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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Aspects of cheetah (Acinonyx jubatus) biology, ecology and conservation strategies on Namibian farmlands

Marker, Laure January 2002 (has links)
In an increasingly human-dominated environment, the task of successfully conserving large carnivores, such as cheetahs, is difficult due to real or perceived threats resulting in conflict and often their local extirpation. This research describes the causes and potential solutions to this conflict in Namibia. Cheetah biology and ecology were studied through physical examination, laboratory analysis, radio-tracking and human perceptions using survey techniques. Between 1991 and 2000 data collected on over 400 live-captured and dead cheetahs showed that a perceived threat to livestock or game was the reason for 91.2% (n = 343) of cheetahs captured and 47.6% (n = 30) of wild cheetah deaths. Both were biased towards males, with 2.9 males being captured for every female, despite an apparent equality of sex ratio. Human-mediated mortality accounted for 79.4% (n = 50) of wild deaths reported, of which the majority involved prime adult animals, with a peak at around 5-6 years of age. Polymorphic microsatellite loci were used to assess 313 Namibian cheetahs' variation, gene flow, paternity and behavioural ecology. Genetic analysis showed limited regional differentiation supporting a panmictic population and that persistence in Namibia depends on dispersal from regions throughout the country; therefore efforts of connectivity throughout the country should continue. Relatedness values confirmed family groups, and 45 new potential sire/dam offspring and 7 sibling groups were identified, providing information on dispersal and the success of translocation. Sera from wild cheetah were assessed for exposure to feline and canine virus antibodies to CDV, FCoV/FTP, FHV1, FPV, and FCV; antibodies were detected in 24%, 29%, 12%, 48%, and 65%, respectively, showing infection occurs in wild cheetahs; although there was no evidence of disease at time of capture, these diseases are known to cause serious clinical disease in captive cheetahs. Neither FIV antibodies nor FeLV antigens were present in any wild cheetahs tested, however, the first case of FeLV in a non-domestic felid is described in a captive Namibian cheetah. Concern for contact with domestic animals is discussed. Focal Palatine Erosion (FPE), a dental abnormality found in captive cheetahs, was discovered in over 70% of the wild cheetahs and was correlated with dental malocclusions, and is of concern to the long-term health of wild cheetahs. Namibian cheetahs have a mean 95% kernel home range of 1642.3 km<sup>2</sup> (+/- 1565.1 km<sup>2</sup>), the largest home ranges yet defined. Habitat type significantly affected the cheetah's spatial distribution and prey density. Radio-collared female cheetahs were more closely related to other cheetahs in the study area than males, indicating male dispersal. Continual cheetah perturbation may partially explain the unusually low density of cheetahs in this area (estimated at only 2.5 cheetahs per 1000km<sup>2</sup>) despite the apparent abundance of prey. Namibian farmers originally surveyed revealed a mean removal of 19 cheetahs per year/farm, even when not considered a problem, and higher removals occurred on game farms. Evidence for actual livestock depredation was negligible, only 3% of reported captures. Scat analysis revealed cheetahs' selection for indigenous game, however 5% of scats contained evidence of livestock. Research conducted on methods of conflict resolution showed that placing Anatolian Shepherd livestock guarding dogs proved to be effective, with 76% of farmers reporting a large decline in livestock losses since acquiring an Anatolian. Such solutions appear effective in increasing farmer's tolerance for cheetahs, and by the end of the study period cheetah removals dropped to a mean of 2.1 cheetahs/farm/year. Implementing strategies such as these could be significant for reducing human-carnivore conflict in the many other places in which it occurs.
2

Evaluation of spoor tracking to monitor cheetah abundance in central northern Namibia.

