No two species in the same group are sympatric, but members of different groups are sympatric in at least parts of their ranges.
Consequently, in some areas it is sympatric with S. cyanosticta and phaeota.
We postulate that these differences evolved to support the reproductive isolation of the sympatric species.
Cases of sympatric existence of two subspecies of one species are known in birds and in reptiles.
Field work in Michoacn revealed that two supposed subspecies of Pituophis deppei were sympatric.
Today, sympatric species have different breeding habits and breeding calls which reinforce the differences in morphology.
It is not known for certain that melanonotus and occidentalis are sympatric.
Southern pygmy mice at high altitudes average larger than those from low elevations, except where the two species are sympatric.
Regardless of their respective breeding habits, sympatric species have calls that differ notably.
Trionyx ferox in the northern part of its range is sympatric with T. spinifer asper.
Occupying the same or overlapping geographic areas without interbreeding. Although they share the same geographic range, sympatric populations of related organisms become isolated from each other reproductively. This can happen by the development of subpopulations that become dependent on distinct food sources or that evolve distinct seasonal mating behavior. Flowering plants frequently become reproductively isolated through the development of polyploid hybrids (hybrids with three or more sets of chromosomes) that cannot backcross with either parent. ◇ The development of new species as a result of the reproductive isolation of populations that share the same geographic range is called sympatric speciation. Compare allopatric.