. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. May 19 (N = 35) 5 32 10 69 15 103 1) CL, July 3 (N = 26) 5 33 10 64 15 99 20 141 Age (cycles) Age (days) October 15 (N = 33). in Monterey Bay. Presented Figure 3. Survivorship curves of the colonial ascidian Botryllus vcW are four cohorts, each settled at the date shown. Arrows indicate the beginning of sexual reproduction in each cohort. Note that survivorship is plotted on a logarithmic scale. trast, colonies grown in the laboratory tend to branch and produce extensions along the substratum; these extensions may fragment i
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. May 19 (N = 35) 5 32 10 69 15 103 1) CL, July 3 (N = 26) 5 33 10 64 15 99 20 141 Age (cycles) Age (days) October 15 (N = 33). in Monterey Bay. Presented Figure 3. Survivorship curves of the colonial ascidian Botryllus vcW are four cohorts, each settled at the date shown. Arrows indicate the beginning of sexual reproduction in each cohort. Note that survivorship is plotted on a logarithmic scale. trast, colonies grown in the laboratory tend to branch and produce extensions along the substratum; these extensions may fragment into subcolonies (Rinkevich and Weissman, 1987; N. E. Chadwick-Furman, pers. obs.). In addition, the life history patterns of colonies in the field seem to differ from those in the laboratory. Members of all field cohorts at Monterey exhibited the same general features: rapid growth, short and intense reproduction, short lifespan, and senescence soon after reaching maturity (Figs. 1-3). In contrast, Monterey colonies raised in the laboratory have been observed to grow slowly or shrink over many months, to cease reproduction long before death, and to live for more than 2 years (Boyd et a/.. 1986; Rinkevich and Weissman, 1987; Rinkevich et ai. 1992). Also in Mediterranean populations, the same life history differences are exhibited between field- and laboratory- raised colonies (Brunetti, 1974; Brunetti and Copello. 1978). Several factors may be responsible for these differences. Under laboratory conditions, water motion is slower, and paniculate food is less varied and abundant than for B. schlosseri populations in the field (Milkman, 1967; Bru- netti and Copello, 1978; Carwile, 1989). In addition, the absence of natural grazers in the laboratory may lead to the formation of a fouling film that inhibits the attachment and growth of colonies (Boyd et a/.. 1986; N. E. Chadwick- Furman, pers. obs.). Laboratory culture is important for the maintenance of genetically defined stocks th
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
