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 up to date quantity contains descriptions of mountain move 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 info for An illustrated guide to the mountain stream insects of Colorado
Species poorly adapted to resist current tend to reside in weed beds or along the edges of streams, where current velocity is reduced. Page 32 Impacts of Humans on Mountain Streams A stream is an integral component of the watershed through which it flows (Hynes 1975). The stream environment reflects the geochemical and meteorological conditions, the prevailing terrestrial vegetation, and other characteristics of the watershed. Any major alterations of watershed characteristics, whether natural or induced by humans, have an influence on the stream environment.
Page 5 Mountain Stream Ecosystems A variety of lotic (running water) habitats occurs in the mountainous regions of Colorado. Unless otherwise specified, the term ''mountain stream" is used broadly to include any lotic system in the western half of Colorado, irrespective of size or elevation. , brook or river) are described later in this section. However, there is an emphasis on the insect fauna characterizing relatively high-gradient rocky-bottomed stream reaches. The remainder of this section briefly summarizes some of the attributes of mountain stream ecosystems.
Because the number of intolerant species is multiplied by two, the index value is highest in clean waters as follows: BBI = 0 gross organic pollution BBI = 1 to 6 moderate pollution Page 34 BBI = 4 to 9 clean water with moderate or slow current BBI = 10 to 40 clean water with rapid current Community Structure The structure of a biotic community may be described in a variety of ways. The percentage composition of functional feeding groups in the community (see Fig. 10) has already been addressed.