Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii)
We used microsatellite genotyping to determine the genetic relatedness of 7 apparent twin dyads of Weddell seals ( Leptonychotes weddellii ) born in McMurdo Sound, Antarctica. Genetic evidence for twinning in wild pinnipeds has not been reported previously. A review of 14 years of demographic data c...
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fthighwire:oai:open-archive.highwire.org:jmammal:82/2/491 2023-05-15T13:53:11+02:00 Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii) Gelatt, Thomas S. Davis, Corey S. Siniff, Donald B. Strobeck, Curtis 2001-05-01 00:00:00.0 text/html http://jmammal.oxfordjournals.org/cgi/content/short/82/2/491 https://doi.org/10.1644/1545-1542(2001)082<0491:MEFTIW>2.0.CO;2 en eng Oxford University Press http://jmammal.oxfordjournals.org/cgi/content/short/82/2/491 http://dx.doi.org/10.1644/1545-1542(2001)082<0491:MEFTIW>2.0.CO;2 Copyright (C) 2001, Oxford University Press Feature Articles TEXT 2001 fthighwire https://doi.org/10.1644/1545-1542(2001)082<0491:MEFTIW>2.0.CO;2 2016-11-16T16:51:47Z We used microsatellite genotyping to determine the genetic relatedness of 7 apparent twin dyads of Weddell seals ( Leptonychotes weddellii ) born in McMurdo Sound, Antarctica. Genetic evidence for twinning in wild pinnipeds has not been reported previously. A review of 14 years of demographic data combined with pathological exams, behavioral observations, and molecular genetic evidence suggests that twinning is extremely rare in Weddell seals and that females do not wean both pups in the wild. The incidence of live twin births was about 0.1% (2/1,439 births), recorded over 3 seasons in Erebus Bay, McMurdo Sound. Additionally, a single case of true twinning was documented from 23 known pregnancies observed in an isolated population of Weddell seals located within McMurdo Sound. The 3 twin sets were dizygotic full siblings, 1 nontwin dyad represented a case of adoption, and the 3 remaining putative twin sets were identified as instances of foster nursing. These results indicated that observation of mother–offspring behavior was not a reliable method for identifying a twin birth in this species. Use of genetic techniques to verify presence of twins in species with low or unknown twinning rates offers the opportunity for a refinement of estimates in studies of reproductive success, fostering behavior, and adoption. Text Antarc* Antarctica McMurdo Sound Weddell Seals HighWire Press (Stanford University) McMurdo Sound Weddell Erebus Bay ENVELOPE(166.517,166.517,-77.733,-77.733) |
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HighWire Press (Stanford University) |
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English |
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Feature Articles |
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Feature Articles Gelatt, Thomas S. Davis, Corey S. Siniff, Donald B. Strobeck, Curtis Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii) |
topic_facet |
Feature Articles |
description |
We used microsatellite genotyping to determine the genetic relatedness of 7 apparent twin dyads of Weddell seals ( Leptonychotes weddellii ) born in McMurdo Sound, Antarctica. Genetic evidence for twinning in wild pinnipeds has not been reported previously. A review of 14 years of demographic data combined with pathological exams, behavioral observations, and molecular genetic evidence suggests that twinning is extremely rare in Weddell seals and that females do not wean both pups in the wild. The incidence of live twin births was about 0.1% (2/1,439 births), recorded over 3 seasons in Erebus Bay, McMurdo Sound. Additionally, a single case of true twinning was documented from 23 known pregnancies observed in an isolated population of Weddell seals located within McMurdo Sound. The 3 twin sets were dizygotic full siblings, 1 nontwin dyad represented a case of adoption, and the 3 remaining putative twin sets were identified as instances of foster nursing. These results indicated that observation of mother–offspring behavior was not a reliable method for identifying a twin birth in this species. Use of genetic techniques to verify presence of twins in species with low or unknown twinning rates offers the opportunity for a refinement of estimates in studies of reproductive success, fostering behavior, and adoption. |
format |
Text |
author |
Gelatt, Thomas S. Davis, Corey S. Siniff, Donald B. Strobeck, Curtis |
author_facet |
Gelatt, Thomas S. Davis, Corey S. Siniff, Donald B. Strobeck, Curtis |
author_sort |
Gelatt, Thomas S. |
title |
Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii) |
title_short |
Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii) |
title_full |
Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii) |
title_fullStr |
Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii) |
title_full_unstemmed |
Molecular Evidence for Twinning in Weddell Seals (Leptonychotes Weddellii) |
title_sort |
molecular evidence for twinning in weddell seals (leptonychotes weddellii) |
publisher |
Oxford University Press |
publishDate |
2001 |
url |
http://jmammal.oxfordjournals.org/cgi/content/short/82/2/491 https://doi.org/10.1644/1545-1542(2001)082<0491:MEFTIW>2.0.CO;2 |
long_lat |
ENVELOPE(166.517,166.517,-77.733,-77.733) |
geographic |
McMurdo Sound Weddell Erebus Bay |
geographic_facet |
McMurdo Sound Weddell Erebus Bay |
genre |
Antarc* Antarctica McMurdo Sound Weddell Seals |
genre_facet |
Antarc* Antarctica McMurdo Sound Weddell Seals |
op_relation |
http://jmammal.oxfordjournals.org/cgi/content/short/82/2/491 http://dx.doi.org/10.1644/1545-1542(2001)082<0491:MEFTIW>2.0.CO;2 |
op_rights |
Copyright (C) 2001, Oxford University Press |
op_doi |
https://doi.org/10.1644/1545-1542(2001)082<0491:MEFTIW>2.0.CO;2 |
_version_ |
1766258160088121344 |