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1 November 2012 Variation in Aggression of Black-Throated Blue Warblers Wintering in Jamaica
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Variation in aggression among birds on different territories has been hypothesized to be influenced by intrinsic factors such as a bird's age, sex, or size and extrinsic factors such as density of neighbors, abundance of food, or territory size. However, little work has examined how and why aggression may vary within a bird's home range. We examined variation in aggressive behaviors of nonbreeding Black-throated Blue Warblers (Setophaga caerulescens) in Jamaican coffee farms by using experimentally simulated intrusions into home ranges. Our multivariate models confirmed that multiple variables associated with aggression included sex, home range size, proximity of intrusion to home range center, and the presence of another aggressive bird in the area. In addition, we found that birds responded more aggressively to intrusions in shade trees, where insects were more abundant, than in the understory of coffee or of small patches of remnant forest. These results suggest the birds responded to variation in habitat and/or food supply within their home ranges and varied aggressive responses accordingly, revealing a finer scale of behavioral resource matching than previously documented for bird territoriality.

© 2012 by The Cooper Ornithological Society. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website,
Chris J. Smith, Matthew D. Johnson, Brent R. Campos, and Caitlyn M. Bishop "Variation in Aggression of Black-Throated Blue Warblers Wintering in Jamaica," The Condor 114(4), 831-839, (1 November 2012).
Received: 10 November 2011; Accepted: 16 March 2012; Published: 1 November 2012

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