Assessing trends in nutrient concentrations in coastal shelf seas: a case study in the Irish Sea.

Gowen, Richard J, Hydes, D J, Mills, Dave, Stewart, B M, Brown, J, Gibson, C E, Shammon, T M, Allen, M and Malcolm, Stephen J (2002) Assessing trends in nutrient concentrations in coastal shelf seas: a case study in the Irish Sea. Estuarine Coastal and Shelf Science, 54 (6). pp. 927-939. ISSN 10960015

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Single point time-series data collected in the Irish Sea since 1954 by Allen et al. (1998) have been re-evaluated using more recent data and areal winter surveys of the Celtic and Irish Seas. Survey data illustrate the heterogeneity of nutrient distributions with N (≈28 M) and P (2·0 M) enrichment of the eastern Irish Sea relative to the western Irish Sea (7–8 M N and 0·7 M P). Salinity nutrient relationships demonstrate distinct regional differences throughout the two seas. Trends in the Isle of Man time-series are unlikely to have resulted from changes in analytical procedures and personnel. Concerns over data quality cannot be resolved and there are no independent data to validate the time-series. Including more recent data shows P has declined since the late 1980s and N concentrations have remained stable since the mid 1970s. The absence of a Si trend is consistent with limited anthropogenic influence on riverine Si concentrations. Trends in N and P are consistent with changes in riverine concentrations of these two nutrients and the biogeochemical processes controlling their cycling in shelf waters. Denitrification is the most likely reason for offshore Irish Sea concentrations of N being lower than expected.

Item Type: Article
Print ISSN: 10960015
Uncontrolled Keywords: Eutrophication; Nutrients; Salinity; Nitrogen; Silicon; Phosphorous; Irish Sea; Time-series analysis;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
Dewey Decimal Subjects: 500 Science > 550 Earth sciences & geology
500 Science > 570 Life sciences; biology > 577 Ecology
Library of Congress Subjects: Q Science > QD Chemistry
Q Science > QH Natural history
Item ID: 1687
Depositing User: RAE Import
Date Deposited: 23 Jun 2008 08:19
Last Modified: 15 Apr 2014 09:09

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