. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 24 G. C. TRACER AND A. GENIN a. •(/) E 8 si > o b- hold left s sweep left 4 fan down 3 fan up 2 clean off 1 c. hold left s 4 fan down 3 fan up 2 clean off 1. 0 10 20 30 40 50 TIME (sec) Figure 4. Behavioral change from active to intermediate to passive suspension feeding induced by linearly accelerated unidirectional water flow, (a) Linear change in flow velocity inducing the behavioral changes depicted graphically in (b) and (c), which show numerically indexed components of cyclical feeding behavior plotted against time.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 24 G. C. TRACER AND A. GENIN a. •(/) E 8 si > o b- hold left s sweep left 4 fan down 3 fan up 2 clean off 1 c. hold left s 4 fan down 3 fan up 2 clean off 1. 0 10 20 30 40 50 TIME (sec) Figure 4. Behavioral change from active to intermediate to passive suspension feeding induced by linearly accelerated unidirectional water flow, (a) Linear change in flow velocity inducing the behavioral changes depicted graphically in (b) and (c), which show numerically indexed components of cyclical feeding behavior plotted against time. Each be- havioral component and its assigned index value is listed on the ordinate, and the occurrence of any component is indicated by a peak or plateau in the curve at the appropriate level. The length of each horizontal portion of the indexed behavior curve indicates the duration (seconds) of a be- havioral component. Steeply inclined rises or drops of the curve show when, from one video frame to the next, a behavioral component has changed. Thus, changes in activity rate (frequency) are indicated by changes in the horizontal distance between curve peaks, and changes in behavioral components are seen as changes in the height of the curve peaks, (b) Indexed behavior time series for the left feeding fan. Active feeding is rapid ( Hz), occurs in slowly moving water, and consists of only 3 components (clean off, fan up, and fan down). The beginning of intermediate behavior, with characteristics of both active and passive feeding, first appears at a velocity of about cm s"', when the behavior curve suddenly jumps up to an index value of 4 (sweep left). The time and velocity at which this new component appears is indicated by (I) on the velocity curve. The activity rate also slows down somewhat during this transition period, with the appearance of the "hold left" component [stationary holding of the fan into the current (index value 5); its first appearan
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
