. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BRYOZOAN GROWTH AND REPRODUCTION 279 • Reproductive I I Not reproductive. 0123456789 Colony Size (No. bifurcations) Figure 3. Reproduction as a function of size in Bugula neritina col- onies under experimental conditions. Data are shown for experimental juveniles from Panama City after 5 weeks, and for natural recruits de- rived from Alligator Point after the same period of time. I 'aria!ion in growth At the time of the first experiment (25 March 1986), there were no mature Bugula neritina colonies in sea- grass meadows or a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BRYOZOAN GROWTH AND REPRODUCTION 279 • Reproductive I I Not reproductive. 0123456789 Colony Size (No. bifurcations) Figure 3. Reproduction as a function of size in Bugula neritina col- onies under experimental conditions. Data are shown for experimental juveniles from Panama City after 5 weeks, and for natural recruits de- rived from Alligator Point after the same period of time. I 'aria!ion in growth At the time of the first experiment (25 March 1986), there were no mature Bugula neritina colonies in sea- grass meadows or at Alligator Point marina, which had been the source population for other demographic work (Keough, 1986; Keough and Chernoff, 1987), and where colonies mature at the same size as those from seagrass meadows (Keough, unpub. obs.). Therefore, I collected colonies from a sunken barge approximately 4 km off Panama City, at a depth of 20 m. Parental colonies were separated from each other by >10 m, to reduce the chance that they were closely related. After 2 days in the dark, the colonies were exposed to bright light and the four colonies that released the most larvae were used in the experiment. Four or five larvae from a given colony were pipetted individually into a sterile plastic petri dish (50-mm diam- eter) containing seawater, and allowed to settle and metamorphose. Juveniles close to the edges of plates were removed. Without removing it from the water, each dish then had a 4-mm hole drilled into its center, and was bolted to a 60 X 20 cm piece of clear plexiglass. Each plexiglass sheet held 16 dishes in two rows of 8, with 4 dishes from each parental colony. The dishes were not arranged randomly, but in four 2x2 arrays, each array containing one dish from each parental colony. Two of the arrays were at ends of the plexiglass plates, and the positions of the dishes were further constrained so each parent appeared once at the corner of a plate and three times away from t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
