Trends in Cheetah Acinonyx Jubatus Density in North‐Central Namibia
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Received: 30 September 2018 Revised: 24 November 2019 Accepted: 8 January 2020 Published on: 26 February 2020 DOI: 10.1002/1438-390X.12045 ORIGINAL ARTICLE Trends in cheetah Acinonyx jubatus density in north- central Namibia Ezequiel Chimbioputo Fabiano1 | Chris Sutherland2 | Angela K. Fuller3 | Matti Nghikembua4 | Eduardo Eizirik5,6 | Laurie Marker4 1Department of Wildlife Management and Ecotourism, University of Namibia, Abstract Katima Mulilo, Namibia Assessing trends in abundance and density of species of conservation concern 2Department of Environmental is vital to inform conservation and management strategies. The remaining Conservation, University of population of the cheetah (Acinonyx jubatus) largely exists outside of protected Massachusetts-Amherst, Amherst, Massachusetts areas, where they are often in conflict with humans. Despite this, the population 3U.S. Geological Survey, New York status and dynamics of cheetah outside of protected areas have received rela- Cooperative Fish and Wildlife Research tively limited attention across its range. We analyzed remote camera trapping Unit, Department of Natural Resources, Cornell University, Ithaca, New York data of nine surveys conducted from 2005 to 2014 in the Waterberg Conser- 4Ecology Division, Cheetah Conservation vancy, north-central Namibia, which included detections of 74 individuals Fund, Otjiwarongo, Namibia (52 adult males, 7 adult females and 15 dependents). Using spatial capture– 5Laboratório de Biologia Genômica e recapture methods, we assessed annual and seasonal trends in cheetah density. Molecular, Escola de Ciências, Pontifícia We found evidence of a stable trend in cheetah density over the study period, Universidade Católica do Rio Grande do 2 Sul, Porto Alegre, Brazil with an average density of 1.94/100 km (95% confidence interval 1.33–2.84). 6Instituto Pró-Carnívoros, Atibaia, Brazil This apparent stability of cheetah density is likely the result of stable and abun- dant prey availability, a high tolerance to carnivores by farmers and low turn- Correspondence Ezequiel Chimbioputo Fabiano, over rates in home range tenure. This study highlights the importance of Department of Wildlife Management and promoting long-term surveys that capture a broad range of environmental varia- Ecotourism, University of Namibia, tion that may influence species density and the importance of nonprotected Private Bag 1096, Winela Road, Katima Mulilo, Namibia. areas for cheetah conservation. Email: [email protected] KEYWORDS Funding information Acinonyx jubatus, camera trapping, density, scent posts, spatial capture-recapture Coordenaç~ao de Aperfeiçoamento de Pessoal de Nivel Superior—Brasil (CAPES), Grant/Award Number: Finance Code 001 1 | INTRODUCTION less than 10% (Durant et al., 2017; Wolf & Ripple, 2017). This reduction in cheetah range is the largest among the Apex predators play a major role in ecosystem functioning large carnivores of greatest conservation concern (Wolf & (Estes et al., 2011), but worldwide most carnivore Ripple, 2017). Such losses can alter ecosystem functions populations are rapidly declining both in distribution and (Ripple et al., 2014), affect humans through the loss of abundance (Wolf & Ripple, 2017). For example, the leopard income from ecotourism, and changing disease dynamics (Panthera pardus) now occurs in only 37% of its historical (Ordiz,Bischof,&Swenson,2013;vanderMeer,Badza,& range (Jacobson et al., 2016), the lion (Panthera leo)in25% Ndhlovu, 2016). Thus, it is important to assess trends in (Riggio et al., 2013) and the cheetah (Acinonyx jubatus)in density of large carnivores over multiple generations in Population Ecology. 2020;62:233–243. wileyonlinelibrary.com/journal/pope © 2020 The Society of Population Ecology 233 234 FABIANO ET AL. order to improve our understanding of species response to using spatial capture–recapture methods (SCR, Royle, temporal variation in environmental conditions (e.g., Fuller, & Sutherland, 2018, Fabiano, Boast, Fuller, & changes in prey availability or habitat structure), assigning Sutherland, 2018). To date, SCR-derived density estimates conservation status to species, and devising comprehensive for cheetah have been reported for Botswana (Boast, conservation strategies. Reeves, & Klein, 2015; Brassine & Parker, 2015) and Namibia has the second largest population of chee- Kenya (Broekhuis & Gopalaswamy, 2016) but not yet for tahs across the species range (Marker, Boast, & Schmidt- Namibia. Küntzel, 2018), with approximately 95% of individuals In this study, we use a unique 9-year camera trapping occurring in freehold and communal farmlands, that is, data set collected on commercial farmlands in north-central areas without formal