. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 424 A. E. SCHIVELL ET AL o> 200 | 1 1 1— —I— — r— — i — I o> ^.u u c 1 I I 1 | 150 I F 'c | 150 1 RST 0 L. i 2! \ J2 100 • J2 100 \ o I o A £ I E V W rt \ 5 50 v o 50 A »*— o =jt n MQlSfemriEinit^ o-u =*= n 0 60 120 180 240 300 360 0 60 1 20 1 80 240 3C time (minutes) time (minutes) 0> ^3VJ C I 200 E * 150 I OH \ _w \ g 100 1 ° 50 A o =«= n h>f^__ , 60 120 time (minutes) 180 250 o 200 E (U — o E 'c D 150 100 50 0. AL 60 120 time (minutes) Figure 6. Dwell-time histograms for feeding (F), open hood (OH), resting (R
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 424 A. E. SCHIVELL ET AL o> 200 | 1 1 1— —I— — r— — i — I o> ^.u u c 1 I I 1 | 150 I F 'c | 150 1 RST 0 L. i 2! \ J2 100 • J2 100 \ o I o A £ I E V W rt \ 5 50 v o 50 A »*— o =jt n MQlSfemriEinit^ o-u =*= n 0 60 120 180 240 300 360 0 60 1 20 1 80 240 3C time (minutes) time (minutes) 0> ^3VJ C I 200 E * 150 I OH \ _w \ g 100 1 ° 50 A o =«= n h>f^__ , 60 120 time (minutes) 180 250 o 200 E (U — o E 'c D 150 100 50 0. AL 60 120 time (minutes) Figure 6. Dwell-time histograms for feeding (F), open hood (OH), resting (RST). and alert-processes extended (AL) behaviors. The OH and A L distributions are lit by exponentials (solid curve), consistent with the exit from these behaviors being random. The feeding (F) dwell-time distribution is also approximately exponential, except for outlying points that account for 1% of the data. The outlying points with long dwell times may reflect behavior driven by external stimulation. Two fits are plotted for the resting (RST) data, a single exponential (solid line) and the sum of two exponentials (dashed line). All distributions were fitted using a nonlinear least-squares method. 180 time in a fashion that is graded with the concentration of prey. A particular pair of behavioral transitions, OH<-»AL, acts as a gateway between the feeding and resting behav- ior modes. The OH and AL behaviors share features of body posture such as the positions of the rhinophores and cerata, but they different in oral hood posture. The change between behavior modes, therefore, is bridged by a relatively small postural adjustment, but it signals a long-term change in the animal's behavior pattern. A neurophysiological interpretation is that slight but mea- surable shifts in the activities of neurons involved in OH and AL behaviors car. result in a stable, lasting shift in motoi - • function. Incn a ' body size is correlated with an increase
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
