Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
4,157
datasets available to search
ShareScore release 0.9.0
Dataset results
4,157 results for “Survival.”
Atlantic salmon survival at sea: temporal changes that lack regional synchrony
<p>Spatial and temporal synchrony in abundance or survival trends can be indicative of whether populations are affected by common environmental drivers. In Atlantic salmon (<em>Salmo salar</em> L.), return rates to natal rivers have generally been assumed to be affected primarily by shared oceanic conditions, leading to spatially synchronous trends in mortality. Here, we investigate the existence of parallel trends in salmon sea survival, using data on migrating smolts and returning adults from seven Canadian populations presumed to share feeding grounds. We analyse sea survival, using a Bayesian change-point model capable of detecting non-stationarity in time series data. Our results indicate that while salmon have experienced broadly comparable patterns in survival, finer-scale temporal shifts are not synchronous among populations. Our findings are not consistent with the hypothesis that salmon populations consistently share the same mortality-related stressors in the marine environment. Although populations may have shared greater synchrony in survival patterns in the past, this synchrony may be breaking down. It may be prudent to direct greater attention to smaller-scale regional and population-level correlates of survival</p>
Novel code for: Synchrony in adult survival is remarkably strong among common temperate songbirds across France
<p>Synchronous variation in demographic parameters across species destabilizes populations, metapopulations and metacommunities and increases extinction risks. Revealing the processes that synchronize population dynamics across species allows us to identify trans-specific demographic processes that are subject to environmental forcing of overarching importance. Using a Bayesian, hierarchical multi-site, multi-species mark-recapture model, we investigated temporal interspecific synchrony in annual adult local survival across 16 common songbird species across France for the period 2001–2016. Adult annual survival was largely synchronous among species (73% [47–94] of the variation among years was common to all species), despite species differing in ecological niche and life-histories. This result was robust to differences in migratory strategy among species, uneven species sample sizes, and time de-trending. Shared synchrony across migratory strategy suggests that environmental forcing during the 4-month temperate breeding season has large-scale, cross-specific, impacts among songbirds. At a scale ~1000 km, a likely proximate mechanism of synchronization is forcing by weather-driven variation in resources, which, in particular, determines the cost of reproduction. However, the strong interspecific synchrony was not easily explained by a set of a priori defined candidate weather variables, with spring weather variables explaining only 1.4% [0.01–5.5] of synchrony, while the contribution of large-scale winter weather indices may be stronger, but uncertain (12% [0.3–37]). Future research may up-scale these results to community dynamics, to understand compensatory intra- and inter-specific demographic processes that preserve meta-communities from synchronization.</p>
Patch quality and genotype-by-environment interactions shape dispersal and post-settlement survival in a butterfly metapopulation
Active dispersal is driven by extrinsic and intrinsic factors at the three stages of departure, transfer, and settlement. Most empirical studies capture only one stage of this complex process, and knowledge of how much can be generalized from one stage to another remains unknown. Here we use genetic assignment tests to reconstruct dispersal across five years and 232 patches of a butterfly metapopulation. We link individual dispersal events to weather, landscape structure, size and quality of patches, and individual genotype to identify the factors that influence the three stages of dispersal and post-settlement survival. We found that nearly all tested factors strongly affected departure probabilities, but that the same factors explained very little variation in realized dispersal distances. Surprisingly, we found no effect of dispersal distance on post-settlement survival. Rather, survival was influenced by weather conditions, carry-over effects of natal patch quality, and a strong interaction between genotype and occupancy status of the settled patch, with more mobile genotypes having higher survival as colonists rather than as immigrants. Our work highlights the multicausality of dispersal and that some dispersal costs can only be understood by considering extrinsic and intrinsic factors and their interaction across the entire dispersal process.
