Multi-scale approach to brown bear (Ursus arctos) foraging on trees: characteristics of damage to trees and stands in the north-eastern Carpathians
PBN-AR
Instytucja
Instytut Ochrony Przyrody Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
FORESTRY (40pkt w roku publikacji)
ISSN
0015-752X
EISSN
1464-3626
Wydawca
OXFORD UNIV PRESS
DOI
URL
Rok publikacji
2018
Numer zeszytu
2
Strony od-do
185-192
Numer tomu
91
Identyfikator DOI
Liczba arkuszy
Autorzy
Pozostali autorzy
+ 1
Streszczenia
Język
angielski
Treść
Bark stripping behaviour of bears, which may significantly reduce the value of timber, has been reported mostly from North America and Japan, but in recent decades also from Europe. We surveyed forest plots in the Bieszczady Mountains of southeast Poland and recorded bark stripping by brown bears. We distinguished two types of tree damage by brown bears – damage to single (since no other damaged trees were found in their vicinity) and groups of trees (when five or more damaged trees were found in a small area). We found that all wound parameters, but especially the wound area and the proportion of the trunk with missing bark, were greater on single damaged trees. Comparison of damaged and control tree plots (1000 m2) revealed that bears foraged in stands where silver firs (Abies alba Mill.) with larger circumferences were present. Moreover, in stands where damage occurred, bears tended to strip large trees. The preference ratio index clearly showed that bears mostly preferred to forage on firs with circumferences in the 120–180 cm range, even though a wide spectrum of tree circumferences were available. Our results suggest that the brown bear should not be viewed as a pest species in commercial tree stands in Poland. The trees preferred by bears for foraging are large enough for timber production. To minimize economical losses, forestry personnel should regularly monitor tree stands that consist of trees of dimensions preferred by bears.
Inne
System-identifier
PX-5a5c9749d5dea283bf75ed02
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