Invasive alien species are considered the second greatest threat to global biodiversity after habitat loss. South Africa is not immune from such threats and it is estimated that 10 million ha (8.28%) of land has been invaded to some extent by invasive alien species. Although South Africa has been invaded by several taxa, it is the effect of invasive trees and shrubs that has been environmentally and economically most damaging. The concerns raised due to the effects of biological invasion are not only restricted to off-reserve areas, but also protected areas where invasive alien organisms often pose a greater threat than habitat loss. Kruger National Park (KNP), South Africa’s flagship conservation area has been invaded by numerous plant taxa. The most damaging of these is Opuntia stricta (Cactaceae) and current sources estimate that the weed has invaded approximately 35 000 ha of conserved land, despite the initiation of a biological control programme against it. However, little is known about the effect of O. stricta on biodiversity in the KNP despite the large number of resources allocated to its eradication, including a successful biological control programme against it. In this study, I investigated the effect of O. stricta infestation on beetle (Order Coleoptera) and spider (Order Araneae) assemblages across four treatments of varying O. stricta infestation levels (heavy infestation, medium infestation, surrounded sites and pristine sites). Species characteristic of each treatment (indicator species) were identified using the indicator method. In addition, spiders were collected to gauge the effectiveness of three collecting methods (pitfall traps, leaf litter sifting and active searching) in a savanna characterized by O. stricta invasion. One hundred and thirty one spider species (1050 individuals) and 72 beetle species (2162 individuals) were collected in the treatments. I found no significant differences in species richness, species density and species assemblages for both beetles and spiders across the treatments. In addition, no beetle or spider species were found to be characteristic indicator species for a given treatment, which further indicates that arthropod assemblages are similar when compared across treatments. These results indicate that O. stricta does not appear to have a significant effect on beetle and spider assemblages at its current infestation level, possibly because of the similarity in vegetation structure across the treatments. Regarding spiders, different collecting methods captured different species and only 17% of the species were shared, indicating that the methods complement each other. Therefore, in order to sample the spider community, all three methods should be employed. Of the 131 spider species collected, 54 species (41%) are new records for the KNP. In light of the results, it is suggested that KNP’s successful biological control programme has played an important role in reducing the extent of the O. stricta infestation and should be continued to further mitigate the impacts of O. stricta. / Dissertation (MSc)--University of Pretoria, 2009. / Zoology and Entomology / unrestricted

In the Kruger National Park (KNP), pansteatitis in sharptooth catfish, Clarias gariepinus (Burchell), was shown to be a serious problem in the inlets to large man-made lakes fed by rivers arising in the polluted catchments of the Olifants and Sabie rivers. An increasing prevalence of pansteatitis was recorded in catfish from the Olifants River gorge. A low prevalence was found in catfish upstream of the gorge at two further sites. No pansteatitis was detected in catfish from a rain-filled dam distant from the potential pollution sources affecting the Olifants River and in rivers arising outside of the park that were not dammed. Analysis of stomach content indicated a higher prevalence of fish in the diet of catfish affected by pansteatitis than in those not affected. Significant pathology in catfish was limited to changes associated with a generalised necrosis and inflammation of adipose tissues (pansteatitis), and there was evidence that lesions accumulated over time. Similar pathology was found in a captive population of catfish with known nutritional pansteatitis. Pathology in other organs that might have been attributed to pollution could not be demonstrated. Examination of blood smears and measurement of haematocrit, blood haemoglobin, serum vitamin E and erythrocyte glutathione peroxidase values did not prove useful as monitoring tools, probably because of the episodic exposure to oxidative stress and the chronic nature of the condition. Pansteatitis-affected catfish, kept in an experimental pond for 11 months after the inciting nutritional cause had been removed, retained steatitis lesions almost unaltered. Whereas lipolysis appeared to be reduced by pansteatitis, adipogenesis appeared to be unaffected. Juvenile catfish confined in experimental tanks with sediments from sites where pansteatitis occurred remained healthy, and no pathology developed after 14 months, suggesting that sediments were not directly toxic. The results of the study present the first record of pansteatitis in both wild and farmed African sharptooth catfish and emphasize the ecological importance and complexity of nutritional oxidative stress in a disturbed aquatic environment. Nutrient entrapment and the consumption of phytoplankton-feeding fish rich in polyunsaturated fats, particularly silver carp, Hypophthalmichthys molitrix (Valenciennes), a species alien to Africa but present in the Olifants River, is proposed as the dietary cause of the pansteatitis. / Thesis (PhD)--University of Pretoria, 2012. / Paraclinical Sciences / unrestricted

