. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 24 Egg Age (h) Figure 2. Percentage of oocytes failing to develop to blastula when fertilized at several time intervals following spawning, from Arenicola iiiiiiiiiu (A), Nereis virens (B), and Asterias rubens (C). Note the difference in tiniescalc over which oocytes were viable for each of the species. Standard errors were calculated from the arcsine-transformed percentage data and back-transformed for presentation. coalesced into oily droplets at the bottom of the petri dish, and in this state it was quiescent. Nereis vire
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 24 Egg Age (h) Figure 2. Percentage of oocytes failing to develop to blastula when fertilized at several time intervals following spawning, from Arenicola iiiiiiiiiu (A), Nereis virens (B), and Asterias rubens (C). Note the difference in tiniescalc over which oocytes were viable for each of the species. Standard errors were calculated from the arcsine-transformed percentage data and back-transformed for presentation. coalesced into oily droplets at the bottom of the petri dish, and in this state it was quiescent. Nereis virens sperm stored at the higher concentration was similarly long lived. However, sperm stored at 10s sperm-ml"' rapidly lost the ability to fertilize, falling to almost zero after 24 h (Fig. 3B). In contrast, the fertiliz- ing capacity of Asterius nibens sperm stored at 10 sperm • ml ' and 103 sperm • ml~ ' was found to be similar (Fig. 3C). At each of the time points, success was slightly greater for the sperm stored at the higher concentration, but both successes fell to approximately zero after 26 h. Sperm stored in egf> water It is apparent that egg water had a marked effect upon the fertilizing capacity of sperm for both Arenieola marina (Fig. 4A) and Asterius rubens (Fig. 4B). The fertilization capacity of Arenicola. marina sperm stored in egg water tell to zero after 28 h, whereas that stored in SFSW remained at 100% (data were the same as in Fig. 3A). The fall in fertilization success of Asterias nibens sperm was even more dramatic, dropping to zero after 8 h. The fertilization success of sperm stored in SFSW is comparable to the data presented in Fig. 3C. Discussion The longevity of unfertilized oocytes has a marked im- pact upon fertilization success. This paper demonstrates that there is a finite period following spawning in which the oocyte is capable of being fertilized and subsequently de- veloping to at least the blastula stage. The choice of blas- tula
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
