Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california

 The genetic variation of the two largest Modiolus capax (Conrad, 1837) populations that occur on the west coast of the Gulf of California was studied by the allozyme analysis of eight polymorphisms of twelve isozyme loci. Genetic variation was examined in about 200 mussels collected from t...

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Main Authors: Rosa-Vélez, J, Farfán, C, Cervantes-Franco, MA
Format: Online
Language:eng
Published: Iniversidad Autónoma de Baja California 2000
Online Access:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/620
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spelling oai:cienciasmarinas.com.mx:article-6202019-05-03T00:25:45Z Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california Patrón geográfico de la variación genética en Modiolus capax (Conrad, 1837) del golfo de California Rosa-Vélez, J Farfán, C Cervantes-Franco, MA Modiolus capax mytilids allozyme variation genetic divergence Modiolus capax mitílidos variación alozímica divergencia genética  The genetic variation of the two largest Modiolus capax (Conrad, 1837) populations that occur on the west coast of the Gulf of California was studied by the allozyme analysis of eight polymorphisms of twelve isozyme loci. Genetic variation was examined in about 200 mussels collected from three levels of the intertidal zone and from three sublittoral demes. Two loci (LAP* and GPI*) displayed particularly high allelic diversity (18 and 19 alleles, respectively), many of which were rare (p < 0.1). Heterozygote deficiency was a common feature across all loci, probably explained by the Wahlund effect. The genetic structure of the population was analyzed using Wright's F-statistics, and its significance was assessed by permutation and numerical resampling methods. There was a lower degree of genetic divergence among intertidal levels (FST = 0.042) than among sublittoral demes (FST = 0.080), yet both values were significant. Comparisions between grouped genotype frequencies for each extreme locality (San Felipe vs La Paz) revealed a low but significant level of genetic divergence (FST = 0.049), which suggests genetic flow over vast geographic distances (approximately 1100 km), but slight local genetic divergence due to physical or biological factors acting over the larval dispersal and settlement. La variación genética de las dos poblaciones mayores de Modiolus capax (Conrad, 1837) presentes en la costa oeste del Golfo de California se estudió mediante el análisis alozímico de ocho polimorfismos de doce loci isozímicos. La variación genética se analizó en alrededor de 200 mejillones recolectados en tres diferentes niveles de la zona intermareal y en tres demos sublitorales. Dos loci (LAP* y GPI*) presentaron un alto número de variantes (18 y 19 alelos, respectivamente), muchas de las cuales fueron raras (p < 0.1). La deficiencia de heterocigotos a través de los loci estudiados fue común y se explica por un probable efecto de Wahlund. La estructura genética de la población se analizó mediante el estadístico F de Wright, y su significancia fue evaluada mediante métodos de remuestreo y permutación. Se detectó un menor grado de divergencia genética entre los niveles del intermareal (FST = 0.042) que entre los demos sublitorales (FST = 0.080), aunque ambos valores fueron significativos. La comparación entre frecuencias genotípicas agrupadas para cada localidad extrema (San Felipe vs La Paz) revelaron una baja divergencia genética, aunque significativa (FST = 0.049), lo que sugiere flujo genético en vastas distancias geográficas (aproximadamente 1100 km), pero ligera divergencia genética debida a factores físicos o biológicos que actúan sobre la dispersión y el asentamiento larvario. Iniversidad Autónoma de Baja California 2000-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/620 10.7773/cm.v26i4.620 Ciencias Marinas; Vol. 26 No. 4 (2000); 585-606 Ciencias Marinas; Vol. 26 Núm. 4 (2000); 585-606 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/620/556
institution Ciencias Marinas
collection OJS
language eng
format Online
author Rosa-Vélez, J
Farfán, C
Cervantes-Franco, MA
spellingShingle Rosa-Vélez, J
Farfán, C
Cervantes-Franco, MA
Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california
author_facet Rosa-Vélez, J
Farfán, C
Cervantes-Franco, MA
author_sort Rosa-Vélez, J
title Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california
title_short Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california
title_full Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california
title_fullStr Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california
title_full_unstemmed Geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california
title_sort geographic pattern of genetic variation in modiolus capax (conrad, 1837) from the gulf of california
description  The genetic variation of the two largest Modiolus capax (Conrad, 1837) populations that occur on the west coast of the Gulf of California was studied by the allozyme analysis of eight polymorphisms of twelve isozyme loci. Genetic variation was examined in about 200 mussels collected from three levels of the intertidal zone and from three sublittoral demes. Two loci (LAP* and GPI*) displayed particularly high allelic diversity (18 and 19 alleles, respectively), many of which were rare (p < 0.1). Heterozygote deficiency was a common feature across all loci, probably explained by the Wahlund effect. The genetic structure of the population was analyzed using Wright's F-statistics, and its significance was assessed by permutation and numerical resampling methods. There was a lower degree of genetic divergence among intertidal levels (FST = 0.042) than among sublittoral demes (FST = 0.080), yet both values were significant. Comparisions between grouped genotype frequencies for each extreme locality (San Felipe vs La Paz) revealed a low but significant level of genetic divergence (FST = 0.049), which suggests genetic flow over vast geographic distances (approximately 1100 km), but slight local genetic divergence due to physical or biological factors acting over the larval dispersal and settlement.
publisher Iniversidad Autónoma de Baja California
publishDate 2000
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/620
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