Responsible Tourism (RT) implies that all parties involved in the tourism sector are responsible for making sure that all activities taking place are of a sustainable nature, and that consideration is given to environmental conservation, economic growth and social integrity. The Kruger National Park (KNP) and the South African National Parks (SANParks) are key role-players in the tourism and conservation sectors in South Africa, and have acknowledged and started to implement Responsible Tourism practices into their strategic model. One major hurdle in reaching their RT goals is a lack of funding, which they are currently addressing by expanding and diversifying their tourism product offerings. As stakeholders play a key role in RT, this study aimed to determine stakeholder perceptions of RT development in the KNP, in order to assist SANParks achieve their RT goals. The philosophical assumption under which this study was undertaken was the pragmatic research paradigm, in which one aims to understand the truth concerning whatever questions are investigated. The methodology was applied through questionnaires that were completed by KNP visitors, and interviews based on SANS 1162:2011 that were conducted with KNP employees. The study found that there is some misalignment between RT aspects that visitors consider as important, and those that are highlighted in SANParks' strategic documentation. It was also noted that despite generally good performance with regard to RT aspects, employees find that insufficient funding and the lack of awareness of stakeholders are two of the challenges faced in achieving RT. In order for SANParks to reach their RT goals, they can consider addressing these gaps, as the core of RT is that of behaviour and actions taken. Emphasis must be on how all those involved in the KNP and SANParks can alter their behaviour to make better places for people to live in, and better places for people to visit. / Environmental Sciences

The ecology of bighorn sheep in Canyonlands National Park, Utah was investigated between July 1974 and December 1975. Primary objectives of this study were: (1) to determine the distribution and abundance of bighorn sheep in the Park; (2) to examine the effects of human encroachment, and (3) to determine key habitat factors in relation to bighorn sheep movements. Data were collected by ground and aerial surveys. There were between 60 and 100 bighorn sheep in the Island in the Sky District and between 20 and 30 in the Needles District. Bighorn sheep distribution was closely related to the history of livestock grazing and landform characteristics of the canyons. Human activities have restricted bighorn ewe distribution more than ram distribution. Bighorn ewes were observed in canyons which were not used by domestic livestock or where much of the canyon was isolated from domestic livestock. Deer and bighorn sheep demonstrated different landform preferences. Deer occupied large level areas, washes, and river bottoms. Bighorn sheep remained on the more rugged terrain, moving to level areas to feed. In canyons which were completely isolated from deer and livestock, bighorn sheep preferred t he broad level areas and washes. Bighorn ewes did not demonstrate seasonal movements, whereas rams had definite movement patterns. In the southern portion of the Island in the Sky District , rams formed small bands and remained in a series of four canyons throughout the late winter and spring . In June, these rams dispersed individually or in pairs to higher elevations. During October they returned to the canyons below the White Rim to search for ewes. In the eastern portion of the Island in the Sky District, mature rams remained below the White Rim only during the rut, dispersing to higher elevations for the rest of the year. Physical barriers may minimize the impact of tourism upon bighorn sheep. If bighorn sheep were above or unable to see the source of disturbance , the impact was not as great as when bighorn were able to see the source. This may explain the tendency for bighorn ewes to quickly retreat when vehicles approached them on the White Rim Road where few physical barriers are present. Human encroachment also decreases the energy intake and increases the energy output of bighorn sheep. Bighorn sheep appear to be at equilibrium with the current range they inhabit. The National Park Service should monitor the use of the White Rim Road to evaluate effects on the bighorn sheep and restrict hiking below the White Rim to minimize stress on the bighorn sheep within this range. Studies should be initiated to investigate the bighorn sheep expansion of its range within the Park as a result of the cessation of lives tock grazing, and the role tourism plays in limiting it.

