The eVects of primiparity on reproductive performance in the brown bear
Abstract We studied the eVects of primiparity on litter size, oVspring size, and cub loss in brown bears (Ursus arctos) in two study areas (north, south) in Sweden from 1987 to 2006. Sexually selected infanticide (SSI) has been suggested previously as a mortality factor in our study populations. Fem...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1072.3232 2023-05-15T18:42:09+02:00 The eVects of primiparity on reproductive performance in the brown bear Andreas Zedrosser Bjørn Dahle Ole-Gunnar Støen Jon E Swenson The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.3232 http://bearproject.info/wp-content/uploads/2014/07/2009-Zedrosser-et-al-primiparity-Oecologia.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.3232 http://bearproject.info/wp-content/uploads/2014/07/2009-Zedrosser-et-al-primiparity-Oecologia.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://bearproject.info/wp-content/uploads/2014/07/2009-Zedrosser-et-al-primiparity-Oecologia.pdf text 2009 ftciteseerx 2020-04-26T00:24:00Z Abstract We studied the eVects of primiparity on litter size, oVspring size, and cub loss in brown bears (Ursus arctos) in two study areas (north, south) in Sweden from 1987 to 2006. Sexually selected infanticide (SSI) has been suggested previously as a mortality factor in our study populations. Females in the south became primiparous earlier than females in the north. Primiparous females had signiWcantly smaller litters of cubs than multiparous females. We found no evidence that primiparity was costly in terms of the interlitter interval. Primiparous mothers had a higher probability of cub loss than multiparous mothers. The probability of cub loss was analyzed separately for the premating and the mating season. The probability of cub loss by primiparous females in the pre-mating season increased with both increasing population density and deteriorating food conditions, whereas the probability of cub loss during the mating season decreased with increasing age of primiparity and increased with male turnover (a variable predicting SSI). The temporal patterns of cub loss by primiparous females suggested that the critical times for reproductive success by primiparous females were the pre-mating season (from birth to shortly after leaving the den) and the mating season. Cub loss in these periods was independent and caused by diVerent factors. Cub loss before the mating season seemed to be most inXuenced by food conditions, whereas that during the mating season appeared to be caused by SSI. Text Ursus arctos Unknown |
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Abstract We studied the eVects of primiparity on litter size, oVspring size, and cub loss in brown bears (Ursus arctos) in two study areas (north, south) in Sweden from 1987 to 2006. Sexually selected infanticide (SSI) has been suggested previously as a mortality factor in our study populations. Females in the south became primiparous earlier than females in the north. Primiparous females had signiWcantly smaller litters of cubs than multiparous females. We found no evidence that primiparity was costly in terms of the interlitter interval. Primiparous mothers had a higher probability of cub loss than multiparous mothers. The probability of cub loss was analyzed separately for the premating and the mating season. The probability of cub loss by primiparous females in the pre-mating season increased with both increasing population density and deteriorating food conditions, whereas the probability of cub loss during the mating season decreased with increasing age of primiparity and increased with male turnover (a variable predicting SSI). The temporal patterns of cub loss by primiparous females suggested that the critical times for reproductive success by primiparous females were the pre-mating season (from birth to shortly after leaving the den) and the mating season. Cub loss in these periods was independent and caused by diVerent factors. Cub loss before the mating season seemed to be most inXuenced by food conditions, whereas that during the mating season appeared to be caused by SSI. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Andreas Zedrosser Bjørn Dahle Ole-Gunnar Støen Jon E Swenson |
spellingShingle |
Andreas Zedrosser Bjørn Dahle Ole-Gunnar Støen Jon E Swenson The eVects of primiparity on reproductive performance in the brown bear |
author_facet |
Andreas Zedrosser Bjørn Dahle Ole-Gunnar Støen Jon E Swenson |
author_sort |
Andreas Zedrosser |
title |
The eVects of primiparity on reproductive performance in the brown bear |
title_short |
The eVects of primiparity on reproductive performance in the brown bear |
title_full |
The eVects of primiparity on reproductive performance in the brown bear |
title_fullStr |
The eVects of primiparity on reproductive performance in the brown bear |
title_full_unstemmed |
The eVects of primiparity on reproductive performance in the brown bear |
title_sort |
evects of primiparity on reproductive performance in the brown bear |
publishDate |
2009 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.3232 http://bearproject.info/wp-content/uploads/2014/07/2009-Zedrosser-et-al-primiparity-Oecologia.pdf |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
http://bearproject.info/wp-content/uploads/2014/07/2009-Zedrosser-et-al-primiparity-Oecologia.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.3232 http://bearproject.info/wp-content/uploads/2014/07/2009-Zedrosser-et-al-primiparity-Oecologia.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766231759171616768 |