Fatty acid profiling is a widely used tool in cetacean dietary and health assessments, yet most studies focus exclusively on blubber, overlooking the epidermis – the largest organ and primary barrier against environmental stressors – which remains largely uncharacterised, despite its accessibility for sampling of live and deceased animals. Here, we present a comparative analysis of fatty acid composition across the epidermis a...

We used 15 NH 4 tracer additions to determine travel distances of ammonium (NH4 ) and suspended particulate organic nitrogen (SPON) in six streams ranging from second to fifth order located within a single watershed on the North Slope of Alaska. Based on the distribution of 15 N stored in stream bottom compartments (primary producers or grazers), we estimated NH 4 travel lengths. We used a two‐compartment model to estimate the...