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Aggressiveness of breeding territorial honeyeaters corresponds to seasonal changes in nectar availability

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Summary

On the east coast of Australia, new holland and white-cheeked honeyeaters experience huge seasonal changes in nectar availability over their breeding periods. I observed breeding males of both species to determine whether levels of territorial aggressiveness varied with these changes in nectar availability. I watched individual males repeatedly and assessed their aggressiveness by recording their responses to birds that came within 30 m of them. Almost all attacks were on unfamiliar birds; males never attacked their mates or offspring and rarely attacked other birds that were resident in the area. Intruders were most likely to be attacked if they were conspecifics, if they landed rather than flying by, and if they came near the centers of males' territories. Taking into account the types, behaviors, and locations of intruders, there were pronounced seasonal changes in the probability of an intruder being attacked by a territorial male. Males were least aggressive when nectar was abundant, suggesting that territorial aggression could be at least partially a response to scarcity of nectar. Seasonal changes in aggressiveness were not accounted for by breeding cycles or by changes in frequency of intrusions.

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  1. Doug P. Armstrong

    Present address: School of Biological Sciences, Macquarie University, 2109, NSW, Australia

Authors and Affiliations

  1. School of Biological Sciences A08, University of Sydney, 2006, NSW, Australia

    Doug P. Armstrong

  2. Division of Environmental Sciences, The Australian Museum, 6-8 College St., 2000, Sydney, NSW, Australia

    Doug P. Armstrong

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  1. Doug P. Armstrong
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Armstrong, D.P. Aggressiveness of breeding territorial honeyeaters corresponds to seasonal changes in nectar availability. Behav Ecol Sociobiol 29, 103–111 (1991). https://doi.org/10.1007/BF00166484

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