03363naa a2200253 a 450000100080000000500110000800800410001910000130006024500850007326000090015852024410016770000170260870000140262570000200263970000170265970000160267670000160269270000170270870000150272570000170274070000150275770000160277277303210278813148292008-09-16       2008    bl uuuu     u00u1 u    #d1 aDUBS, F.  aSurrounding landscape effects on local community of soil macrofauna detritivore.  c2008  aWhile habitat quality is known to influence species occurrence at a focal site, local diversity within habitat patches also depends on the structure of the surrounding landscape and the associated constraints on species dispersion. Thus, it is quite obvious that habitat constraints are not enough to explain variability in local species composition between patches with different land uses, and that we need to consider landscape context to improve the power of explanatory environmental factors. In this study, we assessed the importance of ?neighbouring or matrix effect? on the structure of soil fauna detritivore communities (diplopods, isopods and earthworms) from a data set collected in 5 landscape 1 km2 windows replicated in 2 regions in France and representing a gradient of 5 levels of landscape intensification. In each window, we identified 16 points regularly distributed 200m apart from each other as follow and, on each of them, was sampled fauna with a combination of hand sorting and formaldehyde extraction on 3 replicates of 25 ? 25 cm. Invertebrates were identified to species and counted. We used canonical correspondence analysis and partial canonical ordination to assess the respective impact of surrounding landscape vs. habitat constraints. Hypothetical driving factors were categorised as follows: habitat quality by soil, habitat and management types and surrounding landscape by composition and configuration of habitat around the sampling point. We found that the surrounding landscape composition (proportion and diversity of different habitat types) and configuration (shape and dispersion of habitats) had significant effects on the structure of soil macrofauna detritivore communities with different local communities in 1) forested surrounding landscape, 2) heterogeneous surrounding landscape, 3) grassland surrounding landscape and 4) crop surrounding landscape. Habitat quality also dramatically influenced the diversity and abundance of detritivore macroinvertebrates. Significant differences were found between: 1) habitat with mowing, organic, permanent grassland, 2) habitat with changing land uses, fertilised crops and grazing pastures, and 3) managed forest habitats. The variance partitioning between the three sets of environmental variables showed that habitat quality factors were the most influencing, followed by surrounding landscape composition and surrounding landscape structure.1 aDECAËNS, T.1 aHEDDE, M.1 aGEOFFROY, J. J.1 aBOUTH, M. le1 aGARNIER, A.1 aBOGUCKI, C.1 aLANGLOIS, E.1 aBUREAU, F.1 aMARGERIE, P.1 aAUBERT, M.1 aLAVELLE, P.  tIn: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.