. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 A. N. SASTRY a: iii o e> 0 -TOTAL PLANKTON NANOPLANKTON PHOTOSYNTHESIS. JAN, 1963 MAR MAY JUL SEP NOV MONTH FIGURE 3. The phytoplankton production in the Beaufort Channel, North Carolina. The scallops were collected in the same locality. (The results on phytoplankton production are being published by Dr. Richard Williams, Radiobiological Laboratory, U. S. Fish and Wildlife Service, in a separate paper. I am indebted to Dr. Williams for permitting me to quote his results here.) (Table I) appear to follo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 A. N. SASTRY a: iii o e> 0 -TOTAL PLANKTON NANOPLANKTON PHOTOSYNTHESIS. JAN, 1963 MAR MAY JUL SEP NOV MONTH FIGURE 3. The phytoplankton production in the Beaufort Channel, North Carolina. The scallops were collected in the same locality. (The results on phytoplankton production are being published by Dr. Richard Williams, Radiobiological Laboratory, U. S. Fish and Wildlife Service, in a separate paper. I am indebted to Dr. Williams for permitting me to quote his results here.) (Table I) appear to follow closely the increasing temperature and phytoplankton production beginning in May. EXPERIMENTAL RESULTS The groups of animals maintained at various temperatures are shown in Table II. The gonad index, digestive gland index and the microscopical condition of the sample analyzed from the same collection to which these temperature groups belonged, provided the basis for assessing the temperature effects in reproductive period (Table I). Temperature effects on gonad groivth and gametogenesis (Group /) Temperature effects on group I are shown in Table III. The gonad index and digestive gland index decreased at all the temperatures, but their decrease was more rapid at higher temperatures. The gonads of animals at 10° C. were whitish and spermatocytes were observed in biopsies from testis and ovary. Spermatocytes were observed in gonadal biopsies of animals at 20° C. and 30° C. Oogonia and oocytes were absent. At these temperatures the gonads were translucent, indicating TABLE II Groups of scallops collected at intervals during the reproductive period and maintained at different temperatures Group Date collected and intro- duced to experimental temperatures Experimental temperatures ± ° C. Total number of animals Size mm. mean± I 6/11/64 10, 20, 30 24 ± II 7/6/64 10, 15, 20, 25, 30 50 ± III 8/20/64 10, 15, 20, 25, 30 50 ± IV 10/20
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
