DOI: 10.1016/j.quascirev.2018.05.013
Scopus记录号: 2-s2.0-85047068057
论文题名: A 27cal ka biomarker-based record of ecosystem changes from lacustrine sediments of the Chihuahua Desert of Mexico
作者: Chávez-Lara C.M. ; Holtvoeth J. ; Roy P.D. ; Pancost R.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 191 起始页码: 132
结束页码: 143
语种: 英语
英文关键词: Continental biomarkers
; Holocene
; North America
; Organic geochemistry
; Paleoclimatology
; Paleolimnology
; Pleistocene
Scopus关键词: Aquatic ecosystems
; Geochemistry
; Glacial geology
; Paleolimnology
; Storms
; Vegetation
; Holocenes
; North America
; Organic geochemistry
; Paleoclimatology
; Pleistocene
; Biomarkers
; alga
; bacterium
; biomarker
; ecosystem dynamics
; Heinrich event
; Holocene
; hydrological change
; hydrometeorology
; lacustrine deposit
; Last Glacial
; organic geochemistry
; organic matter
; paleoclimate
; paleolimnology
; Pleistocene
; Chihuahuan Desert
; Mexico [North America]
; algae
; Bacteria (microorganisms)
; Poaceae
英文摘要: Hydroclimate variation of the northwest Mexico during the late Pleistocene and Holocene is an active area of debate, with uncertainty in the nature and sources of precipitation. Previous research has inferred the influences of winter storms, summer monsoonal rain and autumn tropical cyclones. The impacts on regional and local ecosystems, however, are not well constrained. Here, we investigate the response of lacustrine and terrestrial habitats of the Santiaguillo Basin in the Chihuahua Desert (Mexico) to hydrological changes occurring since the late last glacial. Biomarkers from the sediments reflect variable input of organic matter (OM) from algal and bacterial biomass, aquatic microfauna and surrounding vegetation, revealing distinct stages of ecosystem adaption over the last 27 cal ka. Based on previously published and new data, we show that a perennial productive lake was present during the late glacial and it persisted until 17.5 cal ka BP. Coinciding with Heinrich event 1, OM supply from deteriorating wetland soils may have been caused by early dry conditions. Further phases of increasing aridity and a shrinking water body drove changing OM quality and biomarker composition during the early and mid-Holocene. A pronounced shift in biomarker distributions at 4 cal ka BP suggests that the supply of plant litter from resinous trees and grasses increased, likely reflecting the establishment of modern vegetation. Our results illustrate the potential of biomarker applications in the area, adding to the evidence of hydroclimate variability and enabling reconstructions of local ecosystem dynamics. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112167
Appears in Collections: 气候减缓与适应
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作者单位: Organic Geochemistry Unit, School of Chemistry, School of Earth Sciences, University of Bristol Cabot Institute, University of Bristol, Bristol, United Kingdom; Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, CP 04510, Mexico
Recommended Citation:
Chávez-Lara C.M.,Holtvoeth J.,Roy P.D.,et al. A 27cal ka biomarker-based record of ecosystem changes from lacustrine sediments of the Chihuahua Desert of Mexico[J]. Quaternary Science Reviews,2018-01-01,191