Abstract
Epiphytic bacteria were compared with planktonic bacteria in two watercourses enriched with sewage works effluent. Colony‐forming units as a percentage of acridine orange direct counts were higher for epiphytic bacteria in one watercourse. The percentage of cells capable of intracellular reduction of 2‐(p‐iodophenyl)‐3‐(p‐nitrophenyl)‐5‐phenyl tetrazolium chloride (INT) to INT‐formazan was higher for epiphytic bacteria in both watercourses. The greater viability of epiphytic over planktonic bacteria was less evident, however, than in previously studied non‐enriched gravel pit ponds. This suggests that the greater availability of dissolved organic nutrients in the enriched watercourses reduced stress on planktonic bacteria.
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