Biosystematics of the Cotesia flavipes species complex (Hymenoptera: Braconidae): morphometrics of selected allopatric populations

1997 ◽  
Vol 87 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Susan W. Kimani-Njogu ◽  
William A. Overholt ◽  
James Woolley ◽  
Annette Walker
Keyword(s):  
Principal Component Analysis ◽  
Species Complex ◽  
Principal Component ◽  
Cotesia Flavipes ◽  
Canonical Variate Analysis ◽  
Canonical Variate ◽  
Allopatric Populations ◽  
Putative Species ◽  
Variate Analysis ◽  
China And Japan

AbstractMorphometric studies of allopatric populations of the Cotesia flavipes species complex representing three putative species; C. flavipes Cameron, C. sesamiae (Cameron) and C. chilonis (Matsumura), were conducted. Sixteen characters were measured. Principal component analysis separated the complex into three somewhat overlapping groups that corresponded well with previous concepts of the species. Canonical variate analysis separated the complex into three distinct clusters with populations from Africa together, populations from Asia and the Neotropics forming a second cluster, and material from China and Japan forming a third cluster. The Mahalanobis squared distances between the three clusters were nearly equal. Results support recognition of three species in the C. flavipes complex.

scholarly journals Morphological Discrimination of Greek Honey Bee Populations Based on Geometric Morphometrics Analysis of Wing Shape

2014 ◽  
Vol 58 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Leonidas Charistos ◽  
Fani Hatjina ◽  
Maria Bouga ◽  
Mica Mladenovic ◽  
Anastasios D. Maistros
Keyword(s):  
Principal Component Analysis ◽  
Geometric Morphometrics ◽  
Honey Bee ◽  
Principal Component ◽  
Component Analysis ◽  
Canonical Variate Analysis ◽  
Procrustes Analysis ◽  
Canonical Variate ◽  
Wing Vein ◽  
Variate Analysis

Abstract Honey bees collected from 32 different localities in Greece were studied based on the geometric morphometrics approach using the coordinates of 19 landmarks located at wing vein intersections. Procrustes analysis, principal component analysis, and Canonical variate analysis (CVA) detected population variability among the studied samples. According to the Principal component analysis (PCA ) of pooled data from each locality, the most differentiated populations were the populations from the Aegean island localities Astypalaia, Chios, and Kythira. However, the populations with the most distant according to the canonical variate analysis performed on all measurements were the populations from Heraklion and Chania (both from Crete island). These results can be used as a starting point for the use of geometric morphometrics in the discrimination of honey bee populations in Greece and the establishment of conservation areas for local honey bee populations.

scholarly journals Leaf geometric morphometrics among populations of Dalbergia ecastaphyllum (L.) Taub.

2019 ◽  
Vol 35 (6) ◽  
Author(s):  
Daniel Vieira de Morais ◽  
Lorena Andrade Nunes ◽  
Vandira Pereira da Mata ◽  
Maria Angélica Pereira de Carvalho Costa ◽  
Geni da Silva Sodré ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Geometric Morphometrics ◽  
Cross Validation ◽  
Abiotic Factors ◽  
Principal Component ◽  
Canonical Variate ◽  
Validation Test ◽  
Significant Difference ◽  
Variate Analysis ◽  
Geographical Distances

Leaves are plant structures that express important traits of the environment where they live. Leaf description has allowed identification of plant species as well as investigation of abiotic factors effects on their development, such as gases, light, temperature, and herbivory. This study described populations of Dalbergia ecastaphyllum through leaf geometric morphometrics in Brazil. We evaluated 200 leaves from four populations. The principal component analysis (PCA) showed that the first four principal components were responsible for 97.81% of variation. The non-parametric multivariate analysis of variance (NPMANOVA) indicated significant difference between samples (p = 0.0001). The Mentel test showed no correlation between geographical distances and shape. The canonical variate analysis (CVA) indicated that the first two variables were responsible for 96.77 % of total variation, while the cross-validation test showed an average of 83.33%. D. ecastaphyllum leaves are elliptical and ovate.

