FIGURE 10.5 The proportion of sampling occasions that included each taxon over 24 years of study in the Broad-stone Stream, United Kingdom. Numbers along the lower axis refer to individual species. The core community consisted of eight taxa that were always present. These included: 1, Nemurella pictetii; 2, Leuctra nigra; 3, Plectrocnemia conspersa; 4, Sialis fuliginosa; 5, Pentaneurini; 6, Ceratopogonidae; 7, Heterotrissocladius marcidus/Brillia modesta; 8, Polypedilum abicorne. The pH optima for individual taxa are indicated where known. (Reproduced from Woodward et al. 2002.)

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