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91 results for “African savannas”
Data from: Interplay of physical and social drivers of movement in male African savanna elephants
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Data from: Ants, fire and bark traits affect how African savanna trees recover following damage
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Data from: Snapshot Serengeti, high-frequency annotated camera trap images of 40 mammalian species in an African savanna
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Data from: Climate and the landscape of fear in an African savanna
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Data from: Large mammal declines and the incipient loss of mammal-bird mutualisms in an African savanna ecosystem
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The role of deterministic succession during forest succession within a South African savanna
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Large herbivores transform plant-pollinator networks in an African savanna
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Livestock as vectors of organic matter and nutrient loading in aquatic ecosystems in African savannas
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Data from: Elevational transplantation suggests different responses of African submontane and savanna plants to climate warming
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Data from: A thorny issue: woody plant defence and growth in an East African savanna
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Data from: Insect outbreaks alter nutrient dynamics in a southern African savanna: patchy defoliation of Colophospermum mopane savanna by Imbrasia belina larvae
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Data from: Dietary niche separation of rodents and shrews in an African savanna
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Data from: Plant DNA-barcode library and community phylogeny for a semi-arid East African savanna
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High-intensity fires may have limited medium-term effectiveness for reversing woody plant encroachment in an African savanna
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Data from: Leaf traits of African woody savanna species across climate and soil fertility gradients: evidence for conservative vs. acquisitive resource use strategies
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Data from: Woody cover in wet and dry African savannas after six decades of experimental fires
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Genetic connectivity and population structure of African savanna elephants (Loxodonta africana) in Tanzania
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Data from: Fire frequency drives habitat selection by a diverse herbivore guild impacting top–down control of plant communities in an African savanna
In areas with diverse herbivore communities such as African savannas, the frequency of disturbance by fire may alter the top–down role of different herbivore species on plant community dynamics. In a seven year experiment in the Kruger National Park, South Africa, we examined the habitat use of nine common herbivore species across annually burned, triennially burned and unburned areas. We also used two types of exclosures (plus open access controls) to examine the impacts of different herbivores on plant community dynamics across fire disturbance regimes. Full exclosures excluded all herbivores > 0.5 kg (e.g. elephant, zebra, impala) while partial exclosures allowed access only to animals with shoulder heights ≤ 0.85 m (e.g. impala, steenbok). Annual burns attracted a diverse suite of herbivores, and exclusion of larger herbivores (e.g. elephant, zebra, wildebeest) increased plant abundance. When smaller species, mainly impala, were also excluded there were declines in plant diversity, likely mediated by a decline in open space available for colonization of uncommon plant species. Unburned areas attracted the least diverse suite of herbivores, dominated by impala. Here, herbivore exclusion, especially of impala, led to strong declines in plant richness and diversity. With no fire disturbance, herbivore exclusion led to competitive exclusion via increases in plant dominance and light limitation. In contrast, on triennial burns, herbivore exclusion had no effect on plant richness or diversity, potentially due to relatively little open space for colonization across exclosure treatments but also little competitive exclusion due to the intermediate fire disturbance. Further, the diverse suite of grazers and browsers on triennial burns may have had a compensating effect of on the diversity of grasses and forbs. Ultimately, our work shows that differential disturbance regimes can result in differential consumer pressure across a landscape and result in heterogeneous patterns in top–down control of community dynamics.
Data from: Woody plant biomass and carbon exchange depend on elephant-fire interactions across a productivity gradient in African savanna
Elephants and fire are individually well-known disturbance agents within savanna ecosystems, but their interactive role in governing tree-cover dynamics and savanna–forest biome boundaries remains unresolved. Of central importance are the mechanisms by which elephants vs. fire affect tree biomass and cover, and how – over long time periods – both factors interact with rainfall and soils to govern tree biomass and carbon dynamics. Here, we evaluated the response of woody vegetation to 56 years of fire manipulation in South Africa's Kruger National Park, with three fire regimes (annual, triennial and unburned) replicated across a productivity gradient and subject to two periods of contrasting elephant abundances (generated by the cessation of culling in 1994). Higher fire frequencies had a negative effect on woody biomass in the low-elephant period, but this effect was weak to negligible in the high-elephant period as the difference among fire treatments diminished. Moreover, elephants removed increasing amounts of woody biomass as productivity increased across study sites, but fire did not. We infer that elephant-induced tree mortality could overcome increases in woody-plant productivity, while fire-induced mortality alone could not. Elephants caused woody-plant carbon to shift from a sink to a source; this effect was independent of fire treatment, with highest rates of net carbon removal in the wettest and most productive site. Synthesis. Our results reveal a context-dependent interaction between fire and elephants as disturbance agents in savanna: the influence of fire on woody plants was sensitive to the abundance of elephants and diminished with increased plant productivity. In contrast, elephants were capable of shifting landscapes from relatively dense woodland to open savanna, even in unburned sites, and exerted strong impacts irrespective of site conditions and plant productivity.
Semi-arid African savanna habitat suitability for two Vachellia species
<p><span>The habitat suitability of <em>Vachellia</em> <em>stuhlmannii</em> and <em>Vachellia</em> <em>tortilis</em> was assessed using Maximum Entropy model. Location data was collected and nineteen bioclimatic variables data for 1950 to 2000 downloaded from the WorldClim database. Soils were analyzed to investigate their influence on habitat suitability of the two species. MaxEnt effectively predicted current habitat suitability with an average test Area Under Curve value of 0.936 for <em>V. stuhlmannii</em> and 0.689 for <em>V. tortilis</em>. Key influential variables were BIO-1 (Annual mean temperature) with 71.7% highest gain for <em>V. stuhlmannii</em> and BIO-17 (Precipitation of driest quarter) with 65.3% highest gain for <em>V. tortilis</em>. However, BIO-14 (Precipitation of driest month) exhibited limited influence in predicting habitat suitability for both species.<em> V. stuhlmannii</em> occupies twenty-nine hectares and <em>V. tortilis</em> covers 102 hectares. Both species predominantly occur on Prismacutanic/pedocutanic B-horizons. <em>V. tortilis</em> also thrive on Glenrosa and Mispah soils, which are crucial for diverse plant and animal life. These findings have practical implications for conservation efforts aimed at protecting both species. Identifying suitable habitats and preserving soil types is crucial as soil affects microclimate conditions and influences moisture retention. Overall, this study provides insights for the conservation of <em>V. stuhlmannii </em>and<em> V. tortilis</em> in the semi-arid African savanna.</span></p>
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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)
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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.