Habitat Preference and Home Range of Reintroduced Cheetahs (Acinonyx jubatus) in Mkhuze Game Reserve, South Africa.
Mount Allison University, Canada
Dr. Ron Aiken, Mount Allison University
Dr. Mike Perrin, Operation Wallacea Senior Scientist
Dr. Bella Davies, Operation Wallacea GIS supervisor (Week 2)
Dr. Victoria Hobson, Operation Wallacea GIS supervisor (Weeks 3-6)
Abstract Protected areas are established to give endangered species a region to survive, but it is important to assess these areas to determine if they are providing adequate resources for these organisms (Marker etal., 2008). Habitat selection and home range of a reintroduced population of cheetahs, Acinonyx jubatus, were studied in the Mkhuze Game Reserve, South Africa from December 2006 to May 2008. It was expected that cheetahs would have similar habitat preferences to each other and that they would avoid areas of human habitation, while preferring open areas. Home range was not expected to differ according to climatic changes because they are able to live adapt to both wet and arid regions (Caro, 1994; Hunter & Hamman, 2003; Skinner & Chimimba, 2005). Temperature was expected to be relatively constant therefore it should not have influenced home range size. It was found that habitat avoidance was common for all cheetahs, but selection varied from open to closed habitat types. As anticipated, females had larger home ranges than males. Climatic analyses showed such things as temperature and rainfall could influence that home range. These results support previous works, which suggest that the cheetah is a more adaptive species than the scientific world originally thought (Bissett & Bernard, 2007).
Cheetah (Acinonyx jubatus), Coalition, Home range, Habitat selection, Mkhuze.
TABLE OF CONTENTS
Table of Contents ii
List of Figures iii
Materials and Methods 7
Literature Cited 29
LIST OF FIGURES
Figure 1 ArcMap 9.1 projection of the Mkhuze Game Reserve, South Africa 5
Figure 9b Mahlabeni Fixed Kernel Density Estimator 19
Figure 10a Massina Minimum Convex Polygon 20
Figure 10b Massina Fixed Kernel Density Estimator 20
Figure 11a Mavabaza Minimum Convex Polygon 20
Figure 11b Mavabaza Fixed Kernel Density Estimator 20
Figure 12a Coalition Minimum Convex Polygon 21
Figure 12b Coalition Fixed Kernel Density Estimator 21
Figure 13 Rainfall and Home Range Analyses for Coalition and Marakele 22
Figure 14 Temperature and Home Range Analyses for Coalition and Marakele 23
Acknowledgements All of the companies, institutions and individuals that supported my expedition to South Africa. Special thanks to Leadership Mount Allison, Mount Allison University SAC Enrichment Fund and the Explores Club Grant Program.
Amanda MacKenzie, my statistical goddess.
Beka Nxele, Mkhuze Game Reserve: Regional Ecologist
Rodney and Sipo, Safety Officers (Wilderness Research School)
Protected areas are established to give endangered species a region to survive, but it is important to assess these areas to determine if they are providing adequate resources for these species (Marker et al., 2008). Protected areas can be defined by a number of different physical boundaries, but the most commonly used is the fence. These fences are not only free-standing structures but also include guard dogs, noise barriers and even biofences using scents from territorial species. The primary function of these protected areas is to defend biodiversity by eliminating various threats, such as humans and other competing species. They not only protect the flora and fauna of the region but also the ever-encroaching human population from potentially harmful wildlife (Hayward & Kerley, 2009).
Large mammalian predators require large areas of land and the cheetah is no exception (Burdett, 2007; Kelly et al., 1998). These large predators can be a threat to humans and their livestock but this relationship goes both ways. Cheetahs in particular are threatened by humans for the purposes of illegal trade, unregulated captive breeding, and human persecution due to stock-raiding (Hayward & Kerley, 2009; Marker-Kraus, 1997a; Marker-Kraus & Kraus, 1997b). Stock-raiding by cheetahs is a very large concern in north-central Namibia as the preferred refuge for them is commercial farmland with its large prey population and lack of large competitors (Marker, et al., 2008). The KwaZulu-Natal region of South Africa has attempted to resolve these problems with the introduction of enclosed fencing around their protected area to help such animals as the cheetah.
Cheetahs, Acinonyxjubatus, were added to the IUCN Red list first in 1986 and are currently listed as vulnerable (IUCN, 2007). The largest cheetah population is in Namibia with an estimated population size of 2500-3000 adults (Morsbach 1987). Cheetahs were once distributed widely in non-forest areas of Africa, the Arabian Peninsula, the Middle East, Pakistan, India and the southern regions of Russia (Guggisberg, 1975; Caro, 1994; Nowell & Jackson 1996; Marker 1998; Sunquist & Sunquist, 2002; Hunter & Hamman, 2003) and now only exist in small pocket populations throughout Africa and a small group of 40-50 Asian cheetah in Iran, according to a 2004 census (Hunter & Hamman, 2003). Cheetahs were eliminated around 1930 in KwaZulu-Natal but various attempts of reintroduction to the area have occurred, including one in the Mkhuze Game Reserve in 1965 (Hunter & Hamman, 2003) (Figure 1). Until now, the only successful South African reintroduction of the cheetah was in the Phinda Resource Reserve in 1994 (Hunter, 1998; Hunter & Hamman, 2003) (Figure 2).
