Nutrient regime shift in the western North Atlantic indicated by compound-specific δ15N of deep-sea gorgonian corals.

ABSTRACT: Despite the importance of the nitrogen (N) cycle on marine productivity, little is known about variability in N sources and cycling in the ocean in relation to natural and anthropogenic climate change. Beyond the last few decades of scientific observation, knowledge depends largely on proxy records derived from nitrogen stable isotopes (δ(15)N) preserved in sediments and other bioarchives. Traditional bulk δ(15)N measurements, however, represent the combined influence of N source and subsequent trophic transfers, often confounding environmental interpretation. Recently, compound-specific analysis of individual amino acids (δ(15)N-AA) has been shown as a means to deconvolve trophic level versus N source effects on the δ(15)N variability of bulk organic matter. Here, we demonstrate the first

SUBMITTER: Sherwood OA 

PROVIDER: S-EPMC3024653 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature