The significance of northern-central Bass Strait in south-eastern Australia as habitat for burrowing seabirds
Nicole Schumann A C , Peter Dann B and John P. Y. Arnould A
+ Author Affiliations
- Author Affiliations
A School of Life and Environmental Sciences, Deakin University, 221 Burwood Highway, Burwood, Vic. 3125, Australia.
B Research Department, Phillip Island Nature Parks, PO Box 97, Cowes, Vic. 3922, Australia.
C Corresponding author. Email: nschumann@gmail.com
Emu 114(3) 234-240 https://doi.org/10.1071/MU13048
Submitted: 29 May 2013 Accepted: 20 December 2013 Published: 12 May 2014
Abstract
The present study provides the first complete estimate of the abundance and distribution of burrowing seabirds in northern-central Bass Strait, a key region for breeding seabirds in south-eastern Australia. The estimated total number of breeding burrows in the region in 2008–11 were 755 300 ± 32 400 (s.e.) burrows of Short-tailed Shearwaters (Ardenna tenuirostris), 26 700 ± 3500 of Little Penguins (Eudyptula minor), 19 100 ± 2200 of Common Diving-Petrels (Pelecanoides urinatrix) and 4200 ± 2700 of Fairy Prions (Pachyptila turtur). These represent substantial proportions of the total estimated Australian breeding populations of these species: 6% of the total population of Short-tailed Shearwaters, 14% of Little Penguins, 0.4% of Fairy Prions and 13% of Common Diving-Petrels. Based on the number of active burrows, the number of breeding Short-tailed Shearwaters in the region is estimated to have decreased 35% between 1978–80 and 2008–11, equivalent to a decrease of 1.4% per annum between 1980 and 2011. The regional population of Little Penguins, however, appears to have increased substantially over the same period. Identification of population trends of the other species is limited by a lack of previous data. The importance of this area for burrowing seabirds and the substantial decline in numbers of Short-tailed Shearwaters warrants more frequent monitoring of the abundance of seabirds in the region to allow a robust comparison of changes in populations over time as well as the identification of possible causative factors.
Additional keywords: abundance, breeding distribution.
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