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Acta Ornithologica
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1995
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tom 29
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nr 3
145-154
Studies carried out in an agricultural landscape between 1989 and 1992 revealed 32 wintering species of birds along 13.6 km of transects passing through three biotopes: woodland interior, woodland edge and belts of trees. 42 species were noted in the area as a whole. The variability in the densities and biomass of plant-eating species was found to be greater than that for insect-eaters, but no trends were noted for changes in density in the course of the winter. The variability in the density of plant-eating species was less differentiated in the different biotopes and greater than that observed for insect-eating species. 27 species fed in belts of trees (7.3 ind. /ha), 24 at the woodland edge (2 ind. / ha) and 22 in the woodland interior (3.9 ind./ha). Plant-eating species showed a significant preference for belts of trees over the other biotopes, while insect-eating species favoured belts of trees or the woodland interior where population density was concerned, and the woodland interior when it came to biomass. The proportion of insect-eating species was lowest in belts of trees (35% by population density and 10% by biomass) and highest in the woodland interior (86% and 71% respectively). Population density and biomass were correlated positively with the age of tree stand for insect-eating species but not for plant-eating species. The distribution of birds in woodbelts was modified by adjoining woods: population density (total or within trophic guilds) was higher near woodlands than in central parts of the belt of trees.
A study of development of newly planted shelterbelts and its impact on some ecological processes (plant biomass decomposition, insects diversity enrichment, corridor effect for mammals) were conducted in Turew agricultural landscape (West Poland). The aim and general background of study was described. Study area was characterized.
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