Alexandra Auderset
Alexandra Auderset
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Nitrogen and carbon isotope ecology

Foraminifera-bound nitrogen isotopes to detect past symbiotic relationships

In this study we show the potential of using  FB-δ15N to detect photosymbiosis in modern and fossil foraminifera. Due to distinct isotopic signatures related to ammonium recycling, FB-δ15N can distinguish between foraminifera with dinoflagellate-symbionts, non-dinoflagellate symbionts and non-symbiotic foraminifera. However, we also point out that in  regions with strong oceanographic gradients the application of FB-δ15N could be complicated. 

Explore different archives

So far, there are studies on fossil-bound δ15N in corals, diatoms, otholiths,  and teeth (shark, mammal, dinosaur, hominin). In future studies I aim to apply this method to further organisms and geological archives. Together with collaborator Jeffrey Thompson we currently work on modern and Carboniferous sea urchins/echinoids. Other collaborations involve Adriane Lam and Mesozoic ecosystems, and Hana Jurikova and brachiopods.


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