Vertical Distribution and Longevity of Subtidal Seaweeds in Northern New England, U.S.A.

Publisher Website
Google Scholar
Abstract
Seasonal collections of subtidal seaweeds were made at 12 adjacent open coastal sites in northern New England from 1965-1969 to document the longevity and vertical distribution of the flora. A total of 110 taxa were recorded. Wide variations of species diversity were noted at nearby locations with similar hydrographic conditions, depending upon substrate availability, sand scouring and wave action. Most species (88%) showed a continuous vertical distribution from the upper to the mid or lower subtidal zone. The lower limits of vegetation were dominated by a variety of turf, crustose and foliose-fleshy red algae. A consistent vertical pattern was recorded, with decreasing ratios of annuals/perennials, Chlorophyceae/Rhodophyceae and number of species with increasing depths. The composition and distribution of the subtidal flora are discussed in relation to a variety of parameters, including light, temperature and substrate. Several generalizations regarding the biology-ecology of the deep water North Atlantic flora are summarized.