Multivariate statistics

Comparison of methods for estimates of molecular genetic diversity in genus Croton: influence of coefficients, clustering strategies and data projection

M. M. Scaldaferri, Freitas, J. S., Vieira, J. G. P., Gonçalves, Z. S., Souza, A. M., and Cerqueira-Silva, C. B. M., Comparison of methods for estimates of molecular genetic diversity in genus Croton: influence of coefficients, clustering strategies and data projection, vol. 13. pp. 5566-5573, 2014.

We investigated 10 similarity (and disimilarity) coefficients in a set of 40 wild genotypes of Croton linearifolius subjected to analyses using hierarchical grouping methods, grouping methods by optimization and data projection in two-dimensional space. Genotypes were characterized by analyzing DNA polymorphism with the use of 15 ISSR and 12 RAPD markers. The distance measurements were compared by the Spearman correlation test, projection in two-dimensional space and grouping efficiency evaluation.

Comparison of efficiency of distance measurement methodologies in mango (Mangifera indica) progenies based on physicochemical descriptors

E. O. S. Alves, Cerqueira-Silva, C. B. M., Souza, A. M., Santos, C. A. F., Neto, F. P. Lima, and Corrêa, R. X., Comparison of efficiency of distance measurement methodologies in mango (Mangifera indica) progenies based on physicochemical descriptors, vol. 11. pp. 591-596, 2012.

We investigated seven distance measures in a set of observations of physicochemical variables of mango (Mangifera indica) submitted to multivariate analyses (distance, projection and grouping). To estimate the distance measurements, five mango progeny (total of 25 genotypes) were analyzed, using six fruit physicochemical descriptors (fruit weight, equatorial diameter, longitudinal diameter, total soluble solids in °Brix, total titratable acidity, and pH).

Rapid morphological changes in populations of hybrids between Africanized and European honey bees

T. M. Francoy, Gonçalves, L. S., and De Jong, D., Rapid morphological changes in populations of hybrids between Africanized and European honey bees, vol. 11, pp. 3349-3356, 2012.

African honey bees, introduced to Brazil in 1956, rapidly dominated the previously introduced European subspecies. To better understand how hybridization between these different types of bees proceeded, we made geometric morphometric analyses of the wing venation patterns of specimens resulting from crosses made between Africanized honey bees (predominantly Apis mellifera scutellata) and Italian honey bees (A. mellifera ligustica) from 1965 to 1967, at the beginning of the Africanization process, in an apiary about 150 km from the original introduction site.

Comparison of coefficients and distance measurements in passion fruit plants based on molecular markers and physicochemical descriptors

C. B. M. Cerqueira-Silva, Cardoso-Silva, C. B., Conceição, L. D. H. C. S., Nonato, J. V. A., Oliveira, A. C., and Corrêa, R. X., Comparison of coefficients and distance measurements in passion fruit plants based on molecular markers and physicochemical descriptors, vol. 8, pp. 870-879, 2009.

We investigated seven distance measures and 14 simi­larity coefficients in a set of observations of variables of the ‘yellow’ passion fruit plant (Passiflora edulis Sims), submitted to multivari­ate analyses (distance, projection and grouping). Fourteen genotypes were characterized, based on DNA amplification with 16 random am­plified polymorphic DNA primers and the assessment of nine fruit physical-chemical descriptors.

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