Macquarie Island’s northern giant petrels and the impacts of pest eradication on population abundance
2019
Abstract Pest eradication conducted over the years 2010 to 2014 at Macquarie Island successfully eradicated introduced
rabbits,
ratsand mice from this sub-Antarctic island. The initial aerial baiting phase in the winters of 2010 and 2011 resulted in significant mortality of several native
seabirdspecies through primary and secondary ingestion of
brodifacoumbait. A species of key concern is the
northern giant petrel( Macronectes halli ), which, although relatively abundant and increasing on Macquarie Island, is listed as threatened under Australian legislation and was one of the species most affected by poisoning. We use a Bayesian approach to estimate the total mortality and the response of the population to the poisoning event over the short- to medium-term. We then considered how population abundance might respond over the ensuing years. Projections of population trajectories suggest a greater than 50% probability of recovery to the pre‐poisoning levels of 2009
breeding pairsby 2017. This modelling approach could be applied to future planned eradications to quantify the mortality and recovery of incidentally affected populations.
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