Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway
Relative starvation risk and body condition were investigated in 599 Goshawks that had died in collision accidents or of starvation. Specimens were collected by the public along a 1300‐km north–south (58°N–71°N) gradient in Norway, representing the northernmost geographical range of the species. The...
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Online Access: | http://dx.doi.org/10.1046/j.1474-919x.2002.00050.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1474-919X.2002.00050.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1474-919X.2002.00050.x |
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crwiley:10.1046/j.1474-919x.2002.00050.x 2024-09-09T18:54:47+00:00 Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway Sunde, Peter 2002 http://dx.doi.org/10.1046/j.1474-919x.2002.00050.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1474-919X.2002.00050.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1474-919X.2002.00050.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 144, issue 2, page 301-310 ISSN 0019-1019 1474-919X journal-article 2002 crwiley https://doi.org/10.1046/j.1474-919x.2002.00050.x 2024-08-06T04:13:46Z Relative starvation risk and body condition were investigated in 599 Goshawks that had died in collision accidents or of starvation. Specimens were collected by the public along a 1300‐km north–south (58°N–71°N) gradient in Norway, representing the northernmost geographical range of the species. The probability of a Goshawk’s death being caused by starvation as opposed to by a collision accident increased with latitude with juvenile males at a disproportionately higher risk than others. Of birds killed in accidents, females generally were in better condition than males, and adults in better condition than juveniles. A season‐by‐latitude interaction indicated that males from northern latitudes were in poorer condition during winter and spring than males from southern parts of the country. This could also be modelled as a curvilinear relationship with daylength. There were no significant relationships between weather factors in the weeks prior to the deaths of the birds and the relative starvation probability or the condition of trauma victims. The results suggest that food limitation plays a relatively higher role in northern populations, affecting young males especially. This was also supported by the fact that the sex ratio of accidentally killed birds was increasingly female biased with increasing latitudes. It is suggested that the relatively higher mortality risk of males is due to their smaller average body size, and that selection for starvation resistance during winter is the reason behind the clinal increase of body size in Goshawks towards the northern and eastern parts of Europe. Article in Journal/Newspaper Accipiter gentilis Wiley Online Library Norway Ibis 144 2 301 310 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Relative starvation risk and body condition were investigated in 599 Goshawks that had died in collision accidents or of starvation. Specimens were collected by the public along a 1300‐km north–south (58°N–71°N) gradient in Norway, representing the northernmost geographical range of the species. The probability of a Goshawk’s death being caused by starvation as opposed to by a collision accident increased with latitude with juvenile males at a disproportionately higher risk than others. Of birds killed in accidents, females generally were in better condition than males, and adults in better condition than juveniles. A season‐by‐latitude interaction indicated that males from northern latitudes were in poorer condition during winter and spring than males from southern parts of the country. This could also be modelled as a curvilinear relationship with daylength. There were no significant relationships between weather factors in the weeks prior to the deaths of the birds and the relative starvation probability or the condition of trauma victims. The results suggest that food limitation plays a relatively higher role in northern populations, affecting young males especially. This was also supported by the fact that the sex ratio of accidentally killed birds was increasingly female biased with increasing latitudes. It is suggested that the relatively higher mortality risk of males is due to their smaller average body size, and that selection for starvation resistance during winter is the reason behind the clinal increase of body size in Goshawks towards the northern and eastern parts of Europe. |
format |
Article in Journal/Newspaper |
author |
Sunde, Peter |
spellingShingle |
Sunde, Peter Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway |
author_facet |
Sunde, Peter |
author_sort |
Sunde, Peter |
title |
Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway |
title_short |
Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway |
title_full |
Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway |
title_fullStr |
Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway |
title_full_unstemmed |
Starvation mortality and body condition of Goshawks Accipiter gentilis along a latitudinal gradient in Norway |
title_sort |
starvation mortality and body condition of goshawks accipiter gentilis along a latitudinal gradient in norway |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1046/j.1474-919x.2002.00050.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1474-919X.2002.00050.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1474-919X.2002.00050.x |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Accipiter gentilis |
genre_facet |
Accipiter gentilis |
op_source |
Ibis volume 144, issue 2, page 301-310 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1474-919x.2002.00050.x |
container_title |
Ibis |
container_volume |
144 |
container_issue |
2 |
container_start_page |
301 |
op_container_end_page |
310 |
_version_ |
1809823804054044672 |