. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POST-PALEOZOIC BRYOZOAN CLADE PERSEVERANCE 165 >, " CO •D 8 2 cB d ~ 3 i 3 6 z 2 100 80 <D O U) t O 60 20 Cyclostomes Cheilostomes • % Species % Recruits. 1991 1992 1993 1994 Figure 4. Number and proportion of cyclostome and cheilostome species and recruited colonies, identified at Signy Island, Antarctica, and plotted as a function of time. Data are shown as the mean (from three replicate panels) and standard error. Clade recruitment data were not separated into species after March 1993. study period (1991-1994)
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POST-PALEOZOIC BRYOZOAN CLADE PERSEVERANCE 165 >, " CO •D 8 2 cB d ~ 3 i 3 6 z 2 100 80 <D O U) t O 60 20 Cyclostomes Cheilostomes • % Species % Recruits. 1991 1992 1993 1994 Figure 4. Number and proportion of cyclostome and cheilostome species and recruited colonies, identified at Signy Island, Antarctica, and plotted as a function of time. Data are shown as the mean (from three replicate panels) and standard error. Clade recruitment data were not separated into species after March 1993. study period (1991-1994) in Antarctic waters (Fig. 4). Monthly, seasonal, and annual variabilities were high in both the timing and magnitude of recruitment in both clades. Between-panel variability was generally low except at peak settlement. But some cheilostome and cyclostome recruits were recorded in every month of the study. Of most note was the aphasic alignment of peak settlement for the two clades. Cheilostomes recruited in peak numbers at the start of the austral summer (December), and cyclostome recruit- ment usually occurred just before or after peak cheilostome recruitment (, spring and autumn). The proportion ot species constituted by cyclostome recruits typically varied between 20% and 40%-, but on three occasions was 50% or more. The proportion of recruits that were cyclostomes was, in contrast, considerably higher (especially outside summer periods) and more variable. Only on two occasions was the proportion of recruits smaller than that of the species. Vari- ability in the proportion of recruits was higher than that in the proportion of species, both in space (between panels) and time (between months). Therefore, the phases of re- cruitment of the two clades were not coincident, but scales were; and abundance of species (taxonomic richness) was decoupled from abundance of individuals (ecological dom- inance). Recruitment and community development at Lough Hyne As at Signy Islan
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
