Range-wide morphological and anatomical variation in Larix laricina

1990 ◽  
Vol 68 (4) ◽  
pp. 832-840 ◽  
Author(s):  
William H. Parker ◽  
Timothy A. Dickinson
Keyword(s):  
Anatomical Variation ◽  
Species Range ◽  
Larix Laricina ◽  
The South ◽  
Short Shoot ◽  
Canonical Variates Analysis ◽  
Infraspecific Variation ◽  
Canonical Variates ◽  
Morphological And Anatomical Variation

To investigate the nature of infraspecific variation in Larix laricina (Du Roi) K. Koch, 60 naturally established stands constituting 44 provenances were sampled from throughout the species' range. Cones were scored for nine traits and short-shoot needle transverse sections were scored for seven traits and 20 radial distances. Variation in all traits was minimal, with the greatest components expressed between trees within stands and within trees. Canonical variates analysis of needle traits demonstrated that provenances were differentiated according to location, whereas canonical variates analysis of cone traits showed a much weaker geographic trend. These results are consistent with the hypothesis that Alaska and northern Yukon provenances resulted from geographically separate migratory waves originating from different locations in the south following glacial recession. While Alaska provenances were distinguished from other provenances based on canonical variates analysis of needle data, but not of cone data, this distinction is insufficient to recognize Alaska tamaracks separately at either the species or varietal level.

A multivariate approach to plant mineral nutrition: dose–response relationships and nutrient dominance in factorial experiments

1985 ◽  
Vol 63 (12) ◽  
pp. 2138-2143 ◽  
Author(s):  
G. R. Shaver ◽  
M. J. Lechowicz
Keyword(s):  
Dose Response ◽  
Nutrient Content ◽  
N Fertilization ◽  
Mineral Elements ◽  
P Fertilization ◽  
Canonical Variates Analysis ◽  
Canonical Variates ◽  
Low Levels ◽  
High Fertilization ◽  
K Fertilization

Canonical variates analysis was used to compare the effects of fertilization on the concentrations of five mineral elements (N, P, K, Ca, and Mg) in young shoot tissues of six tundra plant species of three different growth forms. There were two specific objectives: (i) to determine whether it was possible to describe meaningful dose–response relationships in a multivariate response to fertilization, and (ii) to determine the multivariate effect of N plus P fertilization in comparison with the effects of N or P added alone. The results showed that low levels of N–P–K fertilization caused a shift in multivariate nutrient content that was intermediate between the control values and the shift caused by high fertilization, and in the same direction as the latter. In a June harvest, the effect of N plus P fertilization was very similar to the effect of N fertilization alone. However, in August the N plus P effect was dominated by the response to P alone. In all of the analyses, the fundamental similarities and differences among unfertilized plants of each species and growth form were maintained under fertilization.

Evaluation of morphological and anatomical characters for discrimination and verification of some Medicago sativa (L.) Cultivars

2016 ◽  
Vol 50 (2) ◽  
Author(s):  
Mohamed M. Moawed
Keyword(s):  
Medicago Sativa ◽  
Seed Coat ◽  
Anatomical Variation ◽  
Morphological Characters ◽  
Vascular Bundles ◽  
Surface Patterns ◽  
Anatomical Characters ◽  
Periclinal Walls ◽  
Seed Coat Morphology ◽  
Morphological And Anatomical Variation

<italic>Medicago sativa</italic> L. (alfalfa) is one of the most important legume forages in the world. The objective of this study was to characterize and discriminate among 15 alfalfa cultivars with a different geographical origin. Macro-morphological and anatomical characters as well as seed coat sculpture were investigated. Twenty five morphological characters were extracted directly from the fresh specimens. Transverse section in the main stem were carried out; stained and seventeen anatomical characters were examined by light microscope. Seed coat surface was investigated using Scanning Electron Microscope (SEM). Data obtained were coded and analysed using NTsys-Pc software (Version 2.02) and the resulted dendrogram is discussed. The results showed morphological and anatomical variation between the studied taxa. Vascular bundles ranged from 16 to 23. The Egyptian cultivar Nubaria has the lowest number of vessels (16) while the American Super supreme has the larger number (23). The seed coat ornamentation revealed five main surface patterns and suggests the presence of variations in anticlinal boundaries and periclinal walls that provide stable diagnostic characters for morphologically closely related taxa. The dendrogram showed that the Egyptian cultivar Nubaria was the most distant and clustered separately from all the other alfalfa cultivars which were grouped into two main clusters. Seed coat morphology and combination of other plant morphological and anatomical characters permitted identification and discrimination between the examined cultivars. Results obtained in this work could be considered for further breeding strategies and studies.

Phenotypic variation of south-western Atlantic clam Mactra isabelleana (Bivalvia: Mactridae)

2012 ◽  
Vol 93 (2) ◽  
pp. 511-517 ◽  
Author(s):  
Javier H. Signorelli ◽  
Federico Márquez ◽  
Guido Pastorino
Keyword(s):  
Principal Component ◽  
Shell Shape ◽  
Physical Parameters ◽  
Buenos Aires Province ◽  
Shape Variation ◽  
Geometric Morphometric ◽  
Western Atlantic ◽  
Canonical Variates Analysis ◽  
Canonical Variates ◽  
Geometric Morphometric Method

The phenotypic shell shape variation of Mactra isabelleana was tested using the geometric morphometric method. Four localities were sampled along the Río de la Plata estuary and the coast of Buenos Aires province. Principal component analysis and canonical variates analysis of the first principal components were performed to reveal the shell variation and differences among localities, respectively. The specimens from different microhabitats mostly overlapped, although differences in shape were observed in the development of the umbo, the enlargement of the dorsoventral axes and the elongation of the posterior end. The ecological and physical parameters that could influence shell shape variation are discussed.

