Resource partitioning by sympatric Steller sea lions and northern fur seals as revealed by biochemical dietary analyses and satellite telemetry

► We examine the diets of sympatric Steller sea lions and northern fur seals. ► Stable isotopes and fatty acids indicate significant dietary differences. ► Telemetry and stable isotopes indicate foraging grounds are spatially partitioned. ► Partitioning of forage resources may reduce inter-specific competition for prey. ► Differences may reflect adult provisioning strategies and pup fasting abilities.