Exploring holocene changes in palynological richness in northern Europe--did postglacial immigration matter?

PLoS One · 2012 · PMC3519870 · PMID 23240048

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a negative trendno p-value reported

Peros and Gajewski [41] find a positive correlation between palynological richness and evenness and a negative trend for palynological richness and pollen concentration in a surface sample dataset from the Canadian arctic.

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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.