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Oikopleura vanhoeffeni inhabibng cold coastal Newfoundland waters are much larger than the extensively studied warm water species, 0. dioica; nevertheless they possess fine-meshed feeding filters capable of retaining the nanoplankton that dominate the water column throughout much of the year. Total clearance rates were determined using radioactively labelled algae presented to ~ndividuals in feeding chambers in situ over a seasonal range of ambient water temperatures and food concentrations. Stepwise multiple regression analysis indicated that oikopleurid size explained 46 % of the variance in clearance rate. An additional 10 O/o of the variation was explained by the ambient b~omass concentrations of chain-forming diatoms and of picoplankton (< 2 pm In d~amete r ) , consistent with a filter-clogging interpretation. Water temperature was not a sign~flcant vanable in the regression model and its coefficient was negative, indicating that clearing rates were highest at the near 0 "C temperatures characteristic of the spring bloom, a period when bacterial activity is suppressed. Water column clearing rates attributable to Oikopleura populations were comparable to those calculated for the copepod commun~ty based on published data. The large size and c o ~ ~ s p ~ c u o u s pigmentation of 0. vanhoeffenj should make them particularly susceptible to visually feeding planktivores and they may thus constitute an important link in the food chain supporting a large commercial fishery. p-p -MARINE ECOLOGY PROGRESS SERIES Mar. Ecol. Prog. Ser. INTRODUCTION mucous house Members of the family Oikopleuridae feed within a roughly spherical mucous 'house' (Lohmann 1899) containing 2 sets of filters (Fig. 1). Sinusoidal movement of the oikopleurid's muscular tail draws water into the house through the coarse incurrent filters that exclude large particles, and then pumps the water through finer feeding filters where sieving action results in a concentrated food suspension. This suspension is then further concentrated by a mucous pharyngeal net which conveys food particles into the mouth (Deibel 1986). These animals are able to concentrate plankton too small for efficient consumption by setose-appendage feeding copepods and may constitute a key pathway of energy flow from nano and picoplankton to higher trophic levels. The phytoplankton biomass of cold coastal Newfoundland waters is dominated by small nanoincurrent filters

Clearance rates of Oikopleura in cold coastal Newfoundland waters: a predictive model and its trophodynamic implications