Area mediated shifts in bird community composition: A study on a fragmented Mediterranean grassland

Research output: Contribution to journalArticle

Abstract

The effects of habitat fragmentation on birds have often been studied in forest specialist species. Here we aimed at comparing the response of open habitat birds within a range of habitat specialization. The study area was a Mediterranean pseudo-steppe, designated as important for conservation yet fragmented by tree encroachment. We defined bird species dependency on steppe-like habitat by a correspondence analysis, allowing us to distinguish between specialists, generalists and scrubland species. We studied species abundance in relation to fragment area, testing whether species representation in fragments differed from those in continuous habitat. This analysis showed a contrasted response to fragment size between "open habitat" specialist species and generalist ones. Open habitat species were under-represented in the smallest fragments, while generalist were over-represented in small fragments in comparison to their distribution in continuous habitats. We discuss how these results can be linked to species habitat requirements. We find that scrubland species seem to be favoured by encroachment of woody vegetation, as they are able to explore and use the wooded matrix; however specialist species are restricted to open patches and are sensitive to a reduction in patch size. This allows us to predict how different species can exhibit a different sensitivity to habitat fragmentation.

Details

Authors
External organisations
  • Centre d'Ecologie Fonctionnelle et Evolutive (CEFE)
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Zoology
  • Ecology

Keywords

  • Breeding birds, Community composition, Conservation biology, Habitat generalist, Habitat specialist, Mediterranean mountain, Species distribution
Original languageEnglish
Pages (from-to)2979-2995
Number of pages17
JournalBiodiversity and Conservation
Volume18
Issue number11
Publication statusPublished - 2009 Sep
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes