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4 results for “African savannah elephant”
Dyadic distances in African savannah elephants as they transition from Semi-captivity to the wild in Okavango Delta, Botswana, 2021 to 2023
Data package contains a dataset of distances(m) of 15 dyads generated from GPS collar data of 6 female savannah elephants as they were being released from semi-captivity to the wild in Okavango Delta, Botswana from November 1st, 2021-November 29th,2023. The dataset is provided as part the manuscript `Dyadic distance in African savannah elephants (Loxotonda africana) increases during release from semi-captivity to the wild`.
Data from: Synergistic effects of fire and elephants on arboreal animals in an African savannah
1. Disturbance is a crucial determinant of animal abundance, distribution and community structure in many ecosystems, but the ways in which multiple disturbance types interact remain poorly understood. The effects of multiple-disturbance interactions can be additive, subadditive or super-additive (synergistic). Synergistic effects in particular can accelerate ecological change; thus, characterizing such synergies, the conditions under which they arise, and how long they persist has been identified as a major goal of ecology. 2. We factorially manipulated two principal sources of disturbance in African savannas, fire and elephants, and measured their independent and interactive effects on the numerically dominant vertebrate (the arboreal gekkonid lizard Lygodactylus keniensis) and invertebrate (a guild of symbiotic Acacia ants) animal species in a semi-arid Kenyan savanna. 3. Elephant exclusion alone (minus fire) had negligible effects on gecko density. Fire alone (minus elephants) had negligible effects on gecko density after 4 months, but increased gecko density twofold after 16 months, likely because the decay of fire-damaged woody biomass created refuges and nest sites for geckos. In the presence of elephants, fire increased gecko density nearly threefold within 4 months of the experimental burn; this occurred because fire increased the incidence of elephant damage to trees, which in turn improved microhabitat quality for geckos. However, this synergistic positive effect of fire and elephants attenuated over the ensuing year, such that only the main effect of fire was evident after 16 months. 4. Fire also altered the structure of symbiotic plant-ant assemblages occupying the dominant tree species (Acacia drepanolobium); this influenced gecko habitat selection but did not explain the synergistic effect of fire and elephants. However, fire-driven shifts in plant-ant occupancy may have indirectly mediated this effect by increasing trees' susceptibility to elephant damage. 5. Our findings confirm the importance of fire × elephant interactions in structuring arboreal wildlife populations. Where habitat modification by megaherbivores facilitates co-occurring species, fire may amplify these effects in the short term by increasing the frequency or intensity of herbivory, leading to synergy. In the longer term, tree mortality due to both top kill by fire and toppling by large herbivores may reduce overall microhabitat availability, eliminating the synergy.
Data from: Release from captivity allows African savannah elephant movement patterns to converge with those of wild and rehabilitated conspecifics
Open the record for dataset details and reuse information.
Data from: Synergistic effects of fire and elephants on arboreal animals in an African savannah
Open the record for dataset details and reuse information.
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