. The Biological bulletin. Biology; Zoology; Marine biology. ^ jJse* _, TIME 1730 PARACALANUS CRASSIROSTRIS 1900 2400 0530 0730 0930 1300 1630 '^«. Figure 4. Vertical migration of Paracalanus crassirostris, Acartia lilljeborgi and Cala- nopia americana. The numbers of animals at various levels in glass cylinders were determined at intervals through the day and night. The numbers across the top of each diagram show the time. Each small diagram shows the percentage distribution at a particular time at different levels of the water column (see percentage scale at top right). Water levels are indi
. The Biological bulletin. Biology; Zoology; Marine biology. ^ jJse* _, TIME 1730 PARACALANUS CRASSIROSTRIS 1900 2400 0530 0730 0930 1300 1630 '^«. Figure 4. Vertical migration of Paracalanus crassirostris, Acartia lilljeborgi and Cala- nopia americana. The numbers of animals at various levels in glass cylinders were determined at intervals through the day and night. The numbers across the top of each diagram show the time. Each small diagram shows the percentage distribution at a particular time at different levels of the water column (see percentage scale at top right). Water levels are indicated in mm. on the left. Light intensity is indicated in lux on the right. The curves show the light intensity during daylight hours; the solid line gives the intensity on one side of the cylinders and the broken line on the other. For Acartia the illumination at 1430 is indicated on the right and the illumination at 1700 at the left side. The heavy line at zero level represents the per- centage of animals at the bottom. Total number of individuals: Paracalanus, control—113; rhodamine B—70; fluorescein sodium—104; Acartia, control—^235; rhodamine B—434; fluores- cein sodium—147; Calanopia, control—195 ; rhodamine B—240; fluorescein sodium—152. The number of animals used varied considerably, as shown. Experiments in which different num- bers were used (usually smaller than these) gave similar results. Temperatures: Paracalanus, °° C; Acartia, °° C; Calanopia, °° C. It is to be noted that the temperature range was considerable during some diurnal cycles and series of experiments. How- ever, individual experiments carried out over smaller, and different, ranges (°° C; °° C.) gave similar Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
Size: 2800px × 893px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