Microbiomes associated with avian malaria survival differ between susceptible Hawaiian honeycreepers and sympatric malaria-resistant introduced birds
<p>Of the estimated 55 Hawaiian honeycreepers (subfamily Carduelinae) only 17 species remain, 9 of which the International Union for Conservation of Nature considers endangered. Among the most pressing threats to honeycreeper survival is avian malaria, caused by the introduced blood parasite <em>Plasmodium relictum</em>, which is increasing in distribution in Hawai`i as a result of climate change. Preventing further honeycreeper decline will require innovative conservation strategies that confront malaria from multiple angles. Research on mammals revealed strong connections between gut microbiome composition and malaria susceptibility, illuminating a potential novel approach to malaria control through the manipulation of gut microbiota. </p> <p><span>One honeycreeper species, Hawai`i `amakihi (<em>Chlorodrepanis virens</em>), persists in some areas of high malaria prevalence, indicating they have acquired some level of immunity. To investigate if avian host-specific microbes may be associated with malaria survival, we characterized cloacal microbiomes and malaria infection for 174 `amakihi and 172 malaria-resistant warbling white-eyes (<em>Zosterops japonicus</em>) from Hawai`i Island using 16S rRNA gene metabarcoding and qPCR. Neither microbial alpha nor beta diversity covaried with infection, but 149 microbes showed positive associations with malaria survivors. Among these were <em>Escherichia</em> and <em>Lactobacillus</em> spp., which appear to mitigate malaria severity in mammalian hosts, revealing promising candidates for future probiotic research for augmenting malaria immunity in sensitive endangered species.</span></p>
Data from: Impact of squid predation on juvenile fish survival
<p><span>Predation is a major source of mortality during the early life stages of marine fishes; however, few studies have demonstrated its impact—especially that of squid predation—on survival processes. Here, we examined the feeding habits and predation impacts of swordtip squid on a major prey fish, juveniles of jack mackerel, in the East China Sea. Otoliths of the juveniles extracted from the squid stomach were used to reconstruct the age–length relationship and the growth trajectory of the consumed juveniles, and they were compared to those of juveniles collected with a net using a newly developed statistical framework. The juveniles consumed by squid had significantly shorter body lengths and smaller body sizes during the late larval and early juvenile stages than the netted juveniles, suggesting that smaller juveniles with slower growth rates have a higher probability to be selected. The body mass ratio of the predator squid to prey juveniles (predator-prey mass ratio, PPMR) ranged from 7 to 700, which was remarkably lower than the PPMR reported in various marine ecosystems based on analyses of fishes. Our findings demonstrate that squid predation can significantly impact the early life survival of fish and the trophodynamics in marine ecosystems.</span></p>
Data from: Selection on early survival does not explain germination rate clines in Mimulus cardinalis
<p><strong>Premise</strong> Many traits covary with environmental gradients to form phenotypic clines. While local adaptation to the environment can generate phenotypic clines, other nonadaptive processes may also. If local adaptation causes phenotypic clines, then the direction of genotypic selection on traits should shift from one end of the cline to the other. Traditionally genotypic selection on non-Gaussian traits like germination rate have been hampered because it is challenging to measure their genetic variance.</p> <p><strong>Methods</strong> Here we used quantitative genetics and reciprocal transplants to test whether a previously discovered cline in germination rate showed additional signatures of adaptation in the scarlet monkeyflower (<em>Mimulus cardinalis</em>). We measured genotypic and population level covariation between germination rate and early survival, a component of fitness. We developed a novel discrete log-normal model to estimate genetic variance in germination rate.</p> <p><strong>Results</strong> Contrary to our adaptive hypothesis, we found no evidence that genetic variation in germination rate contributed to variation in early survival. Across populations, southern populations in both gardens germinated earlier and survived more. </p> <p><strong>Conclusions</strong> Southern populations have higher early survival but this is not caused by faster germination. This pattern is consistent with nonadaptive forces driving the phenotypic cline in germination rate, but future work will need to assess whether there is selection at other life stages. This statistical framework should help expand quantitative genetic analyses for other waiting-time traits.</p>
Survival, wet weight and muscle cellular stress responses of Palaemon varians shrimps exposed to combined temperature and salinity variations
<p>Shrimps were exposed to a full factorial experiment combining different temperatures (20, 23 and 26 ºC) and salinities (20, 40). Cellular stress response biomarkers were assessed in the shrimps muscle at several time-points, namely the 7th, 14th, 21st and 28th days of exposure. Wet weight (as proxy for growth) and survival were also assessed during the experiment. These datasets refer to the publication of an article in STOTEN (<a href="https://doi.org/10.1016/j.scitotenv.2022.158732">https://doi.org/10.1016/j.scitotenv.2022.158732</a>).</p> <p>Note: the biomarker dataset contained 3.2% of missing values, which were replaced by group averages for the purpose of the statistical analyses in the article.</p>
Data and R computer code from: Summer elk calf survival in a partially migratory population
<p>These data and computer code (written in R, https://www.r-project.org) were created to statistically evaluate a suite of intrinsic and extrinsic risk factors related to calf elk and their mothers' body condition and age. Specifically, known-fate data were collected from 94 elk calves monitored from 2013-2016 in a partially migratory elk (<em>Cervus</em> <em>canadensis</em>) population in Alberta, Canada. Along with adult female data on pregnancy status, age, and body condition, we created a time-to-event dataset that allowed us to analyze calf mortality risk in a time-to-event approach. We also estimated pooled survivorship and cause-specific mortality, as well as stratifying these metrics by migration tactic (resident vs. eastern migrant). Cox proportional hazards models were used to evaluate calf mortality risk in terms of forage biomass (kg/ha), bear predation risk (from an RSF), and other factors that varied between migration tactics. We tested for differences in a number of maternal reproductive parameters (e.g., pregnancy status) and for calf explanatory variables between migrant and resident elk segments. We also use cumulative incidence functions to estimate cause-specific mortality in this multiple carnivore system. Ultimately, we hope that this work helps wildlife managers anticipate how elk calf survival and partial migration dynamics are affected by grizzly bear predation, and our study builds on a long-term partial migration study at the Ya Ha Tinda Ranch in Alberta, Canada. </p>
Figure 2 in Enhancing survival of Demodex folliculorum (Acari: Demodecidae) under in vitro condition: Effect of temperature and culture media
Figure 2. Microphotograph (40×) of Demodex folliculorum mites in the hair follicle of six individuals with a clinical diagnosis of blepharitis. Note the different life stages of the mites (a = adult; l = larva; n = nymph; o = ovum).
