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795 results for “fluctuations”
Estimating the transfer rates of bacterial plasmids with an adapted Luria–Delbrück fluctuation analysis
<p>This repository accompanies the publication of <strong><em>Estimating the rate of plasmid transfer with an adapted Luria–Delbrück fluctuation analysis</em></strong> by Kosterlitz et. al. to provide a consolidated and accessible way of viewing the source data, figures, and custom programs.</p>
Distribution. Endemic to Fennoscandia, specifically to the Scandinavian Peninsula (Norway and N & W Sweden), N Finland, and Kola Peninsula (NW Russia); S border fluctuates ¢.200 km, shifting S during cyclic peaks. in Cricetidae
Distribution. Endemic to Fennoscandia, specifically to the Scandinavian Peninsula (Norway and N & W Sweden), N Finland, and Kola Peninsula (NW Russia); S border fluctuates ¢.200 km, shifting S during cyclic peaks.
Data from: Mechanism matters: the cause of fluctuations in boom-bust populations governs optimal habitat restoration strategy
Many populations exhibit boom-bust dynamics in which abundance fluctuates dramatically over time. Past research has focused on identifying whether the cause of fluctuations is primarily exogenous, e.g., environmental stochasticity coupled with weak density dependence, or endogenous, e.g., over-compensatory density dependence. Far fewer studies have addressed whether the mechanism responsible for boom-bust dynamics matters with respect to at-risk species management. Here, we ask whether the best strategy for restoring habitat across a landscape differs under exogenously versus endogenously driven boom-bust dynamics. We used spatially explicit individual-based models to assess how butterfly populations governed by the two mechanisms would respond to habitat restoration strategies that varied in the level of resource patchiness – from a single large patch to multiple patches spaced at different distances. Our models showed that the restoration strategy that minimized extinction risk and boom-bust dynamics would be markedly different depending on the governing mechanism. Exogenously governed populations fared best in a single large habitat patch, whereas for endogenously driven populations, boom-bust dynamics were dampened and extinction risk declined when the total restored area was split into multiple patches with low to moderate inter-patch spacing. Adding environmental stochasticity to the endogenous model did not alter this result. Habitat fragmentation lowered extinction risk in the endogenously driven populations by reducing their growth rate, precluding both "boom" phases and, more importantly, "bust" phases. Our findings suggest that: 1) successful restoration will depend on understanding the causes of fluctuations in at-risk populations; 2) the level and pattern of spatiotemporal environmental heterogeneity will also affect the ideal management approach; and 3) counter-intuitively, for at-risk species with endogenously governed boom-bust dynamics, lowering the intrinsic population growth rate may decrease extinction risk.
Data from: Soil CO2 and O2 concentrations illuminate the relative importance of weathering and respiration to seasonal soil gas fluctuations
[No abstract entered]
Data from: Implications of landscape evolution and climate fluctuation on bird species diversification in Neotropics
<p>Among several factors proposed as drivers of species diversification in the American tropics, the riverine barriers hypothesis plays a central role in Amazonian biogeography, being observed in many species. Although the hypothesis has great evolutionary importance, some species deviate from the expected biogeographic pattern. Their evolutionary histories are better explained when considering climatic oscillations or joint action of climatic fluctuations and river dynamics. Here, we used reduced representation genome sequencing and species distribution models to better understand the implications of landscape dynamics and climate shifts on species diversification in the Neotropics. The blue-crowned Manakin (Lepidothrix coronata) has one of the widest distributions amongst Manakin, with remarkable phenotypic variation across its distribution, thus an excellent model for this sort of study. We found evidence for the existence of four, geographically structured, evolutionarily independent lineages that diverged close to the Pliocene-Pleistocene boundary. Despite distribution models indicating habitat suitability crossing the rivers, we found no evidence of gene flow between the lineages, suggesting that the diversification process was mainly triggered by vicariant events, such as the establishment of the Amazonian rivers and the rise of the northern Andes.</p>
Arms-race and fluctuating-selection dynamics in Pseudomonas aeruginosa bacteria coevolving with phage OMKO1
<p class="MsoNormal">Experimental evolution studies have examined coevolutionary dynamics between bacteria and lytic phages, where two models for antagonistic coevolution dominate: arms-race dynamics (ARD) and fluctuating-selection dynamics (FSD). Here, we tested the ability for <em>Pseudomonas aeruginosa </em>to coevolve with phage OMKO1 during 10 passages in the laboratory; whether ARD versus FSD coevolution occurred; and how coevolution affected a predicted phenotypic trade-off between phage resistance and antibiotic sensitivity. We used a unique "deep" sampling design, where 96 bacterial clones per passage were obtained from the three replicate coevolving communities. Next, we examined phenotypic changes in growth ability, susceptibility to phage attack, and resistance against antibiotics. Results confirmed that the bacteria and phages coexisted throughout the study with one community undergoing ARD while the other two showed evidence for FSD. Surprisingly, only the ARD bacteria demonstrated the anticipated trade-off. Whole genome sequencing revealed that treatment populations of bacteria accrued more <em>de novo</em> mutations, relative to a control bacterial population. Additionally, coevolved bacteria presented mutations in genes for biosynthesis of flagella, type-IV pilus and lipopolysaccharide, with three mutations fixing contemporaneously with the occurrence of the phenotypic trade-off in the ARD-coevolved bacteria. Our study demonstrates that both ARD and FSD coevolution outcomes are possible in a single interacting bacteria-phage system, and that occurrence of predicted phage-driven evolutionary trade-offs may depend on the genetics underlying evolution of phage-resistance in bacteria. These results are relevant for the ongoing development of lytic phages, such as OMKO1, in personalized treatment of human patients, as an alternative to antibiotics. </p>
Data for critical fluctuations in a confined driven-dissipative quantum condensate
<p>All the raw data sets collected for this project are included in this submission. 'Readme.text' files are included with the data sets explaining what the data sets are and how to read them. </p> <p>We divided the real space data into 8 diifferent files for uploading purposes. We had trouble uploading it as a single file due to the large file size so we divided the data into 8 different files. </p> <p>Files real_space_data_1,real_space_data_2, real_space_data_3, real_space_data_4, real_space_data_5, real_space_data_6,real_space_data_7 and real_space_data_8 are a SINGLE data set. </p>
Spatial and seasonal fluctuations in fresh submarine groundwater discharge revealed by marine continuous resistivity profiling
<p>MCRP, Piezometric level Seawater, Radium isotope activities, Seawater salinity profiles (Mataró, Spain)</p>
Dataset for the manuscript "pH drives electron density fluctuations that enhance electric field-induced liquid flow"
Open the record for dataset details and reuse information.
