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The gametogenic cycle of Scrobicularia plana (Mollusca: Bivalvia) in Mweeloon Bay (Galway, west coast of Ireland) Raleigh, J.; Keegan, B.F. (2006). The gametogenic cycle of Scrobicularia plana (Mollusca: Bivalvia) in Mweeloon Bay (Galway, west coast of Ireland). J. Mar. Biol. Ass. U.K. 86(5): 1157-1162. https://dx.doi.org/10.1017/S0025315406014135 In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154; e-ISSN 1469-7769

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Beschikbaar in	Auteurs
VLIZ: Non-open access 353509 [ aanvragen ]

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Trefwoorden

Gonadosomatic index Morphogenesis > Gametogenesis Reproductive cycle Secretory organs > Glands > Endocrine glands > Animal reproductive organs > Gonads Spawning Scrobicularia plana (da Costa, 1778) [WoRMS] Eire, Galway, Mweeloon Bay [Marine Regions] Marien/Kust

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Auteurs		Top
Raleigh, J. Keegan, B.F.

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Abstract

The gametogenic cycle of Scrobicularia plana was studied in Mweeloon Bay (Galway, west coast of Ireland) over the periods of February to September 1996 and January to September 1997. Quantitative (reproductive indices and oocytes size) and qualitative (gonad developmental stages) analysis identified a broad annual breeding cycle, with one protracted spawning event occurring from May until September. Early gonad development had begun by January/February. Spawning animals were first recorded at the end of May and continued to mature throughout the summer. The decrease in temperature in September coincided with the end of the spawning season and gonad regression. Although the species is predominantly dioecious, one case of hermaphrodism was recorded. A female to male sex ratio of 1.1:1 was registered. Sexual maturity occurred at a shell length greater than 20 mm; the smallest individual undergoing sexual development had a shell length of 22.4 mm. The timing of the reproductive cycle in S. plana at Mweeloon Bay is in broad agreement with previous findings on the species carried out in northern latitudes.

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