Figure 1 in Enhancing survival of Demodex folliculorum (Acari: Demodecidae) under in vitro condition: Effect of temperature and culture media
Figure 1. Photograph of the eyelids of a patient with cylindrical dandruff attached to the eyelid margin and around the eyelash base.
Data for Survival probabilities of atmospheric particles: comparison based on theory, cluster population simulations, and observations in Beijing
<p>Data for<em> Survival probabilities of atmospheric particles: comparison based on theory, cluster population simulations, and observations in Beijing </em>(https://doi.org/10.5194/acp-2022-484)</p> <p>Contact Santeri Tuovinen (santeri.tuovinen@helsinki.fi) for more details.</p>
BRAIN Journal-Evolving Spiking Neural Networks for Control of Artificial Creatures-Figure 14. Number of artificial creatures that could survive in the external environment
<p>Artificial creatures and the virtual environment are designed and implemented in a C++ platform in which simulations are performed. In the GA algorithm, at First step a population of 100 complex artificial creatures that each of them had 150 neurons were tested and evaluated by GA; each neuron connected to 15 post-synaptic neurons with different axonal conduction delays between every two neurons. In every generation fitness function has been calculated for all population. The initial energy level for each creature is considered as 50. Figure 14 the number of survived chromosome increases with<br> generation progressing.</p>
Supplementary material from the study on survival of African swine fever virus in feed, bedding materials and mechanical vectors, and their potential role in virus transmission
<p><span>Supplementary material from the experimental studies developed to analyse the survival of African swine fever virus in feed, bedding materials and mechanical vectors, and their potential role in virus transmission. </span></p> <p> </p>
Survival-associated cellular response maintained in pancreatic ductal adenocarcinoma (PDAC) switched between soft and stiff 3D microgel culture
<div> <div> <div> <div> <p>Pancreatic ductal adenocarcinoma (PDAC) accounts for about 90% of all pancreatic cancer cases. Five-year survival rates have remained below 12% since the 1970s, in part due to the difficulty in detection before metastasis (migration and invasion into neighboring organs and glands). Mechanical memory is a concept that has emerged over the past decade that may provide a path towards understanding how invading PDAC cells "remember" the mechanical properties of their diseased ("stiff," elastic modulus, E ≈ 10 kPa) microenvironment even whilst invading a healthy ("soft," E ≈ 1 kPa) microenvironment. Here, we investigated the role of mechanical priming by culturing a dilute suspension of PDAC (FG) cells within a 3D, rheologically tunable microgel platform from hydrogels with tunable mechanical properties. We conducted a suite of acute (short-term) priming studies where we cultured PDAC cells in either a soft (E ≈ 1 kPa) or stiff (E ≈ 10 kPa) environment for 6 h, then removed and placed them into a new soft or stiff 3D environment for another 18 h. Following these steps, we conducted RNA-seq analyses to quantify gene expression. Initial priming in 3D culture showed persistent gene expression for the duration of the study, regardless of the subsequent environments (stiff or soft). Stiff 3D culture was associated with the down-regulation of tumor suppressors (LATS1, BCAR3, CDKN2C ), as well as the up-regulation of cancer-associated genes (RAC3). Immunofluorescence staining (BCAR3, RAC3) further supported the persistence of this cellular response, with BCAR3 upregulated in soft culture, and RAC3 upregulated in stiff-primed culture. Stiff-primed genes were stratified against patient data found in The Cancer Genome Atlas (TCGA). Upregulated genes in stiff-primed 3D culture were associated with decreased survival in patient data, suggesting a link between patient survival and mechanical priming.</p> </div> </div> </div> </div>
Fig. 2 in Surviving at the edge of land: finding of the limnetic snail Sibirenauta sibirica (Gastropoda: Physidae) on the coast of the Laptev Sea (Eastern Siberia)
Fig. 2. Shell and anatomy of Sibirenauta sibirica, Tyulahk-Kuel Lake. A – shell, B – body extracted from the shell, C – copulatory apparatus, D, E – female reproductive system. A–D – organs of the same specimen. ag – albumen gland, bc – bursa copulatrix, с – caecum, o – oviduct, v – vagina. Scale bars: 5 mm (A–B), 2 mm (C–E).
