Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata

Seven enzyme loci were analyzed in three natural populations of Crassostrea angulata located on the southern Atlantic coast of the Iberian Peninsula. Two of the populations showed distinct levels of contamination by heavy metals, whereas the third was not contaminated and served as control. These se...

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Main Authors: Cross, I, Rebordinos, L
Format: Online
Language:eng
Published: Iniversidad Autónoma de Baja California 2003
Online Access:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/142
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record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Cross, I
Rebordinos, L
spellingShingle Cross, I
Rebordinos, L
Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata
author_facet Cross, I
Rebordinos, L
author_sort Cross, I
title Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata
title_short Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata
title_full Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata
title_fullStr Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata
title_full_unstemmed Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata
title_sort effect of marine contamination on the genetic population structure of the bivalve crassostrea angulata
description Seven enzyme loci were analyzed in three natural populations of Crassostrea angulata located on the southern Atlantic coast of the Iberian Peninsula. Two of the populations showed distinct levels of contamination by heavy metals, whereas the third was not contaminated and served as control. These seven loci were shown to be very variable in terms of the number of alleles, polymorphism and average heterozygosity. The Lap and Mdh1 loci presented null alleles. A significant positive correlation was found between the number of alleles and the concentration of iron that was fitted to a model of linear regression. However, this correlation was negative for the heterozygosity, and significant for cadmium and zinc. The Em, Lap, Mdh1 and Xdh loci showed a deficit of heterozygotes in all the populations. The values of heterozygotic deficit (D) were statistically significant between the contaminated populations and the control for Mdh1 and very close to a significant level for Em. In Pgm, a heterozygotic excess appeared in the control population and a deficit, which was correlated to the increased levels of metal concentration, occurred in the other two populations. The differences between the D values of the three populations were also significant in this locus. Positive, negative and significant relationships were obtained between the concentration of metals and some alleles of the Em, Lap and Pgm loci. Also, the homozygotic genotypes of the alleles with positive correlation values were selected in the contaminated areas, while the heterozygotes were more favoured in the control population, showing an adaptive behavior and corroborating the utility of some of these loci as biomarkers in studies of population dynamics in areas subjected to environmental contamination.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/142
_version_ 1715723935289442304
spelling oai:cienciasmarinas.com.mx:article-1422019-04-26T21:47:33Z Effect of marine contamination on the genetic population structure of the bivalve Crassostrea angulata Efecto de la contaminación marina sobre la estructura genética poblacional del bivalvo Crassostrea angulata Cross, I Rebordinos, L oyster Crassostrea angulata biomarker population allozyme ostra Crassostrea angulata biomarcadores poblaciones alozimas Seven enzyme loci were analyzed in three natural populations of Crassostrea angulata located on the southern Atlantic coast of the Iberian Peninsula. Two of the populations showed distinct levels of contamination by heavy metals, whereas the third was not contaminated and served as control. These seven loci were shown to be very variable in terms of the number of alleles, polymorphism and average heterozygosity. The Lap and Mdh1 loci presented null alleles. A significant positive correlation was found between the number of alleles and the concentration of iron that was fitted to a model of linear regression. However, this correlation was negative for the heterozygosity, and significant for cadmium and zinc. The Em, Lap, Mdh1 and Xdh loci showed a deficit of heterozygotes in all the populations. The values of heterozygotic deficit (D) were statistically significant between the contaminated populations and the control for Mdh1 and very close to a significant level for Em. In Pgm, a heterozygotic excess appeared in the control population and a deficit, which was correlated to the increased levels of metal concentration, occurred in the other two populations. The differences between the D values of the three populations were also significant in this locus. Positive, negative and significant relationships were obtained between the concentration of metals and some alleles of the Em, Lap and Pgm loci. Also, the homozygotic genotypes of the alleles with positive correlation values were selected in the contaminated areas, while the heterozygotes were more favoured in the control population, showing an adaptive behavior and corroborating the utility of some of these loci as biomarkers in studies of population dynamics in areas subjected to environmental contamination. Se analizaron siete loci alozímicos en tres poblaciones naturales de Crassostrea angulata localizadas en la costa suratlántica de la Península Ibérica. Dos de las poblaciones mostraban distintos niveles de contaminación por metales pesados, mientras que la otra no estaba contaminada y se utilizó como control. Los siete loci se mostraron muy variables en cuanto a número de alelos, nivel de polimorfismo y heterocigosidad media. Los loci Lap y Mdh1 presentaron alelos nulos. Para el hierro se encontró una correlación positiva significativa entre el número de alelos y la concentración que se ajustaba a un modelo de regresión lineal; sin embargo, esta correlación fue negativa para la heterocigosidad, y significativa para el cadmio y el zinc. Los loci Em, Lap, Mdh1 y Xdh mostraron déficits de heterocigotos en todas las poblaciones. Los valores de déficit de heterocigotos (D) fueron estadásticamente significativos entre las poblaciones contaminadas y la control para el locus Mdh1 y muy próximos al nivel de significación para el Em. En el locus Pgm apareció un exceso de heterocigotos en la población control y un déficit, correlacionado con el aumento de niveles de concentración de metales, en los otros dos. Las diferencias entre los valores de D de las tres poblaciones también fueron significativas para este locus. Se obtuvieron relaciones significativas, positivas y negativas entre la concentración de metales y algunos alelos de los loci Em, Lap y Pgm. Además, los genotipos homocigotos de los alelos con valores de correlación positivos fueron seleccionados en las zonas más contaminadas, mientras los heterocigotos eran los más favorecidos en la población control, mostrando un comportamiento adaptativo y corroborando la utilidad de algunos de estos loci como biomarcadores en estudios de dinámica de poblaciones en zonas sometidas a contaminación ambiental. Iniversidad Autónoma de Baja California 2003-03-06 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/142 10.7773/cm.v29i2.142 Ciencias Marinas; Vol. 29 No. 2 (2003); 239-250 Ciencias Marinas; Vol. 29 Núm. 2 (2003); 239-250 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/142/118