Global extent and drivers of mammal population declines in protected areas under illegal hunting pressure.

PLoS One · 2020 · PMC7446782 · PMID 32822346

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an increasing trendno p-value reported

There was an increasing trend in research on illegal hunting in PAs with the number of publications increasing two-fold each decade since 1980.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.