. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. tain up to ± of the nauplii passing the pro- jected area of the tentacle crown at their optimal flow speed ({7]0 = 20 cm s~'). The feeding efficiency of all size classes decreased monotonically beyond their optimum. At all flow velocities except the lowest one, small anem- ones were significantly (2-3 times) more efficient than medium-sized anemones, which in turn were about twice as efficient as large anemones; these results are analogous to the pattern of feeding rates based on bio- mass and area of feeding surfa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. tain up to ± of the nauplii passing the pro- jected area of the tentacle crown at their optimal flow speed ({7]0 = 20 cm s~'). The feeding efficiency of all size classes decreased monotonically beyond their optimum. At all flow velocities except the lowest one, small anem- ones were significantly (2-3 times) more efficient than medium-sized anemones, which in turn were about twice as efficient as large anemones; these results are analogous to the pattern of feeding rates based on bio- mass and area of feeding surface. Effect of upstream neighbors The feeding rate per unit area of tentacle crown of me- dium-sized M. senile declined significantly with increas- ing numbers of conspecifics upstream ( ± to ± nauplii min~' cm"2, both ±95% CL) (Fig. 5). The effect of upstream neighbors was most pronounced within small aggregations of anemones (2-4 rows). In- creasing the number of aligned rows of anemones from 7 to 16 did not reduce the feeding rate per unit area of tentacle crown, and thus indicated a threshold at which the feeding rate per polyp was unaffected by the addition of upstream neighbors. 30 J 24 U 1. 18 i if 12 •8 u 10 20 30 Flow regime (U,0, cm s" ) 40 Figured. Feeding rates (nauplii min~') per (A) polyp. (B) gram of ash-free dry weight, and (C) unit area of tentacle crown of Meindium senile as a function of body size and flow regime. Error bars are ±95% confidence limits. All comparisons among size classes are significant at any given flow regime except at l'M) = 4 cm s~'. Groups with overlap- ping error bars are not significantly different by the Tukey-Kramer test. Regressions for the determination of F were highly significant in all experiments (P ). which the feeding efficiency (E) was maximized (Fig. 4). Large anemones showed a maximum feeding efficiency at the slowest flow (L'\(> = 4 cms"1), medium-sized anemones at low to
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
