Landscape Ecology

, Volume 31, Issue 5, pp 1021–1036 | Cite as

Assessing landscape functional connectivity in a forest carnivore using path selection functions

  • Filipe Carvalho
  • Rafael Carvalho
  • António Mira
  • Pedro Beja
Research Article

Abstract

Context

Understanding connectivity patterns in relation to habitat fragmentation is essential to landscape management. However, connectivity is often judged from expert opinion or species occurrence patterns, with very few studies considering the actual movements of individuals. Path selection functions provide a promising tool to infer functional connectivity from animal movement data, but its practical application remains scanty.

Objectives

We aimed to describe functional connectivity patterns in a forest carnivore using path-level analysis, and to explore how connectivity is affected by land cover patterns and road networks.

Methods

We radiotracked 22 common genets in a mixed forest-agricultural landscape of southern Portugal. We developed path selection functions discriminating between observed and random paths in relation to landscape variables. These functions were used together with land cover information to map conductance surfaces.

Results

Genets moved preferentially within forest patches and close to riparian habitats. Functional connectivity declined with increasing road density, but increased with the proximity of culverts, viaducts and bridges. Functional connectivity was favoured by large forest patches, and by the presence of riparian areas providing corridors within open agricultural land. Roads reduced connectivity by dissecting forest patches, but had less effect on riparian corridors due to the presence of crossing structures.

Conclusions

Genet movements were jointly affected by the spatial distribution of suitable habitats, and the presence of a road network dissecting such habitats and creating obstacles in areas otherwise permeable to animal movement. Overall, the study showed the value of path-level analysis to assess functional connectivity patterns in human-modified landscapes.

Keywords

Conditional logistic regression Forest carnivores Genetta genetta Landscape conductance Movement behaviour Path-level analysis Road ecology 

Supplementary material

10980_2015_326_MOESM1_ESM.docx (22 kb)
Supplementary material 1 (DOCX 22 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Filipe Carvalho
    • 1
    • 2
    • 3
    • 4
  • Rafael Carvalho
    • 1
    • 2
  • António Mira
    • 1
    • 2
  • Pedro Beja
    • 5
  1. 1.Conservation Biology Unit (UBC), Biology DepartmentUniversity of ÉvoraÉvoraPortugal
  2. 2.Research Center in Biodiversity and Genetic Resources (CIBIO/InBIO)University of ÉvoraÉvoraPortugal
  3. 3.Ecosystems Functioning and Conservation (FEC), Institute of Mediterranean Agricultural and Environmental Sciences (ICAAM)University of ÉvoraÉvoraPortugal
  4. 4.Department of Zoology and Entomology, School of Biological and Environmental SciencesUniversity of Fort HareAliceSouth Africa
  5. 5.EDP Biodiversity Chair, Research Center in Biodiversity and Genetic Resources (CIBIO/InBIO)University of PortoVairãoPortugal

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