Larval growth and survival of two catarina scallop (Argopecten circularis, Sowerby, 1835) populations and their reciprocal crosses

“…Here, we used naive P. astreoides juveniles obtained from parental colonies from inshore and offshore populations, in order to minimize the effect of prior exposure to different environments. In addition, juvenile recruits were reared for 5 weeks in a common garden environment before conducting the thermal stress experiment to reduce the impact of maternal effects, as these effects are known to dissipate over the first month of life in marine invertebrate larvae (Cruz and Ibarra, 1997;Sman et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Heritable differences in fitness-related traits among populations of the mustard hill coral, Porites astreoides

2015

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A population's potential for rapid evolutionary adaptation can be estimated from the amount of genetic variation in fitnessrelated traits. Inshore populations of the mustard hill coral (Porites astreoides) have been shown to be more tolerant to thermal stress than offshore populations, but it is unclear whether this difference is due to long-term physiological acclimatization or genetic adaptation. Here, we evaluated variation in growth rate and survival among 38 families of juvenile recruits of P. astreoides spawned by colonies originating from inshore and offshore locations. Recruits were reared in a common garden for 5 weeks and then subjected to two thermal treatments (28 and 31°C) for 2.5 weeks. The most significant effects were detected during the first 5 weeks, before thermal stress was applied: 27-30% of variance in growth and 94% of variance in recruit survival was attributable to parental effects. Genotyping of eight microsatellite loci indicated that the high early mortality of some of the recruit families was not due to higher inbreeding. Post treatment, parental effects diminished such that only 10-15% of variance in growth rate was explained, which most likely reflects the dissipation of maternal effects. However, offshore-origin recruits still grew significantly less under elevated temperature compared with inshore-origin recruits. These differences observed in naive juvenile corals suggest that population-level variation in fitness in response to different thermal environments has a genetic basis and could represent raw material for natural selection in times of climate change.

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“…For example, hybrid scallops (Patinopecten yessoensis x Patinopecten caurinus) showed resistance to Perkinsus qugwadi, which is a lethal pathogen of P. yessoensis (Bower et al, 1997). The hybrids of two stocks of the catarina scallop (Argopecten circularis) displayed strong maternal effects and heterosis in terms of growth and survival (Cruz and Ibarra, 1997). In China, an interspecific cross between Chlamys farreri and P. yessoensis was attempted, and their hybrid descendants showed greater genetic diversity than the parental populations based on random amplified polymorphic DNA (RAPD) analysis (Teng et al, 2005), and heterosis was displayed in both growth and disease resistance (Yang et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Molecular genetic analysis of heterosis in interspecific hybrids of Argopecten purpuratus x A. irradians irradians

Lp¹,

Xt²,

Sun³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. Argopecten purpuratus and Argopecten irradians irradians hybridization was successfully performed and the hybrid offspring displayed apparent heterosis in growth traits. To better understand the genetic basis of heterosis, the genomic composition and genetic variation of the hybrids were analyzed with amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) markers. Seven of eight universal SSR primers displayed polymorphism in the hybrids and their parental groups, and hybrids inherited both parental genotypes at each locus. Using five primer combinations in AFLP analysis, 433 loci were amplified in the hybrids and their parental groups. The frequency of polymorphisms was 88.22%. F1 hybrids inherited 88.11 and 92.88% of AFLP bands from their parents. Some loci did not follow Mendelian Law, including 48 loci in parents that were lost, and 11 new loci that were amplified in the hybrids. The parameters of Nei's gene di- versity, Shannon's Information index, genetic distance, and molecular variance between groups were calculated. The genetic differentiation between two hybrid groups (0.253) was smaller than that between hybrids and their parents (0.554 to 0.645), and was especially smaller than that between two parental groups (0.769). The high genetic similarity (0.9347) and low genetic differentiation (0.2531) between two hybrid groups suggests that these hybrid groups were genetically very close. Heterozygosities of hybrid groups were higher than those of parental groups, indicating that the hybrids had increased genetic diversity.

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Larval growth and survival of two catarina scallop (Argopecten circularis, Sowerby, 1835) populations and their reciprocal crosses

Cited by 101 publications

References 21 publications

Artificial interspecific backcrosses between the hybrid of female Crassostrea hongkongensis × male C. gigas and the two parental species

Artificial interspecific backcrosses between the hybrid of female Crassostrea hongkongensis × male C. gigas and the two parental species

Heritable differences in fitness-related traits among populations of the mustard hill coral, Porites astreoides

Molecular genetic analysis of heterosis in interspecific hybrids of Argopecten purpuratus x A. irradians irradians

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