Publications
Tourism infrastructure and physiological stress in free-ranging impalas (Aepyceros melampus) of Serengeti National Park
Large-scale tourism infrastructure in Serengeti National Park elevates physiological stress in free-ranging impalas (Aepyceros melampus), even when tourists are absent. Researchers measured faecal glucocorticoid metabolites (FGMs) as a stress indicator, revealing significantly higher FGM levels in impalas near lodges compared to those near permanent tented camps or seasonal campsites. This suggests that the mere presence of substantial tourist facilities can induce stress in wildlife, posing potential risks to biodiversity. The study highlights the need for future research to identify specific infrastructure features driving this stress response, aiming to inform more sustainable tourism and conservation strategies.
Habitat selection by an extraordinary savannah raptor: environmental factors driving abundance of the Secretarybird Sagittarius serpentarius in the Serengeti National Park (Tanzania)
A groundbreaking study reveals that Secretarybirds (Sagittarius serpentarius) thrive in the Serengeti National Park's transition zones, where extensive grasslands meet open woodlands or treed shrublands. Researchers estimated a population of 1,513 individuals with densities peaking at 2.3 birds per 10 km². Secretarybirds favor flat terrains with seasonal rivers and annual precipitation below 900 mm, avoiding areas with low vegetation cover or excessive prescribed burning (>60%). Pairs prefer closed treed shrublands, while single birds are more common in heterogeneous habitats. This research provides critical insights for long-term conservation efforts in Tanzania's Serengeti ecosystem.
Interplay of competition and facilitation in grazing succession by migrant Serengeti herbivores
A groundbreaking study reveals that the migration of herbivores in Serengeti National Park is governed by a dynamic interplay of competition and facilitation, characterized as a 'push-pull' mechanism. Large-bodied zebras are nudged ahead of wildebeest due to competitive grazing, while their consumption of grass facilitates the arrival of smaller gazelles. This balance was observed through an 8-year study involving camera-trap surveys, GPS-collared herbivores, and fecal DNA metabarcoding, providing unprecedented insights into the mechanisms regulating large-scale ungulate migrations. Natural experiments, such as wildfires and rainfall, further demonstrated how these forces can disrupt or strengthen grazing succession patterns.
Proximate causes and perceptions of livestock keepers toward the risks of illegal grazing in Serengeti National Park
Livestock keepers in Serengeti National Park (SNP) primarily graze illegally due to insufficient pasturage and water in surrounding districts, compounded by high cattle competition. While most fear arrest within the park, large herders mitigate risks from wild animals using defensive techniques. The study highlights the need for authorities to adapt grazing practices based on rangeland conditions, stocking rates, and readiness to reduce illegal grazing. Conducted via semi-structured questionnaires, this research sheds light on the proximate causes and perceptions of risks among livestock keepers in SNP.
Rocky outcrops form islands of high and unique tree biodiversity within an ocean of grass in Serengeti National Park
Rocky outcrops, or kopjes, in Serengeti National Park act as biodiversity hotspots for trees, significantly increasing tree abundance and species richness compared to the surrounding grass-dominated savannah. These unique ecosystems host distinct tree communities, particularly at sites with lower precipitation, where differences between kopje and matrix plots are most pronounced. Dominant tree species on kopjes exhibit functional traits such as evergreen foliage, higher specific leaf area, lower leaf nitrogen content, and reduced spine density, suggesting adaptations to locally moist conditions and lower fire frequencies. This study highlights the critical role of kopjes in shaping tree biodiversity, with potential implications for ecosystem functioning and higher trophic levels.
Spatial and temporal niche overlap of aardwolves and aardvarks in Serengeti National Park, Tanzania
Aardwolves and aardvarks, two ecologically similar nocturnal insectivores, exhibit high spatial and temporal niche overlap in Serengeti National Park, Tanzania. Research using multispecies occupancy models with 105 remote camera detections (2016–2018) revealed a positive interaction between their occupancy probabilities, suggesting commensalism where aardwolves benefit from increased food accessibility due to aardvark presence. While slope, grassland proportion, and termite mound density did not influence occupancy, aardwolf occupancy increased with distance from permanent water sources, possibly to avoid predation risk. Both species showed high diel activity overlap during wet and dry seasons, remaining largely nocturnal. These findings enhance understanding of their ecological roles as termite consumers and potential ecosystem engineers.
