干旱区生态环境知识资源中心(Arid): Diverse evidence for grasslands since the Eocene in Patagonia

Arid

DOI	10.1016/j.jsames.2021.103357
	Diverse evidence for grasslands since the Eocene in Patagonia
	Bellosi, Eduardo; Genise, Jorge F.; Zucol, Alejandro; Bond, Mariano; Kramarz, Alejandro; Sanchez, M. Victoria; Krause, J. Marcelo
通讯作者	Bellosi, E (corresponding author), Consejo Nacl Invest Cient & Tecn, Museo Argentino Ciencias Natur, Buenos Aires, DF, Argentina.
来源期刊	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN	0895-9811
EISSN	1873-0647
出版年	2021
卷号	108
英文摘要	Timing and ecological steps of the rise and expansion of grasslands differ not only geographically but also according to the type of available information. Patagonia (Argentina) was largely considered the region where grasslands and grazers early evolved in the Eocene, mostly based on functional morphology of mammals. However, recent paleobotanical studies question this traditional view and maintain that this occurred after early Miocene. To tackle this discrepancy, we conduct a multidisciplinary and integrative approach using diverse lines of evidence obtained from middle Eocene - middle Miocene tuffaceous deposits of central and northern Patagonia. Gathered data correspond to sedimentary facies, paleosols, insect trace fossils, opal phytoliths and fossil mammals (tooth morphology, body size). Long-lasting and frequent volcanic ashfalls caused permanent disturbances in physical scenarios, biotic systems and grassy habitats; just like herbivory of mammals through coevolutionary grass-grazer mechanisms. The results indicate that soils, vegetation, insects and mammal herbivores begun synchronously to record diverse traits related to grasslands showing mosaic vegetation since middle Eocene (similar to 44 Ma). These traits include mollic paleosols, abundant and persistent dung beetle trace fossils (Coprinisphaera ichnofacies), phytolith assemblages attributable to savannas and medium to large-size hypsodont mammals. We also track the evolutionary history after the reduction of closed forests, recognizing alternating subhumid savannas with riparian forests, where the relative frequency between grasses, palms, trees and shrubs fluctuated in time and space; and desert vegetation (shrublands) dominated by palms and shrubs during dryer periods. The advent and expansion of grasslands can be linked to the cooling and drying period subsequent to the Early Eocene Climate Optimum.
英文关键词	Grassland evolution Paleosols Trace fossils Phytoliths Mammal hypsodonty
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000663416400003
WOS关键词	DUNG-BEETLE ; DINOSAUR COPROLITES ; PINTURAS FORMATION ; TRACE FOSSILS ; NORTH-AMERICA ; EARLY MIOCENE ; LEAF-AREA ; EVOLUTION ; CLIMATE ; PALEOSOLS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351005
作者单位	[Bellosi, Eduardo; Genise, Jorge F.; Kramarz, Alejandro; Sanchez, M. Victoria] Consejo Nacl Invest Cient & Tecn, Museo Argentino Ciencias Natur, Buenos Aires, DF, Argentina; [Zucol, Alejandro] Ctr Invest Cient & Transferencia Tecnol Prod, CONICET, Diamante, Entre Rios, Argentina; [Bond, Mariano] Univ Nacl La Plata, Fac Ciencias Nat & Museo, CONICET, La Plata, Buenos Aires, Argentina; [Krause, J. Marcelo] Univ Nacl Rio Negro, CONICET, Museo Paleontol E Feruglio, Gen Roca, Rio Negro, Argentina
推荐引用方式 GB/T 7714	Bellosi, Eduardo,Genise, Jorge F.,Zucol, Alejandro,et al. Diverse evidence for grasslands since the Eocene in Patagonia[J],2021,108.
APA	Bellosi, Eduardo.,Genise, Jorge F..,Zucol, Alejandro.,Bond, Mariano.,Kramarz, Alejandro.,...&Krause, J. Marcelo.(2021).Diverse evidence for grasslands since the Eocene in Patagonia.JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,108.
MLA	Bellosi, Eduardo,et al."Diverse evidence for grasslands since the Eocene in Patagonia".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 108(2021).