Intraguild predation and competition impacts on a subordinate predator

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http://hdl.handle.net/10138/175688

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Bjorklund , H , Santangeli , A , Blanchet , F G , Huitu , O , Lehtoranta , H , Linden , H , Valkama , J & Laaksonen , T 2016 , ' Intraguild predation and competition impacts on a subordinate predator ' , Oecologia , vol. 181 , no. 1 , pp. 257-269 . https://doi.org/10.1007/s00442-015-3523-z

Title: Intraguild predation and competition impacts on a subordinate predator
Author: Bjorklund, Heidi; Santangeli, Andrea; Blanchet, F. Guillaume; Huitu, Otso; Lehtoranta, Hannu; Linden, Harto; Valkama, Jari; Laaksonen, Toni
Contributor: University of Helsinki, Finnish Museum of Natural History
University of Helsinki, Finnish Museum of Natural History
University of Helsinki, Finnish Museum of Natural History
Date: 2016-05
Language: eng
Number of pages: 13
Belongs to series: Oecologia
ISSN: 0029-8549
URI: http://hdl.handle.net/10138/175688
Abstract: Intraguild (IG) predation and interspecific competition may affect the settlement and success of species in their habitats. Using data on forest-dwelling hawks from Finland, we addressed the impact of an IG predator, the northern goshawk Accipiter gentilis (goshawk), on the breeding of an IG prey, the common buzzard Buteo buteo. We hypothesized that the subordinate common buzzard avoids breeding in the proximity of goshawks and that interspecific competitors, mainly Strix owls, may also disturb common buzzards by competing for nests and food. Our results show that common buzzards more frequently occupied territories with a low IG predation threat and with no interspecific competitors. We also observed that common buzzards avoided territories with high levels of grouse, the main food of goshawks, possibly due to a risk of IG predation since abundant grouse can attract goshawks. High levels of small rodents attracted interspecific competitors to common buzzard territories and created a situation where there was not only an abundance of food but also an abundance of competitors for the food. These results suggest interplay between top-down and bottom-up processes which influence the interactions between avian predator species. We conclude that the common buzzard needs to balance the risks of IG predation and interference competition with the availability of its own resources. The presence of other predators associated with high food levels may impede a subordinate predator taking full advantage of the available food. Based on our results, it appears that interspecific interactions with dominant predators have the potential to influence the distribution pattern of subordinate predators.
Subject: Bird-of-prey
Predator avoidance
Interference competition
Dominance
Food conflict
GOSHAWK ACCIPITER-GENTILIS
BUZZARD BUTEO-BUTEO
FIELD EXPERIMENTS
SPOTTED OWLS
TOP-DOWN
COMMON BUZZARD
BARRED OWLS
INTERFERENCE COMPETITION
BOTTOM-UP
HABITAT
1181 Ecology, evolutionary biology
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