Download An illustrated guide to the mountain stream insects of by J. V. Ward, Boris C. Kondratieff, R. E. Zuellig PDF

By J. V. Ward, Boris C. Kondratieff, R. E. Zuellig

This can be a complete source at the biology, ecology, and systematics of aquatic bugs of Rocky Mountain streams. This richly illustrated and updated quantity contains descriptions of mountain circulation ecosystems and habitats; simplified id keys to the bugs of Colorado Mountain streams; transparent, well-labelled drawings; and an in depth bibliography. Species' distributions by way of drainage basin are supplied for mayflies, stoneflies and caddisflies, the 3 orders for which such info can be found.

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Extra resources for An illustrated guide to the mountain stream insects of Colorado

Example text

Lamberti and Resh 1983), virtually no data are available on aquatic insects of the thermal waters in Colorado. Page 15 Controlling Factors A myriad of environmental factors and their interactions determine the composition and abundance of stream insects. However, in natural streams relatively few major controlling factors account for the environmental variance of primary importance in structuring lotic communities. The remainder of this section addresses these major controlling factors. For additional reading on this topic see Macan (1961, 1974), Hynes (1970a, 1970b), Resh and Rosenberg (1984), and Ward (1992).

Current velocity decreases from the water surface to the streambed and is generally lower near the banks than in the center of the stream. Stream insects may partition the habitat according to current preferenda, with species well adapted to current residing primarily in the center of the stream and species poorly adapted to current being restricted to the edges (Needham and Usinger 1956). The microcurrent regime near the streambed is of interest because it is the habitat of most Page 18 lotic insects.

They provide some information on water quality, even at a fairly coarse level of taxonomic resolution. In addition, the life cycles of aquatic insects are generally of a duration to provide maximum information on environmental conditions. , aquatic insects) in assessing stream conditions, but to be aware of the limitations of the various parameters sampled. Biological indicators of water quality include toxicity tests and behavioral observations of live organisms in the laboratory as well as analyses of cells and tissues (Wilhm 1975).

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