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.
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Acknowledgements
This study was funded by the European Commission DGXIV/C/1 as study contract 97/081 “Seasonal changes in biological and ecological traits of demersal and deep-water fish species in the Azores”. The authors wish to thank the crew of the “R.V. Arquipélago” for invaluable help and commitment during the sampling for this investigation and Maria Aboim for assistance with sampling on the Portuguese mainland. We also acknowledge provision of facilities for this work by Prof. Ricardo Santos, Departamento Oceanografica e Pescas, University of the Azores, Faial Island; Prof. Patrick Holligan at the School of Ocean & Earth Science, University of Southampton, Southampton Oceanography Centre; Professor Christopher Rapley, British Antarctic Survey. Special thanks for technical assistance and help with laboratory work are due to Mark Dixon, School of Biological Science, University of Southampton, and members of the Molecular Ecology Research Group Ex. School of Ocean & Earth Science, University of Southampton.
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Communicated by J.P. Thorpe, Port Erin
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Stockley, B., Menezes, G., Pinho, M.R. et al. Genetic population structure in the black-spot sea bream (Pagellus bogaraveo Brünnich, 1768) from the NE Atlantic. Marine Biology 146, 793–804 (2005). https://doi.org/10.1007/s00227-004-1479-3
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DOI: https://doi.org/10.1007/s00227-004-1479-3