Tissue nitrogen and carbon variations in New England estuarineAscophyllum nodosum (L.) Le Jolis populations (Fucales,Phaeophyta) |
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| Authors: | M N Hardwick-Witman A C Mathieson |
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| Institution: | 1. Department of Botany and Plant Pathology, and Jackson Estuarine Laboratory, University of New Hampshire, 03824, Durham, New Hampshire
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| Abstract: | The seasonal patterns ofAscophyllum nodosum (L.) Le Jolis tissue composition (N, C and ash) and ambient inorganic N were measured for 18 months at seven sites throughout the Great Bay Estuary System, New Hampshire-Maine, U.S.A. Overall, the seasonal cycle of tissue N coincided with ambient dissolved inorganic N, with low values in the late spring and summer and highest values in late fall and winter. even so, a pronounced lag occurred in the spring when ambient nutrients decreased, and the levels of tissue N remained high. The seasonal patterns of tissue N were very similar throughout the estuary, although the spring maxima were conspicuously greater at inner than outer estuarine sites. No conspicuous seasonal trend was apparent for tissue C, and the C/N ratios merely reflected variation in N. The percent ash values were extremely variable, and they did not reflect a simple salinity gradient within the Estuary. Two examples of the potential significance ofAscophyllum to the nitrogen pools in northern New England estuaries are discussed. |
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