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We explored δ 15 N compound-specific amino acid isotope data (CSI-AA) in filter-feeding intertidal mussels ( Mytilus californianus ) as a new approach to construct integrated isoscapes of coastal primary production. We examined spatial δ 15 N gradients in the California Upwelling Ecosystem (CUE), determining bulk δ 15 N values of mussel tissue from 28 sites between Port Orford, Oregon and La Jolla, California, and applying CSI-AA at selected sites to decouple trophic effects from isotopic values at the base of the food web. Bulk δ 15 N values showed a strong linear trend with latitude, increasing from North to South (from ∼7‰ to ∼12‰, R 2  = 0.759). In contrast, CSI-AA trophic position estimates showed no correlation with latitude. The δ 15 N trend is therefore most consistent with a baseline δ 15 N gradient, likely due to the mixing of two source waters: low δ 15 N nitrate from the southward flowing surface California Current, and the northward transport of the California Undercurrent (CUC), with 15 N-enriched nitrate. This interpretation is strongly supported by a similar linear gradient in δ 15 N values of phenylalanine (δ 15 N Phe ), the best AA proxy for baseline δ 15 N values. We hypothesize δ 15 N Phe  values in intertidal mussels can approximate annual integrated δ 15 N values of coastal phytoplankton primary production. We therefore used δ 15 N Phe  values to generate the first compound-specific nitrogen isoscape for the coastal Northeast Pacific, which indicates a remarkably linear gradient in coastal primary production δ 15 N values. We propose that δ 15 N Phe  isoscapes derived from filter feeders can directly characterize baseline δ 15 N values across major biochemical provinces, with potential applications for understanding migratory and feeding patterns of top predators, monitoring effects of climate change, and study of paleo- archives.

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Compound-Specific δ15N Amino Acid Measurements in Littoral Mussels in the California Upwelling Ecosystem: A New Approach to Generating Baseline δ15N Isoscapes for Coastal Ecosystems