Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons
Predators may influence many aspects of the daily life and seasonal movements of their prey. Here we quantify direct, and evaluate indirect effects of predation by three falcon species (Lanner Falcon Falco biarmicus , Barbary Falcon Falco pelegrinoides and Peregrine Falcon Falco peregrinus ) on coas...
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Online Access: | http://dx.doi.org/10.1111/j.1474-919x.2008.00785.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2008.00785.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2008.00785.x |
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crwiley:10.1111/j.1474-919x.2008.00785.x 2024-06-23T07:51:55+00:00 Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons VAN DEN HOUT, PIET J. SPAANS, BERNARD PIERSMA, THEUNIS 2008 http://dx.doi.org/10.1111/j.1474-919x.2008.00785.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2008.00785.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2008.00785.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 150, issue s1, page 219-230 ISSN 0019-1019 1474-919X journal-article 2008 crwiley https://doi.org/10.1111/j.1474-919x.2008.00785.x 2024-06-04T06:43:22Z Predators may influence many aspects of the daily life and seasonal movements of their prey. Here we quantify direct, and evaluate indirect effects of predation by three falcon species (Lanner Falcon Falco biarmicus , Barbary Falcon Falco pelegrinoides and Peregrine Falcon Falco peregrinus ) on coastal shorebirds wintering on the Banc d’Arguin, Mauritania, an area hosting approximately 30% of the East Atlantic Flyway population of shorebirds. On the basis of 754 h of observation over five winters, 97 witnessed attacks and 585 collected prey remains, we show that shorebirds were safer in larger flocks, which tended to be attacked less often. Furthermore, species that forage relatively close to shore and in small flocks were depredated more often than expected from their relative abundance. In three species, Red Knot Calidris canutus canutus , Bar‐tailed Godwit Limosa lapponica taymyrensis and Dunlin Calidris alpina , the juveniles were more vulnerable than adults. We estimated that on average 1% of the juvenile and 0.1% of the adult Red Knots present were killed by large falcons each winter. For Red Knots we simultaneously quantified annual survival on the basis of an individual colour‐marking programme: mortality due to predation by falcons accounted for an estimated 6.2% (juveniles) and 0.8% (adults) of annual mortality. We suggest that juvenile Red Knots are 10 times as likely to be killed by falcons because they use riskier habitats, i.e. early and late tide foraging areas closer to shores where surprise attacks are both more common and more successful. These results indicate that the strength of indirect effects of predation operating in a shorebird population largely outweigh the effects of mortality per se . Article in Journal/Newspaper Calidris alpina Calidris canutus Falco peregrinus peregrine falcon Red Knot Wiley Online Library Ibis 150 s1 219 230 |
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English |
description |
Predators may influence many aspects of the daily life and seasonal movements of their prey. Here we quantify direct, and evaluate indirect effects of predation by three falcon species (Lanner Falcon Falco biarmicus , Barbary Falcon Falco pelegrinoides and Peregrine Falcon Falco peregrinus ) on coastal shorebirds wintering on the Banc d’Arguin, Mauritania, an area hosting approximately 30% of the East Atlantic Flyway population of shorebirds. On the basis of 754 h of observation over five winters, 97 witnessed attacks and 585 collected prey remains, we show that shorebirds were safer in larger flocks, which tended to be attacked less often. Furthermore, species that forage relatively close to shore and in small flocks were depredated more often than expected from their relative abundance. In three species, Red Knot Calidris canutus canutus , Bar‐tailed Godwit Limosa lapponica taymyrensis and Dunlin Calidris alpina , the juveniles were more vulnerable than adults. We estimated that on average 1% of the juvenile and 0.1% of the adult Red Knots present were killed by large falcons each winter. For Red Knots we simultaneously quantified annual survival on the basis of an individual colour‐marking programme: mortality due to predation by falcons accounted for an estimated 6.2% (juveniles) and 0.8% (adults) of annual mortality. We suggest that juvenile Red Knots are 10 times as likely to be killed by falcons because they use riskier habitats, i.e. early and late tide foraging areas closer to shores where surprise attacks are both more common and more successful. These results indicate that the strength of indirect effects of predation operating in a shorebird population largely outweigh the effects of mortality per se . |
format |
Article in Journal/Newspaper |
author |
VAN DEN HOUT, PIET J. SPAANS, BERNARD PIERSMA, THEUNIS |
spellingShingle |
VAN DEN HOUT, PIET J. SPAANS, BERNARD PIERSMA, THEUNIS Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons |
author_facet |
VAN DEN HOUT, PIET J. SPAANS, BERNARD PIERSMA, THEUNIS |
author_sort |
VAN DEN HOUT, PIET J. |
title |
Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons |
title_short |
Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons |
title_full |
Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons |
title_fullStr |
Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons |
title_full_unstemmed |
Differential mortality of wintering shorebirds on the Banc d’Arguin, Mauritania, due to predation by large falcons |
title_sort |
differential mortality of wintering shorebirds on the banc d’arguin, mauritania, due to predation by large falcons |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1111/j.1474-919x.2008.00785.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2008.00785.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2008.00785.x |
genre |
Calidris alpina Calidris canutus Falco peregrinus peregrine falcon Red Knot |
genre_facet |
Calidris alpina Calidris canutus Falco peregrinus peregrine falcon Red Knot |
op_source |
Ibis volume 150, issue s1, page 219-230 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1474-919x.2008.00785.x |
container_title |
Ibis |
container_volume |
150 |
container_issue |
s1 |
container_start_page |
219 |
op_container_end_page |
230 |
_version_ |
1802643063487594496 |