. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FLOW AND SUSPENSION-FEEDER GROWTH 37 Pollicipes polymerus *Z- 5- E 0) I I O 3- 10 12 14 16 Speed (cms-1) Figure 9. Growth rates of Pollicipes polymerus as a function of flow speed during the 69-day deployment in 1992. Other interpretations as in Figure 4. There was no significant best-fit regression. at higher speeds (Fig. 10). Polynomial regression indicates that this convex-upward trend was weak and not signifi- cant at the conventional level of P = (r = , P = ). However, further evidence of a speed-depen- den
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FLOW AND SUSPENSION-FEEDER GROWTH 37 Pollicipes polymerus *Z- 5- E 0) I I O 3- 10 12 14 16 Speed (cms-1) Figure 9. Growth rates of Pollicipes polymerus as a function of flow speed during the 69-day deployment in 1992. Other interpretations as in Figure 4. There was no significant best-fit regression. at higher speeds (Fig. 10). Polynomial regression indicates that this convex-upward trend was weak and not signifi- cant at the conventional level of P = (r = , P = ). However, further evidence of a speed-depen- dent growth response is supported by results of ANOVA. which indicated that replicate pipe effects were not sig- nificant ( = , P = ), but that effects of flow level on growth were highly significant (F4t>5 = , P = ). A posteriori multiple comparison tests (T- method—Sokal and Rohlf, 1981. p. 246) indicated that growth rates at U = 8 cm s~' significantly exceeded those at U = and cm s ' (a = ). Friday Harbor Laboratories can be quite strong (Eckman et 1989), this species also thrives in areas of compar- atively weak flow energy. Animals used in this study were collected from a quiescent environment where even free- stream flows typically are <10 cm s ' (personal obser- vations). In contrast to the balanoid barnacles, the pedunculate barnacle Pollicipes polymerus never swept the cirral net through the water. This species curled the cirrus inward when exposed to stronger flows (a behavior and not a passive deflection of the cirrus by flow) and retracted the cirrus completely at the highest speeds examined. This dissimilarity from the balanoid barnacles held despite the fact that P. polymerus lives sympatrically with S. cariosus in comparatively high-energy intertidal regions. The bryozoan Membranipora membranacea was able to extend and use the lophophore at flow speeds re cc 200- 150- 100 -I 50-. 10 16 Speed (ems'1) Figure 10. Growth r
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