Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism.
Adaptive sex-ratio theory predicts that parents should overproduce the more beneficial offspring sex. Based on a recent experimental study of lesser black-backed gulls, we tested this hypothesis with the great skua, Catharacta skua , a bird species closely related to gulls but where females are the...
Published in: | Proceedings of the Royal Society of London. Series B: Biological Sciences |
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The Royal Society
2001
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Online Access: | https://eprints.gla.ac.uk/4233/ https://doi.org/10.1098/rspb.2001.1793 |
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ftuglasgow:oai:eprints.gla.ac.uk:4233 2023-05-15T15:53:39+02:00 Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. Kalmbach, E. Nager, R.G. Griffiths, R. Furness, R.W. 2001-10 https://eprints.gla.ac.uk/4233/ https://doi.org/10.1098/rspb.2001.1793 unknown The Royal Society Kalmbach, E., Nager, R.G., Griffiths, R. and Furness, R.W. <http://eprints.gla.ac.uk/view/author/11403.html> (2001) Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. Proceedings of the Royal Society of London Series B: Biological Sciences <https://eprints.gla.ac.uk/view/journal_volume/Proceedings_of_the_Royal_Society_of_London_Series_B=3A_Biological_Sciences.html>, 268(1481), pp. 2175-2179. (doi:10.1098/rspb.2001.1793 <https://doi.org/10.1098/rspb.2001.1793>) QL Zoology GE Environmental Sciences Articles PeerReviewed 2001 ftuglasgow https://doi.org/10.1098/rspb.2001.1793 2022-09-22T22:09:03Z Adaptive sex-ratio theory predicts that parents should overproduce the more beneficial offspring sex. Based on a recent experimental study of lesser black-backed gulls, we tested this hypothesis with the great skua, Catharacta skua , a bird species closely related to gulls but where females are the larger sex. When in poor body condition, the gulls overproduced daughters, the smaller and more viable sex under those circumstances. To discriminate between a mandatory physiological overproduction of female (i.e. non-male) eggs versus the overproduction of the smaller and presumably more viable sex, we conducted an egg-removal experiment with the great skua. Since the males are smaller, larger size and being male are separated. Through egg removal we induced females to increase egg production effort. Eggs were sexed using a DNA-based technique. Manipulated pairs produced a significant male bias at the end of the extended laying sequence, while the sex ratio in the control group did not differ from unity. Our results present an example of facultative sex-ratio manipulation and support the hypothesis that in sexually dimorphic birds parents overproduce the smaller sex under adverse conditions. Article in Journal/Newspaper Catharacta skua Great skua University of Glasgow: Enlighten - Publications Proceedings of the Royal Society of London. Series B: Biological Sciences 268 1481 2175 2179 |
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University of Glasgow: Enlighten - Publications |
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ftuglasgow |
language |
unknown |
topic |
QL Zoology GE Environmental Sciences |
spellingShingle |
QL Zoology GE Environmental Sciences Kalmbach, E. Nager, R.G. Griffiths, R. Furness, R.W. Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. |
topic_facet |
QL Zoology GE Environmental Sciences |
description |
Adaptive sex-ratio theory predicts that parents should overproduce the more beneficial offspring sex. Based on a recent experimental study of lesser black-backed gulls, we tested this hypothesis with the great skua, Catharacta skua , a bird species closely related to gulls but where females are the larger sex. When in poor body condition, the gulls overproduced daughters, the smaller and more viable sex under those circumstances. To discriminate between a mandatory physiological overproduction of female (i.e. non-male) eggs versus the overproduction of the smaller and presumably more viable sex, we conducted an egg-removal experiment with the great skua. Since the males are smaller, larger size and being male are separated. Through egg removal we induced females to increase egg production effort. Eggs were sexed using a DNA-based technique. Manipulated pairs produced a significant male bias at the end of the extended laying sequence, while the sex ratio in the control group did not differ from unity. Our results present an example of facultative sex-ratio manipulation and support the hypothesis that in sexually dimorphic birds parents overproduce the smaller sex under adverse conditions. |
format |
Article in Journal/Newspaper |
author |
Kalmbach, E. Nager, R.G. Griffiths, R. Furness, R.W. |
author_facet |
Kalmbach, E. Nager, R.G. Griffiths, R. Furness, R.W. |
author_sort |
Kalmbach, E. |
title |
Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. |
title_short |
Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. |
title_full |
Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. |
title_fullStr |
Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. |
title_full_unstemmed |
Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. |
title_sort |
increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. |
publisher |
The Royal Society |
publishDate |
2001 |
url |
https://eprints.gla.ac.uk/4233/ https://doi.org/10.1098/rspb.2001.1793 |
genre |
Catharacta skua Great skua |
genre_facet |
Catharacta skua Great skua |
op_relation |
Kalmbach, E., Nager, R.G., Griffiths, R. and Furness, R.W. <http://eprints.gla.ac.uk/view/author/11403.html> (2001) Increased reproductive effort results in male-biased offspring sex ratio: an experimental study in a species with reversed sexual size dimorphism. Proceedings of the Royal Society of London Series B: Biological Sciences <https://eprints.gla.ac.uk/view/journal_volume/Proceedings_of_the_Royal_Society_of_London_Series_B=3A_Biological_Sciences.html>, 268(1481), pp. 2175-2179. (doi:10.1098/rspb.2001.1793 <https://doi.org/10.1098/rspb.2001.1793>) |
op_doi |
https://doi.org/10.1098/rspb.2001.1793 |
container_title |
Proceedings of the Royal Society of London. Series B: Biological Sciences |
container_volume |
268 |
container_issue |
1481 |
container_start_page |
2175 |
op_container_end_page |
2179 |
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1766388764346679296 |