Experimental d13C evidence for a contribution of methane to pelagic food webs in lakes

By P. Kankaala, S. Taipale, Jonathan Grey, E. Sonninen, L. Arvola, Roger I. Jones. 2006

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Fatty acid composition as biomarkers of freshwater microalgae: analysis of 37 strains of microalgae in 22 genera and in seven classes (2013, background): “These very depleted δ13C values have been found in zooplankton as well (Kankaala et al. 2006).”
Seasonal shifts between autochthonous and allochthonous carbon contributions to zooplankton diets in a subarctic lake (2011, background): “Differences in the isotopic signal between allochthonous and autochthonous carbon (Grey et al. 2001), and between autotrophic and heterotrophic food sources (Kankaala et al. 2006), have been used to trace the source and flow of carbon from one system and trophic level to another in the food web.”
Comparison of methods to determine algal δ13C in freshwater (2008, background): “Previous studies have reported on the importance of methane-oxidizing bacteria as a source of isotopically light carbon (Kankaala et al. 2006), but such a source is unlikely to affect the results of this study, since anoxia was not observed in the water columns at our sites.”