Twinning and fetal sex ratio in moose: effects of maternal age and mass
To evaluate hypotheses concerning the effects of maternal characteristics on litter size and offspring sex ratio in a polygynous mammal, we examined how female age and mass affected the number and sex ratio of fetuses in moose (Alces alces). We analysed 420 fetuses collected from 297 females killed...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
1997
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Online Access: | http://dx.doi.org/10.1139/z97-825 http://www.nrcresearchpress.com/doi/pdf/10.1139/z97-825 |
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crcansciencepubl:10.1139/z97-825 2024-04-07T07:45:58+00:00 Twinning and fetal sex ratio in moose: effects of maternal age and mass Nygrén, T. Kojola, I. 1997 http://dx.doi.org/10.1139/z97-825 http://www.nrcresearchpress.com/doi/pdf/10.1139/z97-825 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 75, issue 11, page 1945-1948 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1997 crcansciencepubl https://doi.org/10.1139/z97-825 2024-03-08T00:37:47Z To evaluate hypotheses concerning the effects of maternal characteristics on litter size and offspring sex ratio in a polygynous mammal, we examined how female age and mass affected the number and sex ratio of fetuses in moose (Alces alces). We analysed 420 fetuses collected from 297 females killed in Finland. Females that carried two fetuses were older than females with one fetus, while mass did not affect litter size. Sex ratio was not conclusively linked with maternal quality. The overall lack of difference in the sex ratio (no male bias among fetuses carried by the heaviest females) can be explained by the rather low degree of polygyny and the lack of intense female – female competition for a limited food supply (no female bias among fetuses carried by the heaviest females). Article in Journal/Newspaper Alces alces Canadian Science Publishing Canadian Journal of Zoology 75 11 1945 1948 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Nygrén, T. Kojola, I. Twinning and fetal sex ratio in moose: effects of maternal age and mass |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
To evaluate hypotheses concerning the effects of maternal characteristics on litter size and offspring sex ratio in a polygynous mammal, we examined how female age and mass affected the number and sex ratio of fetuses in moose (Alces alces). We analysed 420 fetuses collected from 297 females killed in Finland. Females that carried two fetuses were older than females with one fetus, while mass did not affect litter size. Sex ratio was not conclusively linked with maternal quality. The overall lack of difference in the sex ratio (no male bias among fetuses carried by the heaviest females) can be explained by the rather low degree of polygyny and the lack of intense female – female competition for a limited food supply (no female bias among fetuses carried by the heaviest females). |
format |
Article in Journal/Newspaper |
author |
Nygrén, T. Kojola, I. |
author_facet |
Nygrén, T. Kojola, I. |
author_sort |
Nygrén, T. |
title |
Twinning and fetal sex ratio in moose: effects of maternal age and mass |
title_short |
Twinning and fetal sex ratio in moose: effects of maternal age and mass |
title_full |
Twinning and fetal sex ratio in moose: effects of maternal age and mass |
title_fullStr |
Twinning and fetal sex ratio in moose: effects of maternal age and mass |
title_full_unstemmed |
Twinning and fetal sex ratio in moose: effects of maternal age and mass |
title_sort |
twinning and fetal sex ratio in moose: effects of maternal age and mass |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/z97-825 http://www.nrcresearchpress.com/doi/pdf/10.1139/z97-825 |
genre |
Alces alces |
genre_facet |
Alces alces |
op_source |
Canadian Journal of Zoology volume 75, issue 11, page 1945-1948 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z97-825 |
container_title |
Canadian Journal of Zoology |
container_volume |
75 |
container_issue |
11 |
container_start_page |
1945 |
op_container_end_page |
1948 |
_version_ |
1795675038083448832 |