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1,068 results for “demographic”
Demographic rates of 165 tree species in a moist tropical forest
<p>Mortality, recruitment and growth rates of 165 tree species on Barro Colorado Island from 1990 to 2014. The demographic rates are calculated based on the BCI (Barro Colorado Island) plot data. For more information on the BCI plot data, please see https://doi.org/10.15146/5xcp-0d46 (Condit et al., 2019). Reference: Condit, R. et al. (2019). Complete data from the Barro Colorado 50-ha plot: 423617 trees, 35 years, Dryad, Dataset, https://doi.org/10.15146/5xcp-0d46. For more information on the calculation of demographic rates, please see https://doi.org/10.1111/1365-2435.14424.</p>
Data from: Demographically explicit scans for barriers to gene flow using gIMble
<p>Identifying regions of the genome that act as barriers to gene flow between recently diverged taxa has remained challenging given the many evolutionary forces that generate variation in genetic diversity and divergence along the genome, and the stochastic nature of this variation. Here we implement a composite likelihood approach for the quantification of barriers to gene flow. This analytic framework captures background selection and selection against locally maladaptive alleles (i.e. genomic barriers) in a model of isolation with migration (IM) as heterogeneity in effective population size (Ne) and effective migration rate (me), respectively. Variation in both effective demographic parameters is estimated in sliding windows via pre-computed likelihood grids. We have implemented genomewide IM blockwise likelihood estimation (gIMble) as a modular tool, which includes modules for pre-processing/filtering of genomic data and performing parametric bootstraps using coalescent simulations. To demonstrate the new approach, we analyse data from a well-studied sister species pair of tropical butterflies with a known history of post-divergence gene flow: Heliconius melpomene and H. cydno. Our analysis uncovers both large effect barrier loci (including well-known wing-pattern genes) and a genome-wide signal of polygenic barrier architecture.</p>
Supplementary data for: "The demographic history of the wild crop relative Brachypodium distachyon is shaped by distinct past and present ecological niches"
<p>Supplementary data to https://doi.org/10.1101/2023.06.01.543285</p>
Population genomic analyses reveal hybridization and marked differences in genetic structure and demographic history of Scurria limpet sister species with parapatric distributions across the southeastern pacific
<p>The study of sister species that occur in parapatry around biogeographic transition zones can help understand the evolutionary processes that underlie the changes in species composition across biogeographic transition zones. The South Eastern Pacific (SEP) coast is a highly productive coastal system that exhibits a broad biogeographic transition zone around 30–35ºS. Here, we present a comparative genome-wide analysis of the sister species <em>Scurria viridula</em> and <em>Scurria zebrina</em>, that occur in parapatry and whose poleward and equatorward range edges intersect in the 30–35ºS SEP biogeographic transition zone. We sampled 118 specimens sourced from nine sites from Tocopilla (22ºS) to Chiloé (41ºS) including one site where both species overlap and analyzed over 8,000 biallelic single nucleotide polymorphisms. We found evidence of hybridization between these species in the contact zone and found significant but contrasting population structures for both species. Our results indicate that the genetic structure in <em>S. viridula</em>, which is currently expanding its range poleward, follows a simple isolation-by-distance model with no traces of natural selection (no evidence of outlier loci). In contrast, <em>S. zebrina</em>, which finds its equatorward range edge at the transition zone, displayed a pronounced genetic break approximately at 32-34ºS, along a region of marked environmental heterogeneity in association with a semi-permanent coastal upwelling regime. For <em>S. zebrina</em>, we also found 43 outlier loci associated with this genetic break, with a significant proportion of them clustering in a single linkage group. This marked difference in the presence of outlier loci between species suggests that they could be responding differently to local environmental challenges found at their overlapping geographic range edges, thus providing important new insights about genomic changes around biogeographic transition zones in sister species and the forces that shape genetic diversity in intertidal marine species. </p>
Genotype data for: Demographic and genetic consequences of a steelhead supplementation program
<p>Supplementation of naturally-spawning populations by the addition of hatchery-spawned individuals is commonly conducted for recovery of threatened and endangered populations and to support harvest opportunities. We present an analysis of steelhead, the anadromous form of Rainbow Trout (<em>Oncorhynchus</em> <em>mykiss</em>), returning to an integrated supplemented population in Southwest Washington over the course of 15 years. The goal of the supplementation program was to evaluate whether use of a juvenile captive broodstock and an integrated paradigm could be used to increase adult returns while avoiding negative genetic impacts to the population. Estimates of relative reproductive success (RRS) for fish spawned in the hatchery ranged from 2.4 for hatchery-origin females to 6.4 for natural-origin males, indicating that fish spawned in the hatchery produced more returning adult progeny than did fish allowed to spawn in the natural environment. We observed a slight reduction in reproductive success (RS) for hatchery-origin (relative to natural-origin) fish when spawning in the natural environment, but the difference was non-significant for males and marginally significant for females. In contrast to the relatively weak relationship between RS and origin (male P = 0.347, η<sup>2</sup> = 0.008; female P = 0.066, η<sup>2</sup> = 0.037), we observed a strong relationship between RS and return year (male P < 0.001, η<sup>2</sup> = 0.896; female P < 0.001, η<sup>2</sup> = 0.867) (i.e., hatchery- and natural-origin fish did well or poorly together each year). Hatchery-origin fish exhibited reduced genetic diversity, as well as evidence of increased temporal population structure among hatchery fish. We suspect the latter is an artifact of cultural practices that reduce diversity in age at smoltification. We conclude that the program was successful in achieving an increase in adult return, but not in avoiding negative genetic effects on the population, and that any lasting impacts of supplementation remain to be determined.</p>
Single-arm Trial of BIBW 2992 (Afatinib) in Demographically and Genotypically Selected NSCLC Patients
ClinicalTrials.gov study NCT00730925. IPD Sharing: Not stated. Countries: 2. Publications: 1.
Wildfire alters the disturbance impacts of an emerging infectious disease via changes to host occurrence and demographic structure
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Demographic modelling helps tracking the rapid and recent divergence of a conifer species pair from central Mexico
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Data from: A hierarchical population model for the estimation of latent prey abundance and demographic rates of a nomadic predator
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Data from: Investigating the spatial, demographic, and genetic structures of Cylicodiscus gabunensis Harms, a light-demanding African timber species
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Data from: Demographic costs and benefits of natural regeneration during tropical forest restoration
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Data from: Are skyline plot-based demographic estimates overly dependent on smoothing prior assumptions?
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Data from: How climate extremes—not means—define a species' geographic range boundary via a demographic tipping point
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Multilocus evidence provides insight into the demographic history and asymmetrical gene flow between Ostrinia furnacalis and Ostrinia nubilalis (Lepidoptera: Crambidae) in the Yili area, Xinjiang, China
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Data from: Demographic compensation does not rescue populations at a trailing range edge
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Biogeographic barriers and historical climate affect phylogeographic structure and demographic history of the common gartersnake
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Data from: Behavioral modifications lead to disparate demographic consequences in two sympatric species
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Data from: Demographic model selection using random forests and the site frequency spectrum
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Water availability dictates how plant traits predict demographic rates
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Dissimilar climatic niche is predictive of contrasting historical demographic changes and altitudinal shifts in related oak species (<em>Quercus</em>)
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Allen Brain Atlas
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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.