Multivariate analysis of hybridizing Cyprinidae from the Kananaskis Reservoirs, Alberta

1980 ◽  
Vol 58 (9) ◽  
pp. 1664-1673 ◽  
Author(s):  
G. A. Butcher
Keyword(s):  
Multivariate Analysis ◽  
Principal Components ◽  
Parental Species ◽  
Morphological Characters ◽  
Rhinichthys Cataractae ◽  
Canonical Variates ◽  
Couesius Plumbeus ◽  
Hybrid Group

Principal components and canonical variates analyses of hybridizing Couesius plumbeus (lake chub) and Rhinichthys cataractae (longnose dace) from Upper and Lower Kananaskis Reservoirs, Alberta, using 21 morphological characters, revealed two parental groups bridged continuously by an intermediate hybrid group. This morphological overlap between the hybrids and the parental species indicates that it is not always possible to positively identify "pure" parental individuals from the Kananaskis. Neither backcross nor hybrid F2 individuals could be identified from the analyses, although the Kananaskis R. cataractae showed effects suggestive of either selection or introgression, relative to known R. cataractae from widespread Alberta localities. Rhinichthys cataractae has also declined in numbers relative to C. plumbeus since last studied in 1961. Couesius plumbeus does not show similar effects suggestive of selection or introgression.

Hybridization between northern redbelly dace (Phoxinus eos) and finescale dace (Phoxinus neogaeus) (Osteichthyes: Cyprinidae) in Alberta

1989 ◽  
Vol 67 (3) ◽  
pp. 579-584 ◽  
Author(s):  
Mrinal K. Das ◽  
Joseph S. Nelson
Keyword(s):  
Principal Components ◽  
Parental Species ◽  
Introgressive Hybridization ◽  
Morphological Characters ◽  
Allopatric Populations ◽  
Canonical Variates ◽  
Female Hybrid ◽  
Hybrid Group

Hybridization between northern redbelly dace (Phoxinus eos) and finescale dace (Phoxinus neogaeus) was studied in Upper Pierre Grey Lake, Alberta. Sympatric parental and hybrid populations were compared with allopatric populations from Cameron Lake and Tay Lake, Alberta. Canonical variates and principal components analyses, using 31 morphological characters, revealed that the two parental groups were bridged by an intermediate all-female hybrid group in Upper Pierre Grey Lake. Hybrids made up approximately 33% of the individuals of the sympatic population. Neither backcross nor hybrid F2 individuals could be identified from the analyses, although the majority of hybrids were morphologically more similar to P. neogaeus than to P. eos. No clear evidence of introgressive hybridization was found in either of the sympatric parental species.

A multivariate analysis of the Pitcairnia palmeri group (Bromeliaceae: Pitcairnioideae)

Phytotaxa ◽  
2018 ◽  
Vol 351 (3) ◽  
pp. 219
Author(s):  
EDITH GONZÁLEZ-ROCHA ◽  
MANUEL ARNOLDO CASTILLO-RIVERA ◽  
ANA ROSA LÓPEZ-FERRARI ◽  
ADOLFO ESPEJO-SERNA
Keyword(s):  
Multivariate Analysis ◽  
Discriminant Analysis ◽  
Principal Components ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Accurate Information ◽  
Cluster Analyses ◽  
Floral Bracts

A multivariate analysis of the Pitcairnia palmeri group are presented. Principal Components and Cluster analyses were performed in order to have more accurate information to delimit the species. The analyses showed that the specimens referred to Pitcairnia palmeri var. longebracteata are clearly delimited, while those identified as P. palmeri var. palmeri, P. colimensis, and P. compostelae have a greater overlap of morphological characters, but remain as separate entities. A discriminant analysis showed that morphological characters used have significant multivariate differences between the taxa (P < 0.0005), and that the most important variables in the differentiation of these taxa are the percentage of floral bracts that exceeds the length of the sepals, the length of the floral bracts, and the length of the peduncle. We conclude that P. palmeri var. longebracteata is clearly a different species, not a variety, therefore is described and illustrated as P. robert-downsii, and that P. palmeri, P. compostelae and P. colimensis maintain their taxonomic status.

Multivariate analysis of edible Asparagus species in Iran by morphological characters

Euphytica ◽  
2015 ◽  
Vol 206 (2) ◽  
pp. 445-457 ◽  
Author(s):  
Seyyed Javad Mousavizadeh ◽  
Mohammad Reza Hassandokht ◽  
Abdolkarim Kashi
Keyword(s):  
Multivariate Analysis ◽  
Morphological Characters

scholarly journals Phenotypic diversity of horse breeds used in sports activities, employing multivariate analysis

2021 ◽  
Vol 19 (1) ◽  
pp. e0401
Author(s):  
Marcos P. G. Rezende ◽  
Julio C. Souza ◽  
Carlos H. M. Malhado ◽  
Paulo L. S. Carneiro ◽  
Johnny I. M. Araujo ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Principal Components ◽  
Phenotypic Diversity ◽  
The Body ◽  
Breeding Programs ◽  
Mato Grosso ◽  
Canonical Variables ◽  
Horse Breeding ◽  
Quarter Horse ◽  
Euclidean Distances

