Fig 7. Stable carbon and nitrogen values for Keen’s mice, dusky shrews and the potential foods.

Values of δ¹³C and δ¹⁵N (average ± 95% confidence intervals) for blood and muscle tissues of Keen’s mice and dusky shrews captured on Prince of Wales Island, Alaska 2010–2012. Potential diet items were corrected for consumer-diet discrimination by using a trophic enrichment factor of 1.3‰ for δ¹³C and 2.5‰ for δ¹⁵N in relation to shrew diets.