Abstract
Abstract The demography of Dictyopteris undulata Holmes was studied between 1979 and 1982 at Isthmus Reef, Santa Catalina Island, California (USA), at depths ranging from 4.6 to 10.7 m below mean lower low water. Maximum density of plants of taggable size (6 cm) occurred at about 6.1 m. Maximum plant height increased significantly with depth. The species was an annual. Reproductive plants were first observed 6–8 months after recruitment and were most abundant in autumn. Once plants became reproductive, they lived for an average of 1.7 months. Recruitment was most common in winter and early spring. Recruitment varied significantly with depth, reaching a maximum at 6.1–7.6 m, essentially the same depth as maximum density. The plants were recruited readily into cleared spaces; once they became established, vegetative reproduction seemed to be an important means by which the population was maintained. Plants at the deepest depth studied (10.7 m) had the highest survival rate. Plant loss was due either to deta...
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