DOI: 10.1016/j.palaeo.2014.07.009
论文题名: Assessment of a diatom-based transfer function for the reconstruction of lake-level changes in Boqueirão Lake, Brazilian Nordeste
作者: Gomes D.F. ; Albuquerque A.L.S. ; Torgan L.C. ; Turcq B. ; Sifeddine A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 415 起始页码: 105
结束页码: 116
语种: 英语
英文关键词: Brazil
; Diatoms
; Lake-level
; Quantitative reconstructions
英文摘要: Transfer functions have been developed to quantify the relations between organism assemblages and environmental variables and to apply these models to reconstruct past conditions. We present an assessment of a transfer function developed to reconstruct the depth of Boqueirão Lake in the Brazilian Northeast region. This region is affected by the Intertropical Convergence Zone and El Niño that create rainy and drought periods and that affect lake water level and can cause algal community compositional shifts. To reconstruct an algal depth profile of Boqueirão Lake, we used diatom calibration data-sets from 72 lake superficial sediment samples. After excluding rare species (<1%), we developed a transfer function model using sixty species, almost all exclusively benthic. Five environmental variables (silt, clay, pH, dissolved oxygen and depth) were also selected. Partial Canonical Correspondence Analysis indicated that silt and depth have the highest shared effect in terms of partially explained variance and λ1/λ2. The reduced set of explanatory variables captured 14.3% of the total variance in diatom distributions. We assess six models to reconstruct past lake levels. No one model generated the best results in all aspects of transfer functions generated to map the water depth, but all reconstructions fall within the range of variation of the system. Although their results did not converge to a specific depth, they converged for depicting periods of lowered water levels or periods of floods. This convergence suggests that the diatom-based transfer function for the reconstruction of the paleodepth of Boqueirão Lake is reliable. © 2014 Elsevier B.V. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69169
Appears in Collections: 过去全球变化的重建
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作者单位: Instituto de Biologia, Universidade Federal da Bahia, Salvador, Brazil; Instituto de Química, Universidade Federal Fluminense, Rio de Janeiro, Brazil; Fundação Zoobotânica do Rio Grande do Sul, Porto Alegre, Brazil; Institut de Recherche pour le Développement, France
Recommended Citation:
Gomes D.F.,Albuquerque A.L.S.,Torgan L.C.,et al. Assessment of a diatom-based transfer function for the reconstruction of lake-level changes in Boqueirão Lake, Brazilian Nordeste[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,415