. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 24 48 72 96 (C): .Asterias rubens. 4 8 12 16 20 24 Egg Age(h) Figure 1. Oocyte fertilization success at a number of time intervals following spawning in Arenicola marina (AI, Nereis virens (B), and Asterias rubens (C). Note the difference in timescale over which oocytes were viable for each of the species. Standard errors were calculated from the arcsine-transformed percentage data and back-transformed for presen- tation. increase in abnormal development before blastula coincided with the greatest drop in fertilization suc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 24 48 72 96 (C): .Asterias rubens. 4 8 12 16 20 24 Egg Age(h) Figure 1. Oocyte fertilization success at a number of time intervals following spawning in Arenicola marina (AI, Nereis virens (B), and Asterias rubens (C). Note the difference in timescale over which oocytes were viable for each of the species. Standard errors were calculated from the arcsine-transformed percentage data and back-transformed for presen- tation. increase in abnormal development before blastula coincided with the greatest drop in fertilization success. Most oocytes of Nereis virens could be fertilized for at least 72 h after extraction from the coelomic cavity (Fig. IB); however, the developmental capacity decreased throughout this period so that from 60 h on, only about 10% of the oocytes developed to blastula (Fig. 2B). In contrast to the polychaetes, Asterias rubens showed 100% fertilization of oocytes for only the first 4 h after spawning (Fig. 1C). Thereafter, fertilization success fell to zero by 24 h. Cases of abnormal development rose gradually with increasing age (Fig. 2C). Sperm age Arenicola marina sperm stored at 105 sperm • ml ' re- tained a high fertilization capacity up to 60 h post-spawning, before dropping to almost zero at 86 h (Fig. 3A). The same graph shows the fertilization success of sperm stored at 104 sperm • ml"1. Success remained high throughout the exper- iment and continued beyond the time shown in the figure. When examined, sperm stored at 104 sperm • mF' hud. 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, Alfre
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