. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. slow fast FLOW. —I—- slow FLOW fast FIGURE I. Mean number of (S), (M), and (L) micron particles captured per feeding zooid per colony (±2 SE) by Biigula ncrilina (A) and B stolonifera (B) in slow and fast flow. Two-way analysis of variance for B. neritina: F, 55 (velocity term) = , P = ; (particle size term) = , P < ; F2 55 (velocity X particle size interaction) = , P = Two-way analysis of variance for B. stolonifera: F, 59 (velocity term) = , P = ; (pa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. slow fast FLOW. —I—- slow FLOW fast FIGURE I. Mean number of (S), (M), and (L) micron particles captured per feeding zooid per colony (±2 SE) by Biigula ncrilina (A) and B stolonifera (B) in slow and fast flow. Two-way analysis of variance for B. neritina: F, 55 (velocity term) = , P = ; (particle size term) = , P < ; F2 55 (velocity X particle size interaction) = , P = Two-way analysis of variance for B. stolonifera: F, 59 (velocity term) = , P = ; (particle size term) = , P < ; F.,59 (velocity X particle size interaction) = , P < phorates, and hence that momentum does not play a role in the suspension feeding of these organisms. However, the role of momentum in the transport of particles out of local currents and into feeding currents is unknown. Alternatively, the relatively greater drag experienced by large-sized particles may act to sweep them further down- stream before crossing flow lines in velocity gradients. Both momentum and drag increase with ambient flow velocity. The larger lophophores of Bugula neritina create stronger feeding currents, and these may account for its greater effectiveness in capturing large particles from slow flow. For B. stolonifera, highest ingestion rates in slow flow were on medium-sized particles. In fast flow, B. neritina was hindered in feeding on large particles and showed highest ingestion rates on intermediate-sized particles. The greater momen- tum of or drag on large particles in faster flow may make their ingestion more difficult. However, anomalously high feeding rates on large particles in fast flow were observed for B. stolonifera. The most likely explanation for this is a switch in feeding from mainly ciliary currents to feeding that involves a high degree of tentacular activity. Unfortunately, a switch in feeding technique was not anticipated
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
