Citogenética em coraciiformes (aves). Primeiro registro cariotípico de megaceryle torquata (alcedinidae)

Abstract

The taxonomic problems have been solved gradually in the group of birds, using molecular, skeletal and behavioral analysis generally. Phylogenetic investigation by cytogenetics is relatively simple, however, only a small fraction of species has its karyotype described, much less using markup differences. Here were described the karyotype of Megaceryle torquata, its pattern of C- and NOR-banding, and also a biometric analysis of the chromosome complement. M. torquata presents a chromosome number 2n = 84, in which the autosomal pairs 1, 3, 4 and 8 are submetacentric, pairs 2 and 5 are metacentric and the pairs 6, 7 and 9 are acrocentric, with the remaining microchromosomes acrocentric. The sex chromosomes Z and W are submetacentric. Positive tags of C-banding can be seen in centromeres of some macro and microchromosomes. The chromosome W showed marks of heterochromatin in centromeric region, the entire short arm and interstitial region of the long arm, the chromosome Z only faint labeling in the centromeric region. The NORs’ bands marked the pericentromeric short arm of pair 6.