Abstract
Negative relations between abundance of the predatory polychaete Nephtys hombergii and values for biornass and rate of increase in 2 of its prey species, the polychaetes Scoloplos armiger and Heteromastusfiliformis, are evident in long-term (18 yr) data from tidal flats in the westernmost part of the Wadden Sea. Values for prey biornass tended to decline at high N. hombergii biomass (above ca 0.3 g m-' AFDW), whereas they tended to increase at lower levels of N. hombergii biomass. These results corroborate Schubert & Reise's (Mar. Ecol. Prog. Ser. 34: 117-124, 1986) conclusion, based on short-term enclosure experiments, that N. hornbergl~ is an important infaunal predator in the Wadden Sea.
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