Abstract
Quantitative sampling using a hand-net can be accomplished by taking three
successive catches of invertebrates from the same point on the streambed. This
is a form of removal sampling. By plotting the decline in number of
individuals in each catch against the total previously caught, the total
population at the sampling point can be estimated. From this, the probability
of capture in a single catch (p) can be calculated. For
Agapetus, other trichopteran, leptophlebiid, caenid and
gripopterygid larvae from a site on a tributary of the Acheron River in
southern Australia, p varied from 0.66 to 0.81.
Additional data for a species of Gammarus from the
Credit River in Ontario gave a p value of 0.67. In three
successive catches the overall probability of capture exceeded 95% for
all taxa, indicating that with this degree of effort most individuals present
were caught.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
6 articles.
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