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Asynchronous Emergence of Flatback Seaturtles, Natator Depressus, from a Beach Hatchery in Northern Australia

Koch, A., Guinea, Michael L. and Whiting, Scott D. (2008). Asynchronous Emergence of Flatback Seaturtles, Natator Depressus, from a Beach Hatchery in Northern Australia. Journal of Herpetology,42(1):1-8.

Document type: Journal Article

IRMA ID 02468002xPUB13
Title Asynchronous Emergence of Flatback Seaturtles, Natator Depressus, from a Beach Hatchery in Northern Australia
Author Koch, A.
Guinea, Michael L.
Whiting, Scott D.
Journal Name Journal of Herpetology
Publication Date 2008
Volume Number 42
Issue Number 1
ISSN 0022-1511   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-40549111607
Start Page 1
End Page 8
Total Pages 8
Place of Publication Saint Louis, MO, US
Publisher Society for the Study of Amphibians and Reptiles
Field of Research 0608 - Zoology
HERDC Category C1 - Journal Article (DEST)
Abstract The timing and synchrony of sea turtle emergences from the nests are primary factors in determining hatchling vigor and likelihood of survival. A clear benefit of synchronous emergence is a reduction in energy expenditure through social facilitation, but disadvantages also result from reduction in energy stores if hatchlings have to wait any appreciable time in the nest. We investigated hatchling emergence times throughout emergence of the entire clutch for 21 clutches of Flatback Seaturtles, Natator depressus, incubating in a beach hatchery at three clutch sizes and three nest depths. Emergence of the entire clutch spanned an average of 3.1 days, with shallower nests exhibiting greater emergence asynchrony (mean20cm = 4.0 days, mean35cm = 4.5 days) than deeper nests (mean50cm = 1.7 days). Hatchlings emerged through the night, peaking between 2100 and 2200 h, with hatchlings from shallower nests emerging earlier in the night. For natural nests, hatchlings generally emerged within a single night, evident from the low number of hatchlings remaining in the nest the day after emergence. The disparate observations between a beach hatchery, and natural nests provide important conservation implications for hatchery management.
DOI http://dx.doi.org/10.1670/07-060.1   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Tue, 12 May 2009, 13:09:31 CST by Sarena Wegener