Crown architecture of Larix laricina saplings: an analysis of higher order branching

1987 ◽  
Vol 65 (2) ◽  
pp. 268-279 ◽  
Author(s):  
W. R. Remphrey ◽  
G. R. Powell
Keyword(s):  
Simulation Modelling ◽  
Shoot Length ◽  
Larix Laricina ◽  
Structural Development ◽  
Short Shoot ◽  
Lateral Buds ◽  
Architectural Patterns ◽  
Long Shoots ◽  
Short Shoots ◽  
Terminal Shoot

Quantitative analysis and simulation modelling of Larix laricina (Du Roi) K. Koch branches revealed a complex system of architectural patterns and correlations. Numbers of lateral buds and long shoots were positively correlated with parent-shoot length, but the relationships varied among shoot orders and for sylleptic shoots. For order 2 and sylleptic shoots, numbers of lateral long shoots were also correlated with associated terminal-shoot lengths. Sylleptic shoots produced more lateral long shoots than equivalent proleptic shoots. Lateral long-shoot lengths decreased basipetally and were correlated with terminal-shoot lengths. Lengths of order 2 lateral long shoots also varied independently with crown position. Generally, the degree of apical control decreased and the proportion of short shoots increased with positions of less vigour in the crown. Terminal long-shoot lengths varied with parent-shoot length, location, and to some extent parent-axis leader length. Terminal short-shoot production was associated with shorter parent shoots. Shorter order 2 shoots (<60 mm) and most order 3 shoots produced no lateral long shoots. The net result was that branch structural development ceased in less vigorous crown positions. The spatial disposition of shoots, as defined by elevation and divergence angles, varied with position of origin around and along parent shoots. Although variable, elevation angles decreased and divergence angles increased basipetally.

Fluorescence spectroscopy and chemometrics for classification of breast cancer samples—a feasibility study using extended canonical variates analysis

2007 ◽  
Vol 21 (10-11) ◽  
pp. 451-458 ◽  
Author(s):  
Lars Nørgaard ◽  
György Sölétormos ◽  
Niels Harrit ◽  
Morten Albrechtsen ◽  
Ole Olsen ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Fluorescence Spectroscopy ◽  
Feasibility Study ◽  
Canonical Variates Analysis ◽  
Canonical Variates

scholarly journals Differentiation of face and auricular shape resulting from diabetes and hypertension in the elderly

2021 ◽  
Vol 37 ◽  
pp. e37030
Author(s):  
Lorena Andrade Nunes ◽  
Cezar Augusto Casotti ◽  
Edilson Divino de Araújo
Keyword(s):  
Chronic Diseases ◽  
Mahalanobis Distance ◽  
Digital Camera ◽  
The Elderly ◽  
Policy Makers ◽  
Canonical Variates Analysis ◽  
Face Shape ◽  
Preventative Measures ◽  
Canonical Variates ◽  
At Risk Populations

The prevalence global of noncommunicable chronic diseases as diabetes and hypertension worldwide has been disregarded until recently by policy makers. In addition, these diseases have growing with the aging of the population. This study sought to identify changes in face shape from the frontal and side views in elderly people diagnosed with diabetes and hypertension. 205 individuals were studied, with 60 years or more, from both sexes, with different ethnicities, and cognition intact. With a digital camera, photos were taken of the front and side and based on these images landmarks for measurement were determined. For statistical analysis, ANOVA, Canonical Variates Analysis, Mahalanobis distance and Thin-Plate Spline were realized. Given sexual dimorphism, the sexes were analyzed separately. From the ANOVA, significant differences (p<0.01) for individuals with diabetes, hypertension, and patients with both or neither of the diseases were observed. The groups were separated by the Canonical Variates and Mahalanobis distance and independent of edentulism, sex or ethnicity. A morphofacial characteristics for the front and side views (especially in the ear region) that identified individuals with these chronic diseases was observed. This methodology can contribute in a specific manner to the identification of at risk populations and help to promote preventative measures for these conditions.

A multivariate procedure for classifying environments according to their interaction with genotypes

1979 ◽  
Vol 30 (6) ◽  
pp. 1021 ◽  
Author(s):  
E Seif ◽  
JC Evans ◽  
LN Balaam
Keyword(s):  
New South ◽  
New South Wales ◽  
Interaction Effects ◽  
Canonical Variate ◽  
Canonical Variates Analysis ◽  
Wheat Genotypes ◽  
South Wales ◽  
Canonical Variates ◽  
Location Interaction

Canonical variates analysis was adapted to the problem of classifying environments according to their interactions with wheat genotypes, and was used to subdivide the Central West of New South Wales into uniform sub-regions. The method takes into account any fluctuations from year to year in the genotype x location interaction effects, and has several other advantages over the procedures previously used. Most of the variability among locations was represented by one canonical variate and was related to an east-westerly trend. It is suggested that the Central West be divided into two sub-regions, the eastern slopes and the western plains, for the purpose of varietal evaluations and recommendations.

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