Figure 1From: Long-term resource variation and group size: A large-sample field test of the Resource Dispersion HypothesisComparison of indices of earthworm abundance in three major habitat types in 1978 and 1999. Data from the two years are on different axes because of differences in methodology. 1974 (L) is for Lumbricus terrestris only, 1974 (A) denotes all earthworm species. In 1999 figures are for all species. Error bars show +/- 1 standard error.Back to article page