. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 48 T. HUNTER tales suspension feeding (Wainwright et ai. 1976; Harvell and LaBarbera, 1986). Evaluation of these hypotheses will require actual visualization of particle capture. Flow velocity and feeding Feeding effectiveness is higher in oscillating than in uni-directional flow at the same average velocity. Yet, the peak velocity in oscillating How is higher than in uni- directional flow ( m/s' m/s, respectively) and the difference in feeding may simply be due to this difference in peak velocities. Simply in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 48 T. HUNTER tales suspension feeding (Wainwright et ai. 1976; Harvell and LaBarbera, 1986). Evaluation of these hypotheses will require actual visualization of particle capture. Flow velocity and feeding Feeding effectiveness is higher in oscillating than in uni-directional flow at the same average velocity. Yet, the peak velocity in oscillating How is higher than in uni- directional flow ( m/s' m/s, respectively) and the difference in feeding may simply be due to this difference in peak velocities. Simply increasing flow ve- locity (from m/s to m/s) in uni-directional flow at constant particle concentration increases polyp and colony feeding effectiveness (Fig. 6). This is due to an increase in particle availability (flux past the colony). If particle flux is held constant, this increase in feeding with increasing flow velocity disappears (Fig. 6). By measuring feeding both at constant flux and at con- stant particle concentration, it is possible to separate effects due to particle availability from effects due to flow velocity per se. Most studies have analyzed the effect of velocity on feeding without separating these two con- founding effects (eg., Leversee, 1976; LaBarbera, 1981; Okamura, 1984). Colony morphology Increases in colony bushiness (colony weight/colony length) result in a small but significant decrease in both polyp feeding effectiveness (Fig. 4) and colony feeding effectiveness (Fig. 5). As colony bushiness increases, more gastrozooids (mouths) occupy the same volume. Thus, if the volume is well mixed, feeding effectiveness should increase. However, if the volume is not well mixed, and colony feeding results in a local particle de- pletion, then feeding effectiveness should decrease be- cause of the lack of particles available for consumption. Increased local mixing, by stirring more particles into this depleted volume of water, would tend to restore t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
