Microsatellite analysis of 6-hour-old embryos reveals no preferential intraspecific fertilization between cupped oysters Crassostrea gigas and Crassostrea angulata

Type Article
Date 2001-09
Language English
Author(s) Huvet ArnaudORCID, Balabaud K, Bierne Nicolas, Boudry PierreORCID
Affiliation(s) IFREMER, Lab Genet & Pathol, F-17390 La Tremblade, France.
IFREMER, CNRS, UMR 5000, Lab Genome Populat Interact, F-34200 Sete, France.
Source Marine Biotechnology (1436-2228) (Springer), 2001-09 , Vol. 3 , N. 5 , P. 448-453
DOI 10.1007/s10126-001-0017-2
WOS© Times Cited 28
Keyword(s) Paternal contribution, Microsatellites, In vitro crossings, Hybridization, Crassostrea angulata, Crassostrea gigas
Abstract Experimental examination of reproductive isolation is the first step in understanding li,hybridization processes. Here, we studied preferential fertilization between 2 cupped oyster taxa, Crassostrea angulata and Crassostrea gigas, as a potential prezygotic reproductive isolation. Early examination of sperm competition is now possible by molecular analysis of oyster embryos. This avoids the confounding effect of differential mortality during the larval stage. Six hundred embryos were sampled from 2 crosses. Three microsatellite loci were enough to determine without ambiguity the taxa of contributing sires of embryos. No evidence of preferential fertilization between gametes from the same taxa was shown. A significantly higher contribution of the C. gigas males was revealed with the C. angulata females, but not with the C. gigas females, which might suggest early heterosis or interaction differences between gametes. In the light of these results, natural hybridization between both taxa call be expected in cases of their geographical coexistence, as in the Southern European populations in which both taxa. are in contact as a result of aquaculture development.
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Huvet Arnaud, Balabaud K, Bierne Nicolas, Boudry Pierre (2001). Microsatellite analysis of 6-hour-old embryos reveals no preferential intraspecific fertilization between cupped oysters Crassostrea gigas and Crassostrea angulata. Marine Biotechnology, 3(5), 448-453. Publisher's official version : https://doi.org/10.1007/s10126-001-0017-2 , Open Access version : https://archimer.ifremer.fr/doc/00000/436/