Declining water depth delayed the breeding time of Fulica atra, not human disturbance.

PLoS One · 2018 · PMC6114854 · PMID 30157235

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a decreasing trendno p-value reported

The productivity of coots showed a decreasing trend with later breeding dates; however, this trend was significantly supported in only the Longfeng wetland.

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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.