Fig. 1 in Surviving at the edge of land: finding of the limnetic snail Sibirenauta sibirica (Gastropoda: Physidae) on the coast of the Laptev Sea (Eastern Siberia)
Fig. 1. Collecting sites of Sibirenauta sibiraca. A – Tyulahk-Kuel Lake, B – small pool on the coast of Tiksi Bay. Photographs by A. Nekhaeva.
Mothers of twins had higher old-age survival than mothers of singletons in Estonian 19th-century birth cohorts
<p><strong><span>Study question:</span></strong><span> Do the mothers of twins and singletons differ regarding post-partum and old-age mortality?</span></p> <p><span> </span><strong><span>Summary answer:</span></strong><span> M</span><span>others of twins had twice as high post-partum mortality as mothers of singletons; survival of twinners was higher than survival of the mothers of singletons after the 67<sup>th </sup>lifespan percentile.</span></p> <p><strong><span>What is known already:</span></strong><span> Twinning is typically associated with higher post-partum maternal mortality. The evidence about whether twinning incurs long-term survival costs of reproduction or is a trait pertinent to long-lived women is scarce and contradictory.</span></p> <p><strong><span>Study design, size, duration:</span></strong><span> The study is based on the data of the Estonian Family Register (operating from 1926-43) and involves 5 565 mothers of twins and 119 613 mothers of singletons born between 1850-99. The subset for comparing maternal lifespans included 1 703 – 1 884 mothers of twins and </span><span>19 747 </span><span>– 36 690 mothers of singletons.</span></p> <p><strong><span>Participants/materials, setting, methods:</span></strong><span> Post-partum maternal mortality was analysed in the whole sample (including mothers of a single child) by logistic regression. Most of the analyses were performed in samples where each mother of twins was matched against mothers of singletons based on parity, urban versus rural origin, whether their lifespan was known, date of birth and age at first birth. Quantile regression was used to analyse age-dependent variations in maternal mortality rates. Lifespans were compared in linear mixed models. All models were adjusted for relevant biodemographic covariates.</span></p> <p><strong><span>Main results and the role of chance:</span></strong><span> The twinning rate in the whole sample was 4.4%. During the year after giving birth, maternal mortality for multiple gestations was 0.75% (17/2 273) and 0.37% (</span><span>449</span><span>/</span><span>122 750)</span><span> for single gestations (OR = 2.05, 95% CI = 1.21 – 3.23). The association between twinning and post-natal maternal mortality remained significant in a model controlling for parity and age of first and last birth. The life spans of the mothers of twins and singletons did not differ in matched samples. Past the 67<sup>th</sup> lifespan percentile, the odds of survival were significantly higher for mothers of twins than mothers of singletons, as indicated by non-overlapping 95% confidence intervals.</span></p> <p><strong><span>Limitations, reasons for caution: </span></strong><span>Relatively low number of individuals (22 802) with known age at death due to discontinuation of the register after 1943.</span></p>
Figure 2 in How omnivory affects the survival and choices of earwig Doru luteipes (Scudder) (Dermaptera: Forficulidae)?
Figure 2. Night feeding time of Doru luteipes with different food sources after 24 and 48 hours starvation. (A) first instar nymphs and 24 hour starvation (p = 0.16); (B) first instar nymphs and 48 h starvation (p = 0.07); (C) second instar nymphs and 24 h starvation (p = 0.02*); (D) second instar nymphs and 48 h starvation (p = 0.60); (E) third instar nymphs and 24 h starvation (p = 0.17); (F) thirdinstar nymphs and 48 h starvation (p = 0.25); (G) fourth-instar nymphs and 24 h starvation (p = 0.84); (H) fourth-instar nymphs and 48 h starvation (p = 0.67); (I) adult and 24 h starvation (p = 0.14), (J) adult and 48 h starvation (p = 0.02*).
Figure 1 in How omnivory affects the survival and choices of earwig Doru luteipes (Scudder) (Dermaptera: Forficulidae)?
Figure 1. Survival curves based on Kaplan-Meier estimates nonparametric method for immature stages of Doru luteipes as a food-sources function.
Figure 4 in Survival of entomopathogenic nematodes in oil emulsions and control effectiveness on adult engorged ticks (Acari: Ixodida)
Figure 4: Effectivity of EPNs at concentration of 100 IJs/tick in vegetable oil emulsions at concentration of 33% on engorged adult ticks. Bars with unequal letters are statistically different (Tukey, P <0.05).
ScienceDex guides
Understand access before you commit
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.