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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Changes in numbers of breeding birds in an agricultural landscape of east-central Poland
Auteurs :	Andrzej Dombrowski, Auteur ; Artur Golawski, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (123(2) 2002)
Article en page(s) :	79-87
Résumé :	The breeding bird community of a fragmented agricultural landscape in eastern Mazovian province, Poland, was studied in two periods: the late 1970s and the late 1990s. Most species were surveyed by territory mapping, the others by special methods (e.g. nest counts). Between the two study periods, the proportion of fallow land and orchards increased in the study area. Most of the 45 breeding bird species (57%) tended to increase, 7 species (16%) declined, and 12 species (27%) were stable. The strongest decline (over -50%) was noted for Hoopoe, Tawny Owl, Kestrel, and Barred Warbler. Stable populations (below 20% variation) were found in White Stork. Turtle Dove, Long-earned Owl, Little Owl, Wryneck, and Woodlark. Among increasing species (over +20%), breeding populations of Montagu's Harrier, Sparrow Hawk, Goshawk, Common Buzzard, Red-backed Shrike, Great Grey Shrike, Collared Dove, Whinchat, Fieldfare, and Serin increased most markedly. Increases of Whinchat and Corn Bunting were due to changes in the structure of agricultural landscape in which the proportion of fallow land/set-asides markedly increased. The increase in several species of birds of prey and, presumably, in Red-Backed Shrikes, Great Grey Shrikes, and Ravens was likely a result of a decreasing use of pesticides in agriculture. But the increase in the number of remaining species cannot be explained by a less intensive agriculture. No significant differences were found in population changes with respect to the migration strategies. A decrease was noted for 27% of short-distance migrants. In this group the proportion of stable species was also relatively low (20%). The resident species fared best, as only numbers of Tawny Owls decreased, while the remaining species (94%) were stable or increasing. Population trends in long-distance migrants were intermediate between those of short-distance migrants and residents.

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