Atributos reprodutivos de peixes da bacia do rio São Francisco e implicações filogenéticas

Abstract

In the present study there are presented the reproductive attributes of 12 species from São Francisco river basin, obtained through the hipophysation and manual fertilization of the oocytes. Later the registered data were added to more 23 species, totalizing 35 species. The total data were submitted to the clustering analysis resulting in groups with recognized phylogenetic proximities. The principal component analysis were applied to quantitative and categorical variables resulting in the formation of two great dissimilary groups: one formed by species that presented similar atributtes in relation to the length of the larva newly hatched LTL ,to the adhesiveness of the eggs ADESIOV, to the low relatively fecundity FRG, to the absence of larval movements MOVELAR and to high values for the hatch in hourdegree TE. The other group was formed by species that presented similar atributtes in relation to the total length of females LT, to the absolute fecundity FA, to the presence of larval adhesive organ and vertical larval movements in the water, ADESILAR and MOVELAR, respectively. It is argumented that these two basic reproductive patterns are the polar principles of the different conditions of the qualitative and quantitative reproductive characters that they are so close as more proximities among the species, with rare exception as the Pseudopimelodidae . It was possible to do inferences about the condition of the in Characiformes, Siluriformes and Gymnotiformes, that had your origin, in hypothesis, from nest protoguardadores.