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首页> 外文期刊>Journal of quaternary science: JQS >Identifying the pollen of an extinct spruce species in the Late Quaternary sediments of the Tunica Hills region, south-eastern United States
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Identifying the pollen of an extinct spruce species in the Late Quaternary sediments of the Tunica Hills region, south-eastern United States

机译：识别美国东南部丘尼卡山地区第四纪晚期沉积物中一种已灭绝的云杉物种的花粉

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摘要

Late Quaternary fluvial deposits in the Tunica Hills region of Louisiana and Mississippi are rich in spruce macrofossils of the extinct species Picea critchfieldii, the one recognized plant extinction of the Late Quaternary. However, the morphology of P. critchfieldii pollen is unknown, presenting a barrier to the interpretation of pollen spectra from the last glacial of North America. To address this issue, we undertook a morphometric study of Picea pollen from Tunica Hills. Morphometric data, together with qualitative observations of pollen morphology using Apotome fluorescence microscopy, indicate that Picea pollen from Tunica Hills is morphologically distinct from the pollen of P. glauca, P. mariana and P. rubens. Measurements of grain length, corpus width and corpus height indicate that Picea pollen from Tunica Hills is larger than the pollen of P. mariana and P. rubens, and is slightly larger than P. glauca pollen. We argue that the morphologically distinctive Tunica Hills Picea pollen was probably produced by the extinct spruce species P. critchfieldii. These morphological differences could be used to identify P. critchfieldii in existing and newly collected pollen records, which would refine its paleoecologic and biogeographic history and clarify the nature and timing of its extinction in the Late Quaternary.
机译：路易斯安那州和密西西比州的丘尼卡丘陵地区的第四纪晚期河床沉积物富含云杉的化石云杉化石，该云杉化石是已灭绝的第四纪云杉（Picea critchfieldii）灭绝的一种植物。然而，P。critchfieldii花粉的形态是未知的，这为解释来自北美最后冰川的花粉光谱提供了障碍。为了解决这个问题，我们对Tunica Hills的Picea花粉进行了形态计量学研究。形态学数据以及使用Apotome荧光显微镜对花粉形态的定性观察表明，来自Tunica Hills的Picea花粉在形态上与P. glauca，P。mariana和P. rubens的花粉截然不同。谷物长度、,体宽度和体高度的测量结果表明，来自Tunica Hills的云杉花粉比P. mariana和P. rubens的花粉大，并且比P. glauca花粉略大。我们认为形态独特的Tunica Hills Picea花粉可能是由已灭绝的云杉物种P. critchfieldii产生的。这些形态上的差异可用于识别现有和新收集的花粉记录中的克里氏疟原虫，这将完善其古生态和生物地理历史，并阐明其在第四纪晚期的灭绝性质和时间。

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