Amplitude of circadian rhythms becomes weaken in the north, but there is no cline in the period of rhythm in a beetle.

PLoS One · 2021 · PMC7808652 · PMID 33444354

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a negative trendno p-value reported

L203 see my comments about similar text within the introduction L206 what does "this negative trend seemed to be unclear" mean? A negative trend wasn't observed?

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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.