Page 149 - Freshwater-Biology-and-Ecology-Handbook
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The following example explains why this is so. Figure 3.7 shows two streams
providing very different natural habitats but of broadly similar environmental
quality in terms of human impact.
Good quality
mountain stream
WHPT ASPT 7.14
WHPT NTaxa 21.4
Good quality
chalk stream
WHPT ASPT 4.17
WHPT NTaxa 41.7
Figure 3.7
Two different streams of similar environmental quality but supporting very
different invertebrate faunas, resulting in different values of biotic indices
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