This research investigates how the alga Epithemia sustains productivity in California's Eel River by fixing atmospheric nitrogen. Using stable isotope analysis, it shows that Epithemia supplies almost all the nitrogen supporting algal growth, revealing a critical ecological process underpinning river food webs and the conservation of salmon ecosystems.

Feathers and blood preserve detailed biological records of Tītī stress, diet, and environment across both New Zealand and the North Pacific. By analysing hormones and stable isotopes in modern and historical samples, this research reveals how climate change affects Tītī populations and identifies which groups are most vulnerable, guiding future conservation efforts.