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 15 of 15 for “"cryptic diversity"”.
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Hiding in plain sight: unveiling cryptic diversity and patterns in bumble bees
… wilmattae species group. The color pattern diversity within this group across a variety of habitats in Mexico and Central America has brought their taxonomic status into question for over 150 years. To resolve the uncertain species status of this group, I collected extensive genetic data …
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Elucidating cryptic diversity in East African frogs : the case of Arthroleptis francei Loveridge, 1953
Detailed information on the diversity of species and their distributions is crucial for the implementation of useful conservation measures. Here, I focus on the Afromontane region of Malawi and Mozambique, and use molecular techniques, environmental inferences and species delimitation methods to …
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The Phylogenetic Relationships Among Extant Catfishes, With Special Reference to Ictaluridae (Otophysi: Siluriformes)
Cytochrome b suggested cryptic diversity within several species of Noturus. Relationships among members of the subgenus Rabida were resolved and in many cases well supported. Relationships among Schilbeodes were poorly resolved. A calibrated substitution rate identified a period between 8 and 2 …
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Genetic And Morphological Assessment Of Pigtoe Mussels (unionidae: Pleurobemini: Fusconaia/pleurobema Spp.) in Ozark Drainages
… Specifically, Fusconaia has been shown to harbor cryptic diversity within drainages of the Ozarks. Further, Pleurobema rubrum and P. sintoxia have been shown to be possible conspecifics despite have differing shell morphologies. This study sought to use the COI mitochondrial gene to investigate …
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The biotic effects of tertiary geoclimatic change in the southern hemisphere
… I discovered high levels of unexpected cryptic diversity within an African endemic lineage of frogs that is linked to specific, local processes (habitat fragmentation and climatic stability). In contrast, I find little evidence to continue recognizing elevated diversity within a lineage …
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Investigating virus-host interactions in a changing Arctic Ocean
… Basic knowledge of the spatial variability and diversity of surface AO microbial eukaryotes, however, is limited. M. polaris is known to occur in a variety of different environments in the AO, yet its molecular diversity and mechanisms underlying its ecological success are not well understood. …
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Biodiversity And Evolution In The Guiana Shield, South America
… Unfortunately, the region's unparalleled biodiversity has not protected it from ongoing threats such as agriculture, mining, logging, oil extraction, and climate change. I studied the biodiversity and evolution of the herpetofauna of South America in order to investigate the influence of …
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Field and laboratory evaluation of the interactions between pesticides and the gut microbiome in Honey Bees (Apis mellifera)
… Washington revealed that gut microbiome beta diversity and community evenness was significantly correlated with the concentration of imidacloprid (ng/g) detected in bees, but not with the other tested pesticides (Tau-fluvalinate, Cypermethrin). Thus, imidacloprid was the focus of laboratory …
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Eukaryotic Parasites of Toxic and Bloom-forming Diatoms: Molecular insights in their diversity and physiology
… health, climate and biogeochemical cycles; their diversity is still widely underinvestigated. This statement is particularly truthful in the case of heterotrophic protists, more difficult to establish as clonal cultures in lab conditions than their phototroph counterpart. Only with the recent …
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Population genomics and domestication of the Black Soldier Fly (Hermetia illucens L.)
… knowledge of the evolutionary history, genetic diversity and potential for genetic improvement of this species will be fundamental to the success of this important industry. I investigate the role of domestication and its impact on the genome of *H. illucens*. I developed a suite of high-quality …
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Population genetic structures and dispersal patterns of arthropods in New Zealand and the Ross Dependency, Antarctica
… and New Zealand. I conclude that such levels of cryptic diversity indicate the inadequacies of morphology-based classification schemes. Accordingly, assessments based on genetic diversity (e.g. mtDNA analyses) are required.
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Diversity, Distribution and Evolution of the Planktonic Diatom Family Chaetocerotaceae
… is often challenging because of the existence of cryptic species and intraspecific phenotypic plasticity. Proper characterization requires isolation of cells, growing them into monoclonal cultures, and characterizing the cultures genetically and morphologically. However, not all species grow in …
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Using a multi-dimensional approach to determine the conservation and taxonomic statuses of two rare crayfishes in northern Arkansas
… For C. hubbsi we searched for potential cryptic diversity by analyzing both genetic and morphological characteristics. We sequenced two mitochondrial gene regions from individuals across its range and conducted Bayesian and maximum parsimony analyses on these data. Additionally, we …
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The colonisation of canola crops by the diamondback moth, Plutella xylostella L., in southern Australia
… carry insecticide-resistant genotypes or when cryptic diversity creates uncertainty around species identity. The diamondback moth, Plutella xylostella L., the most destructive pest of Brassica crops worldwide, seasonally colonises winter canola crops in southern Australia leading to …
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Systematics and Species Delimitation in New Guinea Skink Species Complexes (Squamata: Scincidae)
… I additionally find evidence for several cryptic species in the group, including deep, species-level divergence among the populations of C. storri from Australia, the Aru Islands, and New Guinea, despite their recent connectivity via Sahul Shelf emergence during Pleistocene glaciations. …