The Distribution and Decline of British Bumble Bees (Bombus Latr.)
作者： Paul H. Williams
DOI: 10.1080/00218839.1982.11100549
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摘要: SummaryThe suggested recent decrease in the distributional ranges of certain species bumble bees was investigated data collected by Bumblebee Distribution Maps Scheme, using a numerical classificatory approach. Three major biogeographic elements and four regions are defined, changes their composition distribution described. Large reductions recorded after 1960 were found for two (especially Southern Local Species: Bombus subterraneus (L.), B. sylvarum ruderatus (F.) humilis Ill.), which have resulted emergence new Central Impoverished Region covering 23 vice-counties England.
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