Abstract Each of the three major groups of seaweeds within the Gulf of Maine exhibits pronounced seasonal differences in species richness with summer maxima and winter minima. By contrast, widely different reproductive strategies occur, depending upon the specific taxa and environmental conditions. Some species exhibit conspicuous patterns of sporophytic or gametophytic dominance as well as pronounced variability of sex ratios. Several representative reproductive, growth and longevity patterns are compared, emphasizing diverse hydrographic, physical and historical factors. Cold temperate species dominate open coastal sites, while warm temperate or mixed floras are most conspicuous in estuarine habitats. Several disjunct populations occur north of Cape Cod, Massachusetts, particularly within estuarine habitats; some of these taxa may be relics of an earlier hypsithermal or warm period. thieson, Hehre and Reynolds 1981, Mathieson and Penniman 1986 a, b). The Gulf of Maine, which extends from Cape Cod, Since 1965 a variety of floristic, phenological and Massachusetts to Cape Sable, Nova Scotia, has a autecological investigations have been conducted by distinctive northern flora compared with that to the phycologists at the University of New Hampshire. south (cf. Chapman 1964, Coleman and Mathieson Mathieson and Hehre (1986) and Mathieson and Pen1974,1975, Hoek 1975, 1982, Setchell
Botanica Marina – de Gruyter
Published: Jan 1, 1989
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