气候变化领域集成服务门户(CCPortal): Paleoclimate and paleoecology of the latest Eocene Florissant flora of central Colorado; U.S.A.

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DOI	10.1016/j.palaeo.2020.109678
	Paleoclimate and paleoecology of the latest Eocene Florissant flora of central Colorado; U.S.A.
	Allen S.E.; Lowe A.J.; Peppe D.J.; Meyer H.W.
发表日期	2020
ISSN	0031-0182
卷号	551
英文摘要	The uppermost Eocene Florissant Formation of central Colorado, U.S.A. contains a diverse flora and fauna preserved in lacustrine facies and represents a key episode in Earth history immediately preceding the Eocene-Oligocene boundary. Laminated shales contain impressions of non-monocot angiosperm leaves that were used to estimate paleoecological and paleoclimatic parameters using leaf physiognomic methods including: leaf mass per area (MA), digital leaf physiognomy (DiLP), leaf margin analysis (LMA), and leaf area analysis (LAA). The majority (58%) of the morphotypes analyzed for MA suggested a semi-evergreen leaf lifespan, whereas another 27% indicated a deciduous habit and 15% an evergreen habit. There was no significant relationship between MA and insect damage based on a small subset of Florissant's leaves. Higher MA values (~73% of leaves ≥ one-year lifespan), coupled with a tendency toward long and narrow leaf shapes and small leaf areas, indicate the existence of sclerophyllous vegetation. Using the global regression for mean annual temperature (MAT), the DiLP estimate of MAT was anomalously cold: 5.5 ± 4 °C. However, using a Northern Hemisphere regression the DiLP MAT estimate of 11.6 ± 3.3 °C was more plausible. Using DiLP, mean annual precipitation (MAP) was estimated at 740 + 608/−334 mm∙yr−1, which supports dry conditions. Estimates for MAT and MAP using the univariate LMA and LAA methods overlapped within uncertainty of the DiLP results. In addition, those taxa classified as growing in wet areas (riparian) had significantly more teeth than non-riparian taxa. These paleoclimatic and paleoecological results suggest that outside the riparian forest, the Florissant flora sampled a seasonally dry temperate sclerophyllous shrubland to woodland, perhaps similar to modern chaparral forests, in the western interior of the U.S.A. just before the transition into the cooler Oligocene. © 2020 Elsevier B.V.
英文关键词	Digital leaf physiognomy; Leaf area analysis; Leaf margin analysis; Leaf mass per area; Leaf physiognomy; Paleobotany
语种	英语
scopus关键词	angiosperm; deciduous tree; Eocene-Oligocene boundary; flora; fossil record; leaf area; lithofacies; macrophyte; paleobotany; paleoecology; paleoenvironment; shrubland; Colorado; United States; Hexapoda; Magnoliophyta
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/150474
作者单位	Department of Biology, Penn State Altoona, 3000 Ivyside Park, Altoona, PA 16601, United States; Department of Biology, University of Washington, 24 Kincaid Hall, Seattle, WA 98195, United States; Terrestrial Paleoclimatology Research Group, Department of Geosciences, Baylor University, Waco, TX 76706, United States; National Park Service, Florissant Fossil Beds National Monument, P.O. Box 185, Florissant, CO 80816, United States
推荐引用方式 GB/T 7714	Allen S.E.,Lowe A.J.,Peppe D.J.,et al. Paleoclimate and paleoecology of the latest Eocene Florissant flora of central Colorado; U.S.A.[J],2020,551.
APA	Allen S.E.,Lowe A.J.,Peppe D.J.,&Meyer H.W..(2020).Paleoclimate and paleoecology of the latest Eocene Florissant flora of central Colorado; U.S.A..Palaeogeography, Palaeoclimatology, Palaeoecology,551.
MLA	Allen S.E.,et al."Paleoclimate and paleoecology of the latest Eocene Florissant flora of central Colorado; U.S.A.".Palaeogeography, Palaeoclimatology, Palaeoecology 551(2020).