Isotopic variations of the nitrogen in Lake Superior

Details Isotopic variations of the nitrogen in Lake Superior Isotopic variations of the nitrogen in Lake Superior

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..811p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 6, pp.811-814

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Scientific paper

The isotopic compositions of nitrogen in lake water, plankton samples and the organic-N fractions extracted from sediments at selected stations in Lake Superior are presented. The 15 N values of the Kjeldahl total-N and acid hydrolyzable-N in the lake sediments are similar (range, +4.7-+6.7; mean, +5.5 %.). The 15 N data for the various extracts are independent of the age and concentration of nitrogen in the sediments. On the other hand, the 15 N values of lake water (+ 0.6 ), phytoplankton (+ 1.6 %.) and Zooplankton (+ 5.0 ) in the water column suggest significant discrimination against the heavier nitrogen isotope in the food chain of the lacustrine environment. The data emphasize the need for a better understanding of the autogenous isotopic fractionation before the isotopic method can be used to fingerprint the sources of nitrogen in a limnetic ecosystem.

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