Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south‐western Atlantic Ocean. Issue 1 (26th November 2014)
- Record Type:
- Journal Article
- Title:
- Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south‐western Atlantic Ocean. Issue 1 (26th November 2014)
- Main Title:
- Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south‐western Atlantic Ocean
- Authors:
- Garcia, G.
Pereyra, S.
Gutierrez, V.
Oviedo, S.
Miller, P.
Domingo, A. - Abstract:
- <abstract abstract-type="main" id="jfb12560-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p id="jfb12560-para-0001">Population genetic analyses based on both mitochondrial cytochrome b and the internal transcribed spacer 2 of recombinant (r)DNA genes were implemented to examine hypotheses of population differentiation in the angular angel shark <italic>Squatina guggenheim</italic>, one of the four most‐widespread endemic species inhabiting coastal ecosystems in the south‐western Atlantic Ocean. A total of 82 individuals of <italic>S. guggenheim</italic> from 10 sampling sites throughout the Río de la Plata mouth, its maritime front, the outer shelf at the subtropical confluence and the coastal areas of the south‐west Atlantic Ocean, were included. The analysis of molecular variance (AMOVA) based on the second internal transcribed spacer (<italic>its‐2</italic>) region supports that the samples from the outer shelf represent an isolated group from other sites. Historical gene flow in a coalescent‐based approach revealed significant immigration and emigration asymmetry between sampling sites. Based on the low level of genetic diversity, the existence of a long‐term population decline or a past recent population expansion following a population bottleneck could be proposed in <italic>S. guggenheim</italic>. This demographic differentiation suggests a degree of vulnerability to overexploitation in this endemic and endangered south‐west Atlantic Ocean shark,<abstract abstract-type="main" id="jfb12560-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p id="jfb12560-para-0001">Population genetic analyses based on both mitochondrial cytochrome b and the internal transcribed spacer 2 of recombinant (r)DNA genes were implemented to examine hypotheses of population differentiation in the angular angel shark <italic>Squatina guggenheim</italic>, one of the four most‐widespread endemic species inhabiting coastal ecosystems in the south‐western Atlantic Ocean. A total of 82 individuals of <italic>S. guggenheim</italic> from 10 sampling sites throughout the Río de la Plata mouth, its maritime front, the outer shelf at the subtropical confluence and the coastal areas of the south‐west Atlantic Ocean, were included. The analysis of molecular variance (AMOVA) based on the second internal transcribed spacer (<italic>its‐2</italic>) region supports that the samples from the outer shelf represent an isolated group from other sites. Historical gene flow in a coalescent‐based approach revealed significant immigration and emigration asymmetry between sampling sites. Based on the low level of genetic diversity, the existence of a long‐term population decline or a past recent population expansion following a population bottleneck could be proposed in <italic>S. guggenheim</italic>. This demographic differentiation suggests a degree of vulnerability to overexploitation in this endemic and endangered south‐west Atlantic Ocean shark, given its longevity and low reproductive potential.</p> </abstract> … (more)
- Is Part Of:
- Journal of fish biology. Volume 86:Issue 1(2015)
- Journal:
- Journal of fish biology
- Issue:
- Volume 86:Issue 1(2015)
- Issue Display:
- Volume 86, Issue 1 (2015)
- Year:
- 2015
- Volume:
- 86
- Issue:
- 1
- Issue Sort Value:
- 2015-0086-0001-0000
- Page Start:
- 186
- Page End:
- 202
- Publication Date:
- 2014-11-26
- Subjects:
- Fishes -- Periodicals
Fishes -- Great Britain -- Periodicals
597 - Journal URLs:
- http://onlinelibrary.wiley.com/ ↗
- DOI:
- 10.1111/jfb.12560 ↗
- Languages:
- English
- ISSNs:
- 0022-1112
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 4984.280000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 3910.xml