Spatial and Temporal Dynamics of Human–Wildlife Conflicts in the Kenya Greater Tsavo Ecosystem

Biodiversity conservation in developing countries is faced with many and mounting challenges, including increasing human–wildlife conflicts (HWCs). In Africa and other developing countries, increasing HWCs, particularly those adjacent to protected areas, can adversely affect local stakeholder perceptions and support for conservation. We analyzed HWC reports for multiple wildlife species compiled \u3e23 years (1995–2017) from the Greater Tsavo Ecosystem (GTE) in Kenya to determine HWC trends. The GTE is the largest protected area in Kenya, covering 22,681 km2. Overall, 39,022 HWC incidents were reported in 6 GTE regions (i.e., Taveta, Mutomo, Kibwezi, Rombo, Galana, Bachuma). The 5 wildlife species most often implicated in HWC incidents were the African elephant (Loxodonta africana, 61.6%, n = 24,032), nonhuman primates (11.5%, n = 4,480), buffalo (Syncerus caffer, 6.2%, n = 2,432 ), African lion (Panthera leo, 4.2%, n = 1,645), and the hippopotamus (Hippopotamus amphibius, 3.8%, n = 1,497). The HWC reports also revealed spatial distinctions across the 6 GTE regions. More human–elephant conflicts (HECs; 43.3%, n = 10,427) were reported in the Taveta region than other regions. The Mutomo region was the epicenter of primate, snake, and python (Python spp.) conflicts. More large carnivore depredations on livestock were reported in the Taveta, Rombo, and Mutomo regions. Lions, spotted hyenas (Crocuta crocuta), and leopards (P. pardus) were implicated in more livestock depredations than other carnivores. The number of HWCs reported varied by year and season and were related to similar variations in the availability, quality, and distribution of food and water governed by rainfall fluctuations. Reported HECs were positively and linearly related to human, elephant, and livestock population densities. The Kenya Wildlife Service responded to \u3e90% of the reported HWCs. In general, the number of HWCs and trends reported were higher in the regions that also exhibited the highest human population growth rates and densities. Sustainable biodiversity conservation in human-dominated landscapes is contingent upon communities deriving meaningful benefits from wildlife conservation. Far-sighted measures and different conservation approaches are required to mitigate HWCs in communities neighboring protected areas

Human-wildlife conflicts and their correlates in Narok County, Kenya

Human-wildlife conflicts (HWC) are often caused by human population increase, high livestock and wildlife population densities and changing land use and climate. These conflicts are typically most intense in human-dominated systems where people, livestock and wildlife share the same landscapes and during severe droughts. Consequently, HWC are common in developing countries where wildlife still roam outside protected areas, such as in parts of Africa. We analyze how HWC vary across multiple wildlife species, seasons, years, and regions to quantify their extent, causes and consequences using data collected by the Kenya Wildlife Service (KWS) in Narok County of Kenya during 2001–2017. Wildlife species contributed differentially to HWC such that only six species plus non-human primates contributed 90% of all the conflict incidents (n  = 13,848) in the 17-year period. Specifically, the elephant (46.2%), buffalo (10.6%), Burchell's zebra (7.6%), leopard (7.3%), spotted hyena (5.8%) and lion (3.3%), collectively contributed 80.8%, whereas non-human primates contributed 11.7% of all the conflicts. The three most common conflict types were crop raiding (50.0%), attacks on humans (27.3%) and livestock depredation (17.6%). Crop raiding was most acute where cereals (wheat and maize) are grown on large scales. Carnivores were more likely to attack livestock species with body sizes comparable to their own. Thus, the leopard (44.0%, n  = 3,368) and spotted hyena (37.9%, n  = 2,903) killed most sheep and goats whereas the lion (63.1%, n  = 531) and spotted hyenas (14.5%, n  = 122) killed most cattle. HWC showed evident seasonal and inter-annual fluctuations, reflecting underlying rainfall variation. Accordingly, HWC were highest in 2008–2009 when rainfall was lowest in Narok County. Similarly, crop raiding peaked in the late wet season when crops mature whereas livestock depredation was higher in the wet season when natural prey density is lowest. Land conversion to agriculture and increase in human and livestock numbers were all positively associated with increase in HWC. Effective strategies for reducing HWC should be multi-faceted and integrate variation in the intensity and type of HWC between species, regions, seasons and years. Such strategies should discourage habitat conversion but encourage regulating livestock density. Further, they should promote land use zoning to minimize contacts between people, livestock and wildlife; effective livestock herding methods and predator-proof livestock corrals to minimize livestock depredation and fencing farms at greater risk of crop destruction. Keywords: Human-wildlife conflicts, Land use change, Climate change, Human population growth, Livestock density, Wildlife densit

Population trend and distribution of the vulnerable common hippopotamus Hippopotamus amphibius in the Mara Region of Kenya

The common hippopotamus Hippopotamus amphibius can significantly influence the dynamics of ecosystems and engender serious conflicts with people but, in Kenya, one of the species strongholds, it has been little studied or monitored. We surveyed the hippopotamus population in the Masai Mara National Reserve and the adjoining pastoral ranches in 2006 using foot counts along 155.3 km of the main rivers. We counted 4,170 hippopotamuses in 171 schools. Comparisons with earlier surveys suggest that this population increased by 169.6% between 1971 and 1980 within the reserve and, although it did not increase within the reserve during 1980-2006, it increased by 359.4% outside the reserve during this period against a background of deteriorating habitat conditions. The overall density in 2006 was 26.9 hippopotamuses km(-1) of river, equivalent to a biomass of 26,677 kg km of river. The ratio of calves to 100 adults was 9:100 inside the reserve, 10:100 outside the reserve and 6:100 along tributaries of the Mara River, implying that the population is either increasing or that its spatial distribution is being compressed because of range contraction. The apparent increase in the hippopotamus population contrasts with marked contemporaneous declines in the populations of most other large mammalian herbivore species in the Reserve. We discuss possible reasons underlying the increase in the hippopotamus population

Hippopotamus and livestock grazing:influences on riparian vegetation and facilitation of other herbivores in the Mara Region of Kenya

<p>Riparian savanna habitats grazed by hippopotamus or livestock experience seasonal ecological stresses through the depletion of herbaceous vegetation, and are often points of contacts and conflicts between herbivores, humans and their livestock. We investigated how hippopotamus and livestock grazing influence vegetation structure and cover and facilitate other wild herbivores in the Mara region of Kenya. We used 5 km-long transects, each with 13 plots measuring 10 x 10 m(2), and which radiate from rivers in the Masai Mara National Reserve and adjoining community pastoral ranches. For each plot, we measured the height and visually estimated the percent cover of grasses, forbs, shrubs and bare ground, herbivore abundance and species richness. Our results showed that grass height was shortest closest to rivers in both landscapes, increased with increasing distance from rivers in the reserve, but was uniformly short in the pastoral ranches. Shifting mosaics of short grass lawns interspersed with patches of medium to tall grasses occurred within 2.5 km of the rivers in the reserve in areas grazed habitually by hippos. Hence, hippo grazing enhanced the structural heterogeneity of vegetation but livestock grazing had a homogenizing effect in the pastoral ranches. The distribution of biomass and the species richness of other ungulates with distance from rivers followed a quadratic pattern in the reserve, suggesting that hippopotamus grazing attracted more herbivores to the vegetation patches at intermediate distances from rivers in the reserve. However, the distribution of biomass and the species richness of other ungulates followed a linear pattern in the pastoral ranches, implying that herbivores avoided areas grazed heavily by livestock in the pastoral ranches, especially near rivers.</p>