Charcoal Whirlwinds and Post-Fire Observations in Serengeti National Park Savannahs
Researchers documented rare 'charcoal whirlwinds'—dust devils that lofted large quantities of charcoal into the atmosphere following wildfires in Serengeti National Park, Tanzania. These phenomena, observed in two distinct savannah regions (Western Corridor and Lamai), exhibited unique characteristics such as color, funnel shape, and height, depending on local land cover types and fuel canopies. The study leveraged field observations, meteorological data, and satellite imagery to analyze the spatiotemporal patterns of these whirlwinds, though direct measurements of particulate matter were not conducted. Findings suggest that charcoal-laden whirlwinds play a significant but understudied role in redistributing organic material across landscapes, with potential implications for regional-to-global atmospheric particle fluxes and depositional environments like lakes and wetlands.
Non‐local effects of human activity on the spatial distribution of migratory wildlife in Serengeti National Park, Tanzania
Hard boundaries between protected areas and human-dominated landscapes significantly reduce the presence of migratory wildebeest and zebra in Serengeti National Park, Tanzania. Unlike soft boundaries marked by gradual transitions, sudden transitions from park to agro-pastoral land use sharply decrease wildlife occurrence, suggesting that hard boundaries shrink the effective size of conservation areas. Researchers used camera traps along transects perpendicular to the park boundary, analyzing over 2 million images with a deep neural network and Bayesian modeling to assess wildebeest and zebra presence relative to distance from the boundary, grass greening/drying rates (dNDVI), and protein concentration. The study highlights the non-local effects of human activity on wildlife distribution, emphasizing the importance of boundary design in conservation strategies.
Challenges Facing Domestic Tourism Promotion-A case of Serengeti National Park-Tanzania
Serengeti National Park, despite its potential as a premier tourist destination, faces significant challenges that hinder the growth of domestic tourism. Key obstacles include the absence of tailored marketing packages for domestic tourists, lack of a cohesive policy or strategy for domestic tourism development, neglect from both the business sector and government, subpar service quality, and high costs at the park. These factors collectively limit economic empowerment, community development, and poverty alleviation efforts. The study, conducted through questionnaires and observations with diverse respondents, employed descriptive and inferential analysis to highlight these issues. Recommendations emphasize the need for intensive involvement from the Ministry of Natural Resources and Tourism (MNRT) in crafting combined promotion strategies to address these challenges effectively.
Contribution of Selected Herbivores’ Dung on the Soil Organic Carbon and Nitrogen in Serengeti National Park, Tanzania
Herbivore dung significantly contributes to soil organic carbon (OC) and nitrogen (N) in the Serengeti National Park, with ruminant species like buffalo, zebra, and wildebeest showing a 1% higher N increase compared to non-ruminants such as elephants. This study analyzed dung decomposition and nutrient dynamics across three distinct soil textures—clay, sandy loam, and sand clay loam—in Serena, Barafu, and Seronera sites. Over 18 weeks, dung pats were monitored for weight change, OC, N, pH, and particle size distribution, revealing that while soil texture influenced OC addition, neither texture nor treatment significantly affected N increase. The C/N ratios (11 in controls vs. 15 in treatments) indicated a potential for dung to enhance soil fertility, with fluctuations attributed to weather changes. This finding underscores the ecological role of herbivore dung in maintaining nutrient cycles in grazed ecosystems.
Determinants of International Tourists’ Destination Loyalty: Empirical Evidence from Serengeti National Park in Tanzania
A study on Serengeti National Park (SENAPA) reveals that service quality, destination image, perceived value, and satisfaction are key drivers of international tourists' loyalty. Conducted with 1,148 respondents from March to December 2018, the research used Structural Equation Modelling (SEM) to analyze data collected via structured surveys. Findings indicate that high-quality services, positive destination perceptions, and value realization significantly enhance tourist loyalty. Satisfaction was found to partially mediate the relationship between these factors and loyalty. The study recommends that SENAPA management prioritize maintaining service quality and reviewing costs like park entry fees to remain competitive with other African parks.
