Selective advantage of heterozygotes at catalase locus in the pacific oyster, Crassostrea gigas.

Fujio, Yoshihisa; Nakamura, Yuji; Sugita, Masakazu

doi:10.1266/jjg.54.359

Cited by 12 publications

(14 citation statements)

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“…The lowest heterozygosis value was recorded for the 1999 population. The values tended to increase towards 2001, but are lower than the value of 0.20 reported for other populations of Pacific oyster (Buroker et al, 1975;Fujio, 1982;Ozaki and Fujio, 1985;de la Rosa-Vélez et al, 1991;English et al, 2000;Yang et al, 2000). De la RosaVélez et al (1991) proposed that inbreeding, environmental selection and the Wahlund effect could be responsible for the heterozygote deficiency found when they studied oysters from San Quintín.…”

Section: Discussioncontrasting

confidence: 55%

“…La población de 1999 registró el valor menor de heterocigosis y se advierte que existe una tendencia a incrementar el valor de este parámetro hacia 2001. Sin embargo, éstos son menores al valor de 0.20 reportado para diferentes poblaciones de ostión japonés (Buroker et al, 1975;Fujio, 1982;Ozaki y Fujio, 1985;de la Rosa-Vélez et al, 1991;English et al, 2000;Yang et al, 2000). De la Rosa-Vélez et al (1991) presentaron algunas hipótesis (endogamia, selección por el medio ambiente y efecto Wahlund) para explicar la deficiencia de heterocigosis que encontraron al estudiar los ostiones cultivados de Bahía San Quintín.…”

Section: Discussionunclassified

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Allozymic variation in the Pacific oyster Crassostrea gigas from San Quintín Bay,Baja California, Mexico

et al. 2004

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Allozymic variability was analyzed in adult oysters Crassostrea gigas from the 1999, 2000 and 2001 crops of San Quintín Bay, Baja California, Mexico, using starch gel electrophoresis. The analysis included 13 enzymatic systems that revealed 25 loci, of which 16 were monomorphic and 9 were polymorphic. The values of observed heterozygosis ranged from 0.01 to 0.04, while according to the literature, the value for wild oysters is approximately 0.20. The results indicate that there are no statistical differences in the allozymic variability among the annual populations analyzed; however, the χ2 test revealed that in the three years, the oyster populations did not present an equilibrium with regard to the Hardy-Weinberg theoretical model. The three populations showed a reduced genetic diversity due to inbreeding and the bottleneck effect.

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Section: Discussioncontrasting

confidence: 55%

Section: Discussionunclassified

Allozymic variation in the Pacific oyster Crassostrea gigas from San Quintín Bay,Baja California, Mexico

et al. 2004

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“…A positive relationship between multiple-locus enzyme heterozygosity and growth, or energy available for growth, has recently been demonstrated for a number of marine invertebrates including mussels (e.g. Singh & Zouros 1978, Fujio 1982, Garton 1984, Garton et al 1984, Koehn & Gaffney 1984, Mitton & Grant 1984, Diehl et al 1985, Rodhouse et al 1986). It has been argued that this relationship is due to a greater average efficiency of basal or standard metabolism in more heterozygous individuals (Koehn & Shumway 1982, Garton 1984, Diehl et al 1985.…”

Section: Discussionmentioning

confidence: 99%

Genotypic and phenotypic differences between Baltic and North Sea populations of Mytilus edulis evaluated through reciprocal transplantations. III. Physiology

Tedengren¹,

André²,

Johannesson³

et al. 1990

Mar. Ecol. Prog. Ser.

