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 35 for “"Taxonomic Diversity"”.
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Estimating Taxonomic Diversity Using Centrum Growth Profiles and Stinger Morphology of 36 Million Year Old Stingrays From North Dakota
… years ago.</p> <p>Our goal was to estimate alpha diversity of stingrays from a fluvial fossil deposit that existed 34 million years ago. We predicted the fossil stingrays from North Dakota to grow very slow compared to their modern counterparts. Fossil elements of stingrays are represented by …
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A functional and trait-based approach in understanding ant community assembly in the Soutpansberg Mountains, South Africa
The concept of taxonomic diversity has been widely used to investigate diversity patterns and the mechanism underlying community assembly. However, functional and trait diversity can further explain the factors driving community assembly because they capture different aspects of species ecological …
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Intestinal parasites in the Roman Empire, their regional distribution and ecosocial determinants
… to consider possible explanations for parasite taxonomic diversity in the empire. Archaeological sediments were collected from Roman period sites in previously understudied regions, such as Italy, Turkey, and the frontier regions, as well as pre-Roman and post-Roman time periods that had limited …
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Shotgun metagenomic approach to the influence of industrialization and social behavior on fecal microbiomes
… industrialization that highlights a decrease in taxonomic diversity with increasing industrialization. We also find evidence to support the hypothesis of functional redundancy, showing that across populations, similar functional and metabolic pathways can exist across this taxonomic diversity. …
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Fish landings, discards and benthic material from demersal trawling in the western English Channel (ICES VIIe)
… the relative contribution of selected groups to taxonomic diversity showed the derived conservation priorities for 'orders' of fishes were Elasmobranches > Pleuronectiformes > Gadiformes. In general, the fact of 'losing' orders of fishes was more important for single rather than pair trawl …
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Biological and ecological studies of Hydrotaea aenescens (Wiedemann) (Diptera: Muscidae), and other arthropods of high-rise cage layer poultry houses
… for controlling house flies in poultry houses. Taxonomic diversity of arthropods in a new high-rise cage layer poultry house was determined from manure samples collected from different manure moisture categories. Stabilization of taxonomic diversity and taxonomic evenness of manure-inhabiting …
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Molecular Systematics of <i>Isoëtes</i> (Isoëtaceae) in Eastern North America
… Eastern North America accounts for 22% of global taxonomic diversity, containing 32 fertile taxa and 16 named hybrids. This taxonomic diversity is built upon relatively little morphological difference, and even combined with phylogenetic analysis using several nuclear and chloroplast DNA markers, …
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Do Butterflies Use "Hearing Aids"?Investigating the Structure and Function of Inflated Wing Veins in Nymphalidae
… vein on each forewing. However, the function and taxonomic diversity of these structures is unknown. This thesis comprises both experimental and comparative approaches to test hypotheses on the function and evolution of these inflated veins. A laser vibrometry study showed that ears in the common …
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Diversidade de Chiroptera do quaternário de Serra da Mesa (GO) com ênfase na morfologia do aparelho mastigatório
Evaluate the taxonomic diversity of fossil bats (Chiroptera) from the region of the Serra da Mesa in the State of Goias, Central Brazil. Quaternary fossils were obtained from four limestone caves, namely Igrejinha, Carneiro, Nossa Senhora Aparecida, and ltambé. The taxonomic identification of the …
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Inferring rare bumble bee species occurrences from nontarget bumble bee assemblages
… the local presence of B. affinis, focusing on taxonomic diversity (richness, abundance, composition), co-occurrence patterns, multispecies indicators, and B. affinis detection probability. Nontarget species richness, total abundance, and select species abundances were all significantly greater …
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Distribution, Abundance, and Trophic Ecology of Anguilliform Leptocephali in the Northern Gulf of Mexico
… as diet sources. Information about leptocephali taxonomic diversity, abundance, distribution, and trophic ecology add to our understanding of their ecological role in the ocean.</p>
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Bats and the city : urban bat biodiversity in a tropical biome transition zone
… to wildlife. Our understanding of urban biodiversity patterns and their driving factors in tropical cities which interact with high levels of biodiversity is limited, yet it is pivotal to developing efficient and effective conservation guidelines for urban planning. This study uses a …
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The Role of Zooplankton in Regulating Carbon Export and Phytoplankton Community Structure: Integrating Models and Observations
… supply and grazing in promoting phytoplankton diversity. Zooplankton switching plays a significant role in promoting diversity because it allows competing phytoplankton types to coexist in situations that would otherwise lead to competitive exclusion. When implemented in a size-structured NPZ …
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Decoding divergence in marine protistan communities: from strain diversity to basin biogeography
… of which dimensions of protistan genetic diversity translate to measurable phenotypic variation is needed to predict the impact of protists on marine biogeochemistry and protists’ environmental change sensitivity. I cultured twelve strains of the coccolithophore Gephyrocapsa huxleyi across …
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Looking into the Past: The Diversification of Amphibians in the Neotropical Savannas
… to resolve questions of evolutionary history, taxonomic diversity, species boundaries, and test hypotheses that implicate climatic (stable/unstable) and geomorphological events (plateau/valley) in the formation of this diversity. Results: The <em>C. albopuntata</em> species group is distributed …
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Taxonomic and Phylogenetic Diversity of Pitcher Plant Bogs in Georgia's Coastal Plain
<p>Diversity studies via floristic survey and taxonomic metrics have proven essential for discerning community composition and biodiversity, however, phylogenetic analyses are necessary to reveal underlying evolutionary change and potential community assembly patterns. Pitcher plant bogs are highly …
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Decoding divergence in marine protistan communities: from strain diversity to basin biogeography
… of which dimensions of protistan genetic diversity translate to measurable phenotypic variation is needed to predict the impact of protists on marine biogeochemistry and protists’ environmental change sensitivity. I cultured twelve strains of the coccolithophore Gephyrocapsa huxleyi across …
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Investigating Causal Relationships between Global Change and Insect Interaction Networks: Insights into Dietary Specialization, Interaction Diversity, and Disturbances
… global change, including dramatic losses of biodiversity. In this dissertation, I investigated causal relationships between global change and diversity of insect interaction networks through quantifying effects of biotic and abiotic gradients on dietary specialization, interaction diversity, and …
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Microbial community structure and nitrogen cycling in limestone biofilms
… varied. Metagenomic analysis confirmed that taxonomic diversity in biofilm communities is dynamic and variable, but the predicted functional capacities appear to be relatively stable throughout the sampling time. Less than one quarter of the variation in the taxonomic community data is …
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Recent foraminifera of Trinity Bay, Texas
… This environmental variation is reflected in the taxonomic composition, morphologic variation, and distribution of the Foraminifera. Two foraminiferal assemblages are recognized: 1) a bay assemblage characterized by low taxonomic diversity and the dominance of Ammotium and Ammonia; and 2) a …
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