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Benthic Invertebrates of an Earthen Canal in the Phoenix Metropolitan Area, Arizona

Paul C. Marsh
Journal of the Arizona-Nevada Academy of Science
Vol. 18, No. 1 (1983), pp. 1-3
Stable URL: http://www.jstor.org/stable/40026521
Page Count: 3
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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.
Benthic Invertebrates of an Earthen Canal in the Phoenix Metropolitan Area, Arizona
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Abstract

The macroinvertebrate fauna of a small, earthen canal in the Phoenix metropolitan area, Arizona, was sampled over a 13-month period from November 1981 through November 1982. Mean monthly standing stock of 14, 802 organisms/m² was predominated by Oligochaeta (10,922/m²) and Corbicula fluminea (2,777/m²). Chironomidae and Callibaetis sp., and seven other insect taxa collectively comprised less than 5.5% of the fauna. Seasonal patterns of abundance and mean individual sizes indicated peak recruitment of Oligochaeta and C. fluminea in late winter, and of Chironomidae and Callibaetis sp. in late autumn. The fauna of this small canal was generally similar in species composition to that of the larger Coachella Canal in southeastern California, but both have dramatically reduced species richness as compared with natural low-elevation watercourses of Arizona. The invertebrate fauna may be forage for canal fishes.

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