Fern spore viability considered in relation to the duration of the Cretaceous-Paleogene (K-Pg) impact winter. A contribution to the discussion

Q2 Agricultural and Biological Sciences
K. Berry
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引用次数: 4

Abstract

Abstract The Cretaceous-Paleogene (K-Pg) boundary Chicxulub impact is supposed to have produced a nearly decade-long impact winter which resulted in a mass-extinction event among dicot angiosperms but which left pteridophytes comparatively unaffected. Dicot angiosperms subsequently recovered from the soil seed bank following an episode of global deforestation, although this recovery took centuries. Pteridophytes, on the other hand, are supposed to have recovered within months of the impact event, due to the characteristic, short-term viability of fern spores in the soil bank – an interpretation consistent with the assumption that the dominant fern spore at the K-Pg boundary fern spore spike, Cyathidites Couper, was produced by cyatheaceous foliage. At the K-Pg boundary section near Sugarite, New Mexico, however, Cyathidites spores are more likely to have been produced by schizaeaceous foliage, which produces spores capable of germinating after spending about a decade or more in the soil and which already commanded similar depositional settings in western North America during the Maastrichtian. Therefore, the protracted – millennial – timescale for fern dominance in the earliest Danian could be related to the unique ecology of schizaeaceous ferns that recovered from a persistent spore bank in a habitat that they already dominated, presumably by suppressing the colonization of angiosperms.
蕨类植物孢子活力与白垩纪-古近纪(K-Pg)影响冬季的持续时间有关。对讨论的贡献
白垩纪-古近纪(K-Pg)边界Chicxulub撞击被认为产生了一个长达近十年的撞击冬季,导致双科被子植物的大规模灭绝事件,而蕨类植物相对未受影响。在全球森林砍伐之后,双叶被子植物随后从土壤种子库中恢复,尽管这种恢复花了几个世纪。另一方面,由于蕨类孢子在土壤库中的短期生存能力,蕨类植物应该在撞击事件发生后的几个月内恢复过来——这一解释与K-Pg边界蕨类孢子穗上的优势蕨类孢子Cyathidites Couper是由cyatheaceous叶子产生的假设一致。然而,在新墨西哥州Sugarite附近的K-Pg边界部分,Cyathidites孢子更有可能是由裂叶类叶子产生的,这种叶子在土壤中生长大约十年或更长时间后产生的孢子能够发芽,并且在马斯垂克时期在北美西部已经有类似的沉积环境。因此,在大年代早期,蕨类植物的优势地位持续了数千年,这可能与分裂类蕨类植物的独特生态有关,这些蕨类植物从它们已经占据主导地位的栖息地的持久孢子库中恢复过来,可能是通过抑制被子植物的定植。
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来源期刊
Acta Palaeobotanica
Acta Palaeobotanica Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)
CiteScore
1.60
自引率
0.00%
发文量
5
审稿时长
20 weeks
期刊介绍: Acta Palaeobotanica is an international journal edited in English by the W. Szafer Institute of Botany, Polish Academy of Sciences, Kraków, since 1960, which publishes original palaeobotanical, palynological, palaeoecological and palaeophytogeographical papers, monographs, review and discussion articles and book reviews. It is the only journal in the Central and Eastern Europe publishing papers from all fields of palaeobotany. The journal is published regularly in one volume per year, with two numbers.
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