NDLI: Matrix quality and habitat configuration interactively determine functional connectivity in a widespread bush cricket at a small spatial scale

Content Provider	Springer Nature Link
Author	Lange, Rebecca Diekötter, Tim Schiffmann, Lisa A. Wolters, Volkmar Durka, Walter
Copyright Year	2011
Abstract	Unlike rare or specialised species, widespread abundant species have often been neglected when studying effects of habitat fragmentation. However, recently, it was shown that in the widespread abundant bush cricket Pholidoptera griseoaptera gene flow becomes restricted when the share of suitable habitat dropped below a threshold of 20% at the landscape scale. Here, using the same highly fragmented landscape, we studied the impact of habitat configuration and matrix quality on genetic variation and population differentiation of P. griseoaptera at a small spatial scale. We investigated four clusters of three populations that were either disconnected or connected and had either low quality (arable land) or high quality (grassland) matrix. The number of alleles was significantly lower in disconnected than in connected clusters, irrespective of matrix quality. Genetic differentiation was equally high in the two disconnected clusters and in the connected cluster with low quality matrix (G $_{ST}$ ≥ 0.030; D ≥ 0.082), whereas it was significantly reduced when connected habitats were embedded in a high quality grassland matrix (G $_{ST}$ = 0.004; D = 0.011). Analyses of least-cost paths showed that grassy landscape elements in fact represent high quality matrix, but that linear grassy margins are costly for dispersal. The effect of habitat configuration on genetic diversity may be explained by lower effective population sizes in disconnected habitats. The fact that only the connected populations in high quality matrix were not differentiated indicates that landscape management should simultaneously consider habitat configuration and matrix quality to effectively promote small and dispersal-limited species, also at small spatial scales.
Starting Page	381
Ending Page	392
Page Count	12
File Format	PDF
ISSN	09212973
Journal	Landscape Ecology
Volume Number	27
Issue Number	3
e-ISSN	15729761
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-12-14
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Agricultural landscapes Dispersal Landscape genetics Gene flow Pholidoptera griseoaptera Population genetic structure Forestry Ecology Plant Ecology Plant Sciences Forestry Management Landscape Ecology
Content Type	Text
Resource Type	Article
Subject	Geography, Planning and Development Ecology Nature and Landscape Conservation

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