. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HYDRACTINI1D HVDROID SHAPE 401 24 0- 200- ~ 16-0- E cr hJ 120 cr UJ Q- 80- 4 0 00 186. 93 • 1^ • mm -JV -? f 5-4 00 075 1-5 2 25 30 AREAImm2) Figure 2. Perimeter versus area plots for two sibling Hydractinia colonies measured every other day for the first 5 weeks of ontogeny. Camera lucida tracings (not to scale) and shape measures (perim- eterffarea) are shown for some of the data points. While shapes fluctuate as stolons branch and fuse, the two colonies exhibit distinct trajectories in perimeter versus area space. ony
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HYDRACTINI1D HVDROID SHAPE 401 24 0- 200- ~ 16-0- E cr hJ 120 cr UJ Q- 80- 4 0 00 186. 93 • 1^ • mm -JV -? f 5-4 00 075 1-5 2 25 30 AREAImm2) Figure 2. Perimeter versus area plots for two sibling Hydractinia colonies measured every other day for the first 5 weeks of ontogeny. Camera lucida tracings (not to scale) and shape measures (perim- eterffarea) are shown for some of the data points. While shapes fluctuate as stolons branch and fuse, the two colonies exhibit distinct trajectories in perimeter versus area space. ony, and, in particular, either method shows the differ- ences between the crosses. At 50 days, cross 15X11 pro- duced significantly more irregular shapes than cross 15 X 13 (Table IV); analysis of the clonal repeatibility data shows the same pattern. If the log-transformed shape data are analyzed as replicates nested within crosses nested within positions, there is an effect of cross (F = , = 3, 24, P ). Analyzing the data as replicates nested within strains nested within crosses provides a similar result (no significant effect of strains F = , = 4, 24, P > but a significant effect of crosses F = , = , P 12 X 7 > 3 X 4). Discussion These results have implications with regard to mor- phological variation in hydractiniid hydroidsand in other clonal taxa as well. We discuss (1) the biological basis of shape in hydractiniid hydroids, (2) the implications of the Hydractinia breeding studies, (3) the general phenomenon of heterochrony in hydractiniid hydroids, and (4) the rel- evance of these results to other clonal taxa. 172(09) 15- 10- 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
