Non-breeding competition between migrant American Redstarts (Setophaga ruticilla) and resident Adelaide's warblers (Dendroica adelaidae) in the Guanica Biosphere Reserve, southwest Puerto Rico

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Non-breeding competition between migrant American Redstarts (Setophaga ruticilla) and resident Adelaide's warblers (Dendroica adelaidae) in the Guanica Biosphere Reserve, southwest Puerto Rico

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/14235

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Title: Non-breeding competition between migrant American Redstarts (Setophaga ruticilla) and resident Adelaide's warblers (Dendroica adelaidae) in the Guanica Biosphere Reserve, southwest Puerto Rico
Author: Toms, Judith D.
Keywords: interspecific competition
foraging niche
arthropod phenology
interspecific territoriality
Adelaide's warbler
Date: 2011
Publisher: University of Missouri--Columbia
Abstract: I tested the hypothesis that migratory American Redstarts (Redstart; Setophaga ruticilla) and resident Adelaide's Warbler (Adelaide's; Dendroica adelaidae) compete for food in a dry forest of southwest Puerto Rico. Competition will not occur unless food is limiting and the foraging niche of the two species is similar. In dry years, total arthropod biomass declined and body condition of both species decreased. Moreover, these species had a very high degree of overlap in both foraging location and type of attack. Simulated territorial intrusions also indicated that these species are competing. However, Adelaide's did not shift their foraging niche after Redstarts left and these species were not interspecifically territorial. Therefore, neither depletion nor interference competition is occurring. Instead, the evidence suggests that Redstarts listen to the frequent vocalizations of Adelaide's, and forage using temporary competition refuges.
URI: http://hdl.handle.net/10355/14235
Other Identifiers: TomsJ-072011-D182

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