Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands
An allozyme survey, using starch-gel electrophoresis, was carried out on eight populations of the Antarctic nemertean worm Parborlasia corrugatus (McIntosh, 1876) collected from locations around the South Orkney Islands, Antarctica. These populations were separated by distances in the order of tens...
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2016
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ftuloxford:oai:ora.ox.ac.uk:uuid:5591f16e-6e5a-448f-9859-74a922867d24 2024-09-30T14:24:09+00:00 Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands Rogers, A Clarke, A Peck, L 2016-07-28 https://doi.org/10.1007/s002270050290 https://ora.ox.ac.uk/objects/uuid:5591f16e-6e5a-448f-9859-74a922867d24 eng eng Springer Verlag doi:10.1007/s002270050290 https://ora.ox.ac.uk/objects/uuid:5591f16e-6e5a-448f-9859-74a922867d24 https://doi.org/10.1007/s002270050290 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.1007/s002270050290 2024-09-06T07:47:33Z An allozyme survey, using starch-gel electrophoresis, was carried out on eight populations of the Antarctic nemertean worm Parborlasia corrugatus (McIntosh, 1876) collected from locations around the South Orkney Islands, Antarctica. These populations were separated by distances in the order of tens of kilometres. Genetic variation was estimated over 22 enzyme loci for all populations examined, giving an observed heterozygosity of 0.142. This was much lower than the expected heterozygosity (H(e) = 0.201), and it was found that there was a significant deficiency of heterozygotes across four enzyme loci (p ≤ 0.01). A more detailed examination of this deficiency of heterozygotes was undertaken for the six populations and six variable enzyme loci for which the most complete data sets existed. A significant deficiency of heterozygotes was found at the enzyme locus Odh-1 for four of the six populations examined (p ≤ 0.01). Mean F(is) (0.240) indicated a significant (p ≤ 0.01) within-population component of the heterozygote deficiency estimated for the six populations sampled and this was mainly due to the Ap-1, Odh-1 and Pgm-1 loci. The mean F(st) value (0.036) was also significant (p ≤ 0.01), indicating a degree of genetic differentiation between populations. The observed levels of genetic differentiation between populations of P. corrugatus and the significant heterozygote deficiencies were unexpected, because this species has been reported to have a long-lived planktotrophic larva. It is hypothesised that recruitment of P. corrugatus in the South Orkney Islands originates from genetically distinct populations located in the Weddell Sea and to the west of the Antarctic Peninsula. Shifts in the relative position of the Weddell Sea Front, Weddell-Scotia Confluence and Scotia Front, relative to the South Orkney Islands, provide a mechanism for variation in the origin of recruits over time. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica South Orkney Islands Weddell Sea ORA - Oxford University Research Archive Antarctic Antarctic Peninsula McIntosh ENVELOPE(168.683,168.683,-77.517,-77.517) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) The Antarctic Weddell Weddell Sea Marine Biology 131 1 1 13 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
description |
An allozyme survey, using starch-gel electrophoresis, was carried out on eight populations of the Antarctic nemertean worm Parborlasia corrugatus (McIntosh, 1876) collected from locations around the South Orkney Islands, Antarctica. These populations were separated by distances in the order of tens of kilometres. Genetic variation was estimated over 22 enzyme loci for all populations examined, giving an observed heterozygosity of 0.142. This was much lower than the expected heterozygosity (H(e) = 0.201), and it was found that there was a significant deficiency of heterozygotes across four enzyme loci (p ≤ 0.01). A more detailed examination of this deficiency of heterozygotes was undertaken for the six populations and six variable enzyme loci for which the most complete data sets existed. A significant deficiency of heterozygotes was found at the enzyme locus Odh-1 for four of the six populations examined (p ≤ 0.01). Mean F(is) (0.240) indicated a significant (p ≤ 0.01) within-population component of the heterozygote deficiency estimated for the six populations sampled and this was mainly due to the Ap-1, Odh-1 and Pgm-1 loci. The mean F(st) value (0.036) was also significant (p ≤ 0.01), indicating a degree of genetic differentiation between populations. The observed levels of genetic differentiation between populations of P. corrugatus and the significant heterozygote deficiencies were unexpected, because this species has been reported to have a long-lived planktotrophic larva. It is hypothesised that recruitment of P. corrugatus in the South Orkney Islands originates from genetically distinct populations located in the Weddell Sea and to the west of the Antarctic Peninsula. Shifts in the relative position of the Weddell Sea Front, Weddell-Scotia Confluence and Scotia Front, relative to the South Orkney Islands, provide a mechanism for variation in the origin of recruits over time. |
format |
Article in Journal/Newspaper |
author |
Rogers, A Clarke, A Peck, L |
spellingShingle |
Rogers, A Clarke, A Peck, L Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands |
author_facet |
Rogers, A Clarke, A Peck, L |
author_sort |
Rogers, A |
title |
Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands |
title_short |
Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands |
title_full |
Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands |
title_fullStr |
Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands |
title_full_unstemmed |
Population genetics of the Antarctic heteronemertean Parbolasia corrugatus from the South Orkney Islands |
title_sort |
population genetics of the antarctic heteronemertean parbolasia corrugatus from the south orkney islands |
publisher |
Springer Verlag |
publishDate |
2016 |
url |
https://doi.org/10.1007/s002270050290 https://ora.ox.ac.uk/objects/uuid:5591f16e-6e5a-448f-9859-74a922867d24 |
long_lat |
ENVELOPE(168.683,168.683,-77.517,-77.517) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic Antarctic Peninsula McIntosh South Orkney Islands The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula McIntosh South Orkney Islands The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica South Orkney Islands Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica South Orkney Islands Weddell Sea |
op_relation |
doi:10.1007/s002270050290 https://ora.ox.ac.uk/objects/uuid:5591f16e-6e5a-448f-9859-74a922867d24 https://doi.org/10.1007/s002270050290 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1007/s002270050290 |
container_title |
Marine Biology |
container_volume |
131 |
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1 |
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1 |
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13 |
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1811639849365536768 |