Waves of parthenogenesis in the desert: evidence for the parallel loss of sex in a grasshopper and a gecko from Australia.
The rarity of parthenogenesis, reproduction without sex, is a major evolutionary puzzle. To understand why sexual genetic systems are so successful in nature, we must understand why parthenogenesis sometimes evolves and persists. Here we use DNA sequence data to test for similarities in the tempo and mode of the evolution of parthenogenesis in a grasshopper and a lizard from the Australian desert. We find spectacular congruence between genetic and geographic patterns of parthenogenesis in these distantly related organisms. In each species, parthenogenesis evolved twice and appears to have expanded in parallel waves across the desert, suggesting a highly general selective force against sex.
Kearney
Michael
M
Department of Zoology, Centre for Environmental Stress and Adaptation Research, The University of Melbourne, Parkville, Victoria 3010, Australia. mrke@unimelb.edu.au
Blacket
Mark J
MJ
Strasburg
Jared L
JL
Moritz
Craig
C
D000818:Animals; D001315:Australia; D005075:Biological Evolution; D003889:Desert Climate; D005843:Geography; D006110:Grasshoppers / Q000235:genetics / Q000502:physiology*; D008116:Lizards / Q000235:genetics / Q000502:physiology*; D008969:Molecular Sequence Data; D010312:Parthenogenesis / Q000235:genetics*; D010802:Phylogeny; D012641:Selection, Genetic; D017422:Sequence Analysis, DNA; D012726:Sexual Behavior, Animal