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11,983 results for “africa”
Supporting data for von Fromm et al. (2023) Controls on timescales of soil organic carbon persistence across sub-Saharan Africa
<p>This file contains the supporting data for<em> von Fromm et al. (2024) Controls on timescales of soil organic carbon persistence across sub-Saharan Africa, Global Change Biology</em>, <a href="https://doi.org/10.1111/gcb.17089">https://doi.org/10.1111/gcb.17089</a></p> <p>We used wet soil chemistry data from <em>Vågen et al., 2021</em> (<a href="https://doi.org/10.34725/DVN/66BFOB">https://doi.org/10.34725/DVN/66BFOB</a>). In addition, we added newly measured radiocarbon data, extracted global climate data, gross primary productivity and quantified soil mineralogy based on X-ray powder diffraction data. Turnover time for carbon (mean C age) was calculated from Δ14C (‰) values by using an one-pool model. For more details about the sampling, calculations, and units see the associated publication. To reproduce all analysis, including calculating the mean C age, please visit the author's github page: <a href="https://github.com/SophievF/AfSIS_14C">https://github.com/SophievF/AfSIS_14C</a>. </p> <p>The dataset is also part of the International Soil Radiocarbon Database (<a href="https://soilradiocarbon.org/">https://soilradiocarbon.org/</a>).</p>
A checklist of the spiders (Arachnida, Araneae) of the Kirstenbosch National Botanical Garden, South Africa
<p>An annotated species list of spiders presently known from the Kirstenbosch National Botanical Garden is provided. The checklist was compiled from data collected from the South African National Survey of Arachnida (SANSA) database. A total of 170 spe-cies from 46 families and 128 genera are presently protected in the garden. The two most species-rich families are the Salticidae (20 spp.) and Thomisidae (20 spp.), followed by the Theridiidae (13 spp.) and Araneidae (12 spp.), while 18 families are represented by sin-gletons. The global distribution, endemicity, and conservation status for each species are provided and species of special concern are identified, as well as possible new species. Most of the species (82%) have a wide distribution range and are of Least Concern, 8.3% are Data Deficient and 17 species are of special concern. Only one species is endemic to Kirstenbosch, and 37 are Western Cape endemics.</p>
First record of the crab spider Thomisus ghesquierei Lessert, 1943 from South Africa (Araneae: Thomisidae)
<p>The crab spider <i>Thomisus ghesquierei</i> Lessert, 1943 was described from the Democratic Republic of the Congo from a female specimen. In South Africa, it was previously wrongly identified as <i>Thomisus citrinellus</i> and is now recognised for the first time in South Africa. The differences between <i>T. citrinellus</i> and <i>T. ghesquierei</i> are discussed and photographs of live specimens are provided. The general morphology of <i>T. ghesquierei</i> is discussed with notes on their behaviour, distribution in South Africa, and conservation status.</p>
Final report on the diversity of the Mountain Zebra National Park, South Africa (Arachnida: Araneae)
<p>Two checklists have previously been published from the Mountain Zebra National Park. In 1988, only 32 species were recognised and in 2006, 43 species. In this final report, we list 150 species from 38 families, increasing the number of species recog-nised with 107 species. For the first time, we provide information on the endemicity and conservation status of the 150 species. The family Gnaphosidae was the most diverse with 17 species sampled, followed by the Salticidae with 15 species, and Thomisidae with 14. Ten of the families are known only from a single species. This is an inventory project of the South African National Survey of Arachnida (SANSA).</p>
Julius Caesar. Denarius, Africa 47-46
made with Agisoft photoscan Crawford458-1 Julius Caesar. Denarius, Africa 47-46, AR 3.83 g. Diademed head of Venus r. Rev. CAESAR Aeneas advancing l., carrying palladium in r. hand and Anchises on l. shoulder. B. Julia 10. C 12. Sydenham 1013. Sear Imperators 55. Crawford 458/1. http://davy.potdevin.free.fr/Site/crawford5-2.html Source: Objaverse 1.0 / Sketchfab
South Africa House Bison - Polycam
[About South Africa House](https://en.wikipedia.org/wiki/High_Commission_of_South_Africa,_London) [Loaction](https://www.google.com/maps/@51.5080597,-0.1270543,3a,21.8y,47.01h,91.58t/data=!3m6!1e1!3m4!1sg7l3b8Q_RyfdUkSvyis3Lw!2e0!7i16384!8i8192) Created with Polycam. Source: Objaverse 1.0 / Sketchfab
Africa 3D map
At EROS Data Center is a large globe that NASA commissioned to familiarize the astronauts with Earth's geography. This was in part so the astronauts could figure out where they were while in orbit. I snapped about 63 photos with my LG G4 in manual mode to create this raised relief map. Enjoy! Source: Objaverse 1.0 / Sketchfab
El Jem Africa Mosaic
Second/third century CE mosaic from the House of Africa (currently in the El Jem Archaeological Museum) Source: Objaverse 1.0 / Sketchfab
Research Funding in the Middle East and North Africa: Analyses of Acknowledgments in Scientific Publications (unified funders)
<p>This dataset is the result of the unification of funder names acknowledged in scientific publications indexed in the Web of Science with at least one author affiliated to an institution located in the Middle East and North Africa.</p> <p>This list contains 1,039 unified names of funders from the 22 MENA countries as of 16 March 2023 along with their type and country.</p>
