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Landscape Ecology

, Volume 31, Issue 4, pp 775–789 | Cite as

Empirical evaluation of the strength of interspecific competition in shaping small mammal communities in fragmented landscapes

Research Article

Abstract

Context

Theory predicts that habitat loss and fragmentation may have drastic consequences on species’ interactions. To date, however, little empirical evidence exists on the strength of interspecific competition in shaping animal communities in fragmented landscapes.

Objectives

Our aim was to measure the degree of ongoing competitive interference between species in fragmented landscapes. Our model system was the community of ground-dwelling rodents in deciduous woodlands in central Italy, composed of a habitat generalist species (Apodemus sylvaticus) and two forest specialists (Apodemus flavicollis and Myodes glareolus). Our objectives were to test whether species were segregated among forest patches and whether spatial segregation was determined by interspecific competition or habitat and resource availability.

Methods

We surveyed the populations inhabiting 29 woodland patches in a highly fragmented landscape using a capture-mark-recapture protocol, capturing >4500 individuals. First we modelled species’ distribution as a function of habitat, resource availability and landscape variables. The second stage of our analyses involved measuring the response of vital rate parameters (body mass, reproduction, survival, recruitment, population density) to competitor density.

Results

The relative distribution of species reflected a spatial segregation of habitat generalists and specialists according to habitat quality, cover and connectivity. Interspecific competition mainly affected individual level vital rates, whereas we found no substantial effects at the population level.

Conclusions

Competitive exclusion of specialist species by generalist species was occurring. However, when compared to other factors such as habitat connectivity and resource availability, interspecific competition played a relatively minor role in shaping the studied community.

Keywords

Agricultural matrix Hedgerows Landscape mosaic Oak forest Patch size Rodents 

Notes

Acknowledgments

Two anonymous reviewers provided valuable and constructive feedback on our manuscript. We thank all students that helped us with fieldwork. Molecular analyses for the discrimination of Apodemus spp. were carried out by GS, Simona Prete and Emanuela Solano. We also thank Ben Scheele, Jennnifer Pierson e Ayesha Tulloch (The Australian National University) and Marilena Ronzan for language revision. GS was funded by a Ph.D. grant awarded by the University of Rome “La Sapienza”, AM was funded by the CFS (Corpo Forestale dello Stato) through the University of Rome “La Sapienza”.

Supplementary material

10980_2015_286_MOESM1_ESM.docx (40 kb)
Supplementary material 1 (DOCX 39 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Department of Biology and Biotechnology ‘Charles Darwin’Sapienza University of RomeRomeItaly
  2. 2.Fenner School of Environment and Society, Australian Research Council Centre for Environmental Decisions, National Environmental Research ProgramThe Australian National UniversityCanberraAustralia
  3. 3.Department of Wildlife, Fisheries, and Conservation BiologyUniversity of MaineOronoUSA

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