naa a22 4500 510751156 CHVBK 20180411083105.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11270-013-1498-0 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1498-0 The Sources of Carbon and Nitrogen in Mountain Lakes and the Role of Human Activity in Their Modification Determined by Tracking Stable Isotope Composition [Elektronische Daten] [Michał Gąsiorowski, Elwira Sienkiewicz] We studied the isotopic composition of organic matter in the sediments of eight mountain lakes located in the Tatra Mountains (Western Carpathians, Poland). The sediments of the lakes were fine and course detritus gyttja, mud, and sand. The total organic carbon content varied from 0.5 to 53%. The C/N ratio indicated that in-lake primary production is the major source of the organic matter in the lakes located above the treeline, whereas terrestrial plant fragments are the major organic compounds in the sediments of dystrophic forest lakes. We also found that a clear trend of isotopic curves toward lower values of δ 13C and δ 15N (both ~3 ‰) began in the 1960s. This trend is a sign of the deposition of greater amounts of NO x from the combustion of fossil fuels, mainly by vehicle engines. The combustion of fossil fuels in electric plants and other factories had a smaller influence on the isotopic composition. This trend has been weaker since the 1990s. Animal and human wastes from pastures and tourism had a surprisingly minor effect on lake environments. These data are contrary to previous data regarding lake biota and suggest the high sensitivity of living organisms to organic pollution. The Author(s), 2013 Stable isotopes nationallicence Acidification nationallicence Eutrophication nationallicence Alpine lakes nationallicence Fossil fuel combustion nationallicence Gąsiorowski Michał Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda St. No. 51/55, 00818, Warsaw, Poland aut Sienkiewicz Elwira Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda St. No. 51/55, 00818, Warsaw, Poland aut Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-9 0049-6979 224:4<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1498-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1498-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gąsiorowski Michał Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda St. No. 51/55, 00818, Warsaw, Poland aut NATIONALLICENCE 700 1- Sienkiewicz Elwira Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda St. No. 51/55, 00818, Warsaw, Poland aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-9 0049-6979 224:4<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer