Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds.
Hybridization in natural populations provides an opportunity to study the evolutionary processes that shape divergence and genetic isolation of species. The emergence of pre-mating barriers is often the precursor to complete reproductive isolation. However, in recently diverged species, pre-mating b...
Published in: | PLOS ONE |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Public Library of Science (PLoS)
2015
|
Subjects: | |
Online Access: | https://doi.org/10.1371/journal.pone.0121688 https://doaj.org/article/408ab4f0d2ca4276a6a7da19148fdcb3 |
id |
ftdoajarticles:oai:doaj.org/article:408ab4f0d2ca4276a6a7da19148fdcb3 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:408ab4f0d2ca4276a6a7da19148fdcb3 2023-05-15T15:44:39+02:00 Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds. Ruth M Brown N M S Mareile Techow Andrew G Wood Richard A Phillips 2015-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0121688 https://doaj.org/article/408ab4f0d2ca4276a6a7da19148fdcb3 EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pone.0121688 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0121688 https://doaj.org/article/408ab4f0d2ca4276a6a7da19148fdcb3 PLoS ONE, Vol 10, Iss 3, p e0121688 (2015) Medicine R Science Q article 2015 ftdoajarticles https://doi.org/10.1371/journal.pone.0121688 2022-12-31T05:03:20Z Hybridization in natural populations provides an opportunity to study the evolutionary processes that shape divergence and genetic isolation of species. The emergence of pre-mating barriers is often the precursor to complete reproductive isolation. However, in recently diverged species, pre-mating barriers may be incomplete, leading to hybridization between seemingly distinct taxa. Here we report results of a long-term study at Bird Island, South Georgia, of the extent of hybridization, mate fidelity, timing of breeding and breeding success in mixed and conspecific pairs of the sibling species, Macronectes halli (northern giant petrel) and M. giganteus (southern giant petrel). The proportion of mixed-species pairs varied annually from 0.4-2.4% (mean of 1.5%), and showed no linear trend with time. Mean laying date in mixed-species pairs tended to be later than in northern giant petrel, and always earlier than in southern giant petrel pairs, and their breeding success (15.6%) was lower than that of conspecific pairs. By comparison, mixed-species pairs at both Marion and Macquarie islands always failed before hatching. Histories of birds in mixed-species pairs at Bird Island were variable; some bred previously or subsequently with a conspecific partner, others subsequently with a different allospecific partner, and some mixed-species pairs remained together for multiple seasons. We also report the first verified back-crossing of a hybrid giant petrel with a female northern giant petrel. We discuss the potential causes and evolutionary consequences of hybridization and back-crossing in giant petrels and summarize the incidence of back-crossing in other seabird species. Article in Journal/Newspaper Bird Island Giant Petrel Giant Petrels Macronectes giganteus Directory of Open Access Journals: DOAJ Articles Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Giganteus ENVELOPE(62.500,62.500,-67.567,-67.567) PLOS ONE 10 3 e0121688 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Ruth M Brown N M S Mareile Techow Andrew G Wood Richard A Phillips Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds. |
topic_facet |
Medicine R Science Q |
description |
Hybridization in natural populations provides an opportunity to study the evolutionary processes that shape divergence and genetic isolation of species. The emergence of pre-mating barriers is often the precursor to complete reproductive isolation. However, in recently diverged species, pre-mating barriers may be incomplete, leading to hybridization between seemingly distinct taxa. Here we report results of a long-term study at Bird Island, South Georgia, of the extent of hybridization, mate fidelity, timing of breeding and breeding success in mixed and conspecific pairs of the sibling species, Macronectes halli (northern giant petrel) and M. giganteus (southern giant petrel). The proportion of mixed-species pairs varied annually from 0.4-2.4% (mean of 1.5%), and showed no linear trend with time. Mean laying date in mixed-species pairs tended to be later than in northern giant petrel, and always earlier than in southern giant petrel pairs, and their breeding success (15.6%) was lower than that of conspecific pairs. By comparison, mixed-species pairs at both Marion and Macquarie islands always failed before hatching. Histories of birds in mixed-species pairs at Bird Island were variable; some bred previously or subsequently with a conspecific partner, others subsequently with a different allospecific partner, and some mixed-species pairs remained together for multiple seasons. We also report the first verified back-crossing of a hybrid giant petrel with a female northern giant petrel. We discuss the potential causes and evolutionary consequences of hybridization and back-crossing in giant petrels and summarize the incidence of back-crossing in other seabird species. |
format |
Article in Journal/Newspaper |
author |
Ruth M Brown N M S Mareile Techow Andrew G Wood Richard A Phillips |
author_facet |
Ruth M Brown N M S Mareile Techow Andrew G Wood Richard A Phillips |
author_sort |
Ruth M Brown |
title |
Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds. |
title_short |
Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds. |
title_full |
Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds. |
title_fullStr |
Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds. |
title_full_unstemmed |
Hybridization and back-crossing in giant petrels (Macronectes giganteus and M. halli) at Bird Island, South Georgia, and a summary of hybridization in seabirds. |
title_sort |
hybridization and back-crossing in giant petrels (macronectes giganteus and m. halli) at bird island, south georgia, and a summary of hybridization in seabirds. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2015 |
url |
https://doi.org/10.1371/journal.pone.0121688 https://doaj.org/article/408ab4f0d2ca4276a6a7da19148fdcb3 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(62.500,62.500,-67.567,-67.567) |
geographic |
Bird Island Giganteus |
geographic_facet |
Bird Island Giganteus |
genre |
Bird Island Giant Petrel Giant Petrels Macronectes giganteus |
genre_facet |
Bird Island Giant Petrel Giant Petrels Macronectes giganteus |
op_source |
PLoS ONE, Vol 10, Iss 3, p e0121688 (2015) |
op_relation |
https://doi.org/10.1371/journal.pone.0121688 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0121688 https://doaj.org/article/408ab4f0d2ca4276a6a7da19148fdcb3 |
op_doi |
https://doi.org/10.1371/journal.pone.0121688 |
container_title |
PLOS ONE |
container_volume |
10 |
container_issue |
3 |
container_start_page |
e0121688 |
_version_ |
1766379039576031232 |