Population structure and demographic history of Genypterus blacodes using microsatellite loci

Canales‐Aguirre, Cristian B.; Ferrada, Sandra; Hernández, Cristián E.; Galleguillos, Ricardo

doi:10.1016/j.fishres.2010.06.010

Cited by 18 publications

(8 citation statements)

References 29 publications

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“…The F ST and R ST indices were consistent with the Bayesian analyses, which means that our results are not dependent on the approach used. The result found in this study is in contrast with the genetic homogeneity found in other marine species in the same geographic area ( Genypterus blacodes [ 98 ]). However, our F ST and R ST outcomes are quite comparable to fixation indices at neutral loci obtained for relatives to Patagonian sprat S .…”

Section: Discussioncontrasting

confidence: 99%

“…fuegensis along the Argentinean Patagonian coast with a juvenile production of 1.3x10 9 individuals. Similarly, a probable explanation of the non-genetic differences found in Genypterus blacodes along inner waters, channels and fjords in Chilean Patagonia, was the close proximity of spawning grounds in the same study area [ 98 ]. Adult migration in S .…”

Section: Discussionmentioning

confidence: 99%

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Genetic Structure in a Small Pelagic Fish Coincides with a Marine Protected Area: Seascape Genetics in Patagonian Fjords

et al. 2016

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Marine environmental variables can play an important role in promoting population genetic differentiation in marine organisms. Although fjord ecosystems have attracted much attention due to the great oscillation of environmental variables that produce heterogeneous habitats, species inhabiting this kind of ecosystem have received less attention. In this study, we used Sprattus fuegensis, a small pelagic species that populates the inner waters of the continental shelf, channels and fjords of Chilean Patagonia and Argentina, as a model species to test whether environmental variables of fjords relate to population genetic structure. A total of 282 individuals were analyzed from Chilean Patagonia with eight microsatellite loci. Bayesian and non-Bayesian analyses were conducted to describe the genetic variability of S. fuegensis and whether it shows spatial genetic structure. Results showed two well-differentiated genetic clusters along the Chilean Patagonia distribution (i.e. inside the embayment area called TicToc, and the rest of the fjords), but no spatial isolation by distance (IBD) pattern was found with a Mantel test analysis. Temperature and nitrate were correlated to the expected heterozygosities and explained the allelic frequency variation of data in the redundancy analyses. These results suggest that the singular genetic differences found in S. fuegensis from inside TicToc Bay (East of the Corcovado Gulf) are the result of larvae retention bya combination of oceanographic mesoscale processes (i.e. the west wind drift current reaches the continental shelf exactly in this zone), and the local geographical configuration (i.e. embayment area, islands, archipelagos). We propose that these features generated an isolated area in the Patagonian fjords that promoted genetic differentiation by drift and a singular biodiversity, adding support to the existence of the largest marine protected area (MPA) of continental Chile, which is the Tic-Toc MPA.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Genetic Structure in a Small Pelagic Fish Coincides with a Marine Protected Area: Seascape Genetics in Patagonian Fjords

et al. 2016

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“…Estos autores además, señalaron que los resultados son concordantes con aquellos encontrados por Chong (1993). Recientemente, Canales-Aguirre et al (2010), emplearon técnicas de microsatelites para determinar la variabilidad genética y estructura poblacional del congrio dorado en tres subzonas de la zona sur-austral de Chile. Los resultados indicaron que no existe diferenciación genética a nivel de poblacional para la zona comprendida entre los 41° y 57°S.…”

Section: Discussionunclassified

Estimacion de mortalidad natural e incertidumbre para congrio dorado (Genypterus blacodes Schneider, 1801) en la zona sur austral de Chile

