An ornithologist uses stable isotope analysis to determine that a bird’s tissue sample contains a δ¹³C value of -18.5‰, which is a weighted average of two food sources: insects (δ¹³C = -22‰) and fruits (δ¹³C = -14‰). What fraction of the bird’s diet consists of insects?

Mon, 20 Apr 2026 04:24:33 +0000

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