A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic
Successful resolution of the nomenclature and taxonomy of batoid fish complicated by the high degree of morphological and ecological conservatism in this group. However, both mitochondrial DNA (mtDNA) and nuclear DNA (nDNA) phylogenies have been utilised to resolve batoid phylogenies and even to ide...
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University of Exeter
2020
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ftunivexeter:oai:ore.exeter.ac.uk:10871/120924 2024-09-15T18:02:44+00:00 A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic Bache-Jeffreys, M Griffiths, A Stevens, J 2020 http://hdl.handle.net/10871/120924 unknown University of Exeter College of Life and Environmental Sciences http://hdl.handle.net/10871/120924 http://www.rioxx.net/licenses/all-rights-reserved Phylogenetics Batoids Rays Skates Endangered RAD-seq mtDNA Thesis or dissertation Masters by Research in Biological Sciences Masters MbyRes Dissertation 2020 ftunivexeter 2024-07-29T03:24:13Z Successful resolution of the nomenclature and taxonomy of batoid fish complicated by the high degree of morphological and ecological conservatism in this group. However, both mitochondrial DNA (mtDNA) and nuclear DNA (nDNA) phylogenies have been utilised to resolve batoid phylogenies and even to identify cryptic species. As a result, the number of ray species described in recent decades has dramatically increased- although questions still remain regarding the taxonomic status of many batoid species. In chapter one of this thesis, the importance of taxonomy in skate conservation and management is reviewed. In chapter two, control region (CR) and cytochrome oxidase I (COI) sequencing of the blue skate (Dipturus batis) and the flapper skate (Dipturus intermedius) from across the Northeast Atlantic was performed, in order to clarify their geographical distribution. Although now formally recognised as distinct species, before 2010 these two taxa were classified together as the critically endangered ‘common skate’, D. batis. Although this has important conservation implications, their protection is currently being hindered by a lack of spatiotemporal data. In the present study, the blue skate generally appears to be more common than the flapper skate, with a distribution extending from Rockall and Iceland to the Western Approaches and the Celtic Sea. Whilst the flapper skate appears most frequent around northern Scotland, the North Sea and Ireland, novel data also suggests that it may have once had a much wider distribution. For the first time, this species was identified in the Azores, where unique haplotypes were also isolated, potentially highlighting the genetic distinctiveness of the population in this region. In chapter three, nextRAD and mtDNA (concatenated CR and COI) sequencing were utilised to explore the phylogenetics of several vulnerable species of European skate. Whilst the current designation of the Madeiran skate (Raja maderensis) and the thornback ray (Raja clavata) as distinct species wasn’t fully ... Master Thesis Common skate Dipturus batis Iceland North Atlantic Northeast Atlantic University of Exeter: Open Research Exeter (ORE) |
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Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
unknown |
topic |
Phylogenetics Batoids Rays Skates Endangered RAD-seq mtDNA |
spellingShingle |
Phylogenetics Batoids Rays Skates Endangered RAD-seq mtDNA Bache-Jeffreys, M A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic |
topic_facet |
Phylogenetics Batoids Rays Skates Endangered RAD-seq mtDNA |
description |
Successful resolution of the nomenclature and taxonomy of batoid fish complicated by the high degree of morphological and ecological conservatism in this group. However, both mitochondrial DNA (mtDNA) and nuclear DNA (nDNA) phylogenies have been utilised to resolve batoid phylogenies and even to identify cryptic species. As a result, the number of ray species described in recent decades has dramatically increased- although questions still remain regarding the taxonomic status of many batoid species. In chapter one of this thesis, the importance of taxonomy in skate conservation and management is reviewed. In chapter two, control region (CR) and cytochrome oxidase I (COI) sequencing of the blue skate (Dipturus batis) and the flapper skate (Dipturus intermedius) from across the Northeast Atlantic was performed, in order to clarify their geographical distribution. Although now formally recognised as distinct species, before 2010 these two taxa were classified together as the critically endangered ‘common skate’, D. batis. Although this has important conservation implications, their protection is currently being hindered by a lack of spatiotemporal data. In the present study, the blue skate generally appears to be more common than the flapper skate, with a distribution extending from Rockall and Iceland to the Western Approaches and the Celtic Sea. Whilst the flapper skate appears most frequent around northern Scotland, the North Sea and Ireland, novel data also suggests that it may have once had a much wider distribution. For the first time, this species was identified in the Azores, where unique haplotypes were also isolated, potentially highlighting the genetic distinctiveness of the population in this region. In chapter three, nextRAD and mtDNA (concatenated CR and COI) sequencing were utilised to explore the phylogenetics of several vulnerable species of European skate. Whilst the current designation of the Madeiran skate (Raja maderensis) and the thornback ray (Raja clavata) as distinct species wasn’t fully ... |
author2 |
Griffiths, A Stevens, J |
format |
Master Thesis |
author |
Bache-Jeffreys, M |
author_facet |
Bache-Jeffreys, M |
author_sort |
Bache-Jeffreys, M |
title |
A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic |
title_short |
A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic |
title_full |
A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic |
title_fullStr |
A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic |
title_full_unstemmed |
A Phylogenetic Study of Vulnerable Batoid Species from the North Atlantic |
title_sort |
phylogenetic study of vulnerable batoid species from the north atlantic |
publisher |
University of Exeter |
publishDate |
2020 |
url |
http://hdl.handle.net/10871/120924 |
genre |
Common skate Dipturus batis Iceland North Atlantic Northeast Atlantic |
genre_facet |
Common skate Dipturus batis Iceland North Atlantic Northeast Atlantic |
op_relation |
http://hdl.handle.net/10871/120924 |
op_rights |
http://www.rioxx.net/licenses/all-rights-reserved |
_version_ |
1810440156824469504 |