Isotope values of the rodent species along mast cycles.

<p>Mean (± S.E.) δ¹⁵N and δ¹³C values for bank voles (grey symbols) and yellow-necked mice (black symbols) in mast, post-mast and intermediate years. Also shown are positions animals would occupy if they had exclusive diets of deciduous forest herb vegetation and mast seeds (oak, hornbeam, lime, spruce).