. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 25 30 July 100 - Isolated (N=26) - Rejected (N=28) - Fused (N=24) 10 15 20 25 30 October. - Isolated (N=33) - Rejected (N=14) - Fused (N=12) 10 15 20 25 30 10 15 20 25 30 Age (cycles) Figure 4. Survivorship curves for colonies of the ascidian Bittnllits schlosscri grown in Monterey Bay, California, in four cohorts and three allogeneic contact treatments. Arrows indicate the commencement of sexual reproduction in each cohort. The last point in each line represents the last surviving colony of each group. Note that survivorshi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 25 30 July 100 - Isolated (N=26) - Rejected (N=28) - Fused (N=24) 10 15 20 25 30 October. - Isolated (N=33) - Rejected (N=14) - Fused (N=12) 10 15 20 25 30 10 15 20 25 30 Age (cycles) Figure 4. Survivorship curves for colonies of the ascidian Bittnllits schlosscri grown in Monterey Bay, California, in four cohorts and three allogeneic contact treatments. Arrows indicate the commencement of sexual reproduction in each cohort. The last point in each line represents the last surviving colony of each group. Note that survivorship is plotted on a logarithmic scale. Data on isolated colonies were published previously as Figure 3 in Chadwick-Furman and Weissman (I995b). mediate between those of isolated and allocontacted colo- nies [total number of eggs produced = 1383 + 769 (x + SD), n = 9 xenocontacted colonies of Botryllus schlosseri that survived to maturity, N. E. Chadwick-Furman, pers. obs.; compare with October cohort in Fig. 3f], Thus, xeno- geneic contact appears to affect colony fecundity, but not as severely as allogeneic contact. The reduced fitness of colonies following fusion or re- jection may result from energetic or physiological costs associated •• ith recognizing and reacting to non-self tissue. The process oi interaction along the borders of rejecting colonies involves extensive tissue damage and resource demand on both colonies (Scofield and Nagashima, 1983: reviewed in Rinkevich, 1992). In addition, competition be- tween somatic and germ cell lines within fused chimeras also may draw heavily on the physiological resources of the partners involved (Buss, 1982). Colonies that are isolated from allogeneic contact do not face these costs. The lack of resorption observed here in field-raised chi- meras of Botiyllus schlosseri is in striking contrast to pre- vious results from laboratory studies (Rinkevich and Weiss- man, 1987, 1992a, b; Pancer et al., 1995). The reduced chimeric stab
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
