Abstract
SUMMARY. Estimates of relative and absolute abundance in field populations of two Gerris species were compared using regression techniques. Separate equations for each gerrid size class allow prediction of population density from timed‐catch sampling. Presence or absence of vegetation markedly affected capture rates, but capture rates were not affected by Gerris species or type of emergent vegetation. Availability for capture varied with gerrid leg length; this relationship can be used to estimate availability constants for other water‐strider species.
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