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Figure 1:
Polypropylene experimental arenas to assess introduction at a common point. Arenas filled with approximately 1200 g of sand at 10% moisture. Image shows introduction point on 60mm filter paper and sample locations.
Figure 2:
Pyrex experimental arenas to assess responses when nematodes were added to opposite corners. Arenas filled with approximately 1200 g of sand at 10% moisture. A: Heterospecific experiment arena, where corners have different species of IJs. B: Conspecific test arena, where a single species of IJ was placed at one corner. C: 5 × 5 sampling grid; samples were collected at each circle.
Figure 3:
Index of Dispersion for each of the three species when applied alone in the center of dispersal boxes. Values of D > 1 indicate increasing aggregation. Solid line within each box indicates the median, black diamonds indicate the arithmetic mean, and black circles indicate outliers (observations with values > 1.5 * the interquartile range).
Figure 4:
Aggregation shown by each of the three species when center placed, in both conspecific (alone) and heterospecific conditions. Increasing values of D indicate increasing aggregation. Sc = Steinernema carpocapsae, Sf = Steinernema feltiae, Sg = Steinernema glaseri. The solid line within each box indicates the median, black diamonds indicate the arithmetic mean, and black circles indicate outliers (observations with values > 1.5 * the interquartile range). NOTE that y-axis scale changes significantly across the three panels.
Figure 5:
Aggregation shown by each of the 3 species when corner placed, in both conspecific and heterospecific conditions. Increasing values of D indicate increasing aggregation. Sc = Steinernema carpocapsae, Sf = Steinernema feltiae, Sg = Steinernema glaseri. The solid line within each box indicates the median, black diamonds indicate the arithmetic mean, and black circles indicate outliers (observations with values > 1.5 * the interquartile range).
Figure 6:
Average IJ movement in each of the 3 species when corner placed, in both conspecific and heterospecific conditions. Sc = Steinernema carpocapsae, Sf = Steinernema feltiae, Sg = Steinernema glaseri. The solid line within each box indicates the median, black diamonds indicate the arithmetic mean, and black circles indicate outliers (observations with values > 1.5 * the interquartile range).