A comprehensive fuel load assessment of all plant communities in Bryce Canyon National Park is provided. Fuel loads by community type are pooled into "fuel type associations" based on similarity in predicted fire behavior, and the fuel type associations are mapped throughout the Park. For each fuel type association, a series of fire behavior simulations is presented describing expected rates of spread and intensities for typical conditions in each month of the fire season and for a worst-case scenario. These fire behavior predictions provide guidelines for writing prescribed burning prescriptions or for quickly assessing the need for possible fire suppression and the amount of effort required to suppress particular fires.

Few lithic analyses have been conducted or published on collections from Mount Rainier National Park (MORA). This study's lithic debitage analysis, and investigation of hunter-gatherer technological organization through time, contributes to the knowledge base and understanding of how hunter-gatherers used subalpine environments in MORA. The debitage sample is from archaeological excavations between 2005 and 2007 at a Buck Lake Site (45PI438) activity area in the subalpine environmental zone. Two cultural components were examined: the pre-Mount St. Helens Yn tephra component (before 3500 RCYBP) is thought to represent a forager-like mobility strategy and the post-Mount St. Helens Yn tephra component (after 3500 RCYBP) is thought to represent a collector-like strategy. Expectations theoretically grounded in hunter-gatherer mobility, tool design, raw material procurement, site function, and tool function were developed and tested. Results suggest that hunter-gatherers at Buck Lake relied on and maintained small, lightweight, transported bifaces made of nonlocal raw material regardless of expected changes in mobility strategy through time. For both foragers and collectors at Buck Lake, similar lithic raw material availability, terrain, and seasonality constraints and a common resource acquisition goal and overlapping site function resulted in similar hunter-gatherer technological organization strategies. Slight differences between the cultural components include: the use of more local igneous raw material in the forager-like component, the use of a more expedient technology in the collector-like cultural component, and smaller size debitage in the forager-like component. The use of expedient bipolar technology in both cultural components is possible, but only partially supported. Evidence of bipolar technology would suggest that hunter-gatherers were conserving nonlocal CCS by using the bipolar technique on exhausted transported tools or cached cores to produce expedient flakes used for small-game hunting and processing. Further research for the Buck Lake site should include: the sourcing of raw material; conducting experimental lithic reduction on toolstone found at Buck Lake to produce comparative debitage specimens; and increasing the lithic analysis sample size to include debitage recovered from 2008-2009 excavations and other artifact types.

No description available.

<p> Systematic soil sampling and analyses provided DDT, DDE and DDD, organic and mineral matter concentrations, as well as various soil physical and hydraulic properties from three study sites at Point Pelee National Park. A soil's physical properties, soil and water management practices, and DDT application history, can affect DDT degradation and change the relative amount of its metabolites. DDD is the principal product of the dechlorination of DDT in high moisture content, reducing anaerobic soil environments. The main degradation product in soils under aerobic conditions is DDE. %DDT, %DDE and %DDD abundances used in conjunction with soil environment characterization data, can be used to indicate not only whether DDT is degrading, but what environmental factors are controlling its degradation. At the Park, DDT is primarily lost from the soil by microbial degradation to DDE and DDD. %DDT, %DDE and %DDD ratios from each study site indicated that wetter more organic-rich soil environments degraded DDT to its metabolites at a faster rate than drier less organicrich soils. Moreover, historical water level data was used to illustrate that this wetter study site was flooded for part of the year when adjacent marsh water levels were high. These conditions resulted in the accumulation of organic matter over time and the creation of alternating anaerobic/aerobic conditions in the soils resulting in an increased rate of degradation of DDT in these areas. Based on the relative %DDT in the soils at each study site, relative half-life estimates for the first order decay of DDT to its metabolites DDE and DDD were calculated. Half-life estimates for DDT at the wettest and most organic-rich study site range from 6 to 8 years; significantly lower than the two other study sites, which range from 15 to 30 years and are on the high end of the range reported in the literature.</p> / Thesis / Master of Science (MSc)