Moisture and temperature influences on nonlinear vegetation trends in Serengeti National Park
A greening-to-browning shift in Serengeti National Park's vegetation during the long rains (March) and a contrasting browning-to-greening trend during the short rains (November, December) are driven by nonlinear interactions between moisture availability and temperature. This finding emerges from a 34-year analysis (1982–2016) of leaf area index (LAI), using advanced statistical techniques like Ensemble Empirical Mode Decomposition and Principal Component Analysis with regression. The study reveals that while long-term greening trends are often observed globally, the Serengeti exhibits complex, sub-seasonal variations influenced by declining antecedent precipitation and rising temperatures, particularly after the early 2000s. These insights highlight the nuanced climate-vegetation dynamics shaping this critical East African ecosystem.
Upstream land-use negatively affects river flow dynamics in the Serengeti National Park
Upstream land-use changes, including increased commercial-scale irrigation and livestock grazing, have significantly disrupted river flow dynamics in the Serengeti National Park (SNP), threatening its water supply and ecosystem. Research shows that while the baseflow recession period for the Mbalageti River—an internal system within SNP—has remained stable at 70 days, the Mara River's recession period has plummeted from 100 days in the 1970s to just 16 days today due to water extraction for irrigation upstream. Proposed dams could further exacerbate this issue, leading to zero river flow within SNP. Additionally, severe erosion from livestock grazing has caused sediment buildup, risking the drying out of critical dry-season water holes essential for wildlife. The study highlights the urgent need for ecohydrology-based solutions to mitigate catchment degradation and ensure sustainable water provision in this UNESCO World Heritage Site.
Where and when does the danger lie? Assessing how location, season and time of day affect the sequential stages of predation by lions in western Serengeti National Park
Lions in the Serengeti National Park's western corridor exhibit significant temporal and spatial variation in predation stages, with encounters more likely during diurnal or crepuscular periods than at night. This nocturnal reduction may be linked to full-moon phases, potentially explaining lions' poor hunting success under these conditions. While seasonal prey abundance varied, predation stage probabilities remained consistent across seasons. Spatially, lions preferred open, prey-rich areas near water and range centers for encounters and kills, suggesting opportunistic hunting, but attacks occurred closer to range peripheries with greater hunting cover, indicating ambush tactics. The study highlights the importance of analyzing different stages of predation to understand predator-prey dynamics fully.
Zooarchaeology and Taphonomic Aspects of Later Stone Age Faunal Assemblage from Loiyangalani Site in Serengeti National Park, Tanzania
A detailed zooarchaeological analysis of the Later Stone Age (LSA) faunal assemblage from Loiyangalani Site in Serengeti National Park, Tanzania, reveals that LSA humans primarily exploited high-quality nutritional resources, including large-sized animals and aquatic species. The study highlights minimal fluvial disturbance and marginal carnivore involvement, with the assemblage showing significant anthropogenic inputs such as stone tool butchery marks (cut and percussion marks) and few carnivore tooth marks. This suggests a strategic focus on meat and fat acquisition by LSA humans, while taphonomic agents played a limited role in the formation of the assemblage.
An investigation of power law distribution in wildebeest (Connochaetes taurinus) herds in Serengeti National Park, Tanzania
Wildebeest herds in the Serengeti National Park exhibit aggregation patterns that follow a truncated power law distribution, suggesting predictable statistical behavior driven by social interactions among individuals. This discovery challenges traditional assumptions about herd dynamics and provides new insights into the mathematical modeling of animal group movements. Researchers analyzed aerial survey images from 2015 to quantify empirical distributions and then used a Lagrangian model to simulate individual movement and herd aggregation, matching parameter values to observed data. The findings imply that social behavior plays a significant role in shaping large-scale migration patterns, offering a novel framework for understanding collective animal dynamics.
Cross‐species transmission and evolutionary dynamics of canine distemper virus during a spillover in African lions of Serengeti National Park
A single cross-species spillover event from canids to noncanid hosts likely ignited a large-scale canine distemper virus (CDV) outbreak in African lions (Panthera leo) in the Serengeti National Park between 1993 and 1994, causing clinical disease and population decline. Using Bayesian phylodynamic analysis of 21 near-complete viral genomes from four species, researchers found that spotted hyenas (Crocuta crocuta) may have acted as the proximate source of CDV exposure in lions. The study identified 13 nucleotide substitutions segregating CDV strains between canids and noncanids, suggesting virus evolution played a role in emergence in novel hosts. These findings highlight how host barriers to clinical infection can influence spillover outcomes and provide insights into pathogen dynamics during emergence events.
