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Alien mammal assemblage effects on burrow occupancy and hatching success of the vulnerable pink-footed shearwater in Chile

Published online by Cambridge University Press:  22 April 2020

Pablo García-Díaz*
Affiliation:
Manaaki Whenua – Landcare Research, PO Box 69040, Lincoln7640, New Zealand School of Biological Sciences, Zoology Building, University of Aberdeen, AberdeenAB24 2TZ, UK
Peter Hodum
Affiliation:
Oikonos Ecosystem Knowledge, Región de Valparaíso, Valparaíso, Chile University of Puget Sound, Tacoma, WA, USA
Valentina Colodro
Affiliation:
Oikonos Ecosystem Knowledge, Región de Valparaíso, Valparaíso, Chile
Michelle Hester
Affiliation:
Oikonos Ecosystem Knowledge, Región de Valparaíso, Valparaíso, Chile
Ryan D Carle
Affiliation:
Oikonos Ecosystem Knowledge, Región de Valparaíso, Valparaíso, Chile
*
Author for correspondence: Dr Pablo García-Díaz, Email: pablo.garciadiaz@abdn.ac.uk

Summary

Alien species are a driver of biodiversity loss, with impacts of different aliens on native species varying considerably. Identifying the contributions of alien species to native species declines could help target management efforts. Globally, seabirds breeding on islands have proven to be highly susceptible to alien species. The breeding colonies of the pink-footed shearwater (Ardenna creatopus) are threatened by the negative impacts of alien mammals. We combined breeding monitoring data with a hierarchical model to separate the effects of different alien mammal assemblages on the burrow occupancy and hatching success of the pink-footed shearwater in the Juan Fernández Archipelago, Chile. We show that alien mammals affected the rates of burrow occupancy, but had little effect on hatching success. Rabbits produced the highest negative impacts on burrow occupancy, whereas the effects of other alien mammals were more uncertain. In addition, we found differences in burrow occupancy between islands regardless of their alien mammal assemblages. Managing rabbits will improve the reproductive performance of this shearwater, but research is needed to clarify the mechanisms by which alien mammals affect the shearwaters and to explain why burrow occupancy varies between islands.

Type
Research Paper
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Foundation for Environmental Conservation

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