. Le bulletin biologique. Biologie ; zoologie ; biologie ; biologie marine. Au niveau de la capture de proies POLYPE EVENTS 97 Umoyenne  = 2-7 cm/s LI 60 • • 1 40 50 ' 30 ' u 01 ft, 20 • 10 ' n  = 207  = =£±1 1 1 1 1 moyenne  = 12,2 cm/s 60 n  = 20550 • T *- 40 | 30" un* ft. 20 ' 10 ' 1 0 1  = 19'880 • 70 ' 60 ' 50 ' 01 £ £ £ 30 40 ' 20 ' 10 ' * n  = 70 1 1 0 ' 0.0 0,2 0,4 0,6 0,8 1,0 0,0 0,2 0,4 0,6 0,8 1,0 0,0 0,2 0,4 0,6 0,8 1,0 Le pharynx &gt ; l'extrémité des tentacules (X/L) Figure 2. Emplacement des événements de capture des proies le long de la longueur de tentacules de polypes dans l'octocoral Alcyonium à trois vitesses différentes. Voir la figure IV pour l'inte

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POLYP-LEVEL PREY CAPTURE EVENTS 97 Umean = 2-7 cm/s LI 60 • 50 ' 40 • 1 30 ' u 01 ft, 20 • 10 ' n = 207 ==£±1 1 I 1 1 mean = 12.2cm/s 60 n = 205 50 • T *- 40 | 30" a* ft. 20 ' 10 ' 1 0 1 = 19'8 80 • 70 ' 60 ' £ 50 ' 01 £ 40 ' £ 30 * 20 ' 10 ' n = 70 1 1 0 ' 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.2 0.4 0.6 0.8 1.0 Pharynx > Tentacle Tip (X/L) Figure 2. Location of prey capture events along the length of tentacles of polyps in the octocoral Alcyonium at three different flow speeds. See Figure IA for interpretation of abscissa. Capture frequencies are normali/ed relative to the amount of tentacle area available for prey capture. Data were arc-sine transformed and then back-transformed for graphical portrayal. Vertical bars are 95"i confidence intervals. For flow speeds of 2.7, 12.2, and 19.8 cm/s, the total numbers of cysts caught were 207, 205, and 70, respectively. verse relationship between flow speed at the surface of the filter and efficiency of particle capture and is here observed in Alcyonium (Fig. 3). Rubenstein and Koehl (1977) originally predicted that direct interception would be the dominant mode of feeding in aquatic suspension feeders and subsequent work with a diversity of organisms seems to be bearing out their hypothesis (LaBarbera, 1984). Alcyonium could sieve particles larger than the spacing between pinnules on the tentacles (200-280 /urn) as sug- gested by Sebens and Koehl (1984). However, Anemia cysts sieved on the aboral side of a tentacle were almost always dislodged subsequently by the flow and lost to the polyp (pers. obs.). Anemia cysts were occasionally sieved by tentacles on the downstream side of the polyp. For larger prey items, sieving may be an important capture mechanism, but probably only for tentacles on the down- stream side of a polyp. The parameter for diffusive deposition assumes the particle has a diffusion coefficie

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• bookauthorlilliefrankrat
• booksubjectbiology
• booksubjectzoology