Rates of nucleotide substitution in sexual and anciently asexual rotifers
نویسندگان
چکیده
منابع مشابه
Spatial and temporal escape from fungal parasitism in natural communities of anciently asexual bdelloid rotifers.
Sexual reproduction is costly, but it is nearly ubiquitous among plants and animals, whereas obligately asexual taxa are rare and almost always short-lived. The Red Queen hypothesis proposes that sex overcomes its costs by enabling organisms to keep pace with coevolving parasites and pathogens. If so, the few cases of stable long-term asexuality ought to be found in groups whose coevolutionary ...
متن کاملAnciently asexual bdelloid rotifers escape lethal fungal parasites by drying up and blowing away.
Asexuality has major theoretical advantages over sexual reproduction. An important evolutionary puzzle, therefore, is why exclusively asexual metazoan lineages rarely endure. The Red Queen hypothesis posits that asexuality is rapidly extinguished by relentlessly coevolving parasites and pathogens. If so, any long-lasting asexual lineage must have unusual alternative mechanisms to deal with thes...
متن کاملIndependently Evolving Species in Asexual Bdelloid Rotifers
Asexuals are an important test case for theories of why species exist. If asexual clades displayed the same pattern of discrete variation as sexual clades, this would challenge the traditional view that sex is necessary for diversification into species. However, critical evidence has been lacking: all putative examples have involved organisms with recent or ongoing histories of recombination an...
متن کاملSexual Species Are Separated by Larger Genetic Gaps than Asexual Species in Rotifers
Why organisms diversify into discrete species instead of showing a continuum of genotypic and phenotypic forms is an important yet rarely studied question in speciation biology. Does species discreteness come from adaptation to fill discrete niches or from interspecific gaps generated by reproductive isolation? We investigate the importance of reproductive isolation by comparing genetic discret...
متن کاملEstimation of nucleotide substitution rates in Eurotiomycete fungi.
In the entire fungal kingdom, only DNA substitution rates in the SSU rRNA gene (Berbee and Taylor 1993, 2001) and amino acid substitution rates (Heckman et al. 2001) have been estimated and used to date fungal divergences. However, these molecules are not sufficiently variable to date events at or below the genus level. DNA sequences of protein-coding genes and the internal transcribed spacer (...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2001
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.111144598