Szukana fraza: [Abstract = "The rate of nest\-box occupation by House Sparrow decreased sharply since 1980s, and opposite trend was observed for Tree Sparrow. These alterations are consistent with the general changes in both species populations in Warsaw in recent decades\: decrease in House Sparrow and increase in Tree Sparrow number. The presented results suggest that loss of nest sites may not be the main reason of decrease in House Sparrow population in Warsaw. Additionally, House Sparrow decline leads to increase in nest sites \(including nest\-boxes\) available for Tree Sparrow, what may contribute to the expansion of the latter species."]

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