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 115 for “"endemism"”.
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Avian Diversification in the Andes: Understanding Endemism Patterns and Historical Biogeography
The Andes, along with the Amazon and Atlantic forests, harbor the richest avifauna in the world with roughly one third of all the world's species of birds. Many biogeographical studies have sought to explain the origin and diversification of Andean taxa. However, because of the Andes' extensive …
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Phytogeography, endemism and diversity of the fynbos of the southern Langeberg
… investigation of aspects of phytogeography, endemism and species diversity in the rich fynbos flora of the southern Lange berg, Cape, South Africa. The basis was a survey of the fynbos vegetation of the southern Langeberg carried out following the Braun-Blanquet or Zurich-Montpellier …
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Flora of the Cape Peninsula : endemism, threatened plants and conservation in perspective
… and 141 are threatened. The Bykov's level of endemism at 1 for the Peninsula was high in global terms. Endemic and threatened taxa were found not to be a random assemblage taxonomically, with and Proteaceae overrepresented in terms of endemics. The aforementioned families Restionaceae and …
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Patterns and Disturbance-Induced Drivers of Plant Diversity and Endemism on High Elevation Islands
… understanding of the drivers of plant diversity, endemism and speciation by using empirical, experimental and theoretical approaches. I introduce and define the concept of high elevation islands (HEI), which – in my opinion – are ideal research objects to address ecological and biogeographic …
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Is aquatic invertebrate endemism in the Western Cape region of South Africa related to the fynbos blackwaters?
… It has been argued that the high degree of endemism is related to the origin of the fauna, the multiplicity of habitats present and the harsh water chemistry characterized by low pH. The aim of this project was to look at the relationship between pH and endemism. Specifically I asked if …
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Endemism and richness in the Cape floristic region: phytogeographic patterns and environmental correlates in a global biodiversity hotspot
… each other using several different datasets. Endemism and species richness in the core CFR were assessed against contemporary environmental conditions, using a spatially sensitive regression technique. A combined dataset of 4414 taxa was analysed, of which 4000 were recorded in the general CFR …
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Remotely operated vehicle exploring ichthyofauna association with habitat from shore-shelf, in an endemism hotspot in South Africa
… The area offshore of the Kei river mouth is an endemism hotspot, and a transitional zone between the Subtropical East Coast and the Warm Temperate South Coast. The region waslargely unexplored because of itstreacherous sea conditions and because it was no longer an area of commercial fishing …
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Peixes recifais brasileiros: diversidade e endemismo
Leveis of diversity and endemism of the ichthyofauna that inhabits Brazilian shallow reefs are established. Related ecological and historical factors are presented and discussed. Diversity is estimated based on a criticai review of recent contributions to the taxonomy of Brazilian reef fishes. …
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Elucidating cryptic diversity in East African frogs : the case of Arthroleptis francei Loveridge, 1953
… the A. francei complex to estimate the weighted endemism, phylogenetic endemism, phylogenetic diversity and species richness. Endemism was mainly average whilst species richness was high in seven hotspots. The newly acquired information contributes to a better understanding of the diversity …
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Historical biogeography of rhacophorid frogs of Japan and the Ryukyu Archipelago inferred from a phylogenetic perspective
… were examined from five hypothesized areas of endemism which compose Japan, the Ryukyu Archipelago, and Taiwan, and phylogenetically related or geographically proximate taxa from the Asian continent. From these specimens, phylogenetic hypotheses have been constructed using 355 characters …
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Potential Downstream Immunological Effects of Evolved Disease Tolerance in House Finches
… of house finches with longer histories of MG endemism have evolved tolerance and resistance to MG, and this evolution is associated with several immunological differences including reductions in pro-inflammatory immune responses. However, it remains unknown whether these immunological changes …
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Phylogeography of the Malagasy Ant Species Otontomachus coquereli
… geographically complex area boasting levels of endemism that blatantly raise questions about their origins. There is evidence that these endemics arose via insitu diversification during Madagascar's ~88 million year isolation, even though it was essentially in the middle of Gondwana with ample …
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The functional, ecological and evolutionary significance of culm structures in the Cape Floristic Region
… and is known for its high species richness and endemism. This Mediterranean-type climate region receives winter rainfall that averages between 250 and 650 mm annually over most of the region but reaches an average of more than 1000 mm in the mountains of the southwest and southern Cape.
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Tetraria triangularis (Boeck.) C.B. Clarke and the Cape fold archipelago : an analysis of genetic and morphological variation in a high-altitude species native to the moutains of the Cape floristic region
… high plant species richness and high floristic endemism (Marloth 1929, Takahatjan, 1986, Goldblatt and Manning 2000, Linder 2003). A small number of clades (33) account for 50% of the species diversity, indicating that much of the diversification has occurred in situ, rendering it reminiscent of …
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The acclimation ability of the shale barren endemic Eriogonum alleni to light and heat
… barren habitat. One reason proposed fc)r their endemism is that the plants are obligate heliophytes (Keener, 1983). The purpose of this dissertation is tel examine the acclimation ability of the shale barren endemic Eriogonum alIeni to shade and high temperature.
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Biodiversity And Evolution In The Guiana Shield, South America
… for supporting high species diversity and endemism. I recover core areas throughout the Guiana shield which have been most important amphibians and warrant conservation efforts to safeguard them for the future. Broadly, this work shows that species richness of neotropical amphibians still …
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Evolutionary patterns in Thamnochortus (Restionaceae) : a study of specification in the Cape floristic region
… areas which were considered to be areas of endemism. A concentric ring method recognised narrow areas of endemism and illustrated the overlap of species distributions between areas. The defined areas of endemism and similarity were used in general area cladograms to determine area …
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The Vascular Flora of Greater San Quintín, Baja California, Mexico
… to a diverse flora with high levels of local endemism and many rare plants. The flora documented in this study was compared to historical records from the region and shows the impact of agriculture and urbanization on the plants, including several extirpated species. A study of the perennial …
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Systematic revision of the South American armored catfish genus Loricaria (Siluriformes: Loricariidae)
… Distributions of Loricaria exhibit patterns of endemism similar to those documented for other groups of Neotropical fishes. Species diversity is highest in the Amazon basin (13 species, including 10 endemics), followed by the Paraguay region (5 species, including 4 endemics), Guianas region (5 …
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Diversity of geometrid moths in a montane rainforest in Ecuador
… host-plant relationships, community structure, endemism, alpha-, beta-, and gamma-diversity. The role of different environmental factors as mechanisms for the diversity of the moths is discussed. Furthermore, methodological aspects of light-trap sampling, and selection of appropriate diversity …
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