Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France
We studied Grey Partridge Perdix perdix mortality during breeding to identify the environmental causes of a long‐term decline in adult survival. We radiotagged and monitored daily from mid‐March to mid‐September 1009 females on ten contrasting study sites in 1995‐97. Simultaneously, we recorded habi...
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crwiley:10.1111/j.1474-919x.2001.tb04176.x 2024-09-15T18:02:09+00:00 Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France BRO, ELISABETH REITZ, FRANÇOIS CLOBERT, JEAN MIGOT, PIERRE MASSOT, MANUEL 2001 http://dx.doi.org/10.1111/j.1474-919x.2001.tb04176.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2001.tb04176.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2001.tb04176.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 143, issue 1, page 120-132 ISSN 0019-1019 1474-919X journal-article 2001 crwiley https://doi.org/10.1111/j.1474-919x.2001.tb04176.x 2024-09-05T05:08:00Z We studied Grey Partridge Perdix perdix mortality during breeding to identify the environmental causes of a long‐term decline in adult survival. We radiotagged and monitored daily from mid‐March to mid‐September 1009 females on ten contrasting study sites in 1995‐97. Simultaneously, we recorded habitat features and estimated the abundance of Hen and Marsh Harriers Circus cyaneus and C. aeruginosus Red Fox Vulpes vulpes and mustelids. We experimentally tested whether scavenging could have biased predation rates. We also examined, through the necropsy of 80 carcasses of Grey Partridge, whether disease, parasites or poisoning could have been ultimate causes of high predation rates. The survival rate of radiotagged females during spring and summer ranged from 0.25 to 0.65 across study areas. Mortality peaked in May, June and July when females were laying and incubating. The direct negative impact of farming practices was low (6%). Predation was the main proximate cause of female mortality during breeding (73%) and determined the survival rate, suggesting no compensation by other causes of mortality. Ground carnivores were responsible for 64% of predation cases, and raptors for 29%, but this proportion varied across study sites. Disease and poisoning did not appear to favour predation, and scavenging was not likely to have substantially overestimated predation rates. The predation rate on breeding females was positively correlated with the abundance of Hen and Marsh Harriers, suggesting an additional mortality in areas where harriers were abundant. The proportion of raptor predation was linearly related to harrier abundance. The predation rate was not correlated with the abundance of the Red Fox and mustelids. A potential density‐dependent effect on the predation rate was confounded by the abundance of harriers. We found no convincing relationship between the predation rate and habitat features, but we observed a positive relationship between the abundance of Hen and Marsh Harriers and the mean field size. This ... Article in Journal/Newspaper Circus cyaneus Wiley Online Library Ibis 143 1 120 132 |
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Wiley Online Library |
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English |
description |
We studied Grey Partridge Perdix perdix mortality during breeding to identify the environmental causes of a long‐term decline in adult survival. We radiotagged and monitored daily from mid‐March to mid‐September 1009 females on ten contrasting study sites in 1995‐97. Simultaneously, we recorded habitat features and estimated the abundance of Hen and Marsh Harriers Circus cyaneus and C. aeruginosus Red Fox Vulpes vulpes and mustelids. We experimentally tested whether scavenging could have biased predation rates. We also examined, through the necropsy of 80 carcasses of Grey Partridge, whether disease, parasites or poisoning could have been ultimate causes of high predation rates. The survival rate of radiotagged females during spring and summer ranged from 0.25 to 0.65 across study areas. Mortality peaked in May, June and July when females were laying and incubating. The direct negative impact of farming practices was low (6%). Predation was the main proximate cause of female mortality during breeding (73%) and determined the survival rate, suggesting no compensation by other causes of mortality. Ground carnivores were responsible for 64% of predation cases, and raptors for 29%, but this proportion varied across study sites. Disease and poisoning did not appear to favour predation, and scavenging was not likely to have substantially overestimated predation rates. The predation rate on breeding females was positively correlated with the abundance of Hen and Marsh Harriers, suggesting an additional mortality in areas where harriers were abundant. The proportion of raptor predation was linearly related to harrier abundance. The predation rate was not correlated with the abundance of the Red Fox and mustelids. A potential density‐dependent effect on the predation rate was confounded by the abundance of harriers. We found no convincing relationship between the predation rate and habitat features, but we observed a positive relationship between the abundance of Hen and Marsh Harriers and the mean field size. This ... |
format |
Article in Journal/Newspaper |
author |
BRO, ELISABETH REITZ, FRANÇOIS CLOBERT, JEAN MIGOT, PIERRE MASSOT, MANUEL |
spellingShingle |
BRO, ELISABETH REITZ, FRANÇOIS CLOBERT, JEAN MIGOT, PIERRE MASSOT, MANUEL Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France |
author_facet |
BRO, ELISABETH REITZ, FRANÇOIS CLOBERT, JEAN MIGOT, PIERRE MASSOT, MANUEL |
author_sort |
BRO, ELISABETH |
title |
Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France |
title_short |
Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France |
title_full |
Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France |
title_fullStr |
Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France |
title_full_unstemmed |
Diagnosing the environmental causes of the decline in Grey Partridge Perdix perdix survival in France |
title_sort |
diagnosing the environmental causes of the decline in grey partridge perdix perdix survival in france |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.1111/j.1474-919x.2001.tb04176.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2001.tb04176.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2001.tb04176.x |
genre |
Circus cyaneus |
genre_facet |
Circus cyaneus |
op_source |
Ibis volume 143, issue 1, page 120-132 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1474-919x.2001.tb04176.x |
container_title |
Ibis |
container_volume |
143 |
container_issue |
1 |
container_start_page |
120 |
op_container_end_page |
132 |
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1810439418056540160 |