High variance in reproductive success of the Pacific oyster (Crassostrea gigas, Thunberg) revealed by microsatellite-based parentage analysis of multifactorial crosses

Boudry, Pierre; Collet, Bertrand; Cornette, Florence; Hervouet, Veronique; Bonhomme, François

doi:10.1016/s0044-8486(01)00841-9

Cited by 201 publications

(133 citation statements)

References 23 publications

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“…However, F ST and G-test results indicated a high genetic differentiation between wild and hatchery populations, as previously reported in other mollusks such as, the European flat oyster (Lallias et al, 2010a) and abalone (Hara and Sekino, 2007). This differentiation reflects a strong alteration of allelic frequencies in the hatchery that is most likely due to genetic drift resulting from the limited size of the broodstock (commonly 30-60 individuals), combined with high variance in reproductive success (Boudry et al, 2002;Morvezen et al, 2013).…”

Section: Genetic Diversitysupporting

confidence: 75%

“…This result can be explained by the high variance in reproductive success that strongly reduces the effective number of breeders. High variance in reproductive success is often observed in bivalve hatcheries (Boudry et al, 2002;Lallias et al, 2010b), including in the great scallop (Morvezen et al, 2013). For the wild populations, some estimates and some upper confidence interval included infinity.…”

Section: Effective Population Sizesmentioning

confidence: 99%

“…Second, the effective population size (Ne) of cultured stocks is commonly much lower than wild stocks, potentially leading to a depletion of the local genetic variability due to strong genetic drift. This is particularly the case in marine bivalves, where very high fecundities associated with high variance in reproductive success lead to small Ne in cultured populations (Boudry et al, 2002;Appleyard and Ward, 2006;Lallias et al, 2010b). As a consequence, enhancing wild populations with hatchery-born individuals can induce a reduction of their effective population size.…”

Section: Introductionmentioning

confidence: 99%

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Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

et al. 2016

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The mass release of hatchery-propagated stocks raises numerous questions concerning its efficiency in terms of local recruitment and effect on the genetic diversity of wild populations. A seeding program, consisting of mass release of hatchery-produced juveniles in the local naturally occurring population of great scallops (Pecten maximus L.), was initiated in the early 1980s in the Bay of Brest (France). The present study aims at evaluating whether this seeding program leads to actual population enhancement, with detectable effects on genetic diversity and effective population size, or consists of sea ranching with limited genetic consequences on the wild stock. To address this question, microsatellite-based genetic monitoring of three hatchery-born and naturally recruited populations was conducted over a 5-year period. Results showed a limited reduction in allelic richness but a strong alteration of allelic frequencies in hatchery populations, while genetic diversity appeared very stable over time in the wild populations. A temporal increase in relatedness was observed in both cultured stock and wild populations. Effective population size (Ne) estimates were low and variable in the wild population. Moreover, the application of the Ryman-Laikre model suggested a high contribution of hatchery-born scallops to the reproductive output of the wild population. Overall, the data suggest that the main objective of the seeding program, which is stock enhancement, is fulfilled. Moreover, gene flow from surrounding populations and/or the reproductive input of undetected sub-populations within the bay may buffer the Ryman-Laikre effect and ensure the retention of the local genetic variability.

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Section: Genetic Diversitysupporting

confidence: 75%

Section: Effective Population Sizesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

et al. 2016

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“…How frequently giant clams self-fertilize in the current widely-used fertilization technique could be evaluated with analysis of DNA microsatellite markers (e.g. Boudry et al 2002) for adult clams and D-larvae. (2) The second study needed is to determine whether the self-fertilization causes deleterious effects (e.g.…”

Section: Discussionmentioning

confidence: 99%

Possibility of self-fertilization during hatchery culturing of giant clam, Tridacna crocea

Kurihara

Fuseya

Katoh

et al. 2010

Plankton Benthos Res

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Giant clams are simultaneous hermaphrodites and are assumed to ejaculate first and, after completely stopping ejaculation, release eggs. In the seed production method aimed at preventing self-fertilization, each adult clam is induced to ejaculate in a tank and then release eggs in another tank. Giant clams, however, have recently been suggested to continue ejaculation for a period after the beginning of egg release. The overlap between ejaculation and egg release might lead to self-fertilization in the tank used for egg release, especially for the eggs released just at the beginning of spawning. We examined the possibility of such self-fertilization for the giant clam Tridacna crocea and obtained three results. (1) In observations with the naked eye in a laboratory, 2 of 38 T. crocea simultaneously ejaculated and released eggs. (2) In a laboratory experiment, 1.5 to 80.0% of eggs released from each adult clam developed into D-shaped larvae without artificial cross-fertilization. Such development occurred more frequently for the eggs released earlier from each adult clam than for the eggs released later from the clam. (3) In observations at a hatchery, 2 to 94% of the eggs released from 4 of 5 adults were found to develop into D-shaped larvae without artificial cross-fertilization. The three results suggest that at least some T. crocea adults continue ejaculation for a period after starting spawning eggs, which causes self-fertilization.

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“…3A and the model of Schweinsberg 2003). This has led to the development of empirical studies using genotyping in fish and crustaceans to confirm this effect for example in Pacific Oysters (Boom et al 1994;Boudry et al 2002) or atlantic cod (Li & Hedgecock 1998;Arnason et al 2000;Arnason 2004). …”

Section: Neutral Mechanism: Skew In Offspring Production Per Capitamentioning

confidence: 99%

Coalescence 2.0: a multiple branching of recent theoretical developments and their applications

Tellier

Lemaire

2014

Preprint

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Population genetics theory has laid the foundations for genomics analyses including the recent burst in genome scans for selection and statistical inference of past demographic events in many prokaryote, animal and plant species. Identifying SNPs under natural selection and underpinning species adaptation relies on disentangling the respective contribution of random processes (mutation, drift, migration) from that of selection on nucleotide variability. Most theory and statistical tests have been developed using the Kingman's coalescent theory based on the Wright-Fisher population model. However, these theoretical models rely on biological and life-history assumptions which may be violated in many prokaryote, fungal, animal or plant species. Recent theoretical developments of the so called multiple merger coalescent models are reviewed here (Λ-coalescent, beta-coalescent, Bolthausen-Snitzman, Ξ-coalescent). We explicit how these new models take into account various pervasive ecological and biological characteristics, life history traits or life cycles which were not accounted in previous theories such as 1) the skew in offspring production typical of marine species, 2) fast adapting microparasites (virus, bacteria and fungi) exhibiting large variation in population sizes during epidemics, 3) the peculiar life cycles of fungi and bacteria alternating sexual and asexual cycles, and 4) the high rates of extinction-recolonization in spatially structured populations. We finally discuss the relevance of multiple merger models for the detection of SNPs under selection in these species, for population genomics of very large sample size and advocate to potentially examine the conclusion of previous population genetics studies.

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High variance in reproductive success of the Pacific oyster (Crassostrea gigas, Thunberg) revealed by microsatellite-based parentage analysis of multifactorial crosses

Cited by 201 publications

References 23 publications

Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

Possibility of self-fertilization during hatchery culturing of giant clam, Tridacna crocea

Coalescence 2.0: a multiple branching of recent theoretical developments and their applications

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