DOI: 10.1016/j.palaeo.2014.05.007
论文题名: Palaeoecological distribution pattern of Early-Middle Jurassic benthic foraminifera in the Lusitanian Basin (Portugal) based on multivariate analysis
作者: Canales Ferna´ndez M.L. ; Garci´a-Baquero G. ; Henriques M.H. ; Figueiredo V.L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 410 起始页码: 14
结束页码: 26
语种: 英语
英文关键词: Assemblage structure
; Foraminifera
; Lower-Middle Jurassic boundary
; Lusitanian Basin
; PERMANOVA
; Unconstrained/constrained ordination
英文摘要: Paleontologists have favoured univariate statistical methods over multivariate ones, using information-rich data to derive diversity measures such as the Simpson's index. However, such palaeontological datasets may benefit from flexible multivariate methods that exploit data directly. Hence in this work, with the aim of quantifying and characterising the spatio-temporal change in the species composition and abundance of benthic foraminiferal assemblages, univariate and multivariate statistical techniques are applied on a Lusitanian Basin dataset from the Lower-Middle Jurassic transition. This paper presents the trends identified at spatial and temporal scales, i.e. among sections corresponding to distal, middle and proximal palaeogeographical positions within the platform and between two successive stratigraphic intervals (upper Toarcian and lower Aalenian). It also compares the results obtained by univariate and multivariate methods.Samples in the reference sections are composed by taxa typical of the Jurassic carbonate marine platforms of the Boreal Realm, such as Vaginulinidae and Lenticulina species. Univariate analysis only found significant change in species diversity between the two most distant sections and failed to detect any temporal change. In contrast, multivariate analysis (PERMANOVA and NMDS) revealed that spatial change in assemblage structure (22%) quadruples temporal change (5%). CAP analysis identified characteristic species for each section along the palaeogradient, with a posterior cross-validation procedure that classified correctly 97% of the samples. In fact, multivariate results suggest the existence of stable palaeoecological conditions across the Lower-Middle Jurassic transition in the Lusitanian Basin. Future work in the field may benefit from multivariate analysis, including hydrocarbon exploration activities where only core samples are available and foraminifera are currently used. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69279
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Paleontology, Faculty of Geological Sciences, Universidad Complutense of Madrid, Spain; Department of Plant Biology and Ecology, University of the Basque Country, Apartado 644, Bilbao, Spain; Geosciences Centre, Department of Earth Sciences of the University of Coimbra, Portugal; Geosciences Centre of the Univ. of Coimbra, Laborato´rio Nacional de Geologia e Energia, Portugal
Recommended Citation:
Canales Ferna´ndez M.L.,Garci´a-Baquero G.,Henriques M.H.,et al. Palaeoecological distribution pattern of Early-Middle Jurassic benthic foraminifera in the Lusitanian Basin (Portugal) based on multivariate analysis[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,410