Articles | Volume 14, issue 6
Biogeosciences, 14, 1617–1630, 2017
Biogeosciences, 14, 1617–1630, 2017

Research article 28 Mar 2017

Research article | 28 Mar 2017

C  ∕ N ratio, stable isotope (δ13C, δ15N), and n-alkane patterns of brown mosses along hydrological gradients of low-centred polygons of the Siberian Arctic

Romy Zibulski1,2, Felix Wesener4, Heinz Wilkes3,5, Birgit Plessen3, Luidmila A. Pestryakova6, and Ulrike Herzschuh1,2,7 Romy Zibulski et al.
  • 1Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 14473 Potsdam, Germany
  • 2University of Potsdam, Institute of Earth and Environmental Sciences, 14476 Potsdam-Golm, Germany
  • 3Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany
  • 4Humboldt University of Berlin, Institute of Biology, 10115 Berlin, Germany
  • 5Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University, 26111 Oldenburg, Germany
  • 6Northeast Federal University, Department for Geography and Biology, 677000 Yakutsk, Russia
  • 7University of Potsdam, Institute of Biochemistry and Biology, 14476 Potsdam-Golm, Germany

Abstract. Mosses are a major component of the arctic vegetation, particularly in wetlands. We present C ∕ N atomic ratio, δ13C and δ15N data of 400 brown-moss samples belonging to 10 species that were collected along hydrological gradients within polygonal mires located on the southern Taymyr Peninsula and the Lena River delta in northern Siberia. Additionally, n-alkane patterns of six of these species (16 samples) were investigated. The aim of the study is to see whether the inter- and intraspecific differences in C ∕ N, isotopic compositions and n-alkanes are indicative of habitat, particularly with respect to water level. Overall, we find high variability in all investigated parameters for two different moisture-related groups of moss species. The C ∕ N ratios range between 11 and 53 (median: 32) and show large variations at the intraspecific level. However, species preferring a dry habitat (xero-mesophilic mosses) show higher C ∕ N ratios than those preferring a wet habitat (meso-hygrophilic mosses). The δ13C values range between −37.0 and −22.5 ‰ (median  =  −27.8 ‰). The δ15N values range between −6.6 and +1.7 ‰ (median  =  −2.2 ‰). We find differences in δ13C and δ15N compositions between both habitat types. For some species of the meso-hygrophilic group, we suggest that a relationship between the individual habitat water level and isotopic composition can be inferred as a function of microbial symbiosis. The n-alkane distribution also shows differences primarily between xero-mesophilic and meso-hygrophilic mosses, i.e. having a dominance of n-alkanes with long (n-C29, n-C31) and intermediate (n-C25) chain lengths, respectively. Overall, our results reveal that C ∕ N ratios, isotopic signals and n-alkanes of studied brown-moss taxa from polygonal wetlands are characteristic of their habitat.

Short summary
We investigated variations of isotopic and biochemical parameters in arctic mosses. We were able to differentiate habitat groups of mosses (classified by moisture gradient) by elemental content and isotopic ratios (δ13C, δ15N). Some species showed intraspecific variability in their isotopic composition along the moisture gradient. Furthermore n-alkanes showed interesting patterns for species identification.
Final-revised paper