Speciation and hybridisation in skuas (Catharacta spp.)
This study investigated the evolution of southern hemisphere skua taxa (Catharacta spp.) and revealed the modes and patterns of speciation in this group of seabirds. A hybrid zone between two species was investigated in more detail using AFLP to discriminate between species and their hybrids. This a...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
2009
|
Subjects: | |
Online Access: | https://nbn-resolving.org/urn:nbn:de:gbv:27-20090422-082120-3 https://www.db-thueringen.de/receive/dbt_mods_00012901 https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00017306 http://uri.gbv.de/document/gvk:ppn:597989575 |
id |
ftdbthueringen:oai:www.db-thueringen.de:dbt_mods_00012901 |
---|---|
record_format |
openpolar |
spelling |
ftdbthueringen:oai:www.db-thueringen.de:dbt_mods_00012901 2024-04-07T07:47:14+00:00 Speciation and hybridisation in skuas (Catharacta spp.) Ritz, Markus Halle, Stefan Heckel, Gerald Knijff, Peter de 2009 100 Seiten https://nbn-resolving.org/urn:nbn:de:gbv:27-20090422-082120-3 https://www.db-thueringen.de/receive/dbt_mods_00012901 https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00017306 http://uri.gbv.de/document/gvk:ppn:597989575 eng eng https://nbn-resolving.org/urn:nbn:de:gbv:27-20090422-082120-3 https://www.db-thueringen.de/receive/dbt_mods_00012901 https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00017306 http://uri.gbv.de/document/gvk:ppn:597989575 all rights reserved info:eu-repo/semantics/openAccess thesis Doktorarbeit ddc:590 für Harvesting bereitgestellt Klasse A Südliche Hemisphäre Skua Hybridisierung AFLP dissertation Text doc-type:PhDThesis 2009 ftdbthueringen 2024-03-08T13:32:26Z This study investigated the evolution of southern hemisphere skua taxa (Catharacta spp.) and revealed the modes and patterns of speciation in this group of seabirds. A hybrid zone between two species was investigated in more detail using AFLP to discriminate between species and their hybrids. This assignment could be used to uncover the degree of admixture and patterns of gene flow between both taxa. Skuas colonised the southern hemisphere before 220,000yBP, probably around the glaciation maximum at 250,000yBP. Diversification was rapid between 210,000 – 150,000yBP and coincided with a glacial period spanning 230,000 – 150,000yBP. The oldest taxon is most likely the South Polar Skua (Catharacta maccormicki), of which the Brown Skua (C. a. lonnbergi) split off first. The Tristan Skua (C. antacrtica hamiltoni) diverged from Atlantic populations of Brown Skuas and the Chilean Skua (C. chilensis) most likely originated from long-distance colonisation by Tristan Skuas to South America. The origin of the Falkland Skua (C. antarctica antarctica) is the least well defined of the southern taxa and the taxon may be the result of immigration from surrounding populations of several taxa. All taxa and many populations were significantly differentiated from each other. The South Polar Skua is the most homogenous taxon, while the Brown Skuas shows strong phylogeographic structure across its circum-Antarctic range. Evidence for gene flow was detected between most neighbouring population pairs of different taxa. This agrees with actual observations of limited hybridisation between Chilean Skua and Falkland Skua, South Polar Skua and Chilean Skua and extensive hybridisation between South Polar Skua and Brown Skua. The southern taxa do not deserve species status after the strict application of the Biological Species Concept but can be treated as species following the Comprehensive Biological Species Concept. Even so, the strong mitochondrial differentiation of the Brown Skua is not reflected by its current taxonomy. Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Brown Skua Catharacta maccormicki Digital Library Thüringen Antarctic Tristan ENVELOPE(140.900,140.900,-66.735,-66.735) |
institution |
Open Polar |
collection |
Digital Library Thüringen |
op_collection_id |
ftdbthueringen |
