Environmental Earth Sciences

, Volume 73, Issue 7, pp 3109–3118 | Cite as

Use of stable isotope composition variability of particulate organic matter to assess the anthropogenic organic matter in coastal environment (Istra Peninsula, Northern Adriatic)

  • Petra Žvab RožičEmail author
  • Tadej Dolenec
  • Sonja Lojen
  • Goran Kniewald
  • Matej Dolenec
Original Article


Nitrogen and carbon stable isotope analysis of particulate organic matter (POM) was used to assess the impact of anthropogenically derived organic matter in coastal parts of the Istra Peninsula (Northern Adriatic). The investigation was conducted in areas potentially impacted and enriched with different amounts of organic matter. Elevated δ15N values in POM reflect enrichment of organic matter near the coast due to inadequate municipal infrastructure in cities and local septic systems as well as inputs from riverine terrestrial material. On the contrary, negative δ15N values reflect the depleting effect of purification plants. Significant differences in nitrogen stable isotope ratios were observed between western and southeastern coasts. The δ13C values show small depletion at sites with potentially greater anthropogenic impact. A weak temporal increase of δ15N from spring to late summer was observed. The results for nitrogen and carbon isotope ratios of POM and their comparisons with other areas suggest diverse amounts and sources of organic matter as well as differences in movement of floating POM within the water column. The δ15N and δ13C values reflect the ratios of marine and terrigenous organic matter, the latter being mainly anthropogenically influenced. The results finally suggest precaution in applicability of POM as tracers for detecting anthropogenic organic matter in marine coastal ecosystem.


Particulate organic matter (POM) Stable nitrogen (δ15N) and carbon (δ13C) isotopes Anthropogenic organic matter Istra Peninsula Northern Adriatic 



The research was financially supported by the Ministry of Higher Education, Science and Technology, Republic of Slovenia (bilateral projects between Croatia and Slovenia 2001–2009), Slovenian Research Agency (ARRS) and Geoexp, d.o.o., Tržič, Slovenia. Thanks to Boštjan Rožič for help in the field.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Petra Žvab Rožič
    • 1
    Email author
  • Tadej Dolenec
    • 1
  • Sonja Lojen
    • 2
  • Goran Kniewald
    • 3
  • Matej Dolenec
    • 1
  1. 1.Department of Geology, Faculty of Natural Sciences and EngineeringLjubljanaSlovenia
  2. 2.Jožef Stefan InstituteLjubljanaSlovenia
  3. 3.Ruđer Bošković InstituteZagrebCroatia

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