The ability to determine the prey-specific biomass intake of large predators is fundamental to their conservation. In the absence of actual prey data, researchers generally use a "unit mass" method (estimated as 3/4 adult female mass) to calculate the biomass intake of predators. However, differences in prey preference and range across geographic regions are likely to have an influence on biomass calculations. Here we investigate the influence of estimated prey mass on leopard biomass calculations, and subsequently carrying capacity estimates, in an understudied mountain population.Potential leopard feeding sites were identified using global positioning system (GPS) location clusters obtained from GPS collars. We investigated 200 potential leopard feeding sites, of which 96 where actual feeding sites. Jaw bones, horns, hooves, and other indicative bones were used to determine gender and age of prey items, which were subsequently used to calculate mass of each prey item based on previously published values. There were significant differences in the biomass values calculated using the traditional unit mass method and the calculated prey masses obtained from leopard feeding sites. However, there were no considerable differences in the carrying capacity estimates using the preferred prey species model and leopard density estimates calculated using a nonbiased spatial approach, which suggests that estimating carnivore carrying capacity based on 3/4 adult female masses is a reliable method, also for the mountain population in this study.
Foraging data for terrestrial carnivorans are most often obtained by the analysis of faecal samples -an established technique. However, advances in satellite tracking technology are allowing researchers to locate kill sites by investigating global positioning system (GPS) clusters in both space and time. Here we compare leopard Panthera pardus dietary estimates (composition and biomass) of small, medium and large prey using three techniques: faecal analysis, GPS cluster analysis and GPS cluster analysis supplemented with faecal samples located at cluster sites. We demonstrate that estimates of leopard prey composition and biomass intake from each technique produce comparatively similar results. Nevertheless, the detection of feeding events did increase by 20-23% when supplementing GPSlocated kills with faecal samples. The investigation of GPS clusters offers an equivalent method of leopard dietary estimation to that of faecal analysis. When carried out intensively, the GPS cluster method is capable of detecting leopard predation on prey species within small, medium and large weight categories. Although requiring additional resources, supplementing GPS-located kills with GPS-located faecal samples results in the most detailed dietary estimates by detecting kills missed during GPS cluster investigations.
Leopards do not preferentially favour baboons as prey, but they are considered the primary predators of baboons across Africa. Even in areas where baboons are abundant, their contribution to leopard diet seldom exceeds 5% of biomass. It is suggested that the extreme aggressiveness of baboons, group vigilance and their high mobility when escaping may limit leopard predation. Male baboons are particularly aggressive, and retaliation often leads to the death of the leopard. However, evidence suggests that leopards may learn to catch and kill certain dangerous prey. This study reports predation on chacma baboons by 3 female leopards on a private game reserve in the Waterberg Mountains of South Africa. Potential leopard feeding sites were identified using global positioning system (GPS) location clusters obtained from GPS collars. Over a 5-month period, we investigated 200 potential leopard feeding sites and located 96 leopard feeding/kill sites. Baboons constituted 18.7% of the leopards' biomass intake. The majority of baboons preyed upon were adults and 70% of the kills were diurnal. In terms of the measured variables, there were no significant differences in the way the leopards preyed upon baboons, compared to the rest of the prey species.
This article reports on an exploratory study that used metaphoric objects as a therapeutic aid. During Rogerian therapy sessions, a metaphoric object was handed to clients. The metaphoric object was used as a reflection of an aspect of the client's being. The clients were asked to describe the effect the object had on them. The protocols obtained were subjected to a phenomenological analysis. The study indicates that metaphoric objects can be a useful therapeutic aid.
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