One way to measure the new resource availability is through home range. The first definition of home range was given by Burt (1943) as the area traversed by an individual during its normal activities of food gathering, mating and caring for young. There are various methods used to determine an individual’s home range. This study focused on the kernel method (Worton, 1989) and the minimum convex polygon method (MCP) (Mohr, 1947), which is the oldest and most commonly used estimator of home range. The kernel method, a utilization distribution (UD) technique, has two subdivisions, fixed and adaptive (Worton, 1989). Utilization distribution techniques allow for habitat utilization to be investigated by determining the frequency of use, as opposed to assuming equal use of the individual’s home range, as is the case for MCP (Katajisto & Moilanen, 2006). For the purpose of this study the fixed kernel density estimator (FKDE) was used to determine home range of each cheetah since his or her re-introduction into the reserve. Although minimum convex polygon method is more commonly used to determine home range, the fixed kernel density estimator is known for being less affected by outliers and includes less unused space (Harris etal. 1990). Both methods were used in this study as the MCP gave a potential area of home range and the FKDE indicated the key habitats essential for protected based on habitat usage.
Bissett and Bernard (2007) found that cheetahs of the Kwandwe Private Game Reserve in the Eastern Cape Province of South Africa occupied different size home ranges based on their sex and their status. These home ranges varied from 32.7 km2 for mature males to 93.9 km2 for independent cubs. It is expected that similar results will be found in the Mkhuze Game Reserve.
A concern for the cheetah population is the number of population bottlenecks the species has experienced. The first of these dates back to nearly 10,000 BC and resulted in genetic disease, deformed jaws and a lack of genetic diversity within the species (Menotti-Raymond & O’Brien, 1993). Recent fragmentation of natural habitat over the last thirty years has introduced more issues, such as population fragmentation, and has been a large concern for the survival of the natural population (Bissett & Bernard, 2007; Marker et al., 2008). Attempts at captive breeding and release have had mixed results but the main issue appears to be human interference (Jule et al, 2008) and low litter survival (Marker, 2008). However, transfer programs, which involve the movement of one individual to another geographic location, are another option, which was exercised in selecting the specimens used in this study.
Biotelemetry, which can be in the form of radio telemetry, acoustic telemetry, or satellite telemetry, is an increasingly common method used by conservation scientists to assist in the understanding of threats and causes of population decline in the assessment of endangered status of species, such as the cheetah (Cooke, 2008; Hulbert & French, 2001; Millspaugh & Marzluff, 2001). This method is known for its ability to avoid problems with observation, such as transportation restraints and animal avoidance (Cooke, 2008). These observation problems result in data that are full of errors and bias, which needs to be avoided in order to show an accurate representation of habit and habitat preference (Cooke, 2008; Hulbert & French, 2001). This method was used not only for it’s convince and ease in data collection, but it has been shown that radiocollars do not influence survival rate or individual fitness of the animals studied (Golabek et al. 2008). The purpose of using biotelemetry is to collect data on an animal to illustrate such things as habitat preference, migration routes and home range that are unattainable with other research methods and to not cause excessive harm to the animal (Cooke, 2008; Hulbert & French, 2001; Millspaugh & Marzluff, 2001).
Most of the data on cheetah’s habitat preference and home range have not taken climate changes into account. However, habitat preference has been found to be different in different parts of Africa (Bissett & Bernard, 2007; Caro, 1994; Marker et al., 2008; Kelley et al., 1998). These studies also have demonstrated together that the cheetah is adaptive to the location that it is in. This study looked to take this information one step further.
The aim of this study was to investigate the habitat selection preference of six introduced cheetahs based on rainfall, temperature and home range. The objectives were threefold: (1) to investigate habitat selection for each cheetah based on point counts in polygons; (2) to determine home range for each cheetah using minimum convex polygons and fixed kernel density estimator; (3) to investigate the affects of rainfall and temperature on the habitat selection of each cheetah.
Figure 1 – Radio tracking study area and habitat map of the Mkhuze Game Reserve, South Africa. Park measures 35,740 hectors in area and is part of the KwaZulu-Natal chain of game reserves (Latitude: -27, Longitude: 32).
Figure 2 – Map of South Africa. (http://www.sowetotour.co.za/images/enlarged/map_southafrica.gif)
Beginning in early October 2006, six cheetahs, two males and four females, were released into the Mkhuze Game Reserve in KwaZulu-Natal of South Africa after spending five weeks in the boma (located just before Mkumbi; Figure 1) and being fitted with radio collars. Two males from the Develdt cheetah-breeding center in the Northern Province of South Africa were released in October, and two female cheetahs known as Mavabaza and Mahlabeni from the neighboring park of Phinda were brought in and released from the boma in December. The final two females, Marakele and Massina, who were named after the two private parks that they were bought from, were released on the 15th of January 2007. The males were not named until June 2008; male cheetah two was named Wallace but male cheetah one was never named as he was killed by hyena on May 11th, 2008. On May 12th 2008, the female cheetah known as Massina was also found dead due to a hyena attack after she had fallen into a hole. Before her death she had successfully raised two male cheetahs from the previous year’s litter. Data were first collected for the young cubs on May 10th 2008, and one was fitted with a collar on July 27th 2008. As the brothers are a coalition, only one needed to be collared, as they will stay together until one dies. Data collected on these males was not used in this analysis. Mahlabeni gave birth to four cubs in February 2008; they will be collared if they reach adult size.