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129 results for “Diversity dependence”
Explosive Cenozoic origin and diversity-dependent diversification dynamics shaped the evolution of Australian skipper butterflies
<p><span>Australia was predominantly tropical for most of the early Cenozoic, then transitioned to a cooler and drier climate in the Oligocene. In response to this increasing aridity, some lineages adapted to more xeric ecosystems, contracted, or became restricted to increasingly fragmented mesic refugia, or went extinct. Yet, the lack of macroevolutionary studies at a continental scale precludes a better understanding of Australian biodiversity patterns and processes during the Cenozoic. Here, we infer a robust dated phylogenomic tree for a radiation of Australian endemic butterflies, the Trapezitinae skippers, to test the impact of biotic and abiotic drivers on Cenozoic diversification dynamics in Australia. These butterflies originated during the Eocene (<em>ca</em>. 42 Ma) in the mesic biome of Australia. Trapezitinae exploded in diversity during a cool, dry period in the late Oligocene and early Miocene, then experienced a sharp deceleration in speciation. Xeric ecosystems appear to have been colonized more recently, supporting the hypothesis of arid and semi-arid biomes as evolutionary sinks. Temperature-dependent and phytophagy-dependent diversification models received little support. Instead, we find evidence for diversity-dependent processes with a declining diversification in Trapezitinae likely linked to limited ecological opportunities following a rapid initial burst of diversification.</span></p>
Unraveling the Impact of Thalidomide at Diverse Doses in Transfusion Dependent Beta Thalassemia
ClinicalTrials.gov study NCT06490627. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
Data from: Context-dependent effects of shifting large herbivore assemblages on plant structure and diversity
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Data from: Fungal symbiont effects on dune plant diversity depend on precipitation
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Data from: Can MHC-assortative partner choice promote offspring diversity? A new combination of MHC-dependent behaviors among sexes in a highly successful invasive mammal
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Data from: Direct evidence that density-dependent regulation underpins the temporal stability of abundant species in a diverse animal community
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Data from: Fungal disease incidence along tree diversity gradients depends on latitude in European forests
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Data from: Scale dependence of the diversity–stability relationship in a temperate grassland
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Explosive Cenozoic origin and diversity-dependent diversification dynamics shaped the evolution of Australian skipper butterflies
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Diversity in lac Operon Regulation among Diverse Escherichia coli Isolates Depends on the Broader Genetic Background but Is Not Explained by Genetic Relatedness
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Data from: Iterative adaptive radiations of fossil canids show no evidence for diversity-dependent trait evolution
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Data from: Benefits of increased colonist quantity and genetic diversity for colonization depend on colonist identity
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Data from: The good, the bad and the Ulva: the density dependent role of macroalgal subsidies in influencing diversity and trophic structure of an estuarine community
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Data from: Genetic diversity and divergence among coastal and offshore reefs in a hard coral depend on geographic discontinuity and oceanic currents.
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Data from: Functional diversity loss with increasing livestock grazing intensity in drylands: the mechanisms and their consequences depend on the taxa
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Data from: Functional diversity of phyllostomid bats in an urban-rural landscape: a scale-dependent analysis
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Data from: Impacts of grazing by different large herbivores in grassland depend on plant species diversity
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Undersampling correction methods to control γ-dependence for comparing β-diversity between regions
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Dataset from: Reed bed vegetation structure and plant species diversity depend on management type and the time period since last management by Andersen et al. 2020 Applied Vegetation Science
<p>The dataset behind the paper Reed bed vegetation structure and plant species diversity depend on management type and the time period since last management by Andersen et al. 2020, Applied Vegetation Science, <a href="https://doi.org/10.1111/avsc.12531">https://doi.org/10.1111/avsc.12531</a></p> <p>The data contains information on the vegetation of four reed bed treatments all located within De Østlige Vejler, Denmark:</p> <p>- A 0-year-old harvested reed bed</p> <p>- A 0-year-old cut reed bed (reed stems left behind)</p> <p>- A 3-year-old harvested reed bed</p> <p>- A 25-year-old harvested reed bed</p>
Data from: How reliably can we infer diversity-dependent diversification from phylogenies?
Slowdowns in lineage accumulation in phylogenies suggest that speciation rates decline as diversity increases. Likelihood methods have been developed to detect such diversity dependence. However, a thorough test of whether such approaches correctly infer diversity dependence is lacking. Here, we simulate phylogenetic branching under linear negative diversity-dependent and diversity-independent models and estimate from the simulated phylogenies the maximum-likelihood parameters for three different conditionings – on survival of the birth–death process given the crown age, on tree size (N) and on tree size given the crown age. We report the accuracy of recovering the simulation parameters and the reliability of the model selection based on the χ2 likelihood ratio test. Parameter estimate accuracy: Conditioning on survival given the crown age yields a severe bias of the carrying capacity K towards N and an upward bias of the speciation rate, particularly in clades where diversity-dependent feedbacks are still weak (N « K). Conditioning on N yields an overestimate of K and an underestimate of speciation rate, particularly when saturation has been reached. Dual conditioning yields relatively unbiased parameter estimates on average, but the deviation from the true value for any single estimate may be large. Model selection reliability: The frequency of incorrectly rejecting a diversity-independent model when the simulation was diversity-independent (type I error) differs substantially from the significance level α used in the likelihood ratio test, rendering the likelihood ratio test inappropriate. The frequency of correctly rejecting the diversity-independent model when the simulation was diversity-dependent (power) is larger when the clade is closer to equilibrium and for conditioning on crown age. We conclude that conditioning on crown age has the best statistical properties overall, but caution that parameter estimates may be biased. To assess parameter uncertainty in future studies of diversity dependence on real data, we recommend parametric bootstrapping, examination of the likelihood surface and comparison of estimates across the types of conditioning. To assess model selection reliability, we discourage the use of the χ2 likelihood ratio test or AIC (which are equivalent in this case), but recommend a likelihood ratio test based on parametric bootstrap. We illustrate this method for the diversification of Dendroica warblers.
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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.