期刊
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
卷 98, 期 -, 页码 160-169出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr2.2013.02.010
关键词
Pontinus kuhlii; Scorpaenidae; North-eastern Atlantic; Population structure; mtDNA
类别
资金
- IMAR grant under the project DEMERSAIS Monitorizacao das especies demersais dos Acores
- Azorean government
- Fundacao para a Ciencia e Tecnologia (FCT) [SFRH/BD/65730/2009]
- IMAR/DOP
- FCT
- EEA [PT0040/2008]
- DEECON Unravelling population connectivity for sustainable fisheries in the Deep Sea project
- EUROCORES programme [06-EuroDEEP-FP-008, SFRH-EuroDEEP/0002/2007]
- OASIS Oceanic Seamounts: an integrated study project [EVK3-CT-2002-00073-OASIS]
- European Union
- OE
- COMPETE
- DRCTC/GovAzores
- Fundação para a Ciência e a Tecnologia [SFRH/BD/65730/2009] Funding Source: FCT
The offshore rockfish (Pontinus kuhlii) is a widespread demersal fish in the temperate eastern Atlantic. This species inhabits hard bottoms at depths between 100 and 600 m and it is an important resource for the Azorean commercial fishing fleet. During several research fishing surveys in the Azores, Madeira and Cape Verde archipelagos diverse biological data on this species were collected. The degree of geographical population differentiation across the three Atlantic archipelagos was examined using two mitochondrial markers, control region (CR) and cytochrome b (cyt b). A total of 44 specimens were sequenced for each marker revealing high haplotypic diversity (CR: H-d = 0.9736; cyt b: H-d = 0.8520) and low nucleotide diversity (CR: pi=0.0171; cyt b: pi=0.0059). The sample size from the different subareas was limited but sufficient to reveal that no genetic structure was evident (Phi(ST)=-0.0465 to -0.0224), suggesting the existence of one panmictic population. Despite very different exploitation rates between archipelagos, the size structure of P. kuhlii was very similar and inter-annual variation was also low. Exploitation rates are probably too low to significantly affect the size structure, even in the Azores where the species is a secondary target of the commercial fishery. In the Azores region this species is more abundant on seamounts, however bigger fishes tend to occur on island slope than on seamounts. (C) 2013 Elsevier Ltd. All rights reserved.
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