Wiff¹,

Quiróz²,

Ojeda³

et al. 2011

lajar

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RESUMEN.El congrio dorado (Genypterus blacodes) es un pez demersal de gran importancia económica en la pesquería multiespecífica y multiflota que opera en la zona sur-austral de Chile (41°28'-57°00'S). Desde principio de los años noventas se consideró para efectos de la evaluación poblacional la existencia de un único stock. Sin embargo, varios antecedentes relacionados con la historia de vida y demografía han conducido a que, desde el año 2005, la evaluación de esta especie se realice bajo dos stocks administrativos, uno en la zona norte (41°28'-47°00'S) y otro en la zona sur (47°00'-57°00'S). La separación de stocks produce una demanda por actualización de parámetros de historia de vida, entre éstos la mortalidad natural (M). En este trabajo se estimó M para el congrio dorado mediante métodos empíricos aplicados por zona y sexo. La incertidumbre en M fue incorporada a través de remuestreo de Monte Carlo considerando dos fuentes de error, una proveniente de los parámetros de historia de vida que alimentan los modelos empíricos y otra, proveniente de los coeficientes que los definen. El promedio de M mediante los diferentes métodos mostró, para una determinada zona, importantes diferencias entre sexos, como también para sexos conjuntos entre zonas de pesca. Los individuos de la zona norte presentaron mayor M que aquellos provenientes de la zona sur y los coeficientes de variación por método son altamente dependientes del tipo de error incorporado. El método de Pauly (1980) parece ser el más adecuado para el congrio dorado entregando valores de M para sexos conjuntos de 0,27 año -1 (IC: 0,13-0,47) en la zona norte y 0,23 año -1 (IC: 0,11-0,40) en la zona sur.Palabras clave: Genypterus blacodes, mortalidad natural, pesquería demersal, historias de vida, demografía, sur de Chile. Estimation of natural mortality and uncertainty in pink cusk-eel (Genypterus blacodes Schneider, 1801) in southern ChileABSTRACT. Pink cusk-eel (Genypterus blacodes) is a demersal fish of high economic importance for the multi-species and multi-fleet fishery operating off far-southern Chile (41°28'-57°00'S). Since the early 1990s, the existence of a single stock was assumed for purposes of stock assessments. However, several attributes related with life history and demography led to the designation, as of 2005, of two administrative stocks of this species, a northern-austral stock stock (41°28'-47°00S) and a southern-austral stock (47°00-57°00S). The division of these stocks has produced a demand for updating life history parameters, including natural mortality (M). In the present work, we used empirical methods to estimate M for pink cusk-eel by zone and sex. The uncertainty in M was incorporated through Monte Carlo resampling considering two sources of error: one from the life history parameters that feed the empirical models and the other from the coefficients that define them. The average M obtained by the different methods showed important differences between sexes for a given zone and between combined sexes between the different fish...

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“…This genetic homogeneity is usual in marine fi shes (e.g. Canales-Aguirre et al 2010c) and especially in migratory pelagic species of the Humboldt Current System (e.g. Galleguillos et al 1997;Ferrada et al 2002).…”

Section: Locusmentioning

confidence: 91%

Genetic variability in jack mackerel Trachurus murphyi Nichols: New SSRs loci and application

Galleguillos¹,

Canales‐Aguirre²,

Ferrada³

2012

Gayana (Concepc.)

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Nine novel microsatellite loci were developed for Trachurus murphyi. These loci were characterized in samples from three sites along the eastern South Pacifi c Ocean. One of the loci was monomorphic, whereas the rest of the loci had between six and 19 alleles per locus and showed the expected heterozygosity ranging from 0.653 to 0.933. These loci do not show genetic differentiation among the analyzed sites. RESUMENNueve nuevos loci microsatélites fueron desarrollados para Trachurus murphyi. Estos loci fueron caracterizados en muestras de tres localidades a lo largo del océano Pacífi co suroriental. Uno de los loci fue monomórfi co, mientras que para el resto de los loci el número de alelos por locus oscilo entre 6 a 16 y la heterocigosidad esperada entre 0.653 a 0.933. Estos loci no muestran diferenciación entre las diferentes localidades analizadas.

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Population structure and demographic history of Genypterus blacodes using microsatellite loci

Cited by 18 publications

References 29 publications

Genetic Structure in a Small Pelagic Fish Coincides with a Marine Protected Area: Seascape Genetics in Patagonian Fjords

Genetic Structure in a Small Pelagic Fish Coincides with a Marine Protected Area: Seascape Genetics in Patagonian Fjords

Estimacion de mortalidad natural e incertidumbre para congrio dorado (Genypterus blacodes Schneider, 1801) en la zona sur austral de Chile

Genetic variability in jack mackerel Trachurus murphyi Nichols: New SSRs loci and application

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