Warmer springs, laying date and clutch size of tree sparrows Passer montanus in Croatia  

作　　者：Z. DOLENEC R DOLENEC A.R MDLLER 

机构地区：[1]Department of Zoology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, HR- 10000 Zagreb, Croatia [2]High School Oroslavje, Ljudevita Gaja 1, HR-49243 Oroslavje, Croatia [3]Laboratorie d'Ecologie, Syst6matique et Evolution, CNRS UMR 8079, Universit6 Paris-Sud, 362, F-91405 Orsay Cedex, France

出　　处：《Current Zoology》2011年第3期414-418,共5页动物学报（英文版）

摘　　要：Global surface air temperatures increased during the past 100 years. Many long-term studies of birds have reported a climatic influence on breeding performance. We analysed long-term changes in first laying date and clutch size for first clutches of sedentary, hole-nesting and socially monogamous tree sparrows Passer montanus during 1980-2009 in northwestern Croatia. Laying date advanced and spring temperature increased significantly during the study. Date of laying was significantly correlated with mean air spring temperature and advanced by 8.6 days during the 30 years period. Laying date was delayed in extremely cold, but not in extremely warm springs compared to years with normal temperatures. These results suggest that current climate change including extreme change does not have negative effects on timing of laying or clutch size. In contrast to laying date, clutch size did not vary systematically during the study period or with mean spring air temperature changes [Current Zoology 57 （3）： 414-418, 2011].

关 键 词：Climate change Clutch size Laying date Passer montanus Tree sparrow 

分 类 号：P315.7[天文地球—地震学] U463.211[天文地球—固体地球物理学]