January 2007 (has links)
The design, implementation, management and the evaluation of sound conservation practices, is often dependent on the availability of reliable estimates of animal abundance. Large carnivores often pose particular problems in this regard, due to their low densities and wide-ranging behaviour, so the true abundance of such species are seldom able to be reported in literature . As a result, the use of indices of abundance, mostly for relative abundance, has been investigated. However, before these indices can be reliably utilized for conservation purposes , there is a pressing need to calibrate them. As of yet, calibration studies have primarily been performed on demarcated conservation areas, where individuals could be individually identified. Not all these calibrations studies reported indices to be a function of true density. Nevertheless , spoor frequency has been reported to be a function of true density for carnivores in certain Parks in Namibia . Precisely , cheetah spoor density was reported to correlate with visuals in the Kgalagadi Transfrontier Park. The majority of these studies elucidate a species spatial organization, animal behaviour, as the paramount factor determining the relationship between densities estimated via different censusing methods. Thus, the efficiency of spoor frequency to estimate and monitor relative abundance for wild cheetahs is yet to be empirically tested . Despite the lack of a true density estimate for the free-ranging cheetahs in the study area, evaluated spoor tracking as a possible index to monitor relative cheetah abundance using radiotelemetry densities estimates as representative of true abundance for the area, for the 1995 to 2000 period. The study is considered to be opportunistic , and a pillar for future research, as transects where spoor tracking was conducted were layout primarily for ungulates strip counts. Least-linear regression and Spearman's correlation were used to evaluate the relationship between density estimates derived by the two methods. Percentages of change on annual densities were also regressed as a mean to test spoor frequency sensitivity to density changes. The calibration of spoor frequency with estimates of density produced using radio-telemetry, without the ascription of imprints to individual animals, was poor (rs=17.4, y=0.36+0.20). The sensitivity analysis also showed spoor tracking poor reliability to monitor cheetah population. This can be attributed, in order of importance, to the discrepancies on the spatial extent sampled by the two methods, the species large home ranges, substrate quality , habitat preferences, the availability of farm road networks and the transect design, i.e., cyclic. However, the paramount factor limiting the study conclusions was the lack of a more local density estimate at a farm level. Therefore, the use of spoor frequency to estimate wild cheetah relative abundance requires further research, particularly using a different sampling design, longer straight transects and the acquisition of local densities estimates. / Thesis (M.Sc.)-University of KwaZulu-Natal, Pietermaritzburg, 2007.
3

Farmer-related threats to cheetah (Acinonyx jubatus) survival in Namibia.

Orford, Penelope Jane. January 2002 (has links)
This mini-dissertation is a comparison, by repeat survey, of farmer-related threats to cheetah (Acinonyx jubatus) survival on specific commercial farms in central Namibia. The research was conducted, to investigate if there had been changes in these threats to cheetah survival over a ten-year period (June 1991 to October 2001). A sub-sample of 31 farmers who were originally interviewed by the Cheetah Conservation Fund in June 1991, were re-interviewed between July and October 2001. These farmers were exposed to the Cheetah Conservation Fund awareness-raising programme. The results of this survey were compared to the results of the original survey of these farmers. This study showed that changes in farmer-related threats to cheetah survival have taken place. These include changes in land use, the attitude and behaviour of farmers towards cheetah, and cattle management practices. The land use changes include an increase in game farming, as a major source of income, by 19% of the farmers, since 1991. This increase in game farming was associated with an increase in game proof fencing and the introduction of alien antelope species into game fenced areas. The attitude of farmers towards the presence of cheetah on their farms was found to have changed significantly (p = 0.024), with 13% more farmers than before 1991 favouring cheetah presence on their farms. The behaviour of farmers towards cheetah has also changed in favour of cheetah survival. During the ten-year period from 1991 to 2001, 23% of the farmers removed no cheetah, compared to 10% for the ten-year period before 1991. Thirteen percent of the farmers were found to remove cheetah by trophy hunting only, as opposed to none prior to 1991. During the ten-year period from 1991 to 2001, the number of cheetah removed by the same farmers had declined by 243 (55%) cheetah when compared to the previous ten-year period. Game farmers were found to remove on average 3.75 times more cheetah than livestock farmers. Five game farmers were responsible for removing 92 cheetah, representing 47% of the total number of cheetahs removed. The majority (88%) of cattle farmers experienced calf losses to cheetah predation. In contrast to this, only 44% of smallstock farmers experienced losses to cheetah predation. The mean loss of livestock to predation by cheetah was found to be low, less than one animal per year for both calves and smallstock. The majority (73%) of cattle farmers implement only one livestock management strategy to prevent predation on calves by cheetah. The majority (88%) of smallstock farmers implemented more than one strategy to prevent predation. Changes in management practices to protect calves from cheetah predation since 1991 included a 14% decline in farmers using a technique known as 'calving camps' and an increase of 42% in the number of farmers monitoring their cows during the calving season. In conclusion, during the ten-year period from 1991 to 2001, both positive and negative changes in farmer-related threats to cheetah survival were recorded amongst the farmers interviewed. The positive changes include changes in the attitude and behaviour of farmers in favour of cheetah survival. However, this progress was tempered by change in land use from livestock to game farming, since game farmers pose a greater threat to cheetah survival than livestock farmers. / Thesis (M.Sc.)-University of Natal, Pietermaritzburg, 2002.

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