Effects of life history stage and climatic conditions on fecal egg counts in plains zebras (Equus quagga) in the Serengeti National Park
A study on plains zebras (Equus quagga) in the Serengeti National Park reveals that parasite burdens are influenced by life history stages, environmental conditions, and co-infection. Key findings include higher Strongylidae egg counts and increased likelihood of Anoplocephalidae infections in bachelors compared to band stallions, while Ascarididae egg counts were higher in band stallions. Subadults showed higher Strongylidae egg counts than foals, and Ascarididae infections were more likely under wet conditions. Co-infections with multiple parasite groups did not significantly affect Strongylidae egg counts but increased Ascarididae counts in adult females. The research used fecal egg counts to assess gastrointestinal parasite infection, analyzing data from two nematode families (Strongylidae and Ascarididae) and the presence of cestode (Anoplocephalidae) eggs.
Effects of prescribed burning on rodent community ecology in Serengeti National Park
Prescribed burning in Serengeti National Park alters rodent community dynamics, with Mastomys natalensis declining and Arvicanthis niloticus increasing in burned areas. While species diversity remained unchanged, reproductive activity in female rodents varied significantly between treatments, peaking in burned plots during March for A. niloticus and M. natalensis. The study employed a randomized design with two treatments (burned/unburned) and two replications, capturing 148 individuals across six rodent species over 2,940 trap nights. Findings suggest conservation strategies should account for small mammal reproductive periods to mitigate adverse effects of burning on at-risk species, ensuring rapid recovery amid reduced food resources and increased predation risks.
Spatial and temporal overlap of caracal and serval in Serengeti National Park, Tanzania
A study in Serengeti National Park, Tanzania, reveals that caracals and servals, two mid-sized nocturnal felids, exhibit high temporal overlap but distinct habitat preferences. Servals favored grasslands while avoiding shrubland and wooded grassland, whereas caracals avoided grassland and woodland-shrubland, though 73% were detected in wooded grassland. The research used occupancy analysis, kernel density estimators, and Mardia-Watson-Wheeler tests to analyze activity patterns from 2010-2012. Findings suggest that differential habitat use facilitates coexistence between the species, with no evidence of competition (Species Interaction Factor, phi = 1). The study recommends managing declining grasslands to support their continued coexistence and calls for further research on feeding ecology.
The precipitation patterns and atmospheric dynamics of the Serengeti National Park
Interactions between tropical easterlies, lake breeze westerlies, and rift topography drive the spatial distribution of precipitation in the Serengeti National Park. This study reveals that the park's rainfall patterns are controlled by a dynamic convergence zone forming in the afternoon, where moist air from Lake Victoria meets easterly winds. The direction of tropical easterlies at 750 hPa determines the progression of diurnal rainfall, with most areas experiencing late-afternoon peaks but an early afternoon peak in the eastern Serengeti during October to March. These findings were derived from high-resolution precipitation and reanalysis datasets (CHIRPS v2.0, TRMM 3B42, ERA5), which quantified regional climatic conditions across annual, monthly, and hourly timescales. Hierarchical cluster analysis identified five sub-regions with distinct rainfall cycles, highlighting the park's spatial heterogeneity.
Applying a random encounter model to estimate lion density from camera traps in Serengeti National Park, Tanzania
A novel approach using the random encounter model (REM) to estimate lion density from camera trap data, without requiring individual recognition, was applied for the first time in Serengeti National Park. The study found that restricting REM estimates to night-time events significantly reduced bias compared to all photographic events, suggesting that animal movement patterns relative to cameras can impact density estimates. This method offers a promising alternative for large carnivore studies but requires reliable measures of movement speed and camera detection zones for accurate results.
Long‐term trends in carnivore abundance using distance sampling in Serengeti National Park, Tanzania
A study analyzing long-term trends in carnivore abundance in Serengeti National Park, Tanzania, reveals significant declines in the densities of golden jackals, black-backed jackals, and bat-eared foxes over a span of decades. Using distance-based transect counts from 2002 to 2005 and adjusted historical data from fixed-width transects conducted in 1977 and 1986, researchers were able to detect these changes despite wide confidence intervals. The study highlights the effectiveness of distance-sampling methods for monitoring multiple carnivore species simultaneously, providing critical insights for conservation management. Notably, abrupt declines of up to 20% in frequently observed species like lions, spotted hyenas, and golden jackals can be detected through long-term monitoring, although larger declines may go unnoticed for less common species.
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