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Linear regressions of δ13C (left) and δ15N (right) between muscle and fin in (a) anuran tadpoles and (b) newt adults. Empty circles on a dotted line represent the European tree frog, full circles on a dashed line the agile frog, empty squares on a dotted line and full squares on a dashed line the palmate newt and marbled newts, respectively. Plain lines represent y = x.
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