. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 30- 50- c o> o t/> o> 0 30- 10- --0---0- B 9 "' 200 sec 2 sec • c. 10-5 IO"4 IO'3 10-2 10-1 —1— •12 -10 1J O) in 1-8 "i E •6 0) • A O Q. -2 10 100 Intensity (w/m2) FIGURE 1. A. Per cent response (left ordinate) of positive (closed circle-solid line) and negative (open circle-dashed line) phototaxis to various stimulation intensities of 500 nm light (10 nm full band pass) (abscissa) by light adapted Stage I zoeae (replotted from Forward, 1974a). B. Percentage of light-adapted larvae showing a desce
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 30- 50- c o> o t/> o> 0 30- 10- --0---0- B 9 "' 200 sec 2 sec • c. 10-5 IO"4 IO'3 10-2 10-1 —1— •12 -10 1J O) in 1-8 "i E •6 0) • A O Q. -2 10 100 Intensity (w/m2) FIGURE 1. A. Per cent response (left ordinate) of positive (closed circle-solid line) and negative (open circle-dashed line) phototaxis to various stimulation intensities of 500 nm light (10 nm full band pass) (abscissa) by light adapted Stage I zoeae (replotted from Forward, 1974a). B. Percentage of light-adapted larvae showing a descent (left ordinate) upon termina- tion of 500 nm light stimulus at different intensities (abscissa) and duration of 2 (closed circles), 20 (closed triangles) and 200 (open circles) seconds. Average sample sizes for each intensity at the different times are 56, 68, and 44, respectively. Random movement in the vertically down- ward direction (C-closed circle) was determined with no stimulus present. Speeds of movement (right ordinate) were recorded during the descent (closed circles) after a 2 second stimulus at the various intensities and during sinking by anesthetized animals (S). Mean speeds were plotted and vertical lines indicate the standard deviation. The average sample size for the descent and sinking speeds are 29 and 150, respectively. and transverse axes was determined by placing freshly collected individual animals in a glass cuvette (ID 32 X 55 X 84 mm), filled with clear water of the same salinity as that in which the animals were collected. The cuvette was positioned in the sample compartment of a Gary Model 11 spectrophotometer and continuously scanned from 650 to 350 mm. The direction of the scans for all animals was descending. Plots of the apparent were made at 10 nm intervals even though the data were recorded continuously. These plots are the average of five animals within three specified size ranges, generally representing small, medium and l
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
