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Impacts of major predators on tropical agroforest arthropods: comparisons within and across taxa

dc.contributor.authorGreenberg, Russellen_US
dc.contributor.authorPhilpott, Stacy M.en_US
dc.contributor.authorBichier, Peteren_US
dc.contributor.authorPerfecto, Ivetteen_US
dc.date.accessioned2006-09-11T19:17:54Z
dc.date.available2006-09-11T19:17:54Z
dc.date.issued2004-06en_US
dc.identifier.citationPhilpott, Stacy M.; Greenberg, Russell; Bichier, Peter; Perfecto, Ivette; (2004). "Impacts of major predators on tropical agroforest arthropods: comparisons within and across taxa." Oecologia 140(1): 140-149. <http://hdl.handle.net/2027.42/47705>en_US
dc.identifier.issn1432-1939en_US
dc.identifier.issn0029-8549en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/47705
dc.identifier.urihttp://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=15095089&dopt=citationen_US
dc.description.abstractIn food web studies, taxonomically unrelated predators are often grouped into trophic levels regardless of their relative importance on prey assemblages, multiple predator effects, or interactions such as omnivory. Ants and birds are important predators likely to differentially shape arthropod assemblages, but no studies have compared their effects on a shared prey base. In two separate studies, we excluded birds and ants from branches of a canopy tree ( Inga micheliana ) in a coffee farm in Mexico for 2 months in the dry and wet seasons of 2002. We investigated changes in arthropod densities with and without predation pressure from (1) birds and (2) ant assemblages dominated by one of two ant species ( Azteca instabilis and Camponotus senex ). We first analyzed individual effects of each predator (birds, Azteca instabilis , and C. senex ) then used a per day effect metric to compare differences in effects across (birds vs ants) and within predator taxa (the two ant species). Individually, birds reduced densities of total and large arthropods and some arthropod orders (e. g., spiders, beetles, roaches) in both seasons. Azteca instabilis did not significantly affect arthropods (total, small, large or specific orders). Camponotus senex , however, tended to remove arthropods (total, small), especially in the dry season, and affected arthropod densities of some orders both positively and negatively. Predators greatly differed in their effects on Inga arthropods (for all, small, large, and individual orders of arthropods) both in sign (±) and magnitudes of effects. Birds had stronger negative effects on arthropods than ants and the two dominant ant species had stronger effects on arthropods in different seasons. Our results show that aggregating taxonomically related and unrelated predators into trophic levels without prior experimental data quantifying the sign and strengths of effects may lead to a misrepresentation of food web interactions.en_US
dc.format.extent188179 bytes
dc.format.extent3115 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherSpringer-Verlagen_US
dc.subject.otherMulti-trophic Interactionsen_US
dc.subject.otherCoffee Agroecosystemsen_US
dc.subject.otherBirdsen_US
dc.subject.otherFood Websen_US
dc.subject.otherLifeSciencesen_US
dc.subject.otherDominant Arboreal Antsen_US
dc.titleImpacts of major predators on tropical agroforest arthropods: comparisons within and across taxaen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelNatural Resources and Environmenten_US
dc.subject.hlbsecondlevelMolecular, Cellular and Developmental Biologyen_US
dc.subject.hlbsecondlevelEcology and Evolutionary Biologyen_US
dc.subject.hlbtoplevelHealth Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Ecology and Evolutionary Biology, University of Michigan, 830 N. University, Ann Arbor, MI 48109, USA,en_US
dc.contributor.affiliationumSchool of Natural Resources and the Environment, University of Michigan, 430 E. University, Ann Arbor, MI 48109, USA,en_US
dc.contributor.affiliationotherSmithsonian Migratory Bird Center, National Zoo, 3001 Connecticut Ave NW, Washington, DC 20008, USA,en_US
dc.contributor.affiliationotherSmithsonian Migratory Bird Center, National Zoo, 3001 Connecticut Ave NW, Washington, DC 20008, USA,en_US
dc.contributor.affiliationumcampusAnn Arboren_US
dc.identifier.pmid15095089en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/47705/1/442_2004_Article_1561.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1007/s00442-004-1561-zen_US
dc.identifier.sourceOecologiaen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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