Show simple item record O’Donnell, Sean
dc.coverage.spatial Costa Rica 2017-03-30T13:36:39Z 2017-03-30T13:36:39Z 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.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

Files in this package

Content in the Dryad Digital Repository is offered "as is." By downloading files, you agree to the Dryad Terms of Service. To the extent possible under law, the authors have waived all copyright and related or neighboring rights to this data. CC0 (opens a new window) Open Data (opens a new window)

Title 29mar17 dryad AA bird flock data
Downloaded 1 time
Description Spreadsheet listing all bird flocks sampled and analyzed in the study, giving dates, locations, bird species, and numbers of individuals.
Download 29mar17 dryad AA bird flock data.xlsx (62.86 Kb)
Details View File Details

Search for data

Be part of Dryad

We encourage organizations to: