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...
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ftunivcapetownir:oai:localhost:11427/14934 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 Brown, Ruth M Techow, N M S Mareile Wood, Andrew G Phillips, Richard A 2015 application/pdf http://hdl.handle.net/11427/14934 https://doi.org/10.1371/journal.pone.0121688 https://open.uct.ac.za/bitstream/11427/14934/1/Brown_Hybridization_and_Back_Crossing_2015.pdf eng eng Public Library of Science University of Cape Town Faculty of Science Percy FitzPatrick Institute of African Ornithology http://hdl.handle.net/11427/14934 http://dx.doi.org/10.1371/journal.pone.0121688 https://open.uct.ac.za/bitstream/11427/14934/1/Brown_Hybridization_and_Back_Crossing_2015.pdf This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. http://creativecommons.org/licenses/by/4.0 © 2015 Brown et al CC-BY PLoS One http://journals.plos.org/plosone Petrels Hybridization Mitochondrial DNA Population genetics Journal Article 2015 ftunivcapetownir https://doi.org/10.1371/journal.pone.0121688 2022-09-13T05:56:15Z 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 University of Cape Town: OpenUCT 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 |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
topic |
Petrels Hybridization Mitochondrial DNA Population genetics |
spellingShingle |
Petrels Hybridization Mitochondrial DNA Population genetics Brown, Ruth M Techow, N M S Mareile Wood, Andrew G Phillips, Richard A 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 |
Petrels Hybridization Mitochondrial DNA Population genetics |
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 |
Brown, Ruth M Techow, N M S Mareile Wood, Andrew G Phillips, Richard A |
author_facet |
Brown, Ruth M Techow, N M S Mareile Wood, Andrew G Phillips, Richard A |
author_sort |
Brown, Ruth M |
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 |
publishDate |
2015 |
url |
http://hdl.handle.net/11427/14934 https://doi.org/10.1371/journal.pone.0121688 https://open.uct.ac.za/bitstream/11427/14934/1/Brown_Hybridization_and_Back_Crossing_2015.pdf |
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 http://journals.plos.org/plosone |
op_relation |
http://hdl.handle.net/11427/14934 http://dx.doi.org/10.1371/journal.pone.0121688 https://open.uct.ac.za/bitstream/11427/14934/1/Brown_Hybridization_and_Back_Crossing_2015.pdf |
op_rights |
This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. http://creativecommons.org/licenses/by/4.0 © 2015 Brown et al |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0121688 |
container_title |
PLOS ONE |
container_volume |
10 |
container_issue |
3 |
container_start_page |
e0121688 |
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1766379038450909184 |