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Observations of Glaucous-winged Gulls preying on passerines at a Pacific Northwest colony


Nietlisbach, Pirmin; Germain, Ryan R; Bousquet, Christophe A H (2014). Observations of Glaucous-winged Gulls preying on passerines at a Pacific Northwest colony. Wilson Journal of Ornithology, 126(1):155-158.

Abstract

Breeding within a seabird colony can have positive and negative effects for smaller passerine species. For example, they may profit from the anti-predator behavior of the seabirds as well as from the influx of food and nutrients brought into the community. However, these possible benefits might be offset by seabird predation. For instance, gulls are not only fierce defenders of their colony, but also opportunistic feeders. Here, we report predation of Glaucous-winged Gulls (Larus glaucescens) on Sooty Fox Sparrows (Passerella iliaca fuliginosa), Song Sparrows (Melospiza melodia), and a European Starling (Sturnus vulgaris), observed on Mandarte Island, British Columbia, Canada. These observations provide new evidence for dietary supplements of Glaucous-winged Gulls and for a disadvantage of passerine life in a Glaucous-winged Gull colony.

Abstract

Breeding within a seabird colony can have positive and negative effects for smaller passerine species. For example, they may profit from the anti-predator behavior of the seabirds as well as from the influx of food and nutrients brought into the community. However, these possible benefits might be offset by seabird predation. For instance, gulls are not only fierce defenders of their colony, but also opportunistic feeders. Here, we report predation of Glaucous-winged Gulls (Larus glaucescens) on Sooty Fox Sparrows (Passerella iliaca fuliginosa), Song Sparrows (Melospiza melodia), and a European Starling (Sturnus vulgaris), observed on Mandarte Island, British Columbia, Canada. These observations provide new evidence for dietary supplements of Glaucous-winged Gulls and for a disadvantage of passerine life in a Glaucous-winged Gull colony.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:2014
Deposited On:29 Nov 2013 15:33
Last Modified:05 Apr 2016 17:12
Publisher:Wilson Ornithological Society
ISSN:1559-4491
Publisher DOI:https://doi.org/10.1676/13-077.1

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