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- Title
Relating species density to environmental variables in presence of spatial autocorrelation: a study case on soil nematodes distribution
- Authors
Rossi, J.-P.; Queneherve, P.
- Abstract
The relationships between soil nematodes and soil texture, carbon content and depth were assessed in both a cultivated and an uncultivated plots. Simple correlation coefficients analyses indicated a negative linear correlation between the plant-parasitic species Helicotylenchus retusus Siddiqui and Brown and soil clay content in the uncultivated site. However, Mantel tests showed this correlation to be spurious and only due to the presence of a common spatial pattern in the variables distribution. Both Helicotylenchus retusus density and soil clay content appeared to be independently driven by a common, unknown cause. The use of suitable statistical methods to analyse spatially dependent variables proved to be particularly fruitful in that they prevent from spurious correlations and allow to test different causal models involving the set of variables at hand.
- Subjects
STATISTICS; NEMATODES; SPECIES distribution; SOILS
- Publication
Ecography, 1998, Vol 21, Issue 2, p117
- ISSN
0906-7590
- Publication type
Article
- DOI
10.1111/j.1600-0587.1998.tb00665.x