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| Titel |
Water quality, isoscapes and stoichioscapes of seagrasses indicate general P limitation and unique N cycling in shallow water benthos of Bermuda |
| VerfasserIn |
J. W. Fourqurean, S. A. Manuel, K. A. Coates, W. J. Kenworthy, J. N. Boyer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 20 ; Nr. 12, no. 20 (2015-10-30), S.6235-6249 |
| Datensatznummer |
250118147
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| Publikation (Nr.) |
 copernicus.org/bg-12-6235-2015.pdf |
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| Zusammenfassung |
| Striking spatial patterns in stable isotope ratios (isoscapes) and elemental
ratios (stoichioscapes) of seagrass leaves and the water column nutrients
indicate general P-limitation of both water column and benthic primary
productivity on the Bermuda Platform, and they highlight the role of the
Bermuda Islands as a source of N and P. We found consistent differences
among the four seagrass species (Syringodium filiforme,
Thalassia testudinum, Halodule sp. and Halophila decipiens) in the N, P, δ13C
and δ15N of leaf tissues. The δ15N of
seagrass leaves was especially variable, with values from −10.1 to 8.8 ‰,
greatly expanding the reported range of values for
all seagrass species globally. Spatial patterns from both the water column
and the seagrass leaves indicated that P availability was higher near shore,
and δ15N values suggest this was likely a result of human waste
disposal. Spatially contiguous areas of extremely depleted seagrass 15N
suggest unique N sources and cycling compared to other seagrass-dominated
environments. Seagrass N : P values were not as far from the stoichiometric
balance between N and P availability as in the water column, and there were
no strong relationships between the water column N : P and the seagrass N : P.
Such isoscapes and stoichioscapes provide valuable ecogeochemical tools to
infer ecosystem processes as well as provide information that can inform
food web and animal movement studies. |
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