Population genetic structure of an estuarine and a reef fish species exploited by Brazilian artisanal fishing

Regina H.G Priolli,Miklos M Bajay,Renato A.M Silvano,Alpina Begossi

doi:10.3989/scimar.04407.17a

Regina H.G Priolli, Miklos M Bajay + Show 2 more

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https://doi.org/10.3989/scimar.04407.17a

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Journal: Scientia Marina	Publication Date: Nov 22, 2016
Citations: 4	License type: CC BY 4.0

Affiliation: University of South Africa

Abstract

In this study, we used microsatellite markers to examine the genetic structures of Centropomus undecimalis (Bloch, 1792) and Epinephelus marginatus (Lowe, 1834) populations collected from artisanal fishing sites along a stretch of coastline in southeastern Brazil. Based on F-statistics, there was no significant genetic differentiation evident in any C. undecimalis samples (FST=0.012). However, Bayesian clustering, principal component analysis (PCA) and discriminant analysis of principal components (DAPC) results suggested that there were most likely two clusters, with no relation to geographic areas. The bottleneck results showed no significant values and the effective population sizes (Ne) for the two genetically differentiated groups were large and similar. In contrast, for E. marginatus populations, the microsatellite loci showed no population subdivisions. The FST value was low and non-significant (FST=0.008), a Bayesian analysis indicated one cluster, and a PCA showed that all samples from different geographical sites shared the same genetic structure. The bottleneck results exhibited significant differences, and a low Ne was observed. The results of the genetic study of these two species along the southeastern Brazilian coast suggest that the distinct genetic structure of each species should be taken into account as management units for the conservation of their genetic diversities.

Highlights

A recent report on snappers and groupers (Amorim and Westmeyer 2016) shows that information on stocks is unclear, especially in developing countries that do not have a reporting system based on catch and effort data
Summary: In this study, we used microsatellite markers to examine the genetic structures of Centropomus undecimalis (Bloch, 1792) and Epinephelus marginatus (Lowe, 1834) populations collected from artisanal fishing sites along a stretch of coastline in southeastern Brazil
We present new genetic data on two commercial fish species from artisanal small-scale fisheries off the southeastern Brazilian coast: the common snook and the dusky grouper

Summary

Introduction

A recent report on snappers and groupers (Amorim and Westmeyer 2016) shows that information on stocks is unclear, especially in developing countries that do not have a reporting system based on catch and effort data This is the case in Brazil, where there is no systematic data collection on the stocks of snook (Centropomus spp.) and groupers (Epinephelus spp.). To address this lack, we present here new data on the genetic diversities of Centropomus undecimalis (Bloch, 1792) and Epinephelus marginatus (Lowe, 1834) from fishing spots off the southeastern coast of Brazil. These situations can promote decreases in fishery resources, with potential detrimental effects on population size (Perera et al 2011)

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