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 324 for “"biogeography"”.
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Biodiversity and Biogeography of Amphipod Crustaceans
… aspects of the taxonomy, biodiversity, and biogeography of amphipod crustaceans and is an attempt to address the significant knowledge gaps in the absence of global assessments of the diversity and biogeography of amphipods and put a regional-scale study in Indonesia into a global context. …
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Biogeography and phylogenetics of grassland auchenorrhyncha
… surface, yet we know little about the historical biogeography of grassland-restricted lineages. Previous work on the biogeography of grassland taxa has largely focused on large mammals. While these studies have generated some general patterns for the origin and dispersal of grassland animals, …
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Biogeography and ecology of African waterbirds
Patterns of distribution and diversity for African waterbirds are investigated at the continental, sub-continental, ecosystem and species levels. The focal species is the Great White Pelican Pelecanus onocrotalus, one of South Africa's 'Red Data' bird species. The 'focal' ecosystem is Rondevlei …
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The biogeography of Striated Caracaras Phalcoboenus australis
This thesis defines and offers explanations for the distribution, range, and behavior of Striated Caracaras, coastal raptors of far southern South America. Like other caracara species, Striated Caracaras are relatively social, nest in dense aggregations where food is abundant, and feed largely by …
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Phylogenetics and biogeography of Australian subterranean Parabathynellidae.
The putatively ancient subterranean crustacean family Parabathynellidae has been poorly studied, in part because of the problem of obtaining material from difficult to access subterranean habitats in which they live. Further, the systematics of the group has been complicated by their generally …
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Systematics and Biogeography of South American Tripsacum
Distribution patterns of the New World Andropogoneae genus Tripsacum (Gramineae) were studied in an effort to trace its origin and evolution. The genus is widely distributed from about 42(DEGREES)N to 24(DEGREES)S latitude in the Americas and islands of the Caribbean. The largest concentration of …
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Systematics and biogeography of leafhoppers in Madagascar
… an opportunity to examine the phylogeny and biogeography of Malagasy leafhoppers in much greater detail than ever before possible. Specimens of three leafhopper subfamilies, Iassinae, Idiocerinae, and Cicadellinae were selected for study based on their independent evolutionary origins, …
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Biogeography and phylogenetics of Hawaiian bark lice
In a redefinition of the genus Ptycta (Psocidae), the history of the genera Ptycta Enderlein, 1925, and Copostigma Enderlein, 1903, is assessed. Previously defined as a monophyletic complex based on male genital morphology, Ptycta is redefined as those species of the Ptycta-Copostigma complex with …
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Biogeography and conservation of terrestrial afrotropical birds
… Differences can probably be attributed to island biogeography and aerography theory.
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Phylogeny and biogeography of the toxic dinoflagellate Alexandrium
… thesis explores the phylogeny, taxonomy, and biogeography of Alexandrium in light of this recent expansion. Alexandrium phylogeny was reconstructed through rDNA sequence analysis and compared to traditional morphological taxonomy. Alexandrium split into two groups, termed the α and ß clades. …
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Climate Change and Biogeography In the Marine Intertidal
… as a model system for the effects of climate on biogeography. Organisms residing here are exposed to a suite of stressful abiotic factors, are exposed to both water and aerial conditions, and extreme temperatures may be experienced. Sessile marine invertebrates, such as mussels and barnacles, are …
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In situ Metabolism and Biogeography of Phototrophic Consortia
… green sulfur bacterial epibionts. Diversity and biogeography of phototrophic consortia Motile phototrophic consortia are highly regular associations in which numerous cells of green sulfur bacteria surround a flagellated colorless b-proteobacterium in the center. To date, seven different …
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Faunal and human biogeography during the Terminal Pleistocene.
The evocative megafauna of the mammoth steppe, such as woolly mammoths and woolly rhinos, are part of a complex and changing faunal and environmental system. The dynamic processes leading to faunal change (including extinction) are currently not fully understood. In order to unravel these …
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Taxonomy, phylogeny and biogeography of cisticolas (Cisticola spp.)
A review of the genus Cisticola was published in 1930 by Rear-admiral Lynes. While subsequent authors have modified Lynes' original groupings, his work remains the basis for modern syntheses of cisticolas. This study tests Lynes' hypotheses by analysing data that he presented in his review and with …
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The historical biogeography of terrestrial gamebirds (Aves: Galliformes)
Whilst the phylogenetic relations of gamebirds are now well understood, there is a great lack of consensus on their biogeographical relationships. It has been suggested that the basal galliform clades, namely the megapodes from Australasia and the cracids from South and Central America, have their …
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Status, Distribution and Biogeography of the Birds of Paraguay
<p>The Paraguay River divides the Republic of Paraguay into two distinct regions: the Chaco to the west and the Orient to the east. The relatively flat Chaco is characterized by thorn scrub forests in the west, sub humid forests in the northeast and palm savannas in the southeast. The …
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Ecological influences in the biogeography of the Austral sedges
The biogeographic history of a species is a result of both stochastic processes such as dispersal and habitat filters that determine where a population with a given set of biological requirements can become established. In this dissertation, I examine the geographical and ecological distribution of …
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Taxonomy, systematics and biogeography of South African Cirripedia (Thoracica)
The South African Cirripedia (Thoracica) are reviewed for the first time in 88 years, since that of Barnard (1924). Data collection consisted of records from the South African Museum, previously published literature, and specimens collected in the field. The current state of knowledge of the taxon …
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The phylogeny, morphological evolution and biogeography of the Gaultherieae (Ericaceae).
The tribe Gaultherieae (Ericaceae: subfamily Vaccinioideae) comprises Chamaedaphne Moench, Diplycosia Blume, Eubotrys Nutt., Eubotryoides (Nakai) Hara, Gaultheria Kalm ex L., Leucothoë D. Don, and Tepuia Camp., with a total of approximately 250 species. The tribe is defined by its four-appendaged …
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Systematics and Biogeography of the Didymopanax group of Schefflera (Araliaceae)
Schefflera is the largest genus in the angiosperm family Araliaceae, with about 900 species, of which c. 300 belong to five subgeneric groups in the Neotropical region. Previous phylogenetic studies of Schefflera have been limited to a small number of species from this region, and very little is …
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