Aim of study: Sports involving horses have notable financial importance. Breeds are evaluated to find the best-suited ones for a specific sport category. Phenotypic diversity using biometric markers was evaluated for Quarter Horse (QH), Arabic (AR), English Thoroughbred (ET), and Brazilian Equestrian (BE) horse breeds.Area of study: Mato Grosso do Sul-Brazil.Material and methods: Lengths, widths, and circumference measures of 268 horses were collected. These measures were used to estimate conformation indexes. The size-free canonical discriminant analysis was used to remove the size effect on the animal's shape. The similarity among breeds (by sex) was evaluated employing multivariate analysis (canonical analysis, MANOVA, principal components, Euclidean distances, and grouping through complete linkage), considering all linear measures and conformation indexes (included in the analysis of principal components).Main results: Four canonical variables (CANs), each one representing an equation to interpret the morpho-functionality of breeds “sustentation”, “structure”, “frame”, and “equilibrium”, were retained. The breeds presented differences when the CANs were simultaneously considered. Differences mainly were the size and the thickness of the body as well as the ability of the animal to move. ET, QH, and BE demonstrate a well-defined biometric profile. These three breeds clustered separately from AR breed.Research highlights: Canonical variables allow to verify the functional aptitudes since the responses were close to conformation indices commonly used as horse skill estimators. The implementation of these variables as selection criteria in horse breeding programs require further studies in larger populations of horses for a confirmation of the present results.

scholarly journals Use of Highly Discriminating Morphological Characters and Isozymes in the Study of Spanish Chestnut Cultivars

2006 ◽  
Vol 131 (6) ◽  
pp. 770-779 ◽  
Author(s):  
Santiago Pereira-Lorenzo ◽  
María Belén Díaz-Hernández ◽  
Ana María Ramos-Cabrer
Keyword(s):  
Principal Component Analysis ◽  
Cluster Analysis ◽  
Multivariate Analysis ◽  
Castanea Sativa ◽  
Principal Component ◽  
Market Value ◽  
Morphological Characters ◽  
Minor Importance ◽  
Breeding Programs ◽  
And Cluster Analysis

Morphological characters (six traits) and isozymes (four systems, five loci) were used to discriminate between Spanish chestnut cultivars (Castanea sativa Mill.) from the Iberian Peninsula. A total of 701 accessions (representing 168 local cultivars) were analyzed from collections made between 1989 and 2003 in the main chestnut growing areas: 31 were from Andalucía (12 cultivars), 293 from Asturias (65 cultivars), 25 from Castilla-León (nine cultivars), four from Extremadura (two cultivars) and 348 from Galicia (80 cultivars). Data were synthesized using multivariate analysis, principal component analysis, and cluster analysis. A total of 152 Spanish cultivars were verified: 58 cultivars of major importance and 94 of minor importance, of which 18 had high intracultivar variation. Thirty-seven cultivars were clustered into 14 synonymous groups. Six of these were from Galicia, one from Castilla-León (El Bierzo), four from Asturias, one from Asturias and Castilla-León (El Bierzo), and two from Asturias, Castilla-León (El Bierzo), and Galicia. The chestnut cultivars from Galicia and Asturias were undifferentiated in genetic terms, indicating that they are not genetically isolated. Overall, chestnut cultivars from southern Spain showed the least variation. Many (58%) of Spanish cultivars produced more than 100 nuts/kg; removing this low market-value character will be a high priority. The data obtained will be of use in chestnut breeding programs in Spain and elsewhere.

scholarly journals Egg production evaluation of laying hens by multivariate analysis

2017 ◽  
Vol 69 (3) ◽  
pp. 676-682
Author(s):  
P.B. Ferreira ◽  
P.R.N. Rorato ◽  
F.C.B. Mello ◽  
B. Bevilaqua ◽  
A. Macedo ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Principal Components ◽  
Egg Production ◽  
Euclidean Distance ◽  
Nearest Neighbors ◽  
Single Linkage ◽  
Linkage Method ◽  
Single Linkage Method ◽  
Highly Correlated ◽  
Santa Maria

ABSTRACT This study aimed to verify the existence of differences between hens from the Barred Plymouth Rock (PRB) breed and White Plymouth Rock (PRW) breed by multivariate analysis of weekly egg production and cumulative during the years of 1998 and 2010, from the Laboratório de Avicultura (LAVIC) of the Departamento de Zootecnia at the Universidade Federal de Santa Maria (UFSM). For the analysis of the univariate and multivariate variance, the experimental design was completely randomized with two treatments (breed) and 299 repetitions of the PRW breed and 350 of the PRB breed. The parameters analyzed were the weekly productions of eggs per bird from the 21st to the 50th week of age (P21, P22, ..., P50) and production of eggs accumulated being from the 21st to the 25th (PA1), 21st to the 30th (PA2), 21st to the 35th (PA3), 21st to the 40th (PA4), 21st to the 45th (PA5) and 21st to 50th (PA6). Analyzes of univariate and multivariate variance were conducted and the comparison of means were made by "T" Student and Wilks respectively (P < 0, 05). Based on the results, an analysis of the principal components was performed with parameters PA1, PA2, PA4, PA5 and PA6. With the average egg production per family accumulated, a cluster analysis using Euclidean distance and single linkage method (nearest neighbors) was performed. The first two principal components meet the total variation in egg production accumulated from the 21st to 25th, 21st to 30th, 21st to 40th, 21st to 45th and 21st to 50th weeks of age. Most of the phenotypic variation of the layers can be explained by the production of eggs accumulated from the 21st until the 40th week of age, and this variable is highly correlated with total egg production. Families from the PRW and PRB breed form seven distinct groups, but homogeneous by the similarity between them. This allows direct crossings between different groups, in the pursuit for heterosis.

