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Long-term trends in the Australaian gannet (Morus serrator) population in Australia: the effect of climate change and commercial fisheries

Bunce, Ashley, Norman, F., Brothers, N. and Gales, R. 2002, Long-term trends in the Australaian gannet (Morus serrator) population in Australia: the effect of climate change and commercial fisheries, Marine biology, vol. 141, no. 2, pp. 263-269, doi: 10.1007/s00227-002-0838-1.

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Title Long-term trends in the Australaian gannet (Morus serrator) population in Australia: the effect of climate change and commercial fisheries
Formatted title Long-term trends in the Australaian gannet (Morus serrator) population in Australia: the effect of climate change and commercial fisheries.
Author(s) Bunce, Ashley
Norman, F.
Brothers, N.
Gales, R.
Journal name Marine biology
Volume number 141
Issue number 2
Start page 263
End page 269
Publisher Springer-Verlag
Place of publication Berlin, Germany
Publication date 2002-08
ISSN 0025-3162
1432-1793
Summary The Australasian gannet (Morus serrator) population has increased considerably over the past century, both in New Zealand and Australia. Since 1980, the population in Australian waters has increased threefold, from 6,600 breeding pairs to approximately 20,000 pairs in 1999-2000, a rate of 6% per year. Reasons for the increase in the Australasian gannet population are poorly understood; here we consider the possible effects of recent fluctuations in climatic and oceanographic conditions, and changes in major local commercial fisheries. A significant trend towards more frequent, and stronger, El Niño Southern Oscillation events, warmer summer sea surface temperatures in Bass Strait, increased annual catches and catch per unit effort in the Victorian pilchard (Sardinops sagax) fishery and potential increased discarding of fisheries bycatch may account for at least some of the observed increase in the Australasian gannet population. The potential interactive effects of these factors on prey distribution and abundance and consequently on gannet numbers are discussed.
Language eng
DOI 10.1007/s00227-002-0838-1
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2002, Springer-Verlag
Persistent URL http://hdl.handle.net/10536/DRO/DU:30001736

Document type: Journal Article
Collection: School of Ecology and Environment
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