期刊
AMERICAN NATURALIST
卷 182, 期 4, 页码 465-473出版社
UNIV CHICAGO PRESS
DOI: 10.1086/671999
关键词
pulsed resources; sociality; Astragalus scaphoides; density-dependent pollen limitation; Bombus; Anthophora
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Montana (2002)
- National Science Foundation (NSF) [DEB 02-36427, DEB 05-15756]
- NSF [DEB 10-20889]
- Direct For Biological Sciences
- Division Of Environmental Biology [1411420] Funding Source: National Science Foundation
Pulsed food resources lead to mismatches between distribution of consumers and resources in space and time. Many studies have investigated how pollinators and floral resources covary in space, but few have looked at their covariance among years. I studied responses of two bee taxa, Bombus (a social genus) and Anthophora (a solitary genus), to variation in flowering by Astragalus scaphoides, a perennial herb that flowers in alternate years. First, I quantified the rate at which individual plants were visited by bees. Anthophora showed evidence of a demographic response to resource pulsesthat is, more individuals were seen in the year after a high-flowering yearwhereas Bombus did not. Second, I quantified pollinator behavior by following individual bees and recording the proportion of visits to A. scaphoides within single foraging bouts. The proportion of visits to A. scaphoides by both taxa increased with A. scaphoides''s flowering density. Higher specialization in high-flowering years likely makes both taxa better pollinators in high-flowering years. If these taxa differ in effectiveness as pollinators, then these responses translate into variation in pollination services in space and time, specifically, more activity by Bombus in high-flowering years and more by Anthophora in years following high-flowering years. They also emphasize that pollinator activity depends in part on pastas well as currentfloral resources.
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