title: Resource assurance predicts specialist and generalist bee activity in drought.
abstract: Many short-lived desert organisms remain in diapause during drought. Theoretically, the cues desert species use to continue diapause through drought should differ depending on the availability of critical resources, but the unpredictability and infrequent occurrence of climate extremes and reduced insect activity during such events make empirical tests of this prediction difficult. An intensive study of a diverse bee-plant community through a drought event found that bee specialists of a drought-sensitive host plant were absent in the drought year in contrast to generalist bees and to specialist bees of a drought-insensitive host plant. Different responses of bee species to drought indicate that the diapause cues used by bee species allow them to reliably predict host availability. Species composition of the bee community in drought shifted towards mostly generalist species. However, we predict that more frequent and extended drought, predicted by climate change models for southwest North America, will result in bee communities that are species-poor and dominated by specialist species, as found today in the most arid desert region of North America.
authors.affiliation: Department of Biology, University of Rochester, Rochester, NY 14627, USA. robert.minckley@rochester.edu
authors.forename: Robert L
authors.initials: RL
authors.lastname: Minckley
authors.forename: T'ai H
authors.initials: TH
authors.lastname: Roulston
authors.forename: Neal M
authors.initials: NM
authors.lastname: Williams
mesh_terms: D000818:Animals; D001130:Arizona; D001516:Bees / Q000502:physiology*; D044822:Biodiversity; D057231:Climate Change; D003889:Desert Climate; D055864:Droughts; D004777:Environment; D020387:Food Chain; D032442:Larrea / Q000254:growth & development*; D008800:Mexico; D054817:Pollination; D029862:Prosopis / Q000254:growth & development*; D012621:Seasons; D013045:Species Specificity
references.citation: Ecology. 2007 Jan;88(1):32-6
references.pmid: 17489450
references.citation: Science. 2006 Aug 18;313(5789):940-3
references.pmid: 16825536
references.citation: Evolution. 1997 Jun;51(3):922-936
references.pmid: 28568579
references.citation: Proc Biol Sci. 2000 Feb 7;267(1440):265-71
references.pmid: 10714881
references.citation: Science. 1981 Oct 2;214(4516):82-5
references.pmid: 17802577
references.citation: Science. 2000 Sep 22;289(5487):2068-74
references.pmid: 11000103
references.citation: Ecology. 2007 May;88(5):1086-90
references.pmid: 17536393