Changes In Tree Sparrow Passer Montanus Populations From Urban Parks

L. Tomiałojć
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引用次数: 6

Abstract

Abstract Studies of local Tree Sparrow Passer montanus populations from urban parks of Polish cities reveal changes in abundance and in nest site selection which differ from data collected from farmland. These changes are not always synchronous among neighbouring cities and parks. Several urban declines are difficult to explain, chiefly when obscured by the changes in the number of artificial nesting sites. One such case was a recorded decline Tree Sparrow and a switch to nesting in buildings observed in the Szczytnicki Park of Wrocław, after colonization by pine martens Martes martes. Judging from this the absence/presence of important predators or nest predators in other urban parks of Polish cities may be an additional factor promoting Tree Sparrow declines. It is suggested that a lack of precise data on the intensity of (mosaic-like in time and space) predation pressure in agricultural and urban landscapes should be considered when explaining the reasons for population changes in other bird species.
城市公园雀鸟种群的变化
对波兰城市公园的当地树雀种群的研究揭示了其数量和巢穴选择的变化,这与在农田收集的数据不同。这些变化在邻近的城市和公园之间并不总是同步的。一些城市的下降很难解释,主要是由于人工筑巢地点数量的变化。其中一个例子是,在Wrocław的Szczytnicki公园,在松貂Martes Martes定居之后,树雀的数量下降,并转向在建筑物中筑巢。由此判断,波兰城市其他城市公园中重要捕食者或巢穴捕食者的缺失/存在可能是促进树雀减少的另一个因素。在解释其他鸟类种群变化的原因时,应考虑到农业和城市景观中缺乏精确的捕食压力强度数据(在时间和空间上呈马赛克状)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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