气候变化领域集成服务门户(CCPortal): Uplands; lowlands; and climate: Taphonomic megabiases and the apparent rise of a xeromorphic; drought-tolerant flora during the Pennsylvanian-Permian transition

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DOI	10.1016/j.palaeo.2020.109965
	Uplands; lowlands; and climate: Taphonomic megabiases and the apparent rise of a xeromorphic; drought-tolerant flora during the Pennsylvanian-Permian transition
	DiMichele W.A.; Bashforth A.R.; Falcon-Lang H.J.; Lucas S.G.
发表日期	2020
ISSN	0031-0182
卷号	559
英文摘要	The Late Mississippian and Pennsylvanian have been referred to as the Coal Age due to enormous paleotropical peat accumulations (coal beds). Numerous fossil floras have been collected from these coals, and their associated seat-earth paleosols and roof-shales, over more than two centuries, leading to the inference of vast swampy wetlands covering the Pangean tropics during the Pennsylvanian. In contrast, the Permian tropics are characterized as more arid, with sparser and more heterogeneous vegetation than inferred for the Pennsylvanian. In the tropics, the Pennsylvanian to Permian transition has been described as a changeover from a pteridophyte-dominated “Paleophytic flora”, to a seed-plant dominated “Mesophytic flora. This view notwithstanding, floras dominated by xeromorphic seed plants also are well known from the Pennsylvanian tropics. Some authors have characterized these plants as being occupants of uplands, subsequently transported into basinal-lowland, preservational environments. In this model, uplands are well drained, causing areas of drought under otherwise everwet climates. In this paper, we present an alternative interpretation: that the apparent transition in Pennsylvanian-Permian tropical vegetation reflects two types of taphonomic megabias. First is a preservational megabias, strongly favoring the vegetation of humid climates over that of seasonally dry climates. Accordingly, tropical-plant preservational potential fluctuated in concert with Late Paleozoic Ice Age glacial-interglacial oscillations, and contemporaneous sea-level and climatic changes. Second is an analytical megabias, strongly favoring the discovery and collection of the wetland biome from Pennsylvanian strata, overlooking the less frequently and more poorly preserved drought-tolerant biome. By Permian times, vast wetlands, and their fossil record, had largely disappeared from central Pangea (although continuing in Cathaysia), making drought-tolerant vegetation more “visible” to searchers, without changing its preservational circumstances. We demonstrate that the upland model is untenable, being inconsistent with the principles of plant biogeography and with geological aspects of the fossil record. © 2020
英文关键词	Dryland; Late Paleozoic; Mesophytic; Paleophytic; Wetland
语种	英语
scopus关键词	biogeography; climate change; drought stress; flora; fossil record; glacial-interglacial cycle; Pangaea; Pleistocene; sea level change; taphonomy; wetland; Pennsylvania; United States; Pteridophyta; Spermatophyta
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150333
作者单位	Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC, 20560, United States; Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, Copenhagen K, 1350, Denmark; Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, United Kingdom; New Mexico Museum of Natural History and Science, Albuquerque, NM 87104, United States
推荐引用方式 GB/T 7714	DiMichele W.A.,Bashforth A.R.,Falcon-Lang H.J.,et al. Uplands; lowlands; and climate: Taphonomic megabiases and the apparent rise of a xeromorphic; drought-tolerant flora during the Pennsylvanian-Permian transition[J],2020,559.
APA	DiMichele W.A.,Bashforth A.R.,Falcon-Lang H.J.,&Lucas S.G..(2020).Uplands; lowlands; and climate: Taphonomic megabiases and the apparent rise of a xeromorphic; drought-tolerant flora during the Pennsylvanian-Permian transition.Palaeogeography, Palaeoclimatology, Palaeoecology,559.
MLA	DiMichele W.A.,et al."Uplands; lowlands; and climate: Taphonomic megabiases and the apparent rise of a xeromorphic; drought-tolerant flora during the Pennsylvanian-Permian transition".Palaeogeography, Palaeoclimatology, Palaeoecology 559(2020).