сетчатая эволюция

Natural polyploidy in reptiles

Authors: Litvinchuk S. N.

Natural polyploidy cases in reptiles are analyzed. They are characterized by spontaneous autotriploidy, non-hybrid mixoploidy (2/3n), hybrid biotypes (2 and 3n), polyploid species, and tetraploid hybrids obtained from crossing triploids with diploids. Polyploid species are always triploid and parthenogenetic. Neither gynogenesis nor various types of hemiclonal inheritance have been observed among them. In all cases studied, reticulate speciation in reptiles stops at the stage associated with tetraploidy.

Ecological niches breadth analysis of Darevskia (Lacertidae, Reptilia) parthenogenetic lizards with various scenarios of clonal lineage formation in populations

Authors: Osipov F. A., Bobrov V. V., Dergunova N. N., Arakelyan M. S., Petrosyan V. G.

In this work, we tested the conditions for fulfilling the concept of geographic parthenogenesis by a comparative analysis of the breadth of the ecological niches of parental and parthenogenetic lizards of the genus Darevskia with a various number of established hybridization events. Estimates of the breadth of ecological niches of the parthenogenetic species D. rostombekowi Nb = 0.6(±0.08) and parental bisexual species D.