scholarly journals Classification of geochemical data based on multivariate statistical analyses: Complementary roles of cluster, principal component, and independent component analyses

2017 ◽  
Vol 18 (3) ◽  
pp. 994-1012 ◽  
Author(s):  
Hikaru Iwamori ◽  
Kenta Yoshida ◽  
Hitomi Nakamura ◽  
Tatsu Kuwatani ◽  
Morihisa Hamada ◽  
...  
Keyword(s):  
Principal Component ◽  
Independent Component ◽  
Statistical Analyses ◽  
Geochemical Data ◽  
Multivariate Statistical Analyses ◽  
Multivariate Statistical

Wood anatomical variability in Early Permian ‘araucarioids’

IAWA Journal ◽  
2014 ◽  
Vol 35 (3) ◽  
pp. 307-331 ◽  
Author(s):  
Menno Booi ◽  
Isabel M. van Waveren ◽  
Johanna H.A. van Konijnenburg-van Cittert
Keyword(s):  
Principal Component Analysis ◽  
Wood Species ◽  
Principal Component ◽  
Statistical Analyses ◽  
Late Paleozoic ◽  
Individual Species ◽  
Early Permian ◽  
Multivariate Statistical Analyses ◽  
Multivariate Statistical ◽  
Anatomical Analysis

Although araucarioid wood is poor in diagnostic characters, well in excess of 200 Late Paleozoic species have been described. This study presents a largescale anatomical analysis of this wood type based on the fossil wood collections from the Early Permian Mengkarang Formation of Sumatra, Indonesia. Principal Component Analysis visualisation, in conjunction with uni- and multivariate statistical analyses clearly show the wood from the Mengkarang Formation to be a contiguous micromorphological unit in which no individual species can be distinguished. Pycnoxylic wood species described previously from this collection or other collections from the Mengkarang Formation fall within the larger variability described here. Based on comparison with wood from modern-day Araucariaceae, the Early Permian specimens can be differentiated from extant (but unrelated) “araucarioids” by a few (continuous) characters.

A taxonomic revision of Schisandra section Sphaerostema (Schisandraceae)

1997 ◽  
Vol 54 (3) ◽  
pp. 265-287 ◽  
Author(s):  
R. M. K. Saunders
Keyword(s):  
Southern China ◽  
Taxonomic Revision ◽  
Statistical Analyses ◽  
Multivariate Statistical Analyses ◽  
Multivariate Statistical ◽  
Taxonomic Descriptions ◽  
Ne India

The classification of Schisandra Michx. sect. Sphaerostema (Blume) Nakai is revised, using multivariate statistical analyses as required. Only two species are recognized, viz. Schisandra plena A.C. Sm. and S. propinqua (Wall.) Baill., following reduction of S. axillaris (Blume) Hook.f. & Thorns, to a subspecies of the latter taxon. Four subspecies are recognized in S. propinqua, viz.: subsp. propinqua (N W India and Nepal); subsp. intermedia (A.C. Sm), stat. nov. (NE India, Burma and Yunnan); subsp. sinensis (Oliv.), stat. nov. (central and southern China); and subsp. axillaris (Blume), comb, et stat. nov. (Java and Bali). The biogeographical origin of the vicariant distribution of S. propinqua is discussed. A key is provided for the identification of taxa, with new taxonomic descriptions.

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