. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ASCIDIAN-ALGAL LARVAL ECOLOGY 231 25 H NUMBER 0 F LARVAE SETTLED 0 25. 0 12345 012345 DISTANCE FROM EDGE (cm) FIGURE 6. Distributions of edge distances of larvae that settled on the undersides of settling panels at 2 and 4 m depth during one week in December, 1981, and January, 1982. Survivorship experiment Four days of full sunlight was lethal to the newly settled larvae (Table V). Healthy juveniles are colored bright green by their symbiotic algae. They have few spicules and thus the algae can be seen through the tunic. Ju
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ASCIDIAN-ALGAL LARVAL ECOLOGY 231 25 H NUMBER 0 F LARVAE SETTLED 0 25. 0 12345 012345 DISTANCE FROM EDGE (cm) FIGURE 6. Distributions of edge distances of larvae that settled on the undersides of settling panels at 2 and 4 m depth during one week in December, 1981, and January, 1982. Survivorship experiment Four days of full sunlight was lethal to the newly settled larvae (Table V). Healthy juveniles are colored bright green by their symbiotic algae. They have few spicules and thus the algae can be seen through the tunic. Juveniles exposed to full sunlight changed from bright green to light green to grayish-brown, then withered and died. Colonies in the shade appeared healthy and of normal size and color, as did the control colonies. Colonies beneath the clear plexiglas roof did not die as rapidly as those fully exposed, probably because they were shaded by a small amount of sed- iment which accumulated each day on the plexiglas roof. They did, however, show the same evidence of deterioration and their mortality was also high. This is inter- esting since plexiglas is an effective filter of ultraviolet radiation (Jagger, 1977). Larval swimming time experiments D. molle larvae are capable of swimming for more than an hour if they do not find a suitable site for settlement (Fig. 10). In the clear treatment, all nonsettled TABLE IV Mean edge distances (X) of larvae settled on the bottoms of settling panels at 2 and 4 m depths* Depth (m) December sample January sample X X Measurements are cm from the edge of the panel, = standard 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
