Natural isotopic composition of carbon (delta C-13) correlates with colony size in the planktonic cyanobacterium Gloeotrichia echinulata
2009 (English)In: Limnology and Oceanography, ISSN 0024-3590, Vol. 54, no 3, 925-929 p.Article in journal (Refereed) Published
To assess variability in carbon isotope signatures (delta C-13) between and within populations under natural conditions, with a particular emphasis on colony size, we repeatedly collected planktonic colonies of a freshwater cyanobacterium Gloeotrichia echinulata in two lakes, Pyhajarvi (southwest Finland) and Erken (southeast Sweden). Despite substantial differences in the average delta C-13 signature of Gloeotrichia between lakes (-6.9 parts per thousand in Pyhajarvi and -20.7 parts per thousand in Erken), a similar, systematic increase in delta C-13 with colony size was observed in both lakes (of 2-3 parts per thousand in Pyhajarvi and 3-5 parts per thousand in Erken). This suggests declining isotope fractionation with increasing colony size, probably related to diffusion limitation of carbon availability. Temporal variation explained a minor fraction of total subsample variability (range delta C-13 similar to 4 parts per thousand in Pyhajarvi and similar to 6 parts per thousand in Erken). Isotopic C-13 fractionation in Gloeotrichia was likely affected both by carbon source and by colony size.
Place, publisher, year, edition, pages
2009. Vol. 54, no 3, 925-929 p.
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-36968DOI: 10.4319/lo.2009.54.3.0925ISI: 000268325000024OAI: oai:DiVA.org:su-36968DiVA: diva2:291453