Records of chemical weathering and plateau saline lake sediments linked to paleoclimate fluctuations during the Eocene
Open the record for dataset details and reuse information.
Data used in the publication "High Energy Emissions induced by air density fluctuations of discharges"
<p>This data was used to generate the Figures in the publication "High Energy Emissions induced by air density fluctuations of discharges".</p>
Data used in "Persistent multi-scale fluctuations shift European hydroclimate to its millennial boundaries"
<p>Data used for evaluation of "Persistent multi-scale fluctuations shift European hydroclimate to its millennial boundaries"</p>
Data for "Mobility enhancement in graphene by in situ reduction of random strain fluctuations"
<p>Data for "Mobility enhancement in graphene by in situ reduction of random strain fluctuations"</p>
Fig. 4 Afroanthracites males. a A in Topography and climatic fluctuations boosting speciation: biogeography and a molecular phylogeny of the East African genera Afroanthracites Hemp & Ingrisch and Afroagraecia Ingrisch & Hemp (Orthoptera, Tettigoniidae, Conocephalinae, Agraeciini)
Fig. 4 Afroanthracites males. a A. montium from the Mounts Kilimanjaro/Meru area. b A. usambariucs, West Usambara Mountains. c A. lutindi, Lutindi forest reserve, West Usambara Mountains. d A. viridis, East Usambara Mountains. e A. pseudodiscolor, Lutindi reserve. f A. discolor, Mazumbai forest reserve, West Usambara Mountains
Fig. 2 in Topography and climatic fluctuations boosting speciation: biogeography and a molecular phylogeny of the East African genera Afroanthracites Hemp & Ingrisch and Afroagraecia Ingrisch & Hemp (Orthoptera, Tettigoniidae, Conocephalinae, Agraeciini)
Fig. 2 Relationships among species of Afroanthracites and Afroagraecia inferred from both Bayesian and likelihood analysis based on the 16S rRNA-H3
FIGURE 5 in Seasonal Fluctuation In The Population Of Harmonia Axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) And Co-Occurrence With Other Coccinellids In The Federal District Of Brazil
FIGURE 5: Diversity profile of coccinellid communities collect- ed among organic vegetable crops in two regions of the Federal District.
FIGURE 1 in Seasonal Fluctuation In The Population Of Harmonia Axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) And Co-Occurrence With Other Coccinellids In The Federal District Of Brazil
FIGURE 1: Coloration patterns of Harmonia axyridis collected in the region of the Federal District, Brazil. The scale bar above the photos of the specimens corresponds to 4 mm.
FIGURE 4 in Seasonal Fluctuation In The Population Of Harmonia Axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) And Co-Occurrence With Other Coccinellids In The Federal District Of Brazil
FIGURE 4: Estimated richness of species or genera of the coccinellid community through rarefaction curves in vegetable crops in two regions of the Federal District.
FIGURE 3 in Seasonal Fluctuation In The Population Of Harmonia Axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) And Co-Occurrence With Other Coccinellids In The Federal District Of Brazil
FIGURE 3: Seasonal variation in the population of Harmonia axyridis and other coccinellid (Cycloneda sanguinea, Hippodamia convergens, Eriopis connexa, Scymnus spp. Azya luteipes, Hyperaspis festiva, Olla v-nigrum and Psyllobora sp.) collected in an area of vegetable intercropping in organic systems from February 2009 to January 2010 in Taguatinga, Federal District.
FIGURE 2 in Seasonal Fluctuation In The Population Of Harmonia Axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) And Co-Occurrence With Other Coccinellids In The Federal District Of Brazil
FIGURE 2: Seasonal pattern of rainfall distribution and variation in mean maximum and minimum temperatures in the Federal District, (A) 2008 and (B) 2009.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.