Morphometric variations between seasonal migrants of anadromous shad Tenualosa ilisha (Hamilton, 1822) from Hooghly Estuary, India

2019 ◽  
Vol 70 (10) ◽  
pp. 1427 ◽  
Author(s):  
A. K. Dwivedi
Keyword(s):  
Principal Component Analysis ◽  
Function Analysis ◽  
Monsoon Season ◽  
Principal Component ◽  
Canonical Variate ◽  
Hooghly Estuary ◽  
Fish Samples ◽  
Variate Analysis ◽  
Tenualosa Ilisha ◽  
Relative Warps

The morphometric variations between two seasonal migrants (winter and monsoon) of anadromous shad Tenualosa ilisha from Hooghly Estuary were evaluated and compared using geometric morphometrics (GM). Altogether, 128 fish samples of T. ilisha, comprising 64 samples each from winter and the monsoon season, were collected for two successive years (2017 and 2018) and 14 landmarks were digitised uniformly on each individual. Relative warps (RW), principal component analysis (PCA), canonical variate analysis (CVA) and discriminant function analysis (DFA) were used to determine shape variations between seasonal runs. The deformation grid of RW showed that monsoon specimens have a deeper body profile, whereas winter specimens have a slender body profile. The PCA showed low variance (40.45% for first two principal components) and high overlap among all the groups. The CVA-extracted Mahalanobis and Procrustes distances (3.473 and 0.032 respectively) between the two groups (winter and monsoon) were highly significant (P<0.0001). The DFA also separated two groups with high cross-validated classification rates (85.94 and 95.31% of winter and monsoon specimens respectively were correctly classified). Hence, the results of RW, CVA and DFA clearly indicate the existence of two morphologically distinct units of T. ilisha in Hooghly Estuary.

Canonical variate analysis of genotype × environment interactions

1999 ◽  
Vol 79 (3) ◽  
pp. 427-431 ◽  
Author(s):  
G. C. C. Tai
Keyword(s):  
Tuber Yield ◽  
Principal Component ◽  
Environmental Parameters ◽  
Canonical Variate Analysis ◽  
Canonical Variate ◽  
Yield Data ◽  
Physical Unit ◽  
Variate Analysis ◽  
Ammi Model ◽  
Main Effects

The additive main effects and multiplicative interaction (AMMI) model is used to investigate genotype × environment interactions often encountered in variety trials. Interaction effects are accounted for by several multiplicative terms in the model, with each consisting of a genotypic and an environmental parameter. These effects are estimated using principal-component analysis. An alternative method is presented to estimate the genotypic and environmental parameters in the multiplicative terms of the AMMI model by canonical variate analysis. The number of significant interactive terms can be easily determined using the χ2 test. Each of the multiplicative terms include a unitless coefficient measuring genotypic response and an environmental effect in terms of the physical unit of the concerned trait. Biplots can be used with the scores of both genotypes and environments for graphic examination of analytic results. Total tuber-yield data from potato genotypes tested in a series of international trials are used to illustrate the new analytic procedure. Key words: Genotype × environment interactions, AMMI, canonical variate analysis, potato

Diversity and variation of theropod dinosaur teeth from the uppermost Santonian Milk River Formation (Upper Cretaceous), Alberta: a quantitative method supporting identification of the oldest dinosaur tooth assemblage in Canada

2008 ◽  
Vol 45 (12) ◽  
pp. 1455-1468 ◽  
Author(s):  
Derek W. Larson
Keyword(s):  
Principal Component ◽  
Canonical Variate Analysis ◽  
Canonical Variate ◽  
Large Sample Size ◽  
Accurate Identification ◽  
Theropod Dinosaur ◽  
Variate Analysis ◽  
Dinosaur Teeth ◽  
Milk River Formation ◽  
Range Of Variation

The Santonian Deadhorse Coulee Member of the Milk River Formation preserves the oldest dinosaur body fossils found in Alberta. However, vertebrate remains consist almost exclusively of isolated elements and microvertebrate assemblages. Here, 1572 relatively complete shed non-avian theropod teeth from 20 localities in the Deadhorse Coulee Member are measured and analyzed to assess species diversity. Teeth are referred to or similar to Tyrannosaurinae indet., cf. Richardoestesia gilmorei , cf. Richardoestesia isosceles , Dromaeosauridae indet., Dromaeosaurinae indet., Velociraptorinae indet., and cf. Paronychodon lacustris . For the taxa identified, the large sample size allows for the assessment of their range of variation and accurate identification, without the benefit of comparable material of this age. Multivariate statistics, including a principal component analysis and a canonical variate analysis, provide reasonable separation of all taxa, although better results are achieved by separate analyses based on qualitative observations of denticle shape. The best results of the canonical variate analysis identified 96.0% of specimens correctly. This corroborates the qualitative identification of specimens and illustrates a valid way of evaluating diversity in areas and formations from which no described jaw material is known.

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