dc.rights.retentionYen_AU
dc.subject.fieldofresearchcode270599en_US
dc.titleEffects of hatchery shading and nest depth on the development and quality of Chelonia mydas hatchlings: Implications for hatchery management in Peninsular Malaysia.en_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.facultyGriffith Sciences, Griffith School of Environmenten_US
gro.rights.copyrightCopyright 2005 CSIRO : This is the author-manuscript version of this paper. Please refer to the journal link for access to the definitive, published version.en_AU
gro.date.issued2005
gro.hasfulltextNo Full Text


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