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Anthropogenic Influence on the 14C Activity and Other Constituents of Recent Lake Sediments: A Case Study1

Published online by Cambridge University Press:  18 July 2016

Dušan Srdoč ,
Nada Horvatinčić ,
Marijan Ahel ,
Walter Giger ,
Christian Schaffner ,
Ines Krajcar Bronić ,
Donat Petricioli ,
Jože Pezdič ,
Elena Marčenko  and
Anđelka Plenković-Moraj
Dušan Srdoč
Affiliation:
Rudjer Bošković Institute, 41001 Zagreb, Croatia
Nada Horvatinčić
Affiliation:
Rudjer Bošković Institute, 41001 Zagreb, Croatia
Marijan Ahel
Affiliation:
Rudjer Bošković Institute, 41001 Zagreb, Croatia
Walter Giger
Affiliation:
Swiss Federal Institute for Water Resources and Water Pollution Control, 8600 Dübendorf, Switzerland
Christian Schaffner
Affiliation:
Swiss Federal Institute for Water Resources and Water Pollution Control, 8600 Dübendorf, Switzerland
Ines Krajcar Bronić
Affiliation:
Rudjer Bošković Institute, 41001 Zagreb, Croatia
Donat Petricioli
Affiliation:
Rudjer Bošković Institute, 41001 Zagreb, Croatia
Jože Pezdič
Affiliation:
Jožef Stefan Institute, 61000 Ljubljana, Slovenia
Elena Marčenko
Affiliation:
Rudjer Bošković Institute, 41001 Zagreb, Croatia
Anđelka Plenković-Moraj
Affiliation:
Faculty of Natural Sciences, Department of Botany, University of Zagreb, Zagreb, Croatia
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Abstract

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Anthropogenic activities that introduce an excess of nutrients and other pollutants into rivers and lakes are causing significant changes in their aquatic environment. Excessive nutrients greatly accelerate eutrophication, and lake marl formed during eutrophication differs from that formed in oligotrophic water.

We analyzed recent sediment cores from Prošće and Kozjak lakes located in Plitvice National Park, central Croatia. Analyses consisted of 14C activity of calcareous lake marl, the ratio of stable isotopes (δ13C, δ18O), organic compounds in the sediment and the distribution of diatoms. Previous 14C activity measurements helped to determine the sedimentation rate and thus the time period of increased input of nutrients into lakes. We determined the increased 14C activity in lake sediments caused by nuclear bomb effect in recent depth profiles. We attributed the sudden increase in diatom species, Cyclotella operculata unipuctata and Achnanthes clevei rostrata, in the uppermost 5-cm layer, to eutrophication of the lake water.

We performed a molecular characterization of hydrocarbons isolated from the sediments, and applied computer-assisted high-resolution gas chromatography/mass spectrometry to estimate contributions of biogenic, fossil and pyrolytic hydrocarbons.

Type
II. Applied Isotope Geochemistry
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 585 - 592
Copyright
Copyright © The American Journal of Science 

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