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Oecologia

, Volume 172, Issue 3, pp 737–749 | Cite as

Anthropogenic subsidies mitigate environmental variability for insular rodents

  • Lise RuffinoEmail author
  • James Russell
  • Eric Vidal
Population ecology - Original research

Abstract

The exogenous input of nutrients and energy into island systems fuels a large array of consumers and drives bottom-up trophic cascades in island communities. The input of anthropogenic resources has increased on islands and particularly supplemented non-native consumers with extra resources. We test the hypothesis that the anthropogenic establishments of super-abundant gulls and invasive iceplants Carpobrotus spp. have both altered the dynamics of an introduced black rat Rattus rattus population. On Bagaud Island, two habitats have been substantially modified by the anthropogenic subsidies of gulls and iceplants, in contrast to the native Mediterranean scrubland with no anthropogenic inputs. Rats were trapped in all three habitats over two contrasting years of rainfall patterns to investigate: (1) the effect of anthropogenic subsidies on rat density, age-ratio and growth rates, and (2) the role of rainfall variability in modulating the effects of subsidies between years. We found that the growth rates of rats dwelling in the non-subsidized habitat varied with environmental fluctuation, whereas rats dwelling in the gull colony maintained high growth rates during both dry and rainy years. The presence of anthropogenic subsidies apparently mitigated environmental stress. Age ratio and rat density varied significantly and predictably among years, seasons, and habitats. While rat densities always peaked higher in the gull colony, especially after rat breeding in spring, higher captures of immature rats were recorded during the second year in all habitats, associated with higher rainfall. The potential for non-native rats to benefit from anthropogenic resources has important implications for the management of similar species on islands.

Keywords

Anthropogenic resources Mediterranean islands Population dynamics Rattus rattus Trophic subsidies 

Notes

Acknowledgments

We would like to thank all the people who help in the field and during laboratory work. We specially thank all the PCNP staff who enabled this long-term study on the natural reserve of Bagaud Island. Research was funded by the ‘Agence Nationale pour la Recherche’ (ANR) with program ‘ALIENS’. Funds were provided by a PhD fellowship granted by ‘Ecole Doctorale des Sciences de l’Environement’ to L.R., a postdoctoral fellowship granted by the New Zealand Foundation for Research, Science and Technology to J.C.R.

Supplementary material

442_2012_2545_MOESM1_ESM.doc (93 kb)
Supplementary material 1 (DOC 93 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Department of Biology, Section of EcologyUniversity of TurkuTurkuFinland
  2. 2.IMBE, UMR CNRS7273/IRD237/Aix-Marseille UniversityAix-en-Provence Cédex 04France
  3. 3.School of Biological Sciences and Department of StatisticsUniversity of AucklandAucklandNew Zealand
  4. 4.IMBE, UMR CNRS 7263/IRD 237/AMU Centre IRD de NoumeaNoumea cedexFrance

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