1. Reinforcement favoring reproductive isolation is required for both parapatric and sympatric speciation . 2. A number of models have been proposed for alternative modes of sympatric speciation . 3. They also state that under this definition, sympatric speciation seems plausible. 4. A 2008 study suggests that sympatric speciation has occurred in Tennessee cave salamanders. 5. Sympatric speciation is one of three traditional geographic categories for the phenomenon of speciation.6. Lod?argues that evolutionary divergences resulting from sexual conflict could lead to sympatric speciation . 7. However, the existence of sympatric speciation as a mechanism of speciation remains highly debated. 8. In sympatric speciation , there is no geographic constraint to interbreeding. 9. Sympatric speciation is defined as the evolution of a new species without geographical isolation.10. "Monostroma latissimum ", a marine green algae, also shows sympatric speciation in southwest Japanese islands.
