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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/774

Title: The recolonization mechanisms of stream benthos
Authors: Williams, Dudley
Hynes, H.B.N.
Issue Date: 1967
Publisher: Oikos
Citation: Oikos 27: 265-272. Copenhagen 1976
Abstract: The animals recolonizing an area of denuded stream substrate are thought to come from four main sources. These are drift, upstream migration within the water, migration from within the substrate, and aerial sources, e.g., oviposition. An experiment in a Canadian stream showed drift to be the most important source of recolonizing animals, contributing 41.4% of the total number that settled on an area of 1800 cm2. This compares with 28.2 % from aerial sources while upstream migration and movement up from within the substrate contributed about equally (18.2% and 19.1 %, respectively). Clearly then, all four directions are important in repopulating bare areas. Further, many groups of organisms were found to have preferred directions from which they recolonize and this, it is argued, may lead to the establishment of separate and distinct faunal assemblages if the other directions are excluded.
URI: http://hdl.handle.net/1807/774
Appears in Collections:Biology

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