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12 results for “facultative sexuals”
Data from: What ecological factors favor parthenogenesis over sexual reproduction? A study on the facultatively parthenogenetic mayfly Alainites muticus in natural populations
<p>Different reproductive modes are characterized by costs and benefits which depend on ecological contexts. For example, sex can provide benefits under complex biotic interactions, while its costs increase under mate limitation. Furthermore, ecological contexts often vary along abiotic gradients. Here, we study how these factors simultaneously influence the frequency of sex in the facultatively parthenogenetic mayfly Alainites muticus . We first verified that parthenogenesis translates into female-biased population sex ratios. We then measured the density of individuals (a proxy for mate limitation) and community diversity (biotic interaction complexity) for 159 A. muticus populations covering a broad altitudinal gradient and used structural equation modeling to investigate their direct and indirect influences on sex ratios. We found no effect of community diversity or altitude on sex ratios. Furthermore, even when females can reproduce parthenogenetically, they generally reproduce sexually, indicating that the benefits of sex exceed its costs in most situations. Sex ratios only become female-biased under low population densities, as expected if mate limitation was the main factor selecting for parthenogenesis. Mate limitation might be widespread in mayflies because of their short adult lifespan and limited dispersal, which can generate strong selection for reproductive assurance and may provide a stepping-stone towards obligate parthenogenesis.</p>
Data from: What ecological factors favor parthenogenesis over sexual reproduction? A study on the facultatively parthenogenetic mayfly Alainites muticus in natural populations
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Can sexual conflict drive transitions to asexuality? Female resistance to fertilization in a facultatively parthenogenetic insect
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Data from: Estimating the number of sexual events per generation in a facultatively sexual haploid population
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Fig. 3 in Phenotypic influences on the reproductive strategy of the facultative sexual rotifer Brachionus rubens (Monogononta)
Fig. 3 Percentage of sexual offspring as a function of their birth rank for three different treatments (food, temperature, and acclimation) and all combinations thereof. Bars in black represent significant deviations from the expected percentage of sexual offspring across a given treatment (continuous line) by falling outside the 95% confidence intervals of this value for that rank (dashed line; lower limit is zero if not visible)
Data from: A potential case of reinforcement in a facultatively sexual unicellular eukaryote
The origin of a new species requires a mechanism to prevent divergent populations from interbreeding. In the classic allopatric model, divided populations evolve independently and accumulate genetic differences. If contact is restored, hybrids suffer reduced fitness and selection may favor traits that prevent mistakes in mating, a process known as reinforcement. This decisive but transient phase is challenging to document and has been reported mostly in macroorganisms. Very little is known about the processes through which new microbial species originate. In particular, it is unclear whether microbial eukaryotes, many of which can reproduce sexually during complex life cycles, speciate in much the same way as do well-studied plants and animals. Using individual cellular mate choice trials, we investigated the mating behavior of sympatric and allopatric woodland populations of the yeast Saccharomyces paradoxus. We find evidence consistent with reinforcement, potentially representing an example of microbial speciation in progress.
Data from: A potential case of reinforcement in a facultatively sexual unicellular eukaryote
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Data from: Sex allocation theory for facultatively sexual organisms inhabiting seasonal environments: the importance of bet-hedging
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Data from: The paradox of obligate sex: the roles of sexual conflict and mate scarcity in transitions to facultative and obligate asexuality
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Data from: Local adaptation of sex-induction in a facultative sexual crustacean: insights from QTL mapping and natural population of Daphnia magna
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Fig. 2 in Phenotypic influences on the reproductive strategy of the facultative sexual rotifer Brachionus rubens (Monogononta)
Fig. 2 Relationship between either the number of asexual offspring (a) or the production of at least one sexual offspring (b) with the lifetime reproduction for all females. The dashed line in a indicates total investment into asexual offspring. In b, the number of individuals with a given lifetime reproduction and producing either sexual (state 1) or asexual (state 0) offspring is represented by the diameter of the filled circle (see insert). Data in b were fitted ignoring the minor influence of food quality and temperature (see Results)
Fig. 1 in Phenotypic influences on the reproductive strategy of the facultative sexual rotifer Brachionus rubens (Monogononta)
Fig. 1 Illustration of the experimental setup
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.