. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12345 hours after spawning Figure 3. Gamete age effects. Fertilization rates (mean and ranges) for gametes of Montipora digitata and Platygyra sinensis, eomhined at varying times after spawning. Eggs and sperm were separated at the time of spawning and later re-combined with gametes from other colonies. Male and female gametes were of the same age at the time of mixing. spawning event that included many faviid species. Weather conditions at the time of spawning were calm and the sea was glassy. During the first to 2 h af
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12345 hours after spawning Figure 3. Gamete age effects. Fertilization rates (mean and ranges) for gametes of Montipora digitata and Platygyra sinensis, eomhined at varying times after spawning. Eggs and sperm were separated at the time of spawning and later re-combined with gametes from other colonies. Male and female gametes were of the same age at the time of mixing. spawning event that included many faviid species. Weather conditions at the time of spawning were calm and the sea was glassy. During the first to 2 h after spawning, large numbers of eggs from P. sincnsix and other corals were visible at the sea surface around and near the drogues. The drogues moved slowly over the reef flat and were situated some 10-20 m off the edge of the reef by the time the last sample was taken hours after spawn- ing. The data in Figure 4 represent the pooled results from samples taken adjacent to, and midway between two drogues, since there was virtually no difference between the samples. Figure 4 clearly shows the fertilization po- tential for Platygyra sinensis rising to nearly 100% just after the initiation of spawning. During the next hour, rates were variable but slightly lower. By 3 hours after spawning, fertilization had dropped quite rapidly to near zero. This decrease is not due solely to an age effect, since it occurred earlier and was more pronounced than the reduction of fertilization observed in a concurrent lon- gevity trial in the lab (Fig. 4). Samples were also taken from 1 m below the surface beginning hours after C? 100 7T 80 g TO = 40 £ 20 0. 01234 hours after spawning Figure -4. Fertilization rates for Platygyra .wmvnjs resulting from water samples taken on the night of spawning. Each data point represents the mean and representative ranges of replicate vials (three sites each with three replicate vials). Time of spawning was determined by field observations. Solid squares:
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
