Reproduction and ecology of the hermaphroditic cockle Clinocardium nuttallii (Bivalvia: Cardiidae) in Garrison Bay

In this first description of the hermaphroditic reproductive cycle of the cockle Clinocardium nuttallii, male and female follicles are shown to develop in phase with each other. The gametes of both sexes are spawned about the same time. The cockles in Garrison Bay spawn from April to November, usual...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 1982-01, Vol.7 (2), p.137-145
Main Authors: Gallucci, V.F, Gallucci, B.B
Format: Article
Language:English
Subjects:
Clams
Clinocardium nuttallii
Cockles
Follicles
Gametogenesis
Gonads
Grade 1
Grade 3
Marine
Oocytes
Predation
RESEARCH PAPERS
Sediments
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Summary:In this first description of the hermaphroditic reproductive cycle of the cockle Clinocardium nuttallii, male and female follicles are shown to develop in phase with each other. The gametes of both sexes are spawned about the same time. The cockles in Garrison Bay spawn from April to November, usually in the second year, but for a small segment of the stock there is the potential to spawn in the first year of life. Density, growth rate, patterns of mortality and other ecological factors are discussed in relation to the evolution of bisexual reproduction. The central driving forces toward bisexual reproduction are the combination of environmental unpredictability and predatory pressure, where no refuge in size exists to guide the allocation of energy between reproduction and growth.
ISSN:0171-8630
1616-1599
DOI:10.3354/meps007137