Genetic differentiation among Atlantic island populations ofthe brown spiny lobsterPanulirus echinatus(Decapoda:Palinuridae)
Declines inPanulirus echinatus Smith, 1869 populations along their wide distribu-tion in the Atlantic Ocean have spurred efforts to improve their fisheries manage-ment and conservation. In this study, the genetic structure of these populations isreported for the first time.2. In a survey of 18 speci...
| Authors: | , , , , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2020 |
| Country: | Brasil |
| Institution: | Universidade Federal do Ceará (UFC) |
| Repository: | Repositório Institucional da Universidade Federal do Ceará (UFC) |
| Language: | English |
| OAI Identifier: | oai:repositorio.ufc.br:riufc/63293 |
| Online Access: | http://www.repositorio.ufc.br/handle/riufc/63293 |
| Access Level: | Open access |
| Keyword: | Connectivity Conservation Equatorial barrier Conectividade Conservação Barreira equatorial |
| Summary: | Declines inPanulirus echinatus Smith, 1869 populations along their wide distribu-tion in the Atlantic Ocean have spurred efforts to improve their fisheries manage-ment and conservation. In this study, the genetic structure of these populations isreported for the first time.2. In a survey of 18 species-specific polymorphic microsatellite markers, 152 individ-uals were genotyped from five Atlantic oceanic islands, covering most of theinsular distribution range of the species. The analyses revealed thatP. echinatusisgenetically partitioned into two stocks in the Atlantic Ocean. A highly significantgenetic structure was observed between north-east and south-west Atlanticpopulations based on fixation index, discriminant analysis of principal compo-nents, and structure and barrier analysis.3. We suggest that the Equatorial Circulation System represents a biophysical bar-rier that effectively limits migration among Atlantic subtropical gyre systems, ashas been described for other species. Other physical and ecological barriers, suchas the Mid-Atlantic Ridge itself, the distance between the eastern and westernsides of the Atlantic (Mid-Atlantic Barrier) and water mass differences, as well asother biological aspects, may also influence larval dispersal and modulate the insu-lar distribution of this species.4. The results show the existence of two distinct genetic stocks ofP. echinatusandhave implications for fisheries management in the Atlantic Ocean, including theirindependent management according to their individual status. The Cabo Verdeand the Canarian populations (north-east Atlantic) showed the lowest level ofgenetic variability in comparison with the south-western populations. A combina-tion of factors that have occurred or are occurring in the Canary Islands, such asoverfishing and volcanic eruptions, is likely to explain the reduced abundance ofthis lobster species in the area. |
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