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Asynchronous patterns of reproduction for the sympatric scallops Chlamys bifrons and Chlamys asperrima (Bivalvia : Pectinidae) in South Australia

Styan, Craig and Butler, A. J. 2003, Asynchronous patterns of reproduction for the sympatric scallops Chlamys bifrons and Chlamys asperrima (Bivalvia : Pectinidae) in South Australia, Marine and freshwater research, vol. 54, no. 1, pp. 77-86, doi: 10.1071/MF02019.

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Title Asynchronous patterns of reproduction for the sympatric scallops Chlamys bifrons and Chlamys asperrima (Bivalvia : Pectinidae) in South Australia
Author(s) Styan, Craig
Butler, A. J.
Journal name Marine and freshwater research
Volume number 54
Issue number 1
Start page 77
End page 86
Publisher CSIRO
Place of publication Collingwood, Vic.
Publication date 2003
ISSN 1323-1650
1448-6059
Keyword(s) bivalve
gamete release
reproductive cycle
spawning
synchrony
Summary Patterns of spawning activity were assessed by monitoring gonad states over 2.5 years for Chlamys asperrima and Chlamys bifrons at two sites in Gulf St Vincent, South Australia. Chlamys asperrima appeared to have a minor spawning in June, followed by a major spawning starting in late August. In contrast, the gonads of C. bifrons were regressed only during winter and it appeared that C. bifrons spawned for a long period, from late spring (September) until early autumn (March). At one site where sampling was frequent, there was evidence of three series of C. bifrons spawning events during the summer of 1994/95 and at least two series of events during 1995/96. Build-up and decrease in gonad weight was quick, but there was strong evidence of serial spawning for both species. Subsequently, we once observed C. asperrima spawning in situ at Edithburgh Jetty, at a time when gonad weights had been decreasing in previous years, but also long after the time when peak gonad weights had usually occurred. Only patches within the population were seen spawning, with scallops not spawning observed less than 100 m away from those that were. Indirect sampling of gonad condition also suggested that spawning in C. bifrons at Largs Bay was not always synchronous among patches of scallops within a population, nor always between sexes within patches.
Language eng
DOI 10.1071/MF02019
Field of Research 060808 Invertebrate Biology
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30004389

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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