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Population status of four endemic land bird species after an unsuccessful rodent eradication on Henderson Island


Bond, AL and Brooke, MDL and Cuthbert, RJ and Lavers, JL and McClelland, GTW and Churchyard, T and Donaldson, A and Duffield, N and Forrest, A and Harrison, G and MacKinnon, L and Proud, T and Skinner, A and Torr, N and Vickery, JA and Oppel, S, Population status of four endemic land bird species after an unsuccessful rodent eradication on Henderson Island, Bird Conservation International, 29, (1) pp. 124-135. ISSN 0959-2709 (2018) [Refereed Article]

Copyright Statement

BirdLife International, 2018

DOI: doi:10.1017/S0959270918000072


Invasive rodents detrimentally affect native bird species on many islands worldwide, and rodent eradication is a useful tool to safeguard endemic and threatened species. However, especially on tropical islands, rodent eradications can fail for various reasons, and it is unclear whether the temporary reduction of a rodent population during an unsuccessful eradication operation has beneficial effects on native birds. Here we examine the response of four endemic land bird species on subtropical Henderson Island in the Pitcairn Island Group, South Pacific Ocean, following an unsuccessful rodent eradication in 2011. We conducted point counts at 25 sampling locations in 14 survey periods between 2011 and 2015, and modelled the abundance trends of all species using binomial mixture models accounting for observer and environmental variation in detection probability. Henderson Reed Warbler Acrocephalus taiti more than doubled in abundance (2015 population estimate: 7,194-28,776), and Henderson Fruit Dove Ptilinopus insularis increased slightly between 2011 and 2015 (2015 population estimate: 4,47610,072), while we detected no change in abundance of the Henderson Lorikeet Vini stepheni (2015 population estimate: 5543014). Henderson Crake Zapornia atra increased to pre-eradication levels following anticipated mortality during the operation (2015 population estimate: 4,96020,783). A temporary reduction of rat predation pressure and rat competition for fruit may have benefitted the reed warbler and the fruit dove, respectively. However, a long drought may have naturally suppressed bird populations prior to the rat eradication operation in 2011, potentially confounding the effects of temporary rat reduction and natural recovery. We therefore cannot unequivocally ascribe the population recovery to the temporary reduction of the rat population. We encourage robust monitoring of island biodiversity both before and after any management operation to better understand responses of endemic species to failed or successful operations.

Item Details

Item Type:Refereed Article
Keywords:island restoration, invasive species, population recovery, introduced rodents
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Conservation and biodiversity
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:Lavers, JL (Dr Jennifer Lavers)
ID Code:125325
Year Published:2018
Web of Science® Times Cited:1
Deposited By:Ecology and Biodiversity
Deposited On:2018-04-12
Last Modified:2022-07-05

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