Long-Term Population Trends of House Sparrow and Eurasian Tree Sparrow in Spain

Q4 Agricultural and Biological Sciences Western Birds Pub Date : 2023-03-25 DOI:10.3390/birds4020013
Elena Ramos-Elvira, E. Banda, J. Arizaga, David Martín, J. I. Aguirre
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Abstract

Urban areas are constantly increasing, which can cause an effect in bird populations since human activities lead to nature alterations. Populations of House Sparrow (Passer domesticus) and Eurasian Tree Sparrow (Passer montanus) have been decreasing in Spain according to the latest national censuses in Spain. In this study, we tried to assess the population trend over more than two decades using ringing data from Spanish constant effort sites, as well as to determine the population and breeding success proxy in relation to habitat composition at landscape level. We analysed the data and confirmed the decreasing trend in the two species. However, Eurasian Tree Sparrow showed signs of increasing presence in urban areas. Furthermore, the productivity remained stable over sampling sites and years, meaning that the causes of the decreasing populations are affecting both adult and juvenile individuals.
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西班牙家雀和欧亚树雀种群的长期趋势
城市面积不断增加,由于人类活动导致自然变化,这可能会对鸟类种群造成影响。根据西班牙最新的全国人口普查,西班牙家麻雀(Passer domesticus)和欧亚树麻雀(Passer montanus)的种群数量一直在减少。在这项研究中,我们试图利用西班牙恒定努力点的环形数据来评估20多年来的种群趋势,并在景观水平上确定与栖息地组成相关的种群和繁殖成功代理。我们对数据进行了分析,证实了这两个物种的下降趋势。然而,欧亚树雀在城市地区出现了增加的迹象。此外,在采样地点和年份中,生产力保持稳定,这意味着种群减少的原因同时影响到成年和幼年个体。
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来源期刊
Western Birds
Western Birds Agricultural and Biological Sciences-Animal Science and Zoology
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