Sex allocation and sex‐specific parental investment in an endangered seabird
Biased offspring sex ratio is relatively rare in birds and sex allocation can vary with environmental conditions, with the larger and more costly sex, which can be either the male or female depending on species, favoured during high food availability. Sex‐specific parental investment may lead to bia...
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Online Access: | http://dx.doi.org/10.1111/ibi.12457 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fibi.12457 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12457 |
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crwiley:10.1111/ibi.12457 2024-06-02T08:04:27+00:00 Sex allocation and sex‐specific parental investment in an endangered seabird Spelt, Anouk Pichegru, Lorien 2017 http://dx.doi.org/10.1111/ibi.12457 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fibi.12457 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12457 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 159, issue 2, page 272-284 ISSN 0019-1019 1474-919X journal-article 2017 crwiley https://doi.org/10.1111/ibi.12457 2024-05-03T11:38:08Z Biased offspring sex ratio is relatively rare in birds and sex allocation can vary with environmental conditions, with the larger and more costly sex, which can be either the male or female depending on species, favoured during high food availability. Sex‐specific parental investment may lead to biased mortality and, coupled with unequal production of one sex, may result in biased adult sex ratio, with potential grave consequences on population stability. The African Penguin Spheniscus demersus , endemic to southern Africa, is an endangered monogamous seabird with bi‐parental care. Female adult African Penguins are smaller, have a higher foraging effort when breeding and higher mortality compared with adult males. In 2015, a year in which environmental conditions were favourable for breeding, African Penguin chick production on Bird Island, Algoa Bay, South Africa, was skewed towards males (1.5 males to 1 female). Males also had higher growth rates and fledging mass than females, with potentially higher post‐fledging survival. Female, but not male, parents had higher foraging effort and lower body condition with increasing number of male chicks in their brood, thereby revealing flexibility in their parental strategy, but also the costs of their investment in their current brood. The combination of male‐biased chick production and higher female mortality, possibly at the juvenile stage as a result of lower parental investment in female chicks, and/or at the adult stage as a result of higher parental investment, may contribute to a biased adult sex ratio ( ASR ) in this species. While further research during years of contrasting food availability is needed to confirm this trend, populations with male‐skewed ASR s have higher extinction risks and conservation strategies aiming to benefit female African Penguin might need to be developed. Article in Journal/Newspaper Bird Island Wiley Online Library Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Ibis 159 2 272 284 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Biased offspring sex ratio is relatively rare in birds and sex allocation can vary with environmental conditions, with the larger and more costly sex, which can be either the male or female depending on species, favoured during high food availability. Sex‐specific parental investment may lead to biased mortality and, coupled with unequal production of one sex, may result in biased adult sex ratio, with potential grave consequences on population stability. The African Penguin Spheniscus demersus , endemic to southern Africa, is an endangered monogamous seabird with bi‐parental care. Female adult African Penguins are smaller, have a higher foraging effort when breeding and higher mortality compared with adult males. In 2015, a year in which environmental conditions were favourable for breeding, African Penguin chick production on Bird Island, Algoa Bay, South Africa, was skewed towards males (1.5 males to 1 female). Males also had higher growth rates and fledging mass than females, with potentially higher post‐fledging survival. Female, but not male, parents had higher foraging effort and lower body condition with increasing number of male chicks in their brood, thereby revealing flexibility in their parental strategy, but also the costs of their investment in their current brood. The combination of male‐biased chick production and higher female mortality, possibly at the juvenile stage as a result of lower parental investment in female chicks, and/or at the adult stage as a result of higher parental investment, may contribute to a biased adult sex ratio ( ASR ) in this species. While further research during years of contrasting food availability is needed to confirm this trend, populations with male‐skewed ASR s have higher extinction risks and conservation strategies aiming to benefit female African Penguin might need to be developed. |
format |
Article in Journal/Newspaper |
author |
Spelt, Anouk Pichegru, Lorien |
spellingShingle |
Spelt, Anouk Pichegru, Lorien Sex allocation and sex‐specific parental investment in an endangered seabird |
author_facet |
Spelt, Anouk Pichegru, Lorien |
author_sort |
Spelt, Anouk |
title |
Sex allocation and sex‐specific parental investment in an endangered seabird |
title_short |
Sex allocation and sex‐specific parental investment in an endangered seabird |
title_full |
Sex allocation and sex‐specific parental investment in an endangered seabird |
title_fullStr |
Sex allocation and sex‐specific parental investment in an endangered seabird |
title_full_unstemmed |
Sex allocation and sex‐specific parental investment in an endangered seabird |
title_sort |
sex allocation and sex‐specific parental investment in an endangered seabird |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/ibi.12457 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fibi.12457 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12457 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Bird Island |
geographic_facet |
Bird Island |
genre |
Bird Island |
genre_facet |
Bird Island |
op_source |
Ibis volume 159, issue 2, page 272-284 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/ibi.12457 |
container_title |
Ibis |
container_volume |
159 |
container_issue |
2 |
container_start_page |
272 |
op_container_end_page |
284 |
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1800749076993540096 |