2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus
Hen Harriers Circus cyaneus and Montagu's Harriers Circus pygargus are medium-sized raptors that differ in size (Hen Harrier being slightly bigger than Montagu's Harrier) and breeding system (Montagu's Harriers are semi-colonial and Hen Harriers defend nestinghunting territories). In...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1052.1856 2023-05-15T15:55:33+02:00 2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus J T Garcia B E Arroyo The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1052.1856 http://www.avibirds.com/pdf/G/Grauwe%20Kiekendief5.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1052.1856 http://www.avibirds.com/pdf/G/Grauwe%20Kiekendief5.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.avibirds.com/pdf/G/Grauwe%20Kiekendief5.pdf text ftciteseerx 2020-04-12T00:15:48Z Hen Harriers Circus cyaneus and Montagu's Harriers Circus pygargus are medium-sized raptors that differ in size (Hen Harrier being slightly bigger than Montagu's Harrier) and breeding system (Montagu's Harriers are semi-colonial and Hen Harriers defend nestinghunting territories). In contrast, the diets of the two species when in sympatry are very similar. We evaluated food-niche differentiation among these coexisting raptor species and how between-species differences in body size and social system influence interspecific relationships. We present data from a study conducted in 1997 and 1998 in northeastern Madrid province (central Spain). Diet of the two species largely overlapped (55-95%) during the breeding season, but Hen Harriers preyed more often on larger species. This segregation was observed both in the average size of the primary prey (lagomorphs) and in the alternative prey (birds for Hen Harriers vs. insects for Montagu's Harriers), and was particularly apparent late in the season. Accordingly, feeding frequency of Montagu's Harriers, but not of Hen Harriers, increased later in the season. Size differences between species in prey brought to the nest were apparent for both males and females. Foraging behaviour also differed, as Hen Harriers spent more time hunting close to the nest than did Montagu's Harriers. This implies that segregation in foraging areas may also exist. Observed niche partitioning may relax the potential for competition between these species. Text Circus cyaneus Unknown |
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description |
Hen Harriers Circus cyaneus and Montagu's Harriers Circus pygargus are medium-sized raptors that differ in size (Hen Harrier being slightly bigger than Montagu's Harrier) and breeding system (Montagu's Harriers are semi-colonial and Hen Harriers defend nestinghunting territories). In contrast, the diets of the two species when in sympatry are very similar. We evaluated food-niche differentiation among these coexisting raptor species and how between-species differences in body size and social system influence interspecific relationships. We present data from a study conducted in 1997 and 1998 in northeastern Madrid province (central Spain). Diet of the two species largely overlapped (55-95%) during the breeding season, but Hen Harriers preyed more often on larger species. This segregation was observed both in the average size of the primary prey (lagomorphs) and in the alternative prey (birds for Hen Harriers vs. insects for Montagu's Harriers), and was particularly apparent late in the season. Accordingly, feeding frequency of Montagu's Harriers, but not of Hen Harriers, increased later in the season. Size differences between species in prey brought to the nest were apparent for both males and females. Foraging behaviour also differed, as Hen Harriers spent more time hunting close to the nest than did Montagu's Harriers. This implies that segregation in foraging areas may also exist. Observed niche partitioning may relax the potential for competition between these species. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J T Garcia B E Arroyo |
spellingShingle |
J T Garcia B E Arroyo 2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus |
author_facet |
J T Garcia B E Arroyo |
author_sort |
J T Garcia |
title |
2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus |
title_short |
2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus |
title_full |
2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus |
title_fullStr |
2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus |
title_full_unstemmed |
2005: Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus |
title_sort |
2005: food-niche differentiation in sympatric hen circus cyaneus and montagu’s harriers circus pygargus |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1052.1856 http://www.avibirds.com/pdf/G/Grauwe%20Kiekendief5.pdf |
genre |
Circus cyaneus |
genre_facet |
Circus cyaneus |
op_source |
http://www.avibirds.com/pdf/G/Grauwe%20Kiekendief5.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1052.1856 http://www.avibirds.com/pdf/G/Grauwe%20Kiekendief5.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766391037807296512 |