Changes in bird distribution in a Central European country between 1985–1989 and 2001–2003 |
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Institution: | (1) Department of Zoology and Laboratory of Ornithology, Faculty of Science, Palack? University, tř. Svobody 26, 771 46 Olomouc, Czech Republic;(2) Institute for Environmental Studies, Faculty of Science, Charles University in Prague, Ben?tsk? 2, 128 01 Praha 2, Czech Republic;(3) Department of Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences, Kam?ck? 1176, 165 21 Praha 6, Czech Republic |
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Abstract: | European birds have been significantly affected by dramatic environmental changes during the last decades. The effects of
these changes on species richness and distribution in particular countries are still poorly understood because of a lack of
high-quality, large-scale data standardized over time. This is especially true in Central and Eastern Europe. On a model group
of birds in the Czech Republic (countrywide atlas mapping data), we examined whether long-term changes of species richness
and distribution between 1985–1989 and 2001–2003 differed among groups of species defined by their habitat requirements, type
of distribution in Europe, migratory strategy and the degree of national legal protection. Further, we investigated the effects
of colonizers and local extinctions on these changes. Whereas the number of species in the whole country remained the same
in both periods (208 species), species composition had changed. Increasing occupancy (i.e., number of occupied mapping squares)
was observed in species of forest and wetland habitats, in short-distance migrants and in non-protected species. Southern
species also positively changed their occupancy, but this pattern disappeared after the inclusion of six species dependent
on extensively cultivated farmland that went extinct between mappings. The overall occupancy of all species together showed
positive changes after excluding colonizers and extinct species. We suggest that the improvement of environmental conditions
after 1990 caused the stability of or increased the distribution of common birds in the Czech Republic, and it was the disappearance
of specific farmland practices that might have caused the loss of several species. |
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