The University of Southampton
University of Southampton Institutional Repository

Genetic population structure in the black-spot sea bream (Pagellus bogaraveo Brunnich, 1768) from the NE Atlantic

Genetic population structure in the black-spot sea bream (Pagellus bogaraveo Brunnich, 1768) from the NE Atlantic
Genetic population structure in the black-spot sea bream (Pagellus bogaraveo Brunnich, 1768) from the NE Atlantic
The depletion of shallow-water fish stocks through overexploitation has led to increasing fishing pressure on deep-sea species. Poor knowledge of the biology of commercially valuable deep-water fish has led to the serial depletion of stocks of several species across the world. Data regarding the genetic structure of deep-sea fish populations is important in determining the impact of overfishing on the overall genetic variability of species and can be used to estimate the likelihood of recolonisation of damaged populations through immigration of individuals from distant localities. Here the genetic structure of the commercially fished deep-water species the blackspot sea bream, Pagellus bogaraveo is investigated in the northeastern Atlantic using partial DNA sequencing of mitochondrial cytochrome b (cyt-b) and D-loop regions and genotyping of microsatellite loci. An absence of variation in cyt-b and low genetic variation in D-loop sequences potentially indicate that P. bogaraveo may have undergone a severe bottleneck in the past. Similar bottlenecks have been detected in other Atlantic species of fish and have possibly originated from the last glaciation. P. bogaraveo may have been particularly vulnerable to the effects of low temperature and a fall in sea level because stages of its life history occur in shallow water and coastal sites. However, there are other explanations of low genetic variability in populations of P. bogaraveo, such as a low population size and the impacts of fishing on population structure. Analysis of population structure using both D-loop and microsatellite analysis indicates low to moderate, but significant, genetic differentiation between populations at a regional level. This study supports studies on other deep-sea fish species that indicate that hydrographic or topographic barriers prevent dispersal of adults and/or larvae between populations at regional and oceanographic scales. The implications for the management and conservation of deep-sea fish populations are discussed.
0025-3162
793-804
Stockley, B.
3257f15f-b22d-4a7e-b537-86b2122c05d2
Menezes, G.
51dc105c-e3a8-44d9-84fc-925e5e7d3115
Pinho, M.R.
314ff307-de64-4fab-bf99-82b04a8c36b0
Rogers, A.D.
906fd860-72c9-4e72-ba43-36e78a1f4037
Stockley, B.
3257f15f-b22d-4a7e-b537-86b2122c05d2
Menezes, G.
51dc105c-e3a8-44d9-84fc-925e5e7d3115
Pinho, M.R.
314ff307-de64-4fab-bf99-82b04a8c36b0
Rogers, A.D.
906fd860-72c9-4e72-ba43-36e78a1f4037

Stockley, B., Menezes, G., Pinho, M.R. and Rogers, A.D. (2005) Genetic population structure in the black-spot sea bream (Pagellus bogaraveo Brunnich, 1768) from the NE Atlantic. Marine Biology, 146 (4), 793-804. (doi:10.1007/s00227-004-1479-3).

Record type: Article

Abstract

The depletion of shallow-water fish stocks through overexploitation has led to increasing fishing pressure on deep-sea species. Poor knowledge of the biology of commercially valuable deep-water fish has led to the serial depletion of stocks of several species across the world. Data regarding the genetic structure of deep-sea fish populations is important in determining the impact of overfishing on the overall genetic variability of species and can be used to estimate the likelihood of recolonisation of damaged populations through immigration of individuals from distant localities. Here the genetic structure of the commercially fished deep-water species the blackspot sea bream, Pagellus bogaraveo is investigated in the northeastern Atlantic using partial DNA sequencing of mitochondrial cytochrome b (cyt-b) and D-loop regions and genotyping of microsatellite loci. An absence of variation in cyt-b and low genetic variation in D-loop sequences potentially indicate that P. bogaraveo may have undergone a severe bottleneck in the past. Similar bottlenecks have been detected in other Atlantic species of fish and have possibly originated from the last glaciation. P. bogaraveo may have been particularly vulnerable to the effects of low temperature and a fall in sea level because stages of its life history occur in shallow water and coastal sites. However, there are other explanations of low genetic variability in populations of P. bogaraveo, such as a low population size and the impacts of fishing on population structure. Analysis of population structure using both D-loop and microsatellite analysis indicates low to moderate, but significant, genetic differentiation between populations at a regional level. This study supports studies on other deep-sea fish species that indicate that hydrographic or topographic barriers prevent dispersal of adults and/or larvae between populations at regional and oceanographic scales. The implications for the management and conservation of deep-sea fish populations are discussed.

This record has no associated files available for download.

More information

Published date: 2005

Identifiers

Local EPrints ID: 15346
URI: http://eprints.soton.ac.uk/id/eprint/15346
ISSN: 0025-3162
PURE UUID: cee2172f-30f0-480a-b8a1-c49881d93da6

Catalogue record

Date deposited: 05 Apr 2005
Last modified: 15 Mar 2024 05:38

Export record

Altmetrics

Contributors

Author: B. Stockley
Author: G. Menezes
Author: M.R. Pinho
Author: A.D. Rogers

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×