A multivariate morphometric study and revision of Aster subg. Doellingeria sect. Triplopappus (Compositae: Astereae): the Aster umbellatus complex

Abstract

A multivariate morphometric study of Aster subg. Doellingeria sect. Triplopappus (Compositae: Astereae) was undertaken to assess the numbers and ranks of taxa that usefully could be recognized. The results of cluster, discriminant, and principal components analyses on a matrix of 362 plants by 11 characters indicated that four species level groups can be recognized: Aster inflrmus, A. reticulatus, A. sericocarpoides, and A. umbellatus. Within A. umbellatus, analyses of a 12-character data matrix on an additional 140 plants and analysis of a second matrix consisting of the data on the 198 plants of the species included in the species-level study supported recognition of two varieties: pubens and umbellatus. The qualitative and quantitative differences between the two varieties were smaller than those among the four species. Using a key to the taxa produced from all results, the distributions of the four species and two varieties were determined from a large sample of herbarium specimens and a nomenclatural synonymy was developed. Some lectotypes and a neotype are designated. All taxa in the section are diploid 2n = 18; chromosome numbers for 42 individuals of A. umbellatus are reported for the first time. Key words: Aster, Doellingeria, Triplopappus, multivariate morphometric study, Aster umbellatus, key.

Habitat discrimination of big-scale sand smeltAtherina boyeriRisso, 1810 (Atheriniformes: Atherinidae) in eastern Algeria using somatic morphology and otolith shape

“…Also, a primary test was applied to test the influence of sex where a Factorial Discriminant Analysis (FDA) considering sex in each sample was applied. The FDA, which helps to better discriminate samples of the same or of different species (Semple et al 1991), was performed using the SPSS software version 13 (SPSS 2004). Using Ward's method, a hierarchical clustering was performed with the FactoMineR package with R ® software (R Core Team 2014).…”

Some Marine Tunisian Atherina boyeri Populations (Teleostei) have Morphological and Molecular Characteristics of Lagoon Fishes

“…Several morpho-anatomical parameters were examined, i.e., 10 cephalic, 28 body and 40 body-cephalic ratios and 9 meristic parameters (detailed in [20]). For multivariate analyses Canonical Discrimination Analysis (CAN-DISC) was applied [22]. Ordination of individual samples was defined by the variable canonical components taken two by two [23].…”

Diversité génétique de quelques populations naturelles de Medicago ciliaris (L) Krock et de Medicago intertexta (L) Mill. I. Analyse de la variabilité morphologique

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