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Birds as predators in tropical agroforestry systems

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dc.contributor.author Van Bael, Sunshine A. en
dc.contributor.author Philpott, Stacy M. en
dc.contributor.author Greenberg, Russell S. en
dc.contributor.author Bichier, Peter en
dc.contributor.author Barber, Nicholas A. en
dc.contributor.author Mooney, Kailen A. en
dc.contributor.author Gruner, Daniel S. en
dc.date.accessioned 2009-08-12T19:30:07Z
dc.date.available 2009-08-12T19:30:07Z
dc.date.issued 2008
dc.identifier.citation Van Bael, Sunshine A., Philpott, Stacy M., Greenberg, Russell S., Bichier, Peter, Barber, Nicholas A., Mooney, Kailen A., and Gruner, Daniel S. 2008. "<a href="https://repository.si.edu/handle/10088/7966">Birds as predators in tropical agroforestry systems</a>." <em>Ecology</em>. 89 (4):928-934. <a href="https://doi.org/10.1890/06-1976.1">https://doi.org/10.1890/06-1976.1</a> en
dc.identifier.issn 0012-9658
dc.identifier.uri http://hdl.handle.net/10088/7966
dc.description.abstract Insectivorous birds reduce arthropod abundances and their damage to plants in some, but not all, studies where predation by birds has been assessed. The variation in bird effects may be due to characteristics such as plant productivity or quality, habitat complexity, and/or species diversity of predator and prey assemblages. Since agroforestry systems vary in such characteristics, these systems provide a good starting point for understanding when and where we can expect predation by birds to be important. We analyze data from bird exclosure studies in forests and agroforestry systems to ask whether birds consistently reduce their arthropod prey base and whether bird predation differs between forests and agroforestry systems. Further, we focus on agroforestry systems to ask whether the magnitude of bird predation (1) differs between canopy trees and understory plants, (2) differs when migratory birds are present or absent, and (3) correlates with bird abundance and diversity. We found that, across all studies, birds reduce all arthropods, herbivores, carnivores, and plant damage. We observed no difference in the magnitude of bird effects between agroforestry systems and forests despite simplified habitat structure and plant diversity in agroforests. Within agroforestry systems, bird reduction of arthropods was greater in the canopy than the crop layer. Top-down effects of bird predation were especially strong during censuses when migratory birds were present in agroforestry systems. Importantly, the diversity of the predator assemblage correlated with the magnitude of predator effects; where the diversity of birds, especially migratory birds, was greater, birds reduced arthropod densities to a greater extent. We outline potential mechanisms for relationships between bird predator, insect prey, and habitat characteristics, and we suggest future studies using tropical agroforests as a model system to further test these areas of ecological theory. en
dc.format.extent 102886 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartof Ecology en
dc.title Birds as predators in tropical agroforestry systems en
dc.type Journal Article en
dc.identifier.srbnumber 74411
dc.identifier.doi 10.1890/06-1976.1
rft.jtitle Ecology
rft.volume 89
rft.issue 4
rft.spage 928-934
dc.description.SIUnit NH-EOL en
dc.description.SIUnit STRI en
dc.description.SIUnit NZP en
dc.description.SIUnit mbc en
dc.citation.spage 928-934

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