Abstract
Abstract Environmental data and aquatic macroinvertebrates colonising macrophytes or stones were collected at 29 stream and river sites in Northland, New Zealand, in February 1994 to elucidate environmental factors influencing the taxonomic composition of invertebrate communities. The 84 taxa recorded in February comprised predominantly Trichoptera (24 taxa), Ephe‐meroptera (17), and Diptera (14). Substrate type (macrophytes or stones) and percentage of native forest up stream or in the riparian zone appeared to be factors affecting classification of sites in TWINSPAN. Although catchment land use or riparian vegetation were not implicated as major factors affecting taxonomic richness or overall community composition (as indicated by DECORANA) at stony sites, the number of mayfly, stonefly, and caddisfly taxa was significantly correlated with the proportion of native forest cover in the riparian zone. Overall taxonomic richness and community composition appeared to be affected by small‐ to medium‐scale fac...
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