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 110 for “"endemic species"”.
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Conservation of endemic species in China
… in the world, harboring more than 10% of the species in the world. Among them, 11% of the vertebrate genera and 7% plant genera are endemic to China. During its rapid social and economic development, increasing habitat loss and fragmentation have occurred. However, it wakes up to the threats …
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Germination niche of Sardinian endemic species in mountain riparian deciduous forests
… persicifolia. Rare and threatened Sardinian endemic species such as Ribes multiflorum subsp. sandalioticum, Aquilegia barbaricina, Rhamnus persicifolia and Paeonia corsica grow under and close to the canopy of such riparian woods. Temperature is considered one of the major environmental …
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Self-incompatibility in Cosmos atrosanauineus: a rare Mexican endemic species of Asteraceae
… centres on Cosmos atrosanguineus, a rare Mexican endemic self-incompatible species of Asteraceae that is now believed to be extinct in the wild. The two known wild C. atrosanguineus collections, made in made in the 19th century, localise the species to the pine-oak mountain forest ecological …
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Demographic and environmental determinants of reproductive success in Synthyris bullii, a rare endemic species
… ecology of Synthyris bullii, a rare perennial species endemic to North American prairies and savannas. In Chapter 1, I explore the relationship between reproductive success and floral quantity versus quality. The results of this study show that inflorescence size correlates positively with …
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Vegetation and flora of the Southern Drakensberg escarpment and adjacent areas
… trampling and invasion by exotic plant species impact negatively on the native vegetation. A brief review of the history and previous botanical exploration of the area, as well as the physical environment are given. Four main plant communities -- the Maytenus undata -Rhus dentata …
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Speciation and phylogeography: coalescent-based models applied to the Cape plant genus Pauridia
… in a profusion geographically restricted endemic species within a The CFR is a rich and dynamic for the molecular study of speciation, but until recently studies have focused on factors influencing diversification of whole lineages, than on details the speciation process within and between …
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Speciation and phylogeography: coalescent-based models applied to the Cape plant genus Pauridia
… in a profusion geographically restricted endemic species within a The CFR is a rich and dynamic for the molecular study of speciation, but until recently studies have focused on factors influencing diversification of whole lineages, than on details the speciation process within and between …
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The vegetation and restoration potential of the arid coastal belt between Port Nolloth and Alexander Bay, Namaqualand, South Africa
… to plant growth form and habitat. 300 plant species were collected in the study area representing 40 families, with 28 being endemic to the coastal region. The flora is dominated by the Asteraceae (53 species), Mesembryanthemaceae (47), Crassulaceae (28), Poaceae (17) and Aizoaceae (15). …
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Life History Observations and Determination of Potential Host Fish Species for Chipola Slabshell, Elliptio chipolaensis
<p>North America is home to nearly 300 species of freshwater mussels with approximately 80% being found in the southeastern United States. The Federally threatened species, Elliptio chipolaensis (Chipola slabshell), is considered an endemic species to the Chipola River Basin in the Florida …
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Phytogeography, endemism and diversity of the fynbos of the southern Langeberg
… 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 approach. Forty-six …
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Η ΑΥΤΟΟΙΚΟΛΟΓΙΑ ΤΟΥ ΕΝΔΗΜΙΚΟΥ ΕΙΔΟΥΣ ALOSA (CASPIALOSA) MACEDONICA (VINCIGUERRA), (PISCES: CLUPEIDAE), ΤΗΣ ΛΙΜΝΗΣ ΒΟΛΒΗΣ
