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Titolo:
Ribbed mussel nitrogen isotope signatures reflect nitrogen sources in coastal salt marshes
Autore:
McKinney, RA; Nelson, WG; Charpentier, MA; Wigand, C;
Indirizzi:
US EPA, Atlantic Ecol Div, Narragansett, RI 02882 USA US EPA NarragansettRI USA 02882 tic Ecol Div, Narragansett, RI 02882 USA OAO Corp, Narragansett, RI 02882 USA OAO Corp Narragansett RI USA 02882OAO Corp, Narragansett, RI 02882 USA
Titolo Testata:
ECOLOGICAL APPLICATIONS
fascicolo: 1, volume: 11, anno: 2001,
pagine: 203 - 214
SICI:
1051-0761(200102)11:1<203:RMNISR>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ESTUARINE FOOD WEBS; STABLE ISOTOPES; ORGANIC-MATTER; CARBON; NITRATE; DELTA-C-13; MARINE; FLOW; BAY; PHOSPHORUS;
Keywords:
Geukensia demissa; land use characteristics; mussel; nitrogen input indicator; nitrogen isotope ratio; ribbed mussel; salt marsh;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: McKinney, RA US EPA, Atlantic Ecol Div, 27 Tarzwell Dr, Narragansett, RI 02882 USA US EPA 27 Tarzwell Dr Narragansett RI USA 02882 RI 02882 USA
Citazione:
R.A. McKinney et al., "Ribbed mussel nitrogen isotope signatures reflect nitrogen sources in coastal salt marshes", ECOL APPL, 11(1), 2001, pp. 203-214

Abstract

The stable nitrogen isotope ratio in tissue of the ribbed mussel (Geukensia demissa) was investigated as an indicator of the source of nitrogen inputs to coastal salt marshes. Initially, mussels were fed a diet of N-15-enriched algae in the laboratory to determine how the tissue nitrogen isotope ratio (delta N-15) changed with time. Steady-state times were calculated and found to be size dependent, ranging from 206 to 397 d. This indicated that mussels are long-term integrators of delta N-15 from their diet and may reflect nitrogen inputs to a marsh. Next, indigenous mussels were collected from 10 marshes with similar hydrology and geomorphology in Narragansett Bay,Rhode Island, USA, and mussel delta N-15 Values were evaluated as indicators of nitrogen source. Significant positive correlations were observed between delta N-15 in mussels and the fraction of residential development in the marsh watersheds. In contrast, mussel isotope ratios showed significant negative correlations with the fraction of combined agricultural and recreational land use. These correlations suggested that the mussel nitrogen isotope signature is influenced by nitrogen derived from human activities in theadjoining marsh watershed. A more detailed examination of these relationships indicated that land use practices in close proximity to marshes and estuarine characteristics may also influence the observed nitrogen isotope signature. A simple, empirical model based on the 10 watersheds was developed to predict mussel delta N-15 from land use characteristics. The predictive ability of the model was tested with data from 12 additional marshes havingsimilar geomorphology as the original 10, but differing in hydrology and mode of nutrient input. The model showed that ribbed mussel nitrogen isotopesignatures may provide information on the source of nitrogen to coastal areas. This could be of use in developing general policies or strategies for monitoring and assessing coastal eutrophication. In addition, the isotopic ratio of mussels is useful as a proxy for watershed land use practices whenassessing ecological responses to nutrient enrichment in coastal marshes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/21 alle ore 11:37:41