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Short-range structures in earthworm spatial distribution:The 7th international symposium on earthworm ecology · Cardiff · Wales · 2002

Authors
Journal
Pedobiologia
0031-4056
Publisher
Elsevier
Publication Date
Volume
47
Identifiers
DOI: 10.1078/0031-4056-00233
Keywords
  • Earthworm
  • Spatial Distribution
  • Short-Scale
  • Patch
  • Gap
Disciplines
  • Design

Abstract

Summary Populations of soil organisms and especially earthworms are spatially dependent at various scales. The present study was designed to assess the short-range spatial variability of different tropical earthworm populations in a savanna protected from fire for 15 years in the station d'Écologie Tropicale of Lamto (Côte d'Ivoire). Earthworms were sampled in 1995 and 1996 using 75 and 98 25×25×10 cm soil monoliths respectively. Sampling points were distributed along a transect with minimum inter-sample distance of 50 cm. The earthworms displayed clear spatial structures either when density or biomass were analysed. Some variograms displayed two plateaux thus indicating the presence of two distinct scales of spatial autocorrelation. However small the minimum sample spacing, the nugget variance remained high, which indicated the high value of residual, small-scale variability. SADIE analyses were used to test for statistical significance of the spatial aggregation and clusters description.

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