Abundance–diversity relationship as a unique signature of temporal scaling in the fossil record,Ecology Letters

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Abundance–diversity relationship as a unique signature of temporal scaling in the fossil record
Ecology Letters ( IF 7.6 ) Pub Date : 2024-07-11 , DOI: 10.1111/ele.14470
Adam Tomašových ₁ , Michał Kowalewski ₂ , Rafał Nawrot ₃ , Daniele Scarponi ₄ , Martin Zuschin ₃

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Species diversity increases with the temporal grain of samples according to the species–time relationship (STR), impacting palaeoecological analyses because the temporal grain (time averaging) of fossil assemblages varies by several orders of magnitude. We predict a positive relation between total abundance and sample size‐independent diversity (ADR) in fossil assemblages because an increase in time averaging, determined by a decreasing sediment accumulation, should increase abundance and depress species dominance. We demonstrate that, in contrast to negative ADR of non‐averaged living assemblages, the ADR of Holocene fossil assemblages is positive, unconditionally or when conditioned on the energy availability gradient. However, the positive fossil ADR disappears when conditioned on sediment accumulation, demonstrating that ADR is a signature of diversity scaling induced by variable time averaging. Conditioning ADR on sediment accumulation can identify and remove the scaling effect caused by time averaging, providing an avenue for unbiased biodiversity comparisons across space and time.

中文翻译：

丰度-多样性关系作为化石记录中时间尺度的独特特征

根据物种-时间关系（STR），物种多样性随着样本的时间颗粒而增加，影响古生态学分析，因为化石组合的时间颗粒（时间平均）变化几个数量级。我们预测化石组合中的总丰度与样本大小无关的多样性（ADR）之间存在正相关关系，因为由沉积物积累的减少决定的时间平均的增加应该会增加丰度并抑制物种优势。我们证明，与非平均生物组合的负 ADR 相比，全新世化石组合的 ADR 是正的，无条件地或以能源可用性梯度为条件时。然而，当以沉积物积累为条件时，正化石 ADR 消失，这表明 ADR 是由可变时间平均引起的多样性缩放的特征。以沉积物积累为条件的 ADR 可以识别并消除时间平均引起的缩放效应，为跨空间和时间的无偏见生物多样性比较提供途径。

更新日期：2024-07-11

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