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Cohuo S., Macario-Gonzalez L., Perez L., Sylvestre Florence, Pailles C., Curtis J. H., Kutterolf S., Wojewodka M., Zawisza E., Szeroczynska K., Schwalb A. (2018). Climate ultrastructure and aquatic community response to Heinrich Stadials (HS5a-HS1) in the continental northern Neotropics. Quaternary Science Reviews, 197, 75-91. ISSN 0277-3791

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Lien direct chez l'éditeur doi:10.1016/j.quascirev.2018.07.015

Titre
Climate ultrastructure and aquatic community response to Heinrich Stadials (HS5a-HS1) in the continental northern Neotropics
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000447085200005
AuteursCohuo S., Macario-Gonzalez L., Perez L., Sylvestre Florence, Pailles C., Curtis J. H., Kutterolf S., Wojewodka M., Zawisza E., Szeroczynska K., Schwalb A.
SourceQuaternary Science Reviews, 2018, 197, p. 75-91. ISSN 0277-3791
RésuméWe 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 Peten Itza, Guatemala, and a multiproxy approach. In Lake Peten Itza 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 degrees C compared to mean modern temperatures. Lake solute composition and conductivity were strongly affected by HSs. During HS5a and HSI we estimate conductivity values > 800 mu S cm(-1). Diversity indices show significant differences (F-5,F-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.
Plan de classementGéologie et formations superficielles [064] ; Ecologie, systèmes aquatiques [036] ; Sciences du milieu [021]
Descr. géo.GUATEMALA ; PETEN ITZA LAC
LocalisationFonds IRD [F B010074139]
Identifiant IRDfdi:010074139
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010074139

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