Abstract
A water mite, Piona exigua, is the dominant invertebrate predator in some New Zealand lakes. To establish the extent to which this predator has an impact on the populations of its prey species, we have analysed the effect of prey availability on quantitative estimates of predation. We describe Piona functional responses generated under a range of conditions and compare them using «parallel curve analysis» and a maximum likelihood method of estimating curve parameters
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