protection status (Marker-Kraus, Namibia to quantify temporal trends in cheetah density, Kraus, Barnett, & Hurlbut, 1996). As a result of human– and to investigate aspects of their spatial ecology including cheetah conflict, cheetahs are killed or translocated to sex- and season-specific space use. This region is of signifi- farms where owners are more tolerant (henceforth cance for cheetah conservation in Namibia as it is consid- referred to as “removed”) due to perceived or true conflict ered to have the highest density in the country (Marker, with farmers (Marker-Kraus et al., 1996), but removals are Dickman, Wilkinson, Schumann, & Fabiano, 2007). Sam- reported to have reduced significantly (Marker, Dickman, plingthisareaacrossmultiple years and seasons offers Mills, Jeo, & Macdonald, 2003). The decline in removals is important insights into the existence, if any, of interannual primarily attributed to the growth and engagement of non- or seasonal patterns in density(e.g.,populationtrends,or governmental organizations with farmers (e.g., Cheetah transience, respectively) and spaceuseinrelationtotempo- Conservation Fund, AfricCat, World Wildlife Fund, ral variations in environmental conditions, life history strat- Namibia Association Community Organization), training egies (e.g., home range tenure), and indirectly, the impact and capacity building in local communities, and the estab- of conservation interventions. Our prediction was that this lishment of commercial and communal conservancies population was stable given the various conservation initia- (Marker & Dickman, 2003). Conservancies consist of adja- tives in the study area. We discuss our findings in the con- cent landowners that voluntarily manage their lands sus- text of requirements for continuing to promote effective tainably as a single unit while accruing direct (e.g., trophy conservation measures for carnivores, the importance of hunting, employment) and/or indirect (e.g., building of long-term monitoring, and the need to replicate this study clinics) benefits (NACSO, 2015). Approximately 42% of the across Namibia and elsewhere. total land in Namibia is under some form of conservation, including 6 and 20% in freehold and communal conser- vancies, respectively (NACSO, 2015). Thus, conservancies 2 | METHODS have been critical in transforming the Namibian landscape into a conservation-oriented country, and they can play a 2.1 | Study area significant role in preventing further population declines of large carnivores. Camera-trapping surveys were located in the Waterberg A critical aspect of conservancies is the promotion of Conservancy in north-central Namibia in the Otjozondjupa sustainable wildlife management practices informed by region (202805600S17202400E, Figure 1). The area is semi- long-term population monitoring. Monitoring is con- arid with annual rainfall of 400–500 mm concentrated dur- ducted through indices (e.g., counts at waterholes and ing the summer season (November to February) (Barnard, track counts) and direct observations (e.g., distance sam- 1998). The study area is an unfenced, free-movement area pling) (NACSO, 2015), but these techniques are often characterized by thornbush and tree and woodland savanna inappropriate for monitoring carnivores such as cheetah vegetation (Geiss, 1971) where bush encroachment was unless they are calibrated (Funston et al., 2010). Addi- prevalent (Barnard, 1998). Primary land use practices tionally, cheetahs are wide-ranging, elusive and occur at include livestock (cattle and small stock) farming and wild- low densities (Marker, Fabiano, & Nghikembua, 2008) life ranching, including fenced game farms, eco-tourism making monitoring challenging. Thus, there is a lack of and trophy hunting (Marker-Kraus et al., 1996). The area information on trends in cheetah abundance and density supports a diversity of ungulates, most of which are at all spatial scales (local or regional) in Namibia and included in the cheetah diet including kudu (Tragelaphus across its range (but see Durant et al., 2011). strepsiceros), eland (Taurotragus oryx), springbok (Anti- Remote camera traps are often employed to obtain dorcas marsupialis), steenbok (Raphicerus campestris), scrub individual encounter data for species with individually hare (Lepus saxatilis), oryx (Oryx gazella), red hartebeest identifiable pelage patterns, such as cheetahs. These data (Alcelaphus buselaphus), warthog (Phacochoerus africanus) can be used to generate spatially explicit density estimates and springhare (Pedetes capensis). Carnivores in the study FABIANO ET AL. 235 area sympatric with the cheetah include black-backed radius of a female cheetah in the study (Marker, Dickman, jackal (Canis mesomelas), brown hyaena (Hyaena brunnea), Mills, Jeo, & Macdonald, 2008). Additionally, historical daily caracal