Larval stages of the lake chub, Couesius plumbeus

1981 ◽  
Vol 59 (2) ◽  
pp. 218-224 ◽  
Author(s):  
Lee A. Fuiman ◽  
Joan P. Baker
Keyword(s):  
External Morphology ◽  
Caudal Peduncle ◽  
Larval Stages ◽  
Rhinichthys Cataractae ◽  
Couesius Plumbeus

Three collections of Couesius plumbeus eggs were laboratory reared. Larvae were described with emphasis on external morphology. They were characterized by (1) 25 to 30 preanal myomeres, (2) a diagonal row of melanophores across the surface of the breast, and (3) a concentration of melanophores on the distal hypaxial portion of the caudal peduncle. Larval characteristics were compared with those of its breeding associate Rhinichthys cataractae and other sympatic cyprinids which have similarly high preanal myomere counts.

Clinal Variation in Electrophoretic and Morphological Characters between Two Nominal Species of the Genus Pseudomugil (Pisces : Atheriniformes : Pseudomugilidae)

1979 ◽  
Vol 30 (3) ◽  
pp. 375 ◽  
Author(s):  
AJ Hadfield ◽  
V Ivantsoff ◽  
PG Johnson
Keyword(s):  
Principal Components ◽  
Major Part ◽  
Single Species ◽  
Morphological Characters ◽  
Morphological Data ◽  
Nominal Species ◽  
Clinal Variation ◽  
Brackish Waters ◽  
Coastal Species ◽  
Eastern Australia

Electrophoretic and morphological comparisons were made between 14 populations representing the major part of the known range of the nominal fish species, Pseudomugil signifer Kner and Pseudomugil signatus (Gunther), described from the fresh and brackish waters of eastern Australia. Analysis by principal components was used to assess the morphological data. .Clinal variation revealed in 10 morphological characters and at two enzyme loci was found to bridge most of the previously described differences between species. The type material of P. signatus afinis from the Low Isles, Queensland, was re-examined and did not appear to differ morphologically from the coastal species. It is therefore suggested that the populations studied represent a single species Pseudomugil signifer Kner.

A morphometric analysis of hybrid salamanders (genus Ambystoma) and their progenitors on Kelleys Island in Lake Erie

1989 ◽  
Vol 67 (10) ◽  
pp. 2376-2383 ◽  
Author(s):  
Clifford W. Zeyl ◽  
Leslie A. Lowcock
Keyword(s):  
Morphometric Analysis ◽  
Principal Components ◽  
Lake Erie ◽  
Meristic Character ◽  
Discriminant Functions ◽  
Morphometric Characters ◽  
Size And Shape ◽  
Canonical Variates

Six morphometric characters and one meristic character were measured on 96 adult and 88 juvenile Ambystoma from Kelleys Island, where extensive hybridization involves three species. Canonical variates, discriminant functions, and size-constrained principal components analyses showed that A. laterale (represented only in hybrids on Kelleys Island), A. texanum, A. tigrinum, and A. laterale–texanum–tigrinum are distinguishable from each other and from a complex of hybrids involving A. texanum and A. laterale. Within the latter complex, different ploidies are not distinct morphologically. Introgression may explain isolated atypical individuals. Adults differ from juveniles in both size and shape, demonstrating allometry.

scholarly journals Genotype Environment Interaction in Grass Pea (Lathyrus sativusL.) Lines

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
G. B. Polignano ◽  
V. Bisignano ◽  
V. Tomaselli ◽  
P. Uggenti ◽  
V. Alba ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Plant Height ◽  
Seed Yield ◽  
Principal Components ◽  
Environment Interaction ◽  
Grass Pea ◽  
Genotype Environment Interaction ◽  
Marginal Areas ◽  
Different Seasons ◽  
The Stability

Eight grass pea lines grown in three different seasons were evaluated for the stability of seed yield, 100 seeds weight, flowering time, plant height, and biomass. Significant differences existed among years, lines, and lines years interaction for all traits except for 100 seeds weight. Two methods of multivariate analysis cluster and principal components were utilized to determine: firstly, whether a pattern existed among lines in their response across years and secondly to examine the relationships among them. In both analyses, each line was presented as a vector whose elements were given by the performance of lines in each year. The analyses used arranged the lines into groups that were differentiable in terms of performances and stability. Our results provide useful information to aid the choice of grass pea lines in the Mediterranean marginal areas.

Sign in / Sign up

Export Citation Format

Share Document