. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PASSIVE SUSPENSION FEEDING 337 io E I io2 O) _5 £ io1 Large 0 2 4 6 8 10 12 14 16 18 2022 24 Ambient Velocity (cm/s) Figure 3. Volume flow rate as a function ot ambient velocity. The volume of water passing through the rachis initially increases as velocity rises, then peaks and declines due to the postural change of a sea pen. tip. Eleven to twelve pairs of pinnules project out along the length of the tentacle, increasing from a length of mm at the tentacle base to mm at the tentacle tip. These pinnules do not pro
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PASSIVE SUSPENSION FEEDING 337 io E I io2 O) _5 £ io1 Large 0 2 4 6 8 10 12 14 16 18 2022 24 Ambient Velocity (cm/s) Figure 3. Volume flow rate as a function ot ambient velocity. The volume of water passing through the rachis initially increases as velocity rises, then peaks and declines due to the postural change of a sea pen. tip. Eleven to twelve pairs of pinnules project out along the length of the tentacle, increasing from a length of mm at the tentacle base to mm at the tentacle tip. These pinnules do not project laterally out from the tentacle, but are angled downstream. Pinnule width ranged from to mm. Spacing between pinnules ranged from to mm. The spacing between the leaves, on the downstream side of the animal, was smaller in the small sea pens ( mm mean spacing. range, n = 6 organisms) than in the large sea pens ( mm mean. range, n = 7) in still water. With increasing flow speeds both small and large sea pens flex with the flow, resulting in a decreased spacing between leaves. At 13 cm s~', small sea pens had a mean spacing of mm, range : large sea pens had a mean spacing of mm, range At 20 cm s~', large sea pens had a mean of mm. range In still water polyp density, in the plane of the filter, is ± polyps cm : (n = 12) in large sea pens and ± polyps cm~: (n = 12) in small sea pens. As ambient flow speed increases to 13 cm s~', polyp density does not change significantly in small sea pens. However, in large sea pens there is a significant increase in polyp density to ± polyps cm~: (Student's /-test, / = , « = n = 24). I 'olumeflow rates The volume of water flowing through the filter per unit time (volume flow rate) is dependent on both the ambi- ent flow speed and the area of filter projected into the flow as determined by the posture of the organism (Best
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
