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- W2029073501 abstract "The high incidence of asexuality in oribatid mites presents an unusual opportunity for examining hypotheses for the maintenance of sex. There is a presumed range in age of asexual species: many oribatid species are phylogenetically clustered, occurring in speciose early-derivative families or genera without sexual species, while others are phylogenetically isolated from other asexual species, occurring in later derivative taxa with sexual congeners. We examined the distribution of oribatid mite reproductive mode in soil of corn fields, grassy and shrub fields, and forests in central New York State (three replicate plots of each type, with 25 samples per plot), to test three ecological predictions from current theory. (1) If overall biotic uncertainty, as generated by competitors and predators, mediates the ecological distribution of oribatid mites, then the proportion of asexual oribatid mites should be negatively correlated with biological diversity; we examine this prediction using literature data as well. (2) If Muller's Ratchet (the stochastic loss of best genotypes, which is independent of environment), mediates the success of asexuality, then no ecological pattern should exist. (3) If general purpose genotypes are characteristic of asexual oribatid mites, their habitat distribution should be broader than that of sexual species. For each plot the level of asexuality was compared to indices of overall biotic diversity, as calculated from the pooled oribatid mite (competitors) and mesostigmatid mite (predator) communities. We found no negative correlation in this relationship in our own data or in the literature analysis of 290 faunal surveys from 50 literature sources, so we reject biotic uncertainty as an important determinant of reproductive mode distribution. When only data on phylogenetically clustered asexuals are considered, there is instead a positive correlation between asexuality and diversity that is not explained. Because of the latter pattern we tentatively reject Muller's Ratchet as the primary factor maintaining reproductive mode in these mites, but cannot reject it for isolated asexual species. Niche breadth in sexual and asexual oribatid mites provides no support for widespread general purpose genotypes but broad patterns in the literature suggest that the idea needs further investigation. Possible complicating or unknown factors that are discussed include historical disturbance in the study area, the relationship between parasitism and general biotic diversity, and the level and source of genetic diversity in asexual oribatid mites." @default.
- W2029073501 created "2016-06-24" @default.
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- W2029073501 date "2006-08-10" @default.
- W2029073501 modified "2023-09-25" @default.
- W2029073501 title "The ecological distribution of reproductive mode in oribatid mites, as related to biological complexity" @default.
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- W2029073501 doi "https://doi.org/10.1007/s10493-006-9016-3" @default.
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