Corvids congregate to breeding colonies of a burrow-nesting seabird

Ekanayake, Kasun B., Weston, Michael A., Dann, Peter and Sutherland, Duncan R. 2016, Corvids congregate to breeding colonies of a burrow-nesting seabird, Austral ecology: a journal of ecology in the Southern Hemisphere, vol. 41, no. 3, pp. 291-301, doi: 10.1111/aec.12311.

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Title Corvids congregate to breeding colonies of a burrow-nesting seabird
Author(s) Ekanayake, Kasun B.
Weston, Michael A.ORCID iD for Weston, Michael A.
Dann, Peter
Sutherland, Duncan R.
Journal name Austral ecology: a journal of ecology in the Southern Hemisphere
Volume number 41
Issue number 3
Start page 291
End page 301
Total pages 11
Publisher Wiley
Place of publication Chichester, Eng.
Publication date 2016-05
ISSN 1442-9985
Keyword(s) Aggregate
Egg predation
Little penguin
Little raven
Phillip Island
Summary Egg predation is a major cause of reproductive failure among birds, and can compromise the viability of affected populations. Some egg predators aggregate near colonially breeding birds to exploit the seasonal increase of prey resources. We investigated spatial and temporal variations in the abundance of an egg predator (little raven Corvus mellori; Corvidae) to identify whether ravens aggregate spatially or temporally to coincide with any of three potential prey species: burrow-nesting little penguin (Eudyptula minor; Spheniscidae), short-tailed shearwater (Ardenna tenuirostris; Procellariidae), and surface-nesting silver gull (Chroicocephalus novaehollandiae; Laridae). We derived spatially explicit density estimates of little ravens using distance sampling along line transects throughout a calendar year, which encompassed little penguin, short-tailed shearwater and silver gull breeding and non-breeding seasons. High raven abundance coincided temporally with penguin and gull egg laying periods but not with that of shearwaters. The spatial distribution of raven density corresponded with the little penguin colony but not with shearwater or gull colonies. Thus, the presence of little penguin eggs in burrows correlated strongly with little raven activity, and this implies that little ravens may have learnt to exploit the plentiful subsurface food resource of little penguin eggs. Corvid management may be required to maintain the viability of this socially and economically important penguin colony.
Language eng
DOI 10.1111/aec.12311
Field of Research 050211 Wildlife and Habitat Management
Socio Economic Objective 960402 Control of Animal Pests
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Ecological Society of Australia
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