Heavy d15N in intertidal benthic algae and invertebrates in the Scheldt Estuary (The Netherlands): effect of river nitrogen inputs
Riera, P.; Stal, L.J.; Nieuwenhuize, J. (2000). Heavy d15N in intertidal benthic algae and invertebrates in the Scheldt Estuary (The Netherlands): effect of river nitrogen inputs. Est., Coast. and Shelf Sci. 51(3): 365-372. http://dx.doi.org/10.1006/ecss.2000.0684
The study investigated d 15N in the intertidal benthic food webs from the middle Westerschelde Estuary and the middle Oosterschelde. Much heavier d 15N values were observed for the main benthic primary producers and invertebrates in the Westerschelde Estuary. In the Oosterschelde, mean d 15N values ranged from 1.4 to 7.3ppt for SOM and suspended POM, respectively, to 6.3 to 9.1ppt for Fucus vesiculosus and benthic diatoms, respectively. Mean d 15N values in benthic invertebrates ranged from 9.7ppt for Gammarus locusta to 15.4ppt for Tubificoides sp. In the Westerschelde Estuary, mean d 15N increased from 8.1 to 8.6ppt for suspended POM and SOM, respectively, to heavier d 15N from 15.9 to 28.5ppt for F. vesiculosus and benthic diatoms, respectively. Mean d 15N for intertidal invertebrates ranged from 18.1ppt for Lumbricillus sp. to 20.7ppt for Eulimnogammarus obtusatus. Higher enrichment in 15N in benthic primary producers and invertebrates from the Westerschelde Estuary are most likely due to the incorporation of 15N-enriched DIN carried by the Scheldt River by benthic algae and, then by benthic consumers. These results point to the fact that d 15N in benthic estuarine food webs may respond directly to anthropogenic nitrogen inputs delivered into estuaries by rivers which drain highly urbanized areas.
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