language |
English |
topic |
thesis Doktorarbeit ddc:590 für Harvesting bereitgestellt Klasse A Südliche Hemisphäre Skua Hybridisierung AFLP |
spellingShingle |
thesis Doktorarbeit ddc:590 für Harvesting bereitgestellt Klasse A Südliche Hemisphäre Skua Hybridisierung AFLP Ritz, Markus Speciation and hybridisation in skuas (Catharacta spp.) |
topic_facet |
thesis Doktorarbeit ddc:590 für Harvesting bereitgestellt Klasse A Südliche Hemisphäre Skua Hybridisierung AFLP |
description |
This study investigated the evolution of southern hemisphere skua taxa (Catharacta spp.) and revealed the modes and patterns of speciation in this group of seabirds. A hybrid zone between two species was investigated in more detail using AFLP to discriminate between species and their hybrids. This assignment could be used to uncover the degree of admixture and patterns of gene flow between both taxa. Skuas colonised the southern hemisphere before 220,000yBP, probably around the glaciation maximum at 250,000yBP. Diversification was rapid between 210,000 – 150,000yBP and coincided with a glacial period spanning 230,000 – 150,000yBP. The oldest taxon is most likely the South Polar Skua (Catharacta maccormicki), of which the Brown Skua (C. a. lonnbergi) split off first. The Tristan Skua (C. antacrtica hamiltoni) diverged from Atlantic populations of Brown Skuas and the Chilean Skua (C. chilensis) most likely originated from long-distance colonisation by Tristan Skuas to South America. The origin of the Falkland Skua (C. antarctica antarctica) is the least well defined of the southern taxa and the taxon may be the result of immigration from surrounding populations of several taxa. All taxa and many populations were significantly differentiated from each other. The South Polar Skua is the most homogenous taxon, while the Brown Skuas shows strong phylogeographic structure across its circum-Antarctic range. Evidence for gene flow was detected between most neighbouring population pairs of different taxa. This agrees with actual observations of limited hybridisation between Chilean Skua and Falkland Skua, South Polar Skua and Chilean Skua and extensive hybridisation between South Polar Skua and Brown Skua. The southern taxa do not deserve species status after the strict application of the Biological Species Concept but can be treated as species following the Comprehensive Biological Species Concept. Even so, the strong mitochondrial differentiation of the Brown Skua is not reflected by its current taxonomy. |
author2 |
Halle, Stefan Heckel, Gerald Knijff, Peter de |
format |
Doctoral or Postdoctoral Thesis |
author |
Ritz, Markus |
author_facet |
Ritz, Markus |
author_sort |
Ritz, Markus |
title |
Speciation and hybridisation in skuas (Catharacta spp.) |
title_short |
Speciation and hybridisation in skuas (Catharacta spp.) |
title_full |
Speciation and hybridisation in skuas (Catharacta spp.) |
title_fullStr |
Speciation and hybridisation in skuas (Catharacta spp.) |
title_full_unstemmed |
Speciation and hybridisation in skuas (Catharacta spp.) |
title_sort |
speciation and hybridisation in skuas (catharacta spp.) |
publishDate |
2009 |
url |
https://nbn-resolving.org/urn:nbn:de:gbv:27-20090422-082120-3 https://www.db-thueringen.de/receive/dbt_mods_00012901 https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00017306 http://uri.gbv.de/document/gvk:ppn:597989575 |
long_lat |
ENVELOPE(140.900,140.900,-66.735,-66.735) |
geographic |
Antarctic Tristan |
geographic_facet |
Antarctic Tristan |
genre |
Antarc* Antarctic Antarctica Brown Skua Catharacta maccormicki |
genre_facet |
Antarc* Antarctic Antarctica Brown Skua Catharacta maccormicki |
op_relation |
https://nbn-resolving.org/urn:nbn:de:gbv:27-20090422-082120-3 https://www.db-thueringen.de/receive/dbt_mods_00012901 https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00017306 http://uri.gbv.de/document/gvk:ppn:597989575 |
op_rights |
all rights reserved info:eu-repo/semantics/openAccess |
_version_ |
1795673083687731200 |