. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE AND NUTRITIONAL CYCLES 227 EXPERIMENTAL DATA 1. The reproductive cycle of S. f>nrf>itratits The data for the gonad index of the purple sea urchin for the year 1953-54 are given in Figures 1 and 2, along with similar data for 1952-53. It is evident that only a single breeding cycle occurred at Pescadero Point during 1953-54, whereas the data from the same location in 1952-53 suggest the possibility of a second cycle. At Yankee Point there was a dip in February, 1954 which appears to correspond to that at Pe
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE AND NUTRITIONAL CYCLES 227 EXPERIMENTAL DATA 1. The reproductive cycle of S. f>nrf>itratits The data for the gonad index of the purple sea urchin for the year 1953-54 are given in Figures 1 and 2, along with similar data for 1952-53. It is evident that only a single breeding cycle occurred at Pescadero Point during 1953-54, whereas the data from the same location in 1952-53 suggest the possibility of a second cycle. At Yankee Point there was a dip in February, 1954 which appears to correspond to that at Pescadero Point in February, 1953; but this may be spurious, since it is due to the presence of 8 spawned-out animals among the 20 of the sample, the 0 N D F M A M J J A 25- 20- X Id Q 10 - z o 0. 15-. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
