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Sharp differences in the delta super(13)C values of organic matter and carbonate encrustations but not in ambient water DIC between two morphologically distinct charophytes
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Sharp differences in the delta super(13)C values of organic matter and carbonate encrustations but not in ambient water DIC between two morphologically distinct charophytes
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Sharp differences in the delta super(13)C values of organic matter and carbonate encrustations but not in ambient water DIC between two morphologically distinct charophytes
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Journal Article
Sharp differences in the delta super(13)C values of organic matter and carbonate encrustations but not in ambient water DIC between two morphologically distinct charophytes
2016
Overview
The stable carbon isotope composition of the carbonate encrustations ( delta super(13)C sub(CARB)) , organic matter ( delta super(13)C sub(ORG)) and the dissolved inorganic carbon ( delta super(13)C sub(DIC)) in the ambient lake waters were analysed for two common but morphologically different and, thus, representing different growth forms of Chara species. We hypothesized that the relationships between delta super(13)C sub(CARB), delta super(13)C sub(ORG) and delta super(13)C sub(DIC) are species specific and related to the different growth forms of the studied charophytes. For each species (Chara tomentosa and Chara globularis), 10 individuals and water samples from above the macrophytes were collected in five lakes at three sites per lake in mid-summer. Opposing shifts were found between delta super(13)C sub(CARB) and delta super(13)C sub(DIC) values with super(13)C enrichment in C. tomentosa and super(13)C depletion in C. globularis. In addition, C. globularis exhibited more negative values of delta super(13)C sub(ORG) than C. tomentosa, even under similar conditions. The delta super(13)C sub(CARB) and delta super(13)C sub(ORG) values were positively correlated in both species, but delta super(13)C sub(CARB) and delta super(13)C sub(DIC) as well as delta super(13)C sub(ORG) and delta super(13)C sub(DIC) were positively correlated in C. tomentosa only. The differences found result from the different proportions between super(13)C and super(12)C in DIC used as a CO sub(2) source for photosynthesis, which is linked to the different growth forms represented by the two studied charophytes and, thus, are species specific as we hypothesized.
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