[OANNES Foro] Mating Systems and Reproductive Success in Hermaphroditic Bay Scallop, Argopecten irradians

[Mario Cabrejos]

Journal of the World Aquaculture Society
Volume 42, Issue 6, pages 888-898, December 2011
Article first published online: 2 DEC 2011
DOI: 10.1111/j.1749-7345.2011.00521.x

Mating Systems and Reproductive Success in Hermaphroditic Bay Scallop, Argopecten irradians irradians (Lamarck 1819), Inferred by Microsatellite-based Parentage Analysis
Ronghua Li, Qi Li
Key Laboratory of Mariculture Ministry of Education, Ocean University of China, Qingdao, China
Abstract

In this study, we used microsatellite-based parentage analysis to assess the mating system of a mass spawning bay scallop, Argopecten irradians irradians. Parental assignment was performed on 237 offspring and 14 candidate parents. Overall, 95% of all offspring were unambiguously allocated to their putative parents based on information from six highly polymorphic loci. Offspring from both the self-fertilization and cross-fertilization style were observed, the large variation of self-fertilization rate among individuals displays a mixed mode of mating. The high variances in reproductive success resulted in a decline in effective breeding numbers (Nb/N = 0.71). 

The self-fertilization rate was 32.89% for this mass spawning and the coefficient of inbreeding was estimated at around 16.5% per generation. When selfed larvae were removed, the relationship between relatedness and individual reproductive success was proved insignificant between half-sibings and unrelated, which suggest that selection pressures other than avoidance of inbreeding may be responsible for the evolution and maintenance of the self-compatible mating system of A. i. irradians. These results lend insight to A. i. irradians cultivation in present China and provide a genetic basis for the development of more effective spawning techniques.



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