![]() ![]() Amongst the phytoplankton, the isotopic difference between biomarker fatty acids and bulk biomass averaged -10.7☑.1‰ for Chlorophyceae and Cyanophyceae, and -6.1☑.7‰ for Cryptophyceae, Chrysophyceae and Diatomophyceae. ![]() Our measurements revealed that the δ 13C values of lipids followed phylogenetic classification among phytoplankton (78.2% of variance was explained by class), bacteria and terrestrial matter, and there was a strong correlation between the δ 13C values of total lipids, phospholipids and individual fatty acids. The lipid content was higher amongst the phytoplankton (9.5±4.0%) than bacteria (7.3☐.8%) or terrestrial matter (3.9☑.7%). We determined the δ 13C values of lipids, phospholipids and biomarker fatty acids and used these to calculate isotopic differences compared to the whole-cell δ 13C values for eight phytoplankton classes, five bacterial taxa, and three types of terrestrial organic matter (two trees and one grass). Hence there is a critical need for improved methods for estimating the δ 13C ratios of phytoplankton, bacteria and terrestrial detritus from within mixed seston. Stable isotope mixing models in aquatic ecology require δ 13C values for food web end members such as phytoplankton and bacteria, however it is rarely possible to measure these directly. ![]()
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