Organisms that have ecologically similar sexual and asexual forms present an evolutionary puzzle, as theory predicts that eventually one form should eliminate the other. However, both forms may persist if there is niche partitioning between them. Geographical parthenogenesis is a hypothesis that predicts that in terms of niche use the asexual form in such pairs should be more ecologically succe...

background: mastalgia is a common problem among women. severe mastalgia can have a negative impact on sexual, physical and sleep activities and behaviors. regarding the absence of a study on the prevalence and severity of mastalgia in southern iran, the current study was conducted.   methods: this is an analytical cross-sectional study. the participants were women who referred to health centers...

Pristimantis reichlei is a widely distributed species, occurring in the Amazonian forests of Bolivia, Peru and Brazil. However, little information available on its natural history or breeding biology. Here we document for first time parental care clutch size this species. Parthenogenesis presumed.

Several hypotheses were proposed to account for geographic parthenogenesis that is the disjointed distribution of a species’ sexual and asexual forms. In the areas affected by glaciations the parthenogenetic forms would have had ecological success and hybridization and polyploidy would have been the driving forces in their success. Limnocythere inopinata is well-represented in Quaternary non-ma...