. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MAMJJASONDJ FMAMJJASONDJ FMAMJJASONDJ FMAMJJ 1971 '972 MONTH 19?3 l974 FIGURE 1. Percentage of specimens in the monthly samples containing sperm masses (upper), and the average density of eggs, embryos, and larvae observed for the total sponge population (lower). Data was not collected during the period, May to December, 1973. 5 oocytes/mm3 and 2 embryos/mm3. Within a population sample of 10 specimens the standard errors were 4 oocytes/mm3 and 2 embryos/mm3 for means near 20 oocytes/mm3 and 5 embryos/mm3. The rather high var
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MAMJJASONDJ FMAMJJASONDJ FMAMJJASONDJ FMAMJJ 1971 '972 MONTH 19?3 l974 FIGURE 1. Percentage of specimens in the monthly samples containing sperm masses (upper), and the average density of eggs, embryos, and larvae observed for the total sponge population (lower). Data was not collected during the period, May to December, 1973. 5 oocytes/mm3 and 2 embryos/mm3. Within a population sample of 10 specimens the standard errors were 4 oocytes/mm3 and 2 embryos/mm3 for means near 20 oocytes/mm3 and 5 embryos/mm3. The rather high variation in embyro densities reflects a clumping tendency within the sponge. Figure 1 shows the monthly occurrence of eggs, embryos, and larvae in the total sponge population and the percentage of specimens with sperm masses. Oocytes were first seen in the March samples during 1971 and 1972. However, in 1973 they were present as early as February 13, and in 1974 they did not appear until April 26. The maximum oocyte density for 1974 is also lower than the previous three years; TABLE I Sex ratio in late spring populations of Haliclona permollis at Yaquina Head, Oregon. Year Collection dates N Males Females Indifferent Chi2 Significance* 1971 May-June 25 12 13 0 0 No 1972 May-June 13 5 7 1 No 1973 April 24 3 20 1 Yes 1974 April-May 32 15 9 8 No Significant difference from a ratio of 1:1 at the 5% 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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