Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)

The population structure of the jumbo squid (Dosidicus gigas) is complex, containing several cohorts and three groups defined by their size (small, medium, and large) and by differences in maturation, growth, and life span. Several authors have indicated the possibility of such groups representing d...

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Main Authors:	Sandoval-Castellanos, E, Uribe-Alcocer, M, Díaz-Jaimes, P
Format:	info:eu-repo/semantics/article
Published:	Iniversidad Autónoma de Baja California 2009
Subjects:	Dosidicus gigas RAPDs mtDNA genetic differentiation ntDNA diferenciación genética
Online Access:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1387 https://repositorioinstitucional.uabc.mx/handle/20.500.12930/7422
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spelling	repositorioinstitucional-20.500.12930-74222021-06-03T03:55:16Z Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas) Ausencia de diferenciación entre grupos de talla del calamar gigante (Dosidicus gigas) Sandoval-Castellanos, E Uribe-Alcocer, M Díaz-Jaimes, P Dosidicus gigas RAPDs mtDNA genetic differentiation Dosidicus gigas RAPDs ntDNA diferenciación genética The population structure of the jumbo squid (Dosidicus gigas) is complex, containing several cohorts and three groups defined by their size (small, medium, and large) and by differences in maturation, growth, and life span. Several authors have indicated the possibility of such groups representing discrete genetic units even at level subspecies or species in statu nascendi. Genetic divergence was tested in samples from the Gulf of California (Mexico) and Peruvian Sea by estimation of population divergence statistics, an exact test of homogeneity of allele frequencies, analysis of molecular variance, and genealogical trees applied to data obtained with two molecular markers: RAPDs and mtDNA sequences identified by SSCPs. Neither significant values of θ (FST) nor significant heterogeneity in allele frequencies were detected. Lack of evidence does not imply complete lack of differentiation among the groups but supports the fact that a geographically spread population can have different size groups without relevant genetic differentiation, implying that the hypothetical genetically differentiated groups can occur in different ecological niches.  La estructura poblacional del calamar gigante (Dosidicus gigas) es aparentemente compleja al contener varias cohortes y a tres grupos identificados que fueron definidos por su talla (pequeño, mediano y grande) y por diferencias en su maduración, crecimiento y longevidad. Varios autores han señalado la posibilidad de que tales grupos representen unidades genéticamente discretas incluso a nivel de subespecies o especies en status nascendii. Se probó la hipótesis de divergencia genética en muestras del Golfo de California (México) y del Mar de Perú mediante la estimación de estadísticos de divergencia poblacional, una prueba exacta de homogeneidad de frecuencias alélicas, un análisis de varianza molecular y árboles genealógicos; aplicados a datos obtenidos con dos marcadores moleculares: RAPDs y secuencias de mtDNA identificadas mediante SSCPs. No se detecaron valores significativos de θ (FST) ni heterogeneidad en las frecuencias alélicas. La falta de evidencia no necesariamente implica la ausencia de diferenciación entre los grupos pero sustenta el hecho de que la población, en su amplia extensión geográfica, puede tener diferentes grupos de talla sin diferenciación genética relevante, implicando que los hipotéticos grupos genéticamente diferenciados pueden ocurrir en diferentes nichos ecológicos. 2009-12-08 2021-06-03T03:55:16Z 2021-06-03T03:55:16Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed research note Nota de investigación arbitrada https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1387 10.7773/cm.v35i4.1387 https://repositorioinstitucional.uabc.mx/handle/20.500.12930/7422 #PLACEHOLDER_PARENT_METADATA_VALUE# https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1387/1787 none application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 35 No. 4 (2009); 419-428 Ciencias Marinas; Vol. 35 Núm. 4 (2009); 419-428 2395-9053 0185-3880
institution	Repositorio Institucional
collection	DSpace
topic	Dosidicus gigas RAPDs mtDNA genetic differentiation Dosidicus gigas RAPDs ntDNA diferenciación genética
spellingShingle	Dosidicus gigas RAPDs mtDNA genetic differentiation Dosidicus gigas RAPDs ntDNA diferenciación genética Sandoval-Castellanos, E Uribe-Alcocer, M Díaz-Jaimes, P Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)
description	The population structure of the jumbo squid (Dosidicus gigas) is complex, containing several cohorts and three groups defined by their size (small, medium, and large) and by differences in maturation, growth, and life span. Several authors have indicated the possibility of such groups representing discrete genetic units even at level subspecies or species in statu nascendi. Genetic divergence was tested in samples from the Gulf of California (Mexico) and Peruvian Sea by estimation of population divergence statistics, an exact test of homogeneity of allele frequencies, analysis of molecular variance, and genealogical trees applied to data obtained with two molecular markers: RAPDs and mtDNA sequences identified by SSCPs. Neither significant values of θ (FST) nor significant heterogeneity in allele frequencies were detected. Lack of evidence does not imply complete lack of differentiation among the groups but supports the fact that a geographically spread population can have different size groups without relevant genetic differentiation, implying that the hypothetical genetically differentiated groups can occur in different ecological niches.
format	info:eu-repo/semantics/article
author	Sandoval-Castellanos, E Uribe-Alcocer, M Díaz-Jaimes, P
author_facet	Sandoval-Castellanos, E Uribe-Alcocer, M Díaz-Jaimes, P
author_sort	Sandoval-Castellanos, E
title	Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)
title_short	Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)
title_full	Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)
title_fullStr	Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)
title_full_unstemmed	Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)
title_sort	lack of genetic differentiation among size groups of jumbo squid (dosidicus gigas)
publisher	Iniversidad Autónoma de Baja California
publishDate	2009
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1387 https://repositorioinstitucional.uabc.mx/handle/20.500.12930/7422
_version_	1715745759428608000

Lack of genetic differentiation among size groups of jumbo squid (Dosidicus gigas)

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