Data from: Distribution, population dynamics and potential impacts of the invasive snail, Tarebia granifera in aquatic ecosystems of north-eastern South Africa
<p>Aquatic ecosystems globally have been invaded by molluscs. <em>Tarebia granifera</em> is a highly successful invader, often becoming the dominant aquatic invertebrate species in an invaded ecosystem. Resultingly, it has been suggested that <em>T. granifera</em> may have severe negative impacts on these invaded ecosystems. Limited information is available regarding the population structures and densities of <em>T. granifera</em>, particularly in invaded countries such as South Africa, and information on this could assist in developing management and control strategies for this invasive species. The aim of the present study was to assess the current distribution, densities, and population structures of <em>T. granifera</em> in invaded habitats on the Limpopo and Phongolo River systems, South Africa. This was accomplished by collecting aquatic benthic molluscs from sites across these systems. Water quality parameters were measured at each site and water samples collected for chemical nutrient analyses. The density of snails was determined for each site and the population size and structure as well as birth rate was calculated for <em>T. granifera. </em><em>Tarebia granifera</em> was found to be the dominant molluscan species in habitats where it was present and all size classes from new-born to mature adults were found throughout at some of the highest densities globally. Worryingly, native molluscan species, were often absent or in much lower densities than reported in literature at sites where <em>T. granifera</em> was present, suggesting a negative effect on the native molluscan density and diversity. Contrary to most previous studies, there were no significant correlations between <em>T. granifera </em>and the selected water quality parameters. Higher densities and new-born recruitment of <em>T. granifera </em>were observed in the spring than autumn, likely in response to shifts in environmental conditions. This study provides crucial insights into the population structure and dynamics of <em>T. granifera</em> in invaded habitats, particularly for relatively newly invaded regions such as southern Africa.</p>
Invasion risk of the currently cultivated alien flora in Southern Africa is predicted to decline under climate change
<p>Alien species can have massive impacts on native biodiversity, ecosystem functioning, and human livelihoods. Assessing which species from currently cultivated alien floras may escape into the wild and naturalize is essential for efficient and proactive ecosystem management and biodiversity conservation. Climate change has already promoted the naturalization of many alien plants in temperate regions, but whether it is similar in (sub)tropical areas is insufficiently known. In this study, we used species distribution models for 1,527 cultivated alien plants to evaluate current and future invasion risks across different biomes and 10 countries in southern Africa. Our results confirm that the area of suitable climate is a strong predictor of naturalization success among the cultivated alien flora. In contrast to previous findings from temperate regions, however, climatic suitability is generally predicted to decrease for potential aliens across our (sub)tropical study region. While increasingly hotter and drier conditions are likely to drive declines in suitability for potential aliens across most biomes of southern Africa, in some the number of potential invaders is predicted to increase under moderate climate change scenarios (e.g., in dry broadleaf forests and flooded grasslands). We found that climatic suitability is expected to decline less for aliens originating from continents with the tropical biome or from the Southern Hemisphere. In addition, we found that the climatically suitable area will decline less for aliens that have already naturalized in the region. While the number of potential invaders may decrease across southern Africa under future climate change, our results suggest that already naturalized aliens will continue to threaten native species and ecosystems.</p>
Appendix 1 to "The Status of Biological Invasions and their Management in South Africa in 2022"—Species level pathway data
<p>SANBI and CIB 2023. Appendix 1 to "The Status of Biological Invasions and their Management in South Africa in 2022"—Species level pathway data. South African National Biodiversity Institute, Kirstenbosch and DSI-NRF Centre of Excellence for Invasion Biology, Stellenbosch. http://dx.doi.org/10.5281/zenodo.8217192</p> <p>For more details see: http://iasreport.sanbi.org.za</p> <p>For the report itself see: http://dx.doi.org/10.5281/zenodo.8217182</p>
Appendix 7 to "The Status of Biological Invasions and their Management in South Africa in 2022"—The Species List for the Prince Edward Islands
<p>SANBI and CIB 2023. Appendix 7 to "The Status of Biological Invasions and their Management in South Africa in 2022"—The Species List for the Prince Edward Islands. South African National Biodiversity Institute, Kirstenbosch and DSI-NRF Centre of Excellence for Invasion Biology, Stellenbosch. http://dx.doi.org/10.5281/zenodo.8217229</p> <p> </p> <p>For more details see: http://iasreport.sanbi.org.za<br> For the report itself see: http://dx.doi.org/10.5281/zenodo.8217182</p>
Achoanus hulleyi, n.sp. I. Head of male in profile; 2. Head of female in profile: 3. Wing. in A New Genus And Species Of Syrphidae (Diptera) From South Africa
Achoanus hulleyi, n.sp. I. Head of male in profile; 2. Head of female in profile: 3. Wing.
