DOI: 10.1016/j.quascirev.2018.07.015
Scopus记录号: 2-s2.0-85051530082
论文题名: Climate ultrastructure and aquatic community response to Heinrich Stadials (HS5a-HS1) in the continental northern Neotropics
作者: Cohuo S. ; Macario-González L. ; Pérez L. ; Sylvestre F. ; Paillès C. ; Curtis J.H. ; Kutterolf S. ; Wojewódka M. ; Zawisza E. ; Szeroczyńska K. ; Schwalb A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 197 起始页码: 75
结束页码: 91
语种: 英语
英文关键词: Central America
; Micropaleontology
; Multiproxy approach
; Paleolimnology
; Quaternary
; Transfer functions
Scopus关键词: Calcite
; Calcium carbonate
; Lakes
; Magnetic susceptibility
; Microstructure
; Paleolimnology
; Temperature
; Transfer functions
; Central America
; Climatic fluctuations
; Environmental conditions
; Habitat heterogeneities
; Lake water temperature
; Micropaleontology
; Multiproxy approach
; Quaternary
; Aquatic organisms
; aquatic organism
; calcium carbonate
; climate conditions
; climate variation
; community response
; environmental conditions
; Heinrich event
; lake water
; micropaleontology
; Neotropical Region
; ostracod
; paleoclimate
; paleolimnology
; Quaternary
; sediment analysis
; species diversity
; transfer function
; water temperature
; Central America
; Guatemala [Central America]
; Lake Peten Itza
; Peten
英文摘要: We reconstruct environmental conditions of the period 53-14 kyr BP in the continental northern Neotropical region. We evaluate in detail the magnitude of climatic fluctuations and their effects on aquatic communities during six Heinrich Stadials (HS1-HS5a), using sediments from Lake Petén Itzá Guatemala, and a multiproxy approach. In Lake Petén Itzá typical Heinrich Stadials (HSs) are recorded in sediments as alternations of gypsum and clay, and abrupt changes in magnetic susceptibility, CaCO3 and biological compositions. This suggests that HSs were periods of hydrological unbalance, characterized by dry spells, punctuating the predominant humid conditions characterizing the period 53-14 kyr BP. The ultrastructure of HSs allows us to identify four different types of climatic conditions associated to HSs: 1) prevailing dry conditions but changing to humid (HS5, HS3); 2) predominantly humid conditions but changing to arid (HS2); 3) fluctuating humid-dry-humid (HS4, HS1); and 4) arid with high lake water conductivity (HS5a). The continuous presence of tropical ostracode species during HSs suggests that lake water temperatures were not drastically lowered. Ostracode-based transfer functions indicate that during HSs, epilimnetic water temperatures decreased by 1–3 °C compared to mean modern temperatures. Lake solute composition and conductivity were strongly affected by HSs. During HS5a and HS1 we estimate conductivity values > 800 μS cm−1. Diversity indices show significant differences (F5,70 = 3.74, p = 0.004) of ostracode species composition among HSs. Highest diversities occurred during HS5a, HS4 and HS1, which display greater climatic alterations than the other HSs. Fluctuating climates seem to have exerted positive effects on diversity of aquatic communities by producing an increase in habitat heterogeneity. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112062
Appears in Collections: 气候减缓与适应
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作者单位: Institut für Geosysteme und Bioindikation, Technische Universität Braunschweig, Braunschweig, Germany; Instituto de Geología, Universidad Nacional Autónoma de México, Mexico; Aix-Marseille Université, CNRS, IRD, Collège de France, INRA, CEREGE, Europôle méditerranéen de l'Arbois, Aix-en-Provence, 13545, France; Department of Geological Sciences, University of Florida, Gainesville, FL, United States; GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Germany; Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Warsaw, Poland
Recommended Citation:
Cohuo S.,Macario-González L.,Pérez L.,et al. Climate ultrastructure and aquatic community response to Heinrich Stadials (HS5a-HS1) in the continental northern Neotropics[J]. Quaternary Science Reviews,2018-01-01,197