Biological Invasions

, Volume 15, Issue 1, pp 143–155

Studying the effects of multiple invasive mammals on Cory’s shearwater nest survival

  • S. Hervías
  • A. Henriques
  • N. Oliveira
  • T. Pipa
  • H. Cowen
  • J. A. Ramos
  • M. Nogales
  • P. Geraldes
  • C. Silva
  • R. Ruiz de Ybáñez
  • S. Oppel
Original Paper

Abstract

The most common invasive mammals—mice, rats, and cats—have been introduced to islands around the world, where they continue to negatively affect native biodiversity. The eradication of those invasive mammals has had positive effects on many species of seabirds. However, the removal of one invasive mammal species may result in abundance changes of other species due to trophic and competitive interactions among species. Understanding the overall impact of several invasive species is a key challenge when evaluating the possible effects of eradication programmes. Here we assess the influence of the three most common invasive mammals on nest survival of Cory’s shearwater (Calonectris diomedea). We monitored six breeding colonies over 3 years and measured the activity of mice, rats and cats to examine the influence of invasive mammals on nest survival. We found that nest survival showed a similar temporal trend in all years, with lowest weekly survival probabilities shortly after chicks hatched. Cats were identified as major predators of chicks, but no measure of colony-specific cat activity was able to adequately explain variation in shearwater nest survival. Nest survival was on average 0.38 (95 % confidence interval 0.20–0.53) and varied among colonies as well as over time. We found a small positive influence of rats on nest survival, which may indicate that the presence of small rodents as alternative prey may reduce cat predation of chicks. Our findings suggest that the eradication of rodents alone may exacerbate the adverse effects of cats on shearwater nest survival.

Keywords

Nest survival Feral cats Rats Interaction among predators Macaronesian islands Procellariiformes 

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • S. Hervías
    • 1
    • 2
    • 3
  • A. Henriques
    • 1
  • N. Oliveira
    • 1
  • T. Pipa
    • 1
  • H. Cowen
    • 4
  • J. A. Ramos
    • 5
  • M. Nogales
    • 3
  • P. Geraldes
    • 1
  • C. Silva
    • 1
  • R. Ruiz de Ybáñez
    • 2
  • S. Oppel
    • 6
  1. 1.Portuguese Society for the Study of BirdsLisbonPortugal
  2. 2.Department of Animal Health, Faculty of VeterinaryUniversity of MurciaEspinardo, MurciaSpain
  3. 3.Island Ecology and Evolution Research GroupLa Laguna, Tenerife, Canary IslandsSpain
  4. 4.Department of ZoologyUniversity of CambridgeCambridgeUK
  5. 5.Department of Life Sciences, Institute of Marine ResearchUniversity of CoimbraCoimbraPortugal
  6. 6.Royal Society for the Protection of Birds, The Lodge, SandyBedfordshireUK

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