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Mussels Mytilus edulis L., aged 1 yr, were transplanted from a low saline regime (6 to 7 %o S, northern Baltic proper) to a high saline regime (20 to 30 %O S, North Sea). Physiological responses of these mussels, after 1 mo and 1 yr of acclimatisation, were compared to those of native North Sea mussels and allele frequencies for 2 polymorphic loci (Pgi and Pgm) in the populations were scored.Oxygen consumption, ammonia excretion, 0 / N ratios, and clearance rate of transplanted Baltic mussels approached those of native North Sea mussels, indicating that these metabolic parameters are to a major extent regulated by physiological adaptations to environmental differences between the Baltic and North Seas. However, after 1 yr, significantly higher NHi-N excretion and lower 0/N ratios were observed in mussels of Baltic origin. A lower clearance rate and consequently lower scope for growth was observed in Baltic mussels. This may be due to a smaller gill area, resulting from a genetically induced more elongate shell shape, typical for Baltic mussels, that still remained after 1 yr of acclimatisation. The genetic composition in Pgi and Pgm, 2 loci coding for enzymes which are central to the metabolic rate of cellular processes, differed between the native populations, probably due to differential selection, and part of the observed physiological differences between mussels from the 2 seas may be determined by genotypic factors acting directly on metabolic pathways.

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“…La heterocigosidad tambien está positivamente relacionada con la sobrevivencia y crecimiento de larvas y adultos (Fujio, 1982). Se ha observado que la heterocigosidad en poblaciones cultivadas es ligeramente más baja que en las poblaciones silvestres y reducida heterocigosidad ha sido encontrada en muchas especies de moluscos procedentes de laboratorio (Xiao et al, 2005).…”

Section: Resultados Y Discusiónunclassified

CRECIMIENTO COMPARATIVO DE LA CONCHA DE ABANICO (Argopecten purpuratus ) EN SISTEMAS SUSPENDIDOS

2008

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ResumenCon el objetivo de determinar diferencias en el crecimiento de la concha de abanico Argopecten purpuratus procedentes de diferentes lugares, se realizaron dos experimentos de cultivo comparativo en sistemas suspendidos, tales como "pearl-nets" y linternas. El primer experimento se realizó con semillas obtenidas en laboratorio (IMARPE) y semillas silvestres colectadas en Bahía Independencia, Pisco; en el segundo, las semillas fueron colectadas de banco natural en Bahía Samanco y Lagunillas, Pisco. El trabajo se realizó en la playa "El Carbón", Pucusana. Para ambas experiencias se estimaron tasas de crecimiento, los parámetros K y L∞, índice de crecimiento (Φ) y factor de condición (FC). Se aplicó un análisis de covarianza (ANCOVA) y una prueba t para comparar las curvas de regresión longitud-peso.Los resultados mostraron diferencias en el crecimiento y factor de condición entre los grupos estudiados. En todos los casos las tasas de crecimiento observadas son comparables con los estimados por otros autores. Se discute que las diferencias se deberían a la variabilidad genética entre las poblaciones de donde fueron obtenidas las semillas. Palabras clave: cultivo, Argopecten purpuratus, parámetros, crecimiento, longitud AbstractIn order to determine differences in growth of the Peruvian scallop Argopecten purpuratus from different areas, two comparative experiments in suspended systems, such as pearl-nets and lantern nets, were carried out. The first one, was performed with seeds obtained from the hatchery at IMARPE, and wild seeds collected at Independence Bay, Pisco; the second one, was done with wild seeds from Samanco Bay and Lagunillas, Pisco. The study was carried out in Playa "El Carbón", Pucusana. For both experiments growth rates, K and L∞, parameters, growth rate (Φ) and condition factor, were estimated. An analysis of covariance (ANCOVA) and a t-test to compare the regression curves of the length-weight relationship were applied. The results showed differences in growth rates and condition factor, among the studied groups. In all cases the growth rates are comparable with values estimated by other authors. It is argued that differences estimated are due to a genetic variability among populations from different seed sources.

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Selective advantage of heterozygotes at catalase locus in the pacific oyster, Crassostrea gigas.

Cited by 12 publications

References 13 publications

Allozymic variation in the Pacific oyster Crassostrea gigas from San Quintín Bay,Baja California, Mexico

Allozymic variation in the Pacific oyster Crassostrea gigas from San Quintín Bay,Baja California, Mexico

Genotypic and phenotypic differences between Baltic and North Sea populations of Mytilus edulis evaluated through reciprocal transplantations. III. Physiology

CRECIMIENTO COMPARATIVO DE LA CONCHA DE ABANICO (Argopecten purpuratus ) EN SISTEMAS SUSPENDIDOS

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