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Postflood Recolonization Pathways of Macroinvertebrates in a Lowland Sonoran Desert Stream

Lawrence J. Gray and Stuart G. Fisher
The American Midland Naturalist
Vol. 106, No. 2 (Oct., 1981), pp. 249-257
DOI: 10.2307/2425161
Stable URL: http://www.jstor.org/stable/2425161
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Postflood Recolonization Pathways of Macroinvertebrates in a Lowland Sonoran Desert Stream
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Abstract

Most macroinvertebrate taxa recolonizing after floods in Sycamore Creek did so via aerial pathways. After frequent winter flooding, most aerial colonists were aquatic adults (Coleoptera and Hemiptera), whereas ovipositing adults (Ephemeroptera and Diptera) dominated after summer flooding. Drift and upstream movements by relatively few taxa contributed most individuals after floods. Upstream movements were greater during high discharge than during low discharge periods. Few taxa and individuals were present in sediments below 10 cm.

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