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Comparing predation on forest grouse nests by avian and mammalian predators in two contrasting boreal forest landscapes by the use of artificial nests

Wegge, Per; Ingul, Halvor; Pollen, Vebjørn Oppegaard; Halvorsrud, Emil; Sivkov, Andrey V.; Hjeljord
Journal article, Peer reviewed
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Permanent link
http://hdl.handle.net/11250/134552
Issue date
2012
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  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed [712]
Original version
Wegge, P., Ingul, H., Pollen, V. O., Halvorsrud, E., Sivkov, A. V., & Hjeljord, O. (2012). Comparing predation on forest grouse nests by avian and mammalian predators in two contrasting boreal forest landscapes by the use of artificial nests. Ornis Fennica, 89, 145-156.  
Abstract
Egg predation is an important determinant of breeding success among boreal forest

grouse, but the relative roles ofmammalian and avian predators are poorly known. During

spring/early summer of 2010, predation on artificial nests was studied by placing nests on

the ground and on 1.5-m tall poles at two forested areas. One study site was highly fragmented

due to intensive forestry (Varaldskogen, Norway) and the other site was a pristine,

natural forest in north-western Russia (Pinega Forest Reserve). The nests on poles were

subject to predation by birds and those on the ground by both mammals and birds. Total

predationwas significantly higher inVaraldskogen than in Pinega. Ground nests suffered

ca. 2.5 times higher losses than nests on poles. In Pinega, predation did not differ between

the two nest types. The difference between the two areas was probably due to different

predator guilds:mammalian generalist predators, such as theRed Fox (Vulpes vulpes) and

Badger (Meles meles), were common in Varaldskogen but scarce or absent in Pinega.

Canopy cover explained most of the variation in predation rate in Varaldskogen, but no

significant relationship with canopy or nest concealment was detected in Pinega. Predation

on pole nests varied across habitat types in a similarmanner at the two areas, but predation

on ground nests did not. As Raven (Corvus corax) and Hooded Crow (Corvus

corone cornix)were rare in both areas, these findings suggest similar searching and predatory

behaviour of the two main (smaller) corvids, the Eurasian Jay (Garrulus

glandarius) in Varaldskogen and the Siberian Jay (Perisoreus infaustus) in Pinega. Although

the study design allowed a comparison between avian andmammalian nest predators,

the lack of a clearer relationship between predation and certain variables suggests

that nest predation is a complex process involving components of predator behaviour.
Description
The article can also be located on the Ornis Fennica webpage: http://www.ornisfennica.org/index.htm
Publisher
Suomen lintutieteellinen yhdistys
Journal
Ornis Fennica

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