Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins
The differential environmental sensitivity of the sexes has strong implications in the evolutionary history of species as it can alter sexual size dimorphism, population sex ratios, and the faculty of parents to manipulate offspring sex in relation to environmental conditions. We studied sexual diff...
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fthighwire:oai:open-archive.highwire.org:beheco:arl007v1 2023-05-15T13:57:29+02:00 Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins Fargallo, Juan A. Polo, Vicente de Neve, Liesbeth Martín, José Dávila, José A. Soler, Manuel 2006-06-06 09:52:53.0 text/html http://beheco.oxfordjournals.org/cgi/content/short/arl007v1 https://doi.org/10.1093/beheco/arl007 en eng Oxford University Press http://beheco.oxfordjournals.org/cgi/content/short/arl007v1 http://dx.doi.org/10.1093/beheco/arl007 Copyright (C) 2006, International Society for Behavioral Ecology Review TEXT 2006 fthighwire https://doi.org/10.1093/beheco/arl007 2016-11-16T18:36:11Z The differential environmental sensitivity of the sexes has strong implications in the evolutionary history of species as it can alter sexual size dimorphism, population sex ratios, and the faculty of parents to manipulate offspring sex in relation to environmental conditions. We studied sexual differences in hatching patterns and evaluated sex- and size-related mortality in relation to hatching order and brood sex ratios in the chinstrap penguin Pygoscelis antarctica , a moderately size-dimorphic species, with a modal clutch size of 2 eggs. We found that male, second-hatched, and large eggs showed shorter hatching periods than female, first-hatched, and small eggs. We also found a male-biased mortality of nestlings in the colony. However, male mortality patterns differed depending on the brood sex ratio composition. Mortality of male chicks in all-male broods was higher than in mixed broods and higher than female mortality in all-female broods. Contrary, females from mixed brood showed higher mortality than their male nest mates and higher too than females in all-female broods. Second-hatched chicks also suffered from higher mortality than first-hatched chicks. Our results indicate that both the superior competitive capacity and the higher energy demand of the larger sex constitute 2 causal factors explaining patterns of sex-biased mortality. Both factors occur in the same species and in different situations of sibling competition shaped by brood sex ratio composition. This study constitutes a good example of how patterns of sex-related mortality can vary depending on nest environmental circumstances. Furthermore, our study suggests that hatching period can be a mechanism underlying sexual differences in the embryonic period of birds. Text Antarc* Antarctica Chinstrap penguin Pygoscelis antarctica HighWire Press (Stanford University) Behavioral Ecology 17 5 772 778 |
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Review Fargallo, Juan A. Polo, Vicente de Neve, Liesbeth Martín, José Dávila, José A. Soler, Manuel Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins |
topic_facet |
Review |
description |
The differential environmental sensitivity of the sexes has strong implications in the evolutionary history of species as it can alter sexual size dimorphism, population sex ratios, and the faculty of parents to manipulate offspring sex in relation to environmental conditions. We studied sexual differences in hatching patterns and evaluated sex- and size-related mortality in relation to hatching order and brood sex ratios in the chinstrap penguin Pygoscelis antarctica , a moderately size-dimorphic species, with a modal clutch size of 2 eggs. We found that male, second-hatched, and large eggs showed shorter hatching periods than female, first-hatched, and small eggs. We also found a male-biased mortality of nestlings in the colony. However, male mortality patterns differed depending on the brood sex ratio composition. Mortality of male chicks in all-male broods was higher than in mixed broods and higher than female mortality in all-female broods. Contrary, females from mixed brood showed higher mortality than their male nest mates and higher too than females in all-female broods. Second-hatched chicks also suffered from higher mortality than first-hatched chicks. Our results indicate that both the superior competitive capacity and the higher energy demand of the larger sex constitute 2 causal factors explaining patterns of sex-biased mortality. Both factors occur in the same species and in different situations of sibling competition shaped by brood sex ratio composition. This study constitutes a good example of how patterns of sex-related mortality can vary depending on nest environmental circumstances. Furthermore, our study suggests that hatching period can be a mechanism underlying sexual differences in the embryonic period of birds. |
format |
Text |
author |
Fargallo, Juan A. Polo, Vicente de Neve, Liesbeth Martín, José Dávila, José A. Soler, Manuel |
author_facet |
Fargallo, Juan A. Polo, Vicente de Neve, Liesbeth Martín, José Dávila, José A. Soler, Manuel |
author_sort |
Fargallo, Juan A. |
title |
Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins |
title_short |
Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins |
title_full |
Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins |
title_fullStr |
Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins |
title_full_unstemmed |
Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins |
title_sort |
hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins |
publisher |
Oxford University Press |
publishDate |
2006 |
url |
http://beheco.oxfordjournals.org/cgi/content/short/arl007v1 https://doi.org/10.1093/beheco/arl007 |
genre |
Antarc* Antarctica Chinstrap penguin Pygoscelis antarctica |
genre_facet |
Antarc* Antarctica Chinstrap penguin Pygoscelis antarctica |
op_relation |
http://beheco.oxfordjournals.org/cgi/content/short/arl007v1 http://dx.doi.org/10.1093/beheco/arl007 |
op_rights |
Copyright (C) 2006, International Society for Behavioral Ecology |
op_doi |
https://doi.org/10.1093/beheco/arl007 |
container_title |
Behavioral Ecology |
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17 |
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5 |
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772 |
op_container_end_page |
778 |
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1766265152684949504 |