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dc.contributor.author O’Donnell, Sean
dc.coverage.spatial Costa Rica
dc.date.accessioned 2017-03-30T13:36:39Z
dc.date.available 2017-03-30T13:36:39Z
dc.date.issued 2017-06-19
dc.identifier doi:10.5061/dryad.bb67v
dc.identifier.citation O'Donnell S (2017) Evidence for facilitation among avian army-ant attendants: specialization and species associations across elevations. Biotropica 49(5): 665-674.
dc.identifier.issn 0006-3606
dc.identifier.uri http://hdl.handle.net/10255/dryad.141902
dc.description Mixed-species assemblages can involve positive and negative interactions, but uncertainty about high-value patchy resources can increase the value of information sharing among heterospecific co-foragers. I sampled species composition of bird-flocks attending army-ant raids in three adjacent elevation zones in Costa Rica, across multiple years, to test for positive and negative associations among raid-attending bird species. My goal was to test whether the most frequent and specialized raid-attending species showed evidence of facilitating or excluding other bird species. I quantified elevational variation in avian community composition at raids, then asked whether species composition was associated with variation in flock characteristics (flock size and species richness). I identified the most frequent raid-attending species (those that attended raids most frequently relative to their mist-net capture rates), and bird species that performed specialized army ant-following behavior (bivouac-checking, which allows birds to memorize and track mobile army-ant colonies). There was significant turnover of bird species among zones (including the frequent and specialized attendants); patterns of species overlap suggested a gradual transition from a Pacific-slope to an Atlantic-slope raid-attending bird fauna. Raid-attendance frequency was positively correlated with bivouac-checking behavior. With few exceptions, the most frequent raid-attending bird species, and the bivouac-checking species, also participated in the most species-rich flocks. High species-gregariousness suggests many of the frequently attending and/or bivouac-checking species functioned as core flock members. However, some bird species pairs were significantly negatively associated at raids. Despite species turnover, per-flock numbers of birds at raids did not differ among geographic zones, but flocks on the Pacific-slope were heavier because larger bodied bird species attended raids. Previous studies showed that the size (biomass) of bird-flocks corresponds to the amount of food the birds kleptoparasitize from ant raids, and the heavier Pacific-slope bird-flocks could have greater negative kleptoparasitic impacts.
dc.relation.haspart doi:10.5061/dryad.bb67v/1
dc.relation.isreferencedby doi:10.1111/btp.12452
dc.subject bivouac-checking
dc.subject elevational gradient
dc.subject multi-species associations
dc.subject montane forest
dc.subject social network analysis
dc.title Data from: Evidence for facilitation among avian army-ant attendants: specialization and species associations across elevations
dc.type Article
dc.contributor.correspondingAuthor O’Donnell, Sean
prism.publicationName Biotropica

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Title 29mar17 dryad AA bird flock data
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Description Spreadsheet listing all bird flocks sampled and analyzed in the study, giving dates, locations, bird species, and numbers of individuals.
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