globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2014.06.007
Scopus记录号: 2-s2.0-84903627286
论文题名:
Mauritia flexuosa palm swamp communities: Natural or human-made? A palynological study of the Gran Sabana region (northern South America) within a neotropical context
作者: Rull V.; Montoya E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 99
起始页码: 17
结束页码: 33
语种: 英语
英文关键词: Human disturbance ; Last millennia ; Mauritia ; Neotropics ; Palaeoecology ; Palm swamps
Scopus关键词: Charcoal ; Glacial geology ; Human disturbances ; Last millennia ; Mauritia ; Neotropics ; Palaeoecology ; Palm swamps ; Wetlands ; community structure ; evergreen tree ; human activity ; Last Glacial Maximum ; microclimate ; Neotropical Region ; palynology ; pollen ; population distribution ; proxy climate record ; Amazon Basin ; Orinoco River
英文摘要: Mauritia flexuosa L.f. is one of the more widely distributed neotropical palms and is intensively used by humans. This palm can grow in tropical rainforests or can develop a particular type of virtually monospecific communities restricted to warm and wet lowlands of the Orinoco and Amazon basins. It has been proposed that, during the Last Glacial Maximum (LGM), the Mauritia swamp communities were restricted to the core of the Amazon basin from where they expanded favoured by the Holocene warmer and wetter climates. It has also been suggested that some of these palm communities might have been the result of human dispersal during the last millennia. Here, we evaluate both hypotheses using the case study of the Venezuelan Gran Sabana (GS) region, where the M.flexuosa swamp communities (locally called morichales) are common and well developed. The morichales did not reach the GS until the last 2000 years, as manifested by sudden increases of Mauritia pollen parallelled by similar trends in charcoal particles as proxies for fire. During the last two millennia, the situation was very similar to the present, characterised by extensive burning practices affecting savannas and savanna-forest ecotones but rarely morichales (selective burning). This strongly suggests that human activities could have been responsible for the penetration of the morichales to the GS. A meta-analysis of the available records of Mauritia pollen across northern South America shows that this palm has been present in the region since at least the last four glacial cycles. During the LGM, Mauritia was likely restricted to few but widespread sites of favourable microclimatic conditions (microrefugia) from where the palm expanded during the Holocene. During the last 2000 years, Mauritia underwent a remarkable expansion in northern South America, which includes the GS. It is proposed that humans could have played a role in this regional expansion of Mauritia communities. © 2014 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60182
Appears in Collections:过去全球变化的重建

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作者单位: Palynology and Paleoecology Lab, Botanic Institute of Barcelona (IBB-CSIC-ICUB), Pg. del Migdia s/n, 08038 Barcelona, Spain; Dep. of Environment, Earth and Ecosystems, Research Centre for Physical and Environmental Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom

Recommended Citation:
Rull V.,Montoya E.. Mauritia flexuosa palm swamp communities: Natural or human-made? A palynological study of the Gran Sabana region (northern South America) within a neotropical context[J]. Quaternary Science Reviews,2014-01-01,99
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