Monolingual searches can limit and bias results in global literature reviews

Nuñez, M.A. and Amano, T. (2021) Nature Ecology & Evolution.

A perspective article recently published in Nature Ecology & Evolution (Haddaway et al 2020) nicely reviews various problems with ecological literature reviews and provides methodological solutions to address those problems. Nevertheless, we found that a key issue was not covered by the perspective article – the need to search and analyse literature published in languages other than English. In this correspondence article, we elaborate how ignoring non-English-language literature could bias conclusions of (especially global) evidence syntheses, and propose some potential solutions to properly incorporate non-English-language literature in future literature reviews.

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