Fossil pollen as a record of past biodiversity
Fossil pollen as a record of past biodiversity
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DOI：
10.1046/j.1365-2699.1999.00280.x
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发表时间：
1999-01
影响因子：
3.9
通讯作者：
B. Odgaard
中科院分区：
文献类型：
--
作者：
B. Odgaard
第四纪花粉记录可能对了解现代植物多样性有独特的贡献。花粉组合可以反映群落和景观尺度的多样性，但大多数研究的时间分辨率与现代生态学研究的时间分辨率不匹配。由于花粉生产力和传播差异的复杂影响，花粉记录不能直接反映植被多样性的公平性方面。植被多样性指数比其他S（类群总数），因此不适合花粉组合。作为衡量物种丰富度的孢粉学丰富度是有偏见的缺乏分类精度，花粉传播植被结构和花粉代表性的可能干扰。物种丰富度和花粉类群丰富度之间的非线性关系可以用来尝试从化石花粉组合中估计过去的植物区系丰富度。使用一个假设的例子，植被覆盖变化的强烈影响，影响类群与不同的代表性（Rrel）值上观察到的孢粉丰富性。有人建议，相对花粉生产力的估计应用于指导花粉的总和，花粉类型的丰富度估计稀疏技术，这种方法是说明使用晚全新世多样性动态的配对现场研究。需要一个现代的训练集花粉类型丰富度的物种丰富度，花粉生产力和植被结构的强调。
Quaternary pollen records may contribute uniquely to the understanding of present plant diversity. Pollen assemblages can reflect diversity at community and landscape scales but the time resolution of most studies does not match that of modern ecological studies. Because of the complicating effects of differential pollen productivity and dispersal, pollen records do not directly reflect equitability aspects of vegetation diversity. Vegetation diversity indices other than S (the total number of taxa) are therefore not appropriate for pollen assemblages. As a measure of the species richness palynological richness is biased by the lack of taxonomic precision, by a possible interference on pollen dispersal from vegetation structure and by pollen representation. The nonlinear relationship between species richness and pollen‐taxa richness may be used in attempts to estimate past floristic richness from fossil pollen assemblages. Using a hypothetical example the strong effect of cover shifts in the vegetation affecting taxa with different representation (Rrel) values on observed palynological richness is demonstrated. It is suggested that estimates of relative pollen productivity should be used to guide the pollen sum on which pollen‐type richness is estimated by rarefaction techniques and this approach is illustrated using a paired site study of late Holocene diversity dynamics. The need for a modern training set relating pollen‐type richness to species richness, pollen productivity and vegetation structure is emphasized.