Grey-faced petrel (Pterodroma gouldi) productivity unaffected by kiore (Pacific rats, Rattus exulans) on a New Zealand offshore island

Burrow-nesting seabird populations are vulnerable to predation by introduced rats, because of their nesting habits and slow life histories. We investigated whether control of kiore (Pacific rats, Rattus exulans) by removal trapping, and during an unsuccessful community-led island-wide eradication at...

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Veröffentlicht in:New Zealand journal of zoology 2015-07, Vol.42 (3), p.131-144
Hauptverfasser: Jones, C, Lyver, P, Whitehead, A, Forrester, G, Parkes, J, Sheehan, M
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container_end_page 144
container_issue 3
container_start_page 131
container_title New Zealand journal of zoology
container_volume 42
creator Jones, C
Lyver, P
Whitehead, A
Forrester, G
Parkes, J
Sheehan, M
description Burrow-nesting seabird populations are vulnerable to predation by introduced rats, because of their nesting habits and slow life histories. We investigated whether control of kiore (Pacific rats, Rattus exulans) by removal trapping, and during an unsuccessful community-led island-wide eradication attempt, had any effects on nest survival of grey-faced petrels (Pterodroma gouldi) on Ririwha (Stephenson Island), northeastern New Zealand. We compared nest survival between two plots at which rats were trapped and six un-trapped plots in 2010, as well as at all plots during and after the poisoning programme in 2011-2012. Neither mean rates of breeding burrow occupancy nor nest survival differed between trapped and un-trapped plots in 2010. We found no significant differences between years or between plots throughout the poisoning programme. Extrapolation of daily nest survival rates to the full 172-day combined egg and chick period gave an estimate of mean annual productivity for all plots combined of 0.285 (95% confidence interval 0.252-0.318), which is higher than on comparable predator-free islands. Although the absence of a detectable effect of kiore on breeding grey-faced petrels on Ririwha is reassuring, we can be less sure that smaller burrow-nesting seabirds on the island are secure.
doi_str_mv 10.1080/03014223.2015.1048809
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source Royal Society of New Zealand Open Access Journals; EZB-FREE-00999 freely available EZB journals
subjects Confidence intervals
Marine
nest survival
New Zealand
pest eradication
Poisoning
Procellariidae
Productivity
Pterodroma
Rattus exulans
rodent
seabird
title Grey-faced petrel (Pterodroma gouldi) productivity unaffected by kiore (Pacific rats, Rattus exulans) on a New Zealand offshore island
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