. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A. R. HOLYOAK 1986, 1988; Rosen, 1986; Lasker, 1990; McFadden, 1991; Stocker, 1991). That uncertainty eliminates the possibility of measuring age-related effects at the level of genets. To further complicate matters, ramets of some modular species can fuse with other ramets of the same or different genotype (Hughes and Jackson, 1985; Rin- kevich and Weissman, I987a, b; Stocker, 1991; Pancer el al., 1995). One way to be sure of the origins, ages, and fates of colonies of modular organisms is to conduct lon- gitudinal site sur
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A. R. HOLYOAK 1986, 1988; Rosen, 1986; Lasker, 1990; McFadden, 1991; Stocker, 1991). That uncertainty eliminates the possibility of measuring age-related effects at the level of genets. To further complicate matters, ramets of some modular species can fuse with other ramets of the same or different genotype (Hughes and Jackson, 1985; Rin- kevich and Weissman, I987a, b; Stocker, 1991; Pancer el al., 1995). One way to be sure of the origins, ages, and fates of colonies of modular organisms is to conduct lon- gitudinal site surveys, as suggested by Berrill (1950) when he stated that "the age of (compound) ascidians is prac- tically impossible to estimate, unless a certain inhabited area is followed closely through seasons and ; That is sound advice if one hopes to understand the life histo- ries of modular species, because age, size, and shape of modular colonies may not be as tightly linked as those parameters are to body size among unitary organisms (Hughes and Jackson, 1980; Jackson and Coates, 1986; Hughes and Connell, 1987). In the present study I use monthly site surveys con- ducted over years to describe the pattern of whole colony growth and the consequences of that growth for intertidal Polyclimnn planum growing in situ. In so doing I try to determine whether the growth pattern of P. pla- num colonies more closely approximates Sebens' (1987) Type II or III pattern of growth, or some other pattern, and to discern what factor or factors constrain whole col- ony growth in this species. I hypothesize that the growth pattern of P. planum will be more similar to Sebens' (1987) Growth Type III (Plas- tic attenuating growth) than to his Growth Type II (Plas- tic exponential growth). 1 chose Type III rather than Type II because the colonies at my study sites live in a wave- and surge-impacted environment, and the associ- ated water-flow forces may impose limits to colony size. Wat
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
