Naslov
Carbon Isotope Fractionation in Karst Aquatic Mosses

Autori
Sironić, Andreja ; Alegro, Antun ; Horvatinčić, Nada ; Barešić, Jadranka ; Brozinčević, Andrijana ; Vurnek, Maja ; Krajcar Bronić, Ines ; Borković, Damir ; Lovrenčić Mikelić, Ivanka

Izvornik
Isotopes in environmental and health studies (1025-6016) 57 (2021), 2; 142-165

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
aquatic mosses ; karst ; photosynthesis ; carbon-13 ; carbon-14 ; Croatia ; Isotope ecology ; isotope fractionation

Sažetak
Radiocarbon activity (a14C) and 13C composition (δ13C) were measured in hygrophyte and mesophyte (land) mosses collected in the natural habitat of the Plitvice Lakes and along the Zrmanja and Krupa Rivers (typical continental and Mediterranean climates, respectively), Croatia. a14C and δ13C values of mosses, of atmospheric CO2 and dissolved inorganic carbon (DIC) were compared for contemporary data and for data from 30 years ago at the Plitvice Lakes when 14C activity of atmospheric CO2 was ~30% higher. A positive 18 correlation between a14Cmoss and δ13Cmoss was observed for all data reflecting change of 19 carbon isotopic composition in DIC along the water flows and in atmospheric CO2 regardless of the climatic regions and historic period. Fraction of the atmospheric carbon in moss (ωatm. C) and carbon fractionation factor from aquatic CO2 (DIC) to moss tissue (εmoss/g-aq) were calculated for each individual moss. Three species of mosses had ωatm. C ~0 % implying that they turn to anabiosis during dry periods. The relation εmoss/g-aq vs. ωatm. C differentiates true aquatic and amphiphyte mosses. The first had a statistically significant negative correlation between εmoss/g-aq and ωatm. C. The amphiphyte mosses had lower εmoss/g-aq with higher water flow rates.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija, Biologija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA