Khwaja, N. orcid.org/0000-0003-1314-6984, Preston, S., Hatchwell, B. orcid.org/0000-0002-1039-4782 et al. (1 more author) (2023) Recruitment, survival and breeding success in a declining rifleman population. New Zealand Journal of Ecology, 47 (1). 3507.
Abstract
We used detailed life-history data collected over a six-year period from a colour-banded population of riflemen (Acanthisitta chloris) at Kowhai Bush, Kaikōura, to estimate population vital rates and assess their likely contribution to a concurrent population decline. Both mean juvenile survival (18%) and mean adult survival (49%) were low in comparison with reports from other populations. In contrast, breeding success was high, with pairs producing c. 3 fledglings per season on average. High breeding success was likely associated with nestbox use. We then used survival and breeding success estimates to parameterise a population matrix model, and perturbation analysis of this model confirmed a projected negative trend, with reduced recruitment having the greatest absolute contribution to population decline. We discuss possible explanations for the comparatively low rates of recruitment and survival observed. Data from other populations of riflemen experiencing stable or positive population trajectories would be especially useful to better understand factors affecting vital rates, and to identify the thresholds that signal a rifleman population at risk of decline.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 New Zealand Ecological Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Acanthisitta chloris; Acanthisittidae; Kaikoura; Kowhai Bush; nestbox; population matrix; regrowth; titipounamu; vital rate |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Biosciences (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 21 Feb 2023 15:44 |
Last Modified: | 21 Feb 2023 15:44 |
Status: | Published |
Publisher: | New Zealand Ecological Society |
Refereed: | Yes |
Identification Number: | 10.20417/nzjecol.47.3507 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:196647 |
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Filename: 3507.pdf
