Sex Ratio Bias at Hatching and Fledging in the Roseate Tern
Abstract Several hypotheses have been proposed to explain facultative manipulation of sex ratios in birds, but existing data are inconsistent within and among species, and do not clearly support any one of the hypotheses. The sex ratio among breeding Roseate Terns (Sterna dougallii) at Bird Island,...
Published in: | The Condor |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2001
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/condor/103.2.385 http://academic.oup.com/condor/article-pdf/103/2/385/29710873/condor0385.pdf |
id |
croxfordunivpr:10.1093/condor/103.2.385 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/condor/103.2.385 2023-05-15T15:44:42+02:00 Sex Ratio Bias at Hatching and Fledging in the Roseate Tern Szczys, Patricia Nisbet, Ian C. T. Hatch, Jeremy J. Kesseli, Richard V. 2001 http://dx.doi.org/10.1093/condor/103.2.385 http://academic.oup.com/condor/article-pdf/103/2/385/29710873/condor0385.pdf en eng Oxford University Press (OUP) The Condor volume 103, issue 2, page 385-389 ISSN 0010-5422 1938-5129 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2001 croxfordunivpr https://doi.org/10.1093/condor/103.2.385 2022-06-16T13:03:03Z Abstract Several hypotheses have been proposed to explain facultative manipulation of sex ratios in birds, but existing data are inconsistent within and among species, and do not clearly support any one of the hypotheses. The sex ratio among breeding Roseate Terns (Sterna dougallii) at Bird Island, Massachusetts is female-biased (56%). We sought to determine at what stage of the life cycle this sex ratio bias is established. We monitored 461 eggs from 252 nests and, using molecular markers, we sexed 342 chicks at hatching and followed them to a stage when survival (or non-survival) to fledging could be inferred. We found that the sex ratio at hatching (and, by inference, at fertilization) was biased toward females (55%). This bias was significant in chicks from first-laid eggs (58%) but not second-laid eggs (48%). We also found that the overall bias increased (to 56.6%) during the chick stage through differential loss of male chicks. Article in Journal/Newspaper Bird Island Oxford University Press (via Crossref) Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) The Condor 103 2 385 389 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Szczys, Patricia Nisbet, Ian C. T. Hatch, Jeremy J. Kesseli, Richard V. Sex Ratio Bias at Hatching and Fledging in the Roseate Tern |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract Several hypotheses have been proposed to explain facultative manipulation of sex ratios in birds, but existing data are inconsistent within and among species, and do not clearly support any one of the hypotheses. The sex ratio among breeding Roseate Terns (Sterna dougallii) at Bird Island, Massachusetts is female-biased (56%). We sought to determine at what stage of the life cycle this sex ratio bias is established. We monitored 461 eggs from 252 nests and, using molecular markers, we sexed 342 chicks at hatching and followed them to a stage when survival (or non-survival) to fledging could be inferred. We found that the sex ratio at hatching (and, by inference, at fertilization) was biased toward females (55%). This bias was significant in chicks from first-laid eggs (58%) but not second-laid eggs (48%). We also found that the overall bias increased (to 56.6%) during the chick stage through differential loss of male chicks. |
format |
Article in Journal/Newspaper |
author |
Szczys, Patricia Nisbet, Ian C. T. Hatch, Jeremy J. Kesseli, Richard V. |
author_facet |
Szczys, Patricia Nisbet, Ian C. T. Hatch, Jeremy J. Kesseli, Richard V. |
author_sort |
Szczys, Patricia |
title |
Sex Ratio Bias at Hatching and Fledging in the Roseate Tern |
title_short |
Sex Ratio Bias at Hatching and Fledging in the Roseate Tern |
title_full |
Sex Ratio Bias at Hatching and Fledging in the Roseate Tern |
title_fullStr |
Sex Ratio Bias at Hatching and Fledging in the Roseate Tern |
title_full_unstemmed |
Sex Ratio Bias at Hatching and Fledging in the Roseate Tern |
title_sort |
sex ratio bias at hatching and fledging in the roseate tern |
publisher |
Oxford University Press (OUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1093/condor/103.2.385 http://academic.oup.com/condor/article-pdf/103/2/385/29710873/condor0385.pdf |
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 |
The Condor volume 103, issue 2, page 385-389 ISSN 0010-5422 1938-5129 |
op_doi |
https://doi.org/10.1093/condor/103.2.385 |
container_title |
The Condor |
container_volume |
103 |
container_issue |
2 |
container_start_page |
385 |
op_container_end_page |
389 |
_version_ |
1766379072816939008 |