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Progress in Physical Geography
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Reviewing the impact of metals and PAHs on macroinvertebrates in urban watercourses

Gary Beasley

School of Geography, University of Leeds, Leeds LS2 9JT, UK

Pauline Kneale

School of Geography, University of Leeds, Leeds LS2 9JT, UK, p.e.kneale{at}leeds.ac.uk

Pollution-free stream water and sediments are crucial to support healthy stream flora and fauna, but urban surface runoff impairs water quality and leaves a legacy of pollution in the sediments. Pollution in sediments influences the development of macroinvertebrates, the lowest members of the food chain, leading to modification of the whole ecological structure. This review focuses on the sources and impacts of zinc, nickel, copper and oil derivative polycyclic aromatic hydrocarbon (PAH) contaminants on macroinvertebrates in urban streams. Land use, and the connectivity of the runoff and sediment are seen to have an effect on the ecological integrity of the watercourse but case examples are sparse. The literature indicates that while reduced species diversity has been identified at a number of sites the dynamics are neither well understood nor well modelled. The literature evidence is compared with field evidence from a study of 62 source areas in headwater catchments with residential, urban, industrial and motorway land uses. From the review and field results it is evident that there is still an important need for process-based field measurements of urban water quality parameters. It is suggested that forecasting the ecological status of watercourses would benefit from data on sediment chemistry and the interaction effects of metals and PAHs.

Key Words: copper • ecology • hydrology • macroinvertebrates • nickel • PAHs • urban runoff • zinc

Progress in Physical Geography, Vol. 26, No. 2, 236-270 (2002)
DOI: 10.1191/0309133302pp334ra
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