We have studied an agent model which presents the emergence of sexual barriers through the onset of assortative mating, a condition that might lead to sympatric speciation. In the model, individuals are characterized by ...

We investigated dispersal patterns of Drosophila larvae searching for pupation sites over three substrates to determine the role of spatial heterogeneity and presence of other species on prepupation behavior. We used D. ...

Ninety individuals of the characid fish Astyanax fasciatus (Cuvier, 1819) were collected at Agua da Madalena stream (Botucatu, São Paulo, Brazil) and analyzed for diploid chromosome number 2n and karyotype composition as ...

Ninety individuals of the characid fish Astyanax fasciatus (Cuvier, 1819) were collected at Agua da Madalena stream (Botucatu, São Paulo, Brazil) and analyzed for diploid chromosome number 2n and karyotype composition as ...

Ninety individuals of the characid fish Astyanax fasciatus (Cuvier, 1819) were collected at Água da Madalena stream (Botucatu, São Paulo, Brazil) and analyzed for diploid chromosome number 2n and karyotype composition as ...

The tiger beetle genus Pseudoxycheila (Cicindelidae) currently contains 21 species, distributed in mid and high elevations in the Andes from Bolivia to Venezuela and in mountains in Panama and Costa Rica. The center of ...