1 Abstract Legal Regime of National Parks in the Czech Republic and the Kingdom of Spain National parks as traditional instruments of in situ nature protection, which ensure the protection of the most valuable natural values of the state, have long been a socially debated topic that deserves repeated attention. The fact that this is a current and fundamental issue is proved by the fact that both legal regulations examined in this thesis have undergone extensive changes. The Czech regulation of national parks was amended completely in 2017 and the Kingdom of Spain adopted a new law on national parks in 2014, also in response to a long-standing dispute between the autonomous regions and the central government over jurisdiction over specially protected areas. The aim of this work is to present and analyze the basic legal concept of national parks in the Kingdom of Spain and the Czech Republic, sources of legislation, tools used for nature protection, their anchoring in legislation and institutions related to the administration of national parks. Based on the performed analysis, a comparison of individual institutes is performed, their identical and different elements are evaluated and some changes de lege ferenda are proposed. This thesis is divided into eight chapters. The first chapter describes the...

In 2017 the Kenow wildfire burned thirty-eight percent of Waterton Lakes National Park (WLNP) in southern Alberta at high to very high severity in mere hours. The ecological impacts of the fire will have implications for resource management, including the practice of ecological restoration, for decades to come. In this thesis I ask two main questions. First, in what ways are people who are involved in managing WLNP’s ecosystems experiencing the effects of the Kenow wildfire, and how does their experience combined with the severity and extent of the Kenow wildfire influence park management and ecological restoration approaches in WLNP? Subsidiary to this, I ask, what is the role of history, and the role of future climate projections in managing the post-fire landscape? This research is part of the larger Mountain Legacy Project (MLP), which is systematically repeating historic survey photographs taken in the early 1900s across Canada’s mountain landscapes. I use third-view photographs in photo-elicited semi-structured interviews with park staff to answer my first question. In my second research question I ask what broader themes and specific issues do third-view repeat mountain photographs elicit about ecological restoration and park management. As a follow up, I inquire into what ways photo-elicitation functions as an effective method in park management research? Fourteen participants were interviewed, the majority were resource conservation staff, in addition to one retired park warden, a member of the cultural resources unit, a communications staff, and a former staff member. Participants felt wide-ranging emotions relating to the Kenow fire including grief over loss, happiness about regrowth, excitement about learning, anxiety about people’s safety, and stress over increased workloads. Park management frames vegetation regeneration after the Kenow fire as renewal, accepting that the landscape may look different than it did before the fire. Climate change is only beginning to be integrated into ecological restoration, though park management is adapting to climate change by encouraging renewal under a new climate. Historical knowledge still guides decision making in several ways. Major restoration projects including invasive species management, whitebark and limber pine restoration, and prescribed burning, were all impacted by the Kenow fire. Participants shared their thoughts on unconventional approaches such as novel ecosystems, highlighting misunderstandings and misapprehensions about the concept. Parks Canada has an opportunity to learn from Waterton Lakes’ experience to help streamline their post-emergency response in the future. Findings relating to my second question show these themes and issues were discussed most often by participants when looking at the third-view mountain photographs: fire behaviour, regeneration/renewal, and ecological impacts of the Kenow fire; encroachment; prescribed burning; personal narratives; ecological effects of climate change; and other snapshots. Just less than half the participants did not engage significantly with the photos, which highlights a challenge in using researcher chosen photos. However, many participants did engage and had much to say about the photos, including sharing memories and personal stories. Pre-determined interview questions were essential in unearthing the findings in this thesis, as the photos did not elicit this information alone. / Graduate