First-Time Observer Effects in the North American Breeding Bird Survey
作者： William L. Kendall , Bruce G. Peterjohn , John R. Sauer
DOI: 10.2307/4088860
关键词:
摘要: … Removal of an observer's first year of observation on each route for the period 1966 to 1991 … significant first-time observer effects were disproportionately distributed among migration …
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