Species Composition and Seasonality of New England Seaweeds Along an Open Coastal-estuarine Gradient

Species Composition and Seasonality of New England Seaweeds Along an Open Coastal-estuarine Gradient Abstract The species composition and seasonal occurrence of seaweed populations at twelve sites in southern Maine and New Hampshire, U. S. A., ranging from offshore open coastal to inner estuarine habitats, were evaluated based upon extensive seasonal collections. Approximately 70% of the species (i. e. 141 of 202 taxa) exhibited cosmopolitan patterns of varying degrees; 67 species were restricted to the open coast and 21 to the Great Bay Estuary System. Only three species, Cladophora sericea, Enteromorpha prolifera and Ulva lactuca, occurred at all twelve sites. A diminution of the number of total species and perennial taxa and the ultimate dominance of green algae were noted in upstream habitats with fluctuating hydrographic conditions and limited rocky substrata. The open coastal sites were dominated by cold temperate species, while warm temperate or 'mixed floras' were more conspicuous within the Estuary. Varying phenological and longevity patterns were evident depending upon hydrographic and physical parameters. Introduction ' Until recently few detailed phenological accounts of New England seaweeds have been conducted (cf. Coleman and Mathieson 1975; Lamb and Zimmerman 1964; Mathieson, Hehre and Reynolds 1981, Sears and Wilce 1975) because of the area's extreme winter conditions. Currently there is a paucity of http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Species Composition and Seasonality of New England Seaweeds Along an Open Coastal-estuarine Gradient

Botanica Marina, Volume 29 (2) – Jan 1, 1986

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0006-8055
eISSN
1437-4323
DOI
10.1515/botm.1986.29.2.161
Publisher site
See Article on Publisher Site

Abstract

Abstract The species composition and seasonal occurrence of seaweed populations at twelve sites in southern Maine and New Hampshire, U. S. A., ranging from offshore open coastal to inner estuarine habitats, were evaluated based upon extensive seasonal collections. Approximately 70% of the species (i. e. 141 of 202 taxa) exhibited cosmopolitan patterns of varying degrees; 67 species were restricted to the open coast and 21 to the Great Bay Estuary System. Only three species, Cladophora sericea, Enteromorpha prolifera and Ulva lactuca, occurred at all twelve sites. A diminution of the number of total species and perennial taxa and the ultimate dominance of green algae were noted in upstream habitats with fluctuating hydrographic conditions and limited rocky substrata. The open coastal sites were dominated by cold temperate species, while warm temperate or 'mixed floras' were more conspicuous within the Estuary. Varying phenological and longevity patterns were evident depending upon hydrographic and physical parameters. Introduction ' Until recently few detailed phenological accounts of New England seaweeds have been conducted (cf. Coleman and Mathieson 1975; Lamb and Zimmerman 1964; Mathieson, Hehre and Reynolds 1981, Sears and Wilce 1975) because of the area's extreme winter conditions. Currently there is a paucity of

Journal

Botanica Marinade Gruyter

Published: Jan 1, 1986

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