GEOGRAPHICAL PATTERNS OF PERSISTENCE IN DUCK GUILDS

被引:21
作者
BETHKE, RW
机构
[1] Department of Zoology, University of Guelph, Guelph, N1G 2W1, Ontario
关键词
COMMUNITY; DUCKS; DIVERSITY; LATITUDE; PERSISTENCE;
D O I
10.1007/BF00321198
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Geographical gradients of persistence in community structure have been suggested to be causally related to underlying gradients of species diversity, environmental variability and/or productivity. In order to test whether the persistence of breeding duck communities was dependent on any one of these three factors, thirty-three years of census data from the Canadian prairie and boreal forest regions was examined along geographical gradients of wetland habitat variability and productivity. For breeding ducks, locally derived patterns of persistence were generally independent of local habitat conditions. Persistence appeared to be related more to patterns of emigration and immigration in response to climatic conditions (i.e., drought) in the southern prairies than to local species richness, wetland habitat variability or productivity. It is suggested, therefore, that analyses of community persistence derived at small spatial scales may be of limited value if the structure of communities is not regulated by local conditions.
引用
收藏
页码:102 / 108
页数:7
相关论文
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