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
Language:eng
Published: Iniversidad Autónoma de Baja California 2009
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Online Access:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1387
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spelling repositorioinstitucional-20.500.12930-74222023-05-09T14:30:57Z 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://hdl.handle.net/20.500.12930/7422 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1387/1787 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
language eng
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
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