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- W2418616206 abstract "Many investigators of polluted streams have collected samples of ben thic macroinvertebrates. Bottom or ganisms are particularly suitable for such studies because their habitat pref erence and low motility cause them to be directly affected by substances that enter the environment (1). Associa tions or populations of benthic macro invertebrates provide a more reliable criterion of organic enrichment than mere occurrence of a given species (2). This statement is based on the assump tion that actions of the abiotic environ ment and coactions between the biotic components result in a characteristic assemblage of organisms. This com plex of individuals belonging to the different species can be referred to as community diversity. Typically, in unpolluted communities relatively few species are common and many species are rare (3). Although many investigators have sampled the same types of organisms, comparisons among different studies are usually difficult because of the wide variety of graphic and mathematical methods of summarizing the data. Graphic methods have included pie, bar, and line graphs. Graphic analyses are usually more difficult to prepare and usually make spatial and temporal com parisons difficult. Some investigators have listed the species collected and their abundance, while others have used the terms rare, common, and abundant to describe their relative abundance. These relative terms often apply to different ranges in different" @default.
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- W2418616206 date "1970-05-01" @default.
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- W2418616206 title "Range of diversity index in benthic macroinvertebrate populations." @default.
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