Decoupling Fragmentation from Habitat Loss for Spiders in Patchy Agricultural Landscapes

Yoni Gavish, Yaron Ziv, Michael L. Rosenzweig

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Habitat loss reduces species diversity, but the effect of habitat fragmentation on number of species is less clear because fragmentation generally accompanies loss of habitat. We compared four methods that aim to decouple the effects of fragmentation from the effects of habitat loss. Two methods are based on species-area relations, one on Fisher's alpha index of diversity, and one on plots of cumulative number of species detected against cumulative area sampled. We used these methods to analyze the species diversity of spiders in 2, 3.2 × 4 km agricultural landscapes in Southern Judea Lowlands, Israel. Spider diversity increased as fragmentation increased with all four methods, probably not because of the additive within-patch processes, such as edge effect and heterogeneity. The positive relation between fragmentation and species diversity might reflect that most species can disperse through the fields during the wheat-growing season. We suggest that if a given area was designated for the conservation of spiders in Southern Judea Lowlands, Israel, a set of several small patches may maximize species diversity over time.

Original languageEnglish (US)
Pages (from-to)150-159
Number of pages10
JournalConservation Biology
Volume26
Issue number1
DOIs
StatePublished - Feb 1 2012

Keywords

  • Arthropods
  • Landscape
  • SLOSS
  • Species diversity
  • Species-area relation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

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