Population decline of the noisy scrub-bird is not correlated with territory size, marginal declines in rainfall or fire impacts
J. Dale Roberts
A F , Alan Danks B , Abby Berryman B , Nadisha Sidhu C D , Allan H. Burbidge E and Sarah Comer B
+ Author Affiliations
- Author Affiliations
A School of Biological Sciences and Centre for Evolutionary Biology, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
B Department of Biodiversity, Conservation and Attractions, Parks and Wildlife Service, 120 Albany Highway, Albany, WA 6330, Australia.
C School of Agriculture and Environment, University of Western Australia, PO Box 5771, Albany, WA 6332, Australia.
D Bristol Veterinary School, University of Bristol, Langford House, Langford, Bristol BS40 5DU, UK.
E Department of Biodiversity, Conservation and Attractions, Biodiversity and Conservation Science, Locked Bag 104, Bentley, WA 6983, Australia.
F Corresponding author. Email: dale.roberts@uwa.edu.au
Pacific Conservation Biology 26(3) 230-238 https://doi.org/10.1071/PC19029
Submitted: 20 July 2019 Accepted: 20 October 2019 Published: 5 December 2019
Abstract
The noisy scrub-bird is endangered and confined to one natural population on Mount Gardner and several translocated populations east of Albany, Western Australia. Annual monitoring of the number of singing males at Mount Gardner since 1966 indicates a steady rise in numbers, peaking at 179 birds in 1994 followed by a less regular decline to 19 by 2017. The Lakes, an adjacent location, had a similar pattern of increase from the early 1970s then irregular decline from the mid-1980s. Broken stick regression models confirmed that both apparent patterns represented significant increase then decline in the number of singing males. Territory size estimates from 1994, 2005 and 2014 suggest an increase in size of territories over time but that pattern was not significant when only common territories were compared. Variance in bird numbers was not correlated with annual rainfall, which has broadly declined over the study period, or with number of rain days. We discuss five possible causes of decline: (1) inbreeding, (2) control of exotic predators and associated impact on non-target, natural predators, (3) resource/food availability (which may interact with rainfall), (4) removal of birds for introduction programs, and (5) the absence of wildfire and associated changes (senescence) in vegetation. None are compelling, single explanations for decline but their collective impact may be high. Survival of the noisy scrub-bird may be increasingly dependent on the introduced, managed populations of this species at Mount Manypeaks and on Bald Island.
Additional keywords: breeding success, long-term monitoring, translocation.
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