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 comprises descriptions of mountain movement 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 information can be found.

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

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Certain baetid mayflies (Fig. 47) are good examples of stream insects that are able to colonize the upper surfaces of rocks in rapid water because of their streamlined bodies. Other mayflies living in slower currents or lentic waters may also be streamlined (Fig. 50); however, the streamlining in these cases serves to reduce resistance when swimming. Another adaptation enabling insects to reside on the tops of rocks in rapid water is the possession of suckers or friction pads. Net-winged midges (Blephariceridae) possess hydraulic suckers on the ventral body surface (Fig.

The taxonomy of many groups remains to be fully elucidated. Species identification keys for immatures are either unavailable or inadequate for some groups of aquatic insects in this region. Knowledge of distribution patterns within Colorado is also incomplete; only very limited data are available for several major drainage basins. That the distribution of many species is much broader than records indicate becomes readily apparent when collecting in little-studied areas of Colorado. There is also a great need for carefully conducted ecological studies, including analyses of food habits, life history phenomena, and predator-prey interactions.

Several indices have been developed to measure species diversity. The Shannon-Weaver index (Shannon and Weaver 1963) has commonly been used to measure diversity in stream macroinvertebrates. The Shannon-Weaver index (abbreviated d) is predicated upon assumptions that (1) the sample collected is a random sample from an infinitely large population and (2) all species present in the community are represented in the sample. Because both of these assumptions are rarely met, the diversity index should be used with caution and in conjunction with other biotic and abiotic data.

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