… IS GIVEN THE EXPLANATION OF THE PRESENCE OF THE ENDEMIC SPECIES. ALOSA MACEDONICA IN LAKE VOLVI. THE SECOND PART CONSTITUTES THE MAIN SUBJECT OF THE WORK WHICH CONTAINS THE STUDY OF THE AGE, GROWTH AND COMPOSITION OF THE SPECIES POPULATION. THETHIRD PART IS REFERRING TO THE FISHERY OF THE …
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Population genetics of the Cape serotine bat (Neoromicia capensis) in South Africa
… bat (Chiroptera: Vespertilionidae) is an endemic species of sub-Saharan Africa and occupies all biomes throughout its distribution. It roosts in anthropogenic structures in small colonies of up to ten individuals. Since its discovery in the early 1800's by Arthur Smith little more than a …
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Morphometric, Isozyme and Random Amplified Polymorphic DNA (RAPD) : Analysis of SAROTHERODON MOSSAMBICUS Populations in Java, Indonesia
… Indonesians, is a strong competitor with some endemic species and .readily hybridizes with other tilapias. A base line assessment of the present genetic diversity of these populations in Indonesia was conducted to facilitate the management of this species. This study compared the effectiveness …
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Systematics, Biogeography and Leaf Anatomy and Architecture of Bursera subgen. Bursera (Burseraceae) in the Greater Antilles and the Bahamas
… the origin and evolutionary relationships of the species of <em>Bursera</em> in Cuba, Hispaniola, Jamaica and the Bahamas. The goals of the first chapter were to test monophyly of the group, revisit a recent transfer of two species of <em>Bursera</em> to <em>Commiphora</em>, and place recently …
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An assessment of the distribution and conservation status of endemic and near endemic plant species in Maputaland
… Mozambique, holds more than 2,500 native plant species. Of those, over 203 are endemic or near endemic to this area. However, the current high human population density in MCE, coupled with high population growth, has increased the pressure on the natural resources of the region and threatens the …
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Phylogenetic Relationships within Coleeae (Bignoniaceae Juss.)
… is represented by tribes Coleeae (4 genera/58 species) and Tecomeae (4 genera/15 species). Species of Coleeae occur in assemblages of sympatric, locally endemic species. The purpose of this study was to explore the phylogenetic relationships within Coleeae. In order to do so, techniques such as …
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Bird use of avocado farms and intact forest in the Dominican Republic
… point-count bird surveys to determine how avian species richness and diversity differ between avocado farms and intact forest, as well as how vegetation differences between farms and forests could impact bird use. We found that vegetation structure varied significantly between farm and forest …
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The vascular flora of the Lula Lake land trust on Lookout Mountain in Walker County, Georgia and a biogeographical analysis of the Coastal Plain element on the Cumberland Plateau
… total of 60 collecting trips were made with 672 species and lesser taxa documented. Twenty-eight rare species of conservation concern were documented including the federally endangered Spiraea virginiana and four species previously unknown from the state (Calamovilfa arcuata, Chelone lyonii, …
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Decline of the Savannah River Redeye Bass (Micropterus Coosae) Due to Introgressive Hybridization With Invasive Alabama Spotted Bass (Micropterus Punctulatus Henshalli)
… lead to the extirpation or extinction of native species through a myriad of different biological mechanisms. Introgressive hybridization is one mechanism that is often overlooked due to difficulty of examination without the use of molecular techniques. However, hybridization can be just as …
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ΒΙΟΜΕΤΡΙΚΗ ΚΑΙ ΚΥΤΤΑΡΟΛΟΓΙΚΗ ΜΕΛΕΤΗ ΤΟΥ ΓΕΝΟΥΣ FRITILLARIA L. ΣΤΗΝ ΕΛΛΑΔΑ
… RESULTS OF A BIOMETRICAL AND CYTOLOGICAL WORK 17 SPECIES OF THE GENUS FRITILLARIA ( LILIACEAE) IN GREECE. MULTIVARIATE TECHNIQUES, SUCH AS PRINCIPAL COMPONENT ANALYSIS AND CLUSTER ANALYSIS WERE USED TO EVALUATE THE PHENETIC SIMILARITIES AMONG THE SPECIES. (40 POPLUATION SAMPLES BY USING 22 …
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