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1 May 2000 INFLUENCE OF TREEFALL GAPS ON DISTRIBUTIONS OF BREEDING BIRDS WITHIN INTERIOR OLD-GROWTH STANDS IN BIAŁOWIEŻA FOREST, POLAND
Robert J. Fuller
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Abstract

Breeding birds were counted using point counts at 50 treefall gaps and 50 closed-canopy sites within one of the largest tracts of old-growth forest in Europe. Numbers of species and individuals were slightly, but significantly, higher at gaps. Overall bird species composition differed substantially at gaps and non-gaps. Dunnock (Prunella modularis), Blackcap (Sylvia atricapilla), and Chiffchaff (Phylloscopus collybita) were significantly more abundant at gaps. Wood Warbler (Phylloscopus sibilatrix) and Red-breasted Flycatcher (Ficedula parva) were significantly more abundant at non-gaps. Warblers (Sylviidae), ground insectivores, ground nesters, and short-distance migrants were significantly more abundant at gaps, but no species groups were more abundant at non-gaps. Eight species breeding in forest edges and young plantations in eastern Poland were not recorded in natural treefall gaps. The proportion of tropical migrant passerines was considerably higher in closed-canopy stands (0.47) than at gaps (0.29), which contrasts with the situation in most managed European forests where the highest proportions of tropical migrants typically occur in young-growth forests.

Robert J. Fuller "INFLUENCE OF TREEFALL GAPS ON DISTRIBUTIONS OF BREEDING BIRDS WITHIN INTERIOR OLD-GROWTH STANDS IN BIAŁOWIEŻA FOREST, POLAND," The Condor 102(2), 267-274, (1 May 2000). https://doi.org/10.1650/0010-5422(2000)102[0267:IOTGOD]2.0.CO;2
Received: 1 December 1998; Accepted: 1 January 2000; Published: 1 May 2000
KEYWORDS
Białowieża Forest
community structure
forest dynamics
old-growth
treefall gaps
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