气候变化领域集成服务门户(CCPortal): Late Pleistocene and Late Holocene environment and climate in the campos region of southeastern South America inferred from phytolith; diatom and geochemical data

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DOI	10.1016/j.palaeo.2020.109586
	Late Pleistocene and Late Holocene environment and climate in the campos region of southeastern South America inferred from phytolith; diatom and geochemical data
	Mourelle D.; del Puerto L.; Perez L.; Bergamino L.; García-Rodríguez F.
发表日期	2020
ISSN	0031-0182
卷号	543
英文摘要	A paleolimnological study was undertaken for a sediment core from Laguna Formosa, a subtropical lake in the northern campos inland region of Uruguay. The record encompasses a Late Pleistocene and Late Holocene interval, interrupted by a hiatus. We analyzed (1) opal phytoliths and diatoms to infer the regional environment, climate, and changes in lake trophic state, and (2) total carbon and nitrogen (TC and TN) and stable isotope data (δ13C and δ15N) to infer organic matter sources and composition. Findings indicate that, in Late Pleistocene times, a cool, semi-arid or highly seasonal climate existed, with a dominance of C3 grasslands and riparian hydrophilous shrublands while the shallow freshwater environment was characterized by benthic diatoms and littoral macrophytes. Late Holocene times were initially characterized by a temperate and humid or sub-humid climate, and dominance of grasslands and bunch grasses, while Laguna Formosa was dominated by phytoplankton. The abundance and diversity of littoral hydrophilic vegetation, and riparian forest vegetation, increased progressively over time, as a result of increased rainfall, from ca. 1800 cal yr BP and the onset of a subtropical (temperate and humid) climate by ca. 1300 cal yr BP. Such inferences are in close agreement with an earlier palynological study of Laguna Formosa, and support the paleoclimatic models for the Late Pleistocene and Late Holocene of southeastern South America. © 2020
英文关键词	campos region; Diatoms; Opal phytoliths; Rio de la Plata grassland; δ13C; δ15N
语种	英语
scopus关键词	abundance; diatom; freshwater environment; geochemistry; Holocene; organic matter; phytolith; riparian forest; sediment core; stable isotope; Argentina; Formosa [Argentina]; Uruguay; Bacillariophyta; Poaceae
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/150596
作者单位	Universidad de la República, Centro Universitario Regional Este, Rocha, Uruguay; Universidade Federal do Rio Grande, Instituto de Oceanografia, Programa de Pós-Graduação em Oceanología, Rio Grande, Brazil
推荐引用方式 GB/T 7714	Mourelle D.,del Puerto L.,Perez L.,et al. Late Pleistocene and Late Holocene environment and climate in the campos region of southeastern South America inferred from phytolith; diatom and geochemical data[J],2020,543.
APA	Mourelle D.,del Puerto L.,Perez L.,Bergamino L.,&García-Rodríguez F..(2020).Late Pleistocene and Late Holocene environment and climate in the campos region of southeastern South America inferred from phytolith; diatom and geochemical data.Palaeogeography, Palaeoclimatology, Palaeoecology,543.
MLA	Mourelle D.,et al."Late Pleistocene and Late Holocene environment and climate in the campos region of southeastern South America inferred from phytolith; diatom and geochemical data".Palaeogeography, Palaeoclimatology, Palaeoecology 543(2020).