. in A revision of Stemodiopsis Engl. (Linderniaceae) in South Africa
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Evidence for a role of Anopheles stephensi in the spread of drug- and diagnosis-resistant malaria in Africa
<p>Anopheles stephensi, an Asian malaria vector, continues to expand across Africa. The vector is now firmly established in urban settings in the Horn of Africa. Its presence in areas where malaria resurged suggested a possible role in causing malaria outbreaks. Here, using a prospective case–control design, we investigated the role of An. stephensi in transmission following a malaria outbreak in Dire Dawa, Ethiopia in April–July 2022. Screening contacts of patients with malaria and febrile controls revealed spatial clustering of Plasmodium falciparum infections around patients with malaria in strong association with the presence of An. stephensi in the household vicinity. Plasmodium sporozoites were detected in these mosquitoes. This outbreak involved clonal propagation of parasites with molecular signatures of artemisinin and diagnostic resistance. To our knowledge, this study provides the strongest evidence so far for a role of An. stephensi in driving an urban malaria outbreak in Africa, highlighting the major public health threat posed by this fast-spreading mosquito.</p>
Caffeine citrate status, availability and practice across Nigeria, Ethiopia, Kenya, South Africa and five States in India
<p>Apnea of prematurity (AOP) is a common complication among preterm infants (<37 weeks gestation), globally. However, access to caffeine citrate (CC) that is a proven safe and effective treatment in high income countries is largely unavailable in low-and-middle income countries, where most preterm infants are born. Therefore, the overall aim of this study was to describe the demand, policies, and supply factors affecting the availability and clinical use of CC in LMICs.</p> <p>A mixed methods approach was used to collect data from diverse settings in LMICs including Ethiopia, Kenya, Nigeria, South Africa, and India. Qualitative semi-structured interviews and focus group discussions were conducted with different health care providers, policymakers, and stakeholders from industry. Additional data was collected using standard questionnaires. A thematic framework approach was used to analyze the qualitative data and descriptive statistics were used to summarize the quantitative data. The findings indicate that there is variation in in-country policies on the use of CC in the prevention and treatment of AOP and its availability across the LMICs. As a result, the knowledge and experience of using CC also varied with clinicians on Ethiopia having no experience of using it while those in India have greater knowledge and experience of using it. The in turn influenced the demand and our findings show that only 29% of eligible preterm infants are receiving CC in these countries.</p> <p>There is an urgent need to address the multilevel barriers to accessing CC for management of AOP in Africa. These include cost, lack of national policies and therefore lack of demand stemming from its clinical equivalency with aminophylline. Practical ways to reduce the cost of CC in LMICs could potentially increase its availability and use.</p>
Fig. 1. Tick species and the total monthly tick numbers collected during the 5 in Seasonal variations in ixodid tick populations on a commercial game farm in the Limpopo Province, South Africa
Fig. 1. Tick species and the total monthly tick numbers collected during the 5-year study period.
FIG. 1 in New bryophytes for Tunisia (North Africa). Part 2: other families
FIG. 1. — Location of the study sites in northern Tunisia.
Forest disturbance detection by using remote sensing and artificial intelligence in Africa
<p>The dataset arises from the "Forest Disturbance Detection Using Remote Sensing and Artificial Intelligence in Africa" (EO4Forest) project, a collaboration funded by the European Space Agency and conducted by Wrocław University of Environmental and Life Sciences (Poland) and Lagos State University (Nigeria). Designed for forest monitoring in the Ogun and Lagos States, the dataset includes detailed land cover classification maps for the years 2015, 2019, 2022, and 2023, all at a 20-meter spatial resolution to ensure accurate representation of land cover. A legend file accompanies the maps, clarifying six defined land cover classes: water, urbanized areas, soil, cropland, grasslands, and forest.</p> <p>The dataset includes over 112,000 training and 11,900 validation samples, which are essential for the accurate development and evaluation of the Random Forest classification models used. Special emphasis was placed on the forest class, ensuring a diverse representation of forest types, including tropical humid forests, mangroves, and dry woodlands.</p> <p>In addition to land cover maps, the dataset also contains forest gain and loss maps, with a particular focus on recent updates for selected subareas in 2022 and 2023, available in the NTR_ForestUpdate folder.</p> <p>Based on optical satellite imagery from Sentinel-2 and Landsat-8, the dataset leverages spectral indices and the Random Forest algorithm to classify land cover types. It provides valuable insights for environmental research related to deforestation, reforestation, and afforestation. Forest change maps are included to highlight areas of forest loss and gain, capturing the dynamic shifts in Nigeria's forest cover and offering detailed geographic context.</p> <p>The methodology, including data acquisition, preprocessing, feature extraction (spectral index calculation), classification, and accuracy assessment, is fully documented in Python scripts available in the associated GitHub repository. This ensures transparency and reproducibility, offering users both the processed outputs and the tools necessary for custom analyses and advanced forest monitoring.</p>
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.