Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"population status"”.
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The Sundarbans tiger: adaptation, population status and conflict management.
… to increase understanding of tiger evolution, population status, and human-tiger conflict. Skulls and body weights of Sundarbans tigers were found to be distinct from other subspecies, indicating that they may have adapted to the unique conditions of the mangrove habitat. Female home ranges, …
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Conservation genetics and population status of the Flame Chub, Hemitremia Flammea
… region was analyzed for 230 individuals from 29 populations across the three drainages. Results from maximum parsimony and Bayesian analyses recovered shallow divergence between the 31 haplotypes. AMOVA analyses indicated that most gene tic variation distributed within and between populations, …
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Pismo Clams (Tivela stultorum) in Califorina: Population Status, Habitat Associations, Reproduction, and Growth
… on key demographic parameters, such as population status, reproduction and growth. Pismo clams (<em>Tivela stultorum</em>) are a culturally important and iconic species in California, which supported a thriving commercial and recreational fishery throughout much of the 1900’s. However, …
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Lion population status and ecology in a seasonally-flooded wetland, the Okavango Delta
… Okavango Delta in north-western Botswana, is a population stronghold for the African lion (Panthera leo). As lion populations are declining, there is a pressing need to develop conservation plans that can secure the future for lion populations in natural environments that face increasing …
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Population Status of Beaver on the Free-running Missouri River in Southeastern South Dakota
… as representative of ages at death in the beaver population. Female survival was 60 percent in age class 0, 69 percent in age class 1, and 34 percent in age classes 2-5. Male survival was 55 percent in age class 0, 74 percent in age class 1, and 31 percent in age classes 2-5. Three estimates of …
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The population status, breeding success and foraging ecology of Phoebetria albatrosses on Marion Island
Seabird populations breeding within the Southern Ocean have experienced various threats over the past few decades. Albatrosses are particularly at risk due to several factors, inter alia, accidental bycatch on fishing gear, ingestion of polluted marine debris, invasive predatory species at breeding …
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Population Status and Characteristics of Macrhybopsis Gelida, Platygobio gracilis and Rhinichthys cataractae in the Missouri River Basin
… collected in the last decade, therefore their status, habitat selection and morphology were investigated at 172 previous collection sites. Data on two ecologically similar species, Platygobio gracilis and Rhinichthys cataractae, were also collected. Macrhvbopsis gelida were collected at 28 …
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Distribution, population status and conservation of the samango monkey (Cercopithecus albogularis schwarzi) in the Limpopo Province, South Africa
… the need for studying forest dwelling primate populations in fragmented landscapes and more specifically in the Soutpansberg is given in Chapter 1. Forests affected by fragmentation are at risk of losing primate populations over the long term. In addition, although the impact of fragmentation …
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Using Noninvasive Genetic Sampling to Assess and Monitor Grizzly Bear Population Status in the Northern Continental Divide Ecosystem
Wildlife managers need reliable estimates of population size, trend, and distribution to recover at–risk populations, yet obtaining these estimates is costly and often imprecise. The threatened grizzly bear (Ursus arctos) population in northwestern Montana has been managed for recovery since 1975, …
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Using Noninvasive Genetic Sampling to Assess and Monitor Grizzly Bear Population Status in the Northern Continental Divide Ecosystem
Wildlife managers need reliable estimates of population size, trend, and distribution to recover at–risk populations, yet obtaining these estimates is costly and often imprecise. The threatened grizzly bear (Ursus arctos) population in northwestern Montana has been managed for recovery since 1975, …
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Population Status and Trends of the Ringed Sawback (Graptemys oculifera) in The Pearl River Drainage of Mississippi and Louisiana
… including five long-term monitoring sites. Population density estimates produced by two mark-resight models (Schnabel and NOREMARK) varied, where estimates were highest in the main-stem of the Pearl River below the Ross Barnett Reservoir and were lowest in tributaries and the West Pearl …
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Assessment of the current population status, genetic diversity and phylogenetic affinities of the rare South African moss, Zygodon leptobolax
… answer the key questions I) what is the current status of Z. leptobolax? 2) what level of genetic diversity exists in the remaining populations? and 3) should these populations be afforded conservation status?
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The population status, breeding success and diet of Subantarctic Skuas two decades after the feral cat eradication on Marion Island
… availability is often the driver behind predator population trends, diet and breeding success. Changes in predator abundance and breeding success represent numerical responses to changes in prey abundance, whereas dietary shifts can be classified as functional responses. Invasive mammals …
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Investigating population status, habitat, and ecological interactions for the Sand Mountain blue butterfly, one of North America's most geographically restricted butterflies
… questions: 1) is the E. p. arenamontana population stable across years? 2) are there habitat features that predict the presence and abundance of caterpillar and adult life stages? 3) to what extent has the vegetation composition changed over the years at Sand Mountain? and 4) which …
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Are black bears declining in Montana? Inference from multiple data sources in the face of uncertainty
<p>Carnivores are managed both to maintain populations and reduce conflict with humans, but data-based decision-making is difficult due to the expense of data collection. When new fieldwork is impossible, we can benefit from available data in assessing populations. I used demographic and harvest …
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Are black bears declining in Montana? Inference from multiple data sources in the face of uncertainty
<p>Carnivores are managed both to maintain populations and reduce conflict with humans, but data-based decision-making is difficult due to the expense of data collection. When new fieldwork is impossible, we can benefit from available data in assessing populations. I used demographic and harvest …
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Estimates of numbers of White sharks (Carcharodon carcharias) in Eastern and Southern South Africa : a post-moratorium assessment
… in South Africa in 1991 prior to knowing the population status of this species. A mathematical model was developed to estimate the total numbers of white sharks from 1950 to 2050 in the presence of fishing (F = 0.055 year-I) and without fishing (moratorium). The total number of white sharks …
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