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.