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 112 for “"Critically Endangered"”.
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Impacts of degradation on critically endangered Oudtshoorn Gannaveld
… Gannaveld and the impacts of degradation on this critically endangered vegetation type. The diversity of this vegetation type is added to by the occurrence of mima-like circular soil mounds, termitaria, which support distinctive plant assemblages. Perennial plant data and soil data were collected …
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Management of critically endangered renosterveld fragments in the Overberg, South Africa
… for agricultural development, rendering it a Critically Endangered vegetation type, with 4- 10 % of the original extent remaining.In this thesis, I focus on lowland renosterveld in the Overberg (also referred to as South Coast Renosterveld), Western Cape, South Africa. I investigate, through …
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Non-invasive monitoring for population assessments of a critically endangered Neotropical primate
… northern muriqui (Brachyteles hypoxanthus), is a Critically Endangered primate endemic to the Atlantic Forest of Brazil. Remnant populations of muriquis suffer from a wide range of anthropogenic pressures and face a high risk of extinction due to demographic and environmental stochasticity. …
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Population dynamics and population genetics of the Critically Endangered Raso lark: implications for conservation
The Raso lark is a Critically Endangered bird endemic to the islet of Raso, Cape Verde. This thesis investigates two phenomena that particularly put the species at risk: its extreme fluctuations in population size, and its potentially very low genetic diversity arising from small population size …
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Monitoring and mapping the critically endangered Clanwilliam cedar using aerial imagery and deep learning
The critically endangered Clanwilliam cedar, Widdringtonia wallichii, is an iconic tree species endemic to the Cederberg mountains in the Fynbos Biome. Consistent declines in its populations have been noted across its range primarily due to the impact of fire and climate change. Mapping the …
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Using thermal imaging data to explore behaviour in a critically endangered frog species, Craugastor ranoides
Understanding a species behaviour, in particular behavioural thermoregulation, is important as it can indicate how well the species will adapt to changing environments, such as climate change. Ectotherms are particularly vulnerable to the effects of climate warming as they rely on environmental …
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Effects of fire frequency and seasonality on the population dynamics of the critically endangered Clanwilliam cedar
… conservation status subsequently escalated to critically endangered in 2013 by IUCN Red List of Plants. Studies have hypothesised that excessive exploitation for timber products, climate change and unfavourable fire regimes (frequency, intensity and season) have contributed to this species’ …
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The Role of Symbiotic Bacteria in Disease Resistance and Conservation of the Critically Endangered Panamanian Golden Frog
Amphibian populations have undergone unprecedented declines in recent decades. Many of these declines are due to the spread of the cutaneous fungal pathogen Batrachochytrium dendrobatidis (Bd), which causes the disease chytridiomycosis. The Panamanian golden frog (Atelopus zeteki) has not been seen …
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Parental Attitudes Towards Early Childhood Education in Lower Sorbian: Challenges in Developing Bilingualism in a Critically Endangered Language
… of Lower Sorbian. Lower Sorbian or Wendish is a critically endangered West Slavic minority language spoken in the area around Cottbus, a town in eastern Germany near the Polish border. As intergenerational transmission of Lower Sorbian has virtually ceased, bilingual education in daycare centres …
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Exploration of climate mediated decline in a critically endangered southern hemisphere conifer over the last 40 years / Annabelle J. Rogers
Widdringtonia cedarbergensis is a critically endangered conifer restricted entirely to the Cederberg Mountain range in the Western Cape of South Africa. This study aimed to assess whether contemporary climate change could be a driver in the recently documented tenfold decline of W. cedarbergensis …
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Searching for answers to the silent decline: first estimates of survival and recruitment for the critically endangered Rose's mountain toadlet, Capensibufo rosei
Capensibufo rosei, a critically endangered bufonid found only within Table Mountain National Park, has shown a silent decline over recent decades, despite being found within a protected area with apparently pristine habitat. I estimated the first survival and recruitment rates for the species, …
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Development and Use of an Environmental DNA Tool to Monitor Recovery of the Critically Endangered Smalltooth Sawfish, Pristis pectinata, in the Northwest Atlantic
<p>The Critically Endangered Smalltooth Sawfish, <em>Pristis</em> <em>pectinata</em>, was once common in the tropical and subtropical waters of the Atlantic Ocean; however, following global declines in range and abundance over the past century, individuals were restricted to the waters of south and …
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Assessing the global conservation status of ecologically poorly undertood, threatened chelonian species : the case of the critically endangered Madagascar spider tortoise (<i>Pyxis arachnoides</i>)
… one such species, up-listed from Vulnerable to Critically Endangered status, based on data of limited spatial resolution and anecdotal information, suggesting risk from poaching and habitat loss, resulting in significant reduction in population size, thus allowing the criteria of Critically …
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Behavioral Ecology, Taxonomy, and Conservation Genetics of the Bahama Oriole (Icterus northropi)
… of developing a sound management plan for this critically endangered bird. In the first of five studies, I measured plumage variation among four allopatric populations of the former Icterus dominicensis complex in the Caribbean. Diagnosable plumage differences among populations contributed to …
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A systematic conservation assessment of habitat transformation and degradation in the Little Karoo, South Africa
… status of the Little Karoo within four classes (Critically Endangered, Endangered, Vulnerable and Least Threatened). Conservation targets were modified according to the number of species and degree of endemism within each vegetation unit. Finally, using long-term climate and agricultural census …
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