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.
Results
Showing 1 to 13 of 13 for “"Host-switching"”.
-
Identification of reassortant influenza viruses at scale : algorithm and applications
… whether reassortment is associated with host switching events. In this thesis, I use phylogenetic heuristics to develop a new reassortment detection algorithm capable of finding reassortant viruses in tens of thousands viral isolates. Together with colleagues, we then use the algorithm to …
-
From Micro to Macro: Investigating mechanisms involved in the convergent evolution of feather lice ecomorphs
… Here, we explore the evolution of ecomorphs in a host-parasite system from a micro and macroevolutionary perspective. Parasitic feather lice in the family Philopteridae (Order: Psocodea) are found on almost all species of birds and have repeatedly diversified into ecomorphs specific to areas of …
-
Systematics and cophylogenetics of toucans and their associated chewing lice
Historically, comparisons of host and parasite phylogenies have concentrated on cospeciation. However, many of these comparisons have demonstrated that the phylogenies of hosts and parasites are seldom completely congruent, suggesting that phenomena other than cospeciation play an important role in …
-
Phylogeny and codivergence in the fig-fig wasp mutualism : sycoecine and agaondid fig wasps (Chalcidoidea, Hymenoptera) associated with Ficus section Galoglychia (Moraceae)
… has been distinguished by a one-to-one ratio of host-specificity, whereby each species of fig tree (Ficlls, Moraceae) is pollinated by a unique species of fig wasp (Agaonidae, Chalcidoidea, Hymenoptera). Recent studies conclude, however, that extreme host-specificity is no longer as ubiquitous as …
-
COMPARATIVE BIOGEOGRAPHY OF NORTH AMERICAN PIKA PARASITES: UNRAVELING A HISTORY DRIVEN BY CLIMATE CHANGE
… ecosystem dynamics and climate change as well as host biogeographic history. I performed a comparative biogeographic study on two endoparasitic helminth lineages associated with pikas (<em>Ochotona</em>) -the tapeworm genus <em>Schizorchis</em> and the pinworm subgenus <em>Labiostomum …
-
BERINGIAN BIOGEOGRAPHY: PATTERNS OF INTERCONTINENTAL DISPERSAL AND THE STRUCTURING OF A HOLARCTIC TAPEWORM GENUS
… <em>Microtus, Myodes, </em>and <em>Lemmus </em>hosts. Comparing the <em>Arostrilepis </em>colonization history with the pattern of its host associations shows that host-switching is prevalent in its history particularly following the Nearctic colonization associated with <em>Microtus </em>voles. …
-
A phylogenetic study of the Cynipoidea (hymenoptera)
… for the phylogenetic reconstruction. Concepts of host defence, host range, gall complexity, gall position, host switching, reproductive cycles, biogeographical distribution, plate tectonics, palaeobotany, palaeoclimatology, the origin of hyperparasitism and the adaptive characters associated with …
-
The Role of Visual and Olfactory Cues in Host Recognition for the Specialist Bee Genus Diadasia, and Implications for the Evolution of Host Choice
How specialist bees distinguish their host plants from co-blooming non-hosts is not well understood, but it is thought that they may be physiologically limited in their ability to recognize the majority of visual and olfactory cues presented by flowering plants. Species in the genus Diadasia …
-
Protein Folding, Host Cell Proteostasis, and Viral Evolution
… virtually all RNA viruses rely on their host’s proteostasis network components for viral protein folding. It follows that the host’s proteostasis network could play a prominent role in defining the sequence space accessible to an evolving viral protein. In this thesis, I address how host …
-
Effects of temperature and pollinator availability on plant reproductive success in the Indiana spring ephemeral community
… change, the plants may switch pollinators (host switching), obtain services or resources from other sources (e.g., self-pollination), or face extinction. ^ The goal of this dissertation was to experimentally test the hypothesis that temperature-mediated variation in flowering time influences …
-
Patterns of association in a co-introduced insect herbivore and parasitoid wasp
… as evidenced by the prevalence of native species host switching to exotics, and vice-versa. For the remainder of my dissertation, I used molecular methods to determine the invasion routes of the herbivorous parsnip webworm (Depressaria pastinacella; Lepidoptera: Depressariidae), and its primary …
-
Predicting Multi-trophic Consequences of an Emerging Disease
… insect larvae that specialize on the impacted host species. The loss of pollinators whose larvae feed on impacted species and provide services for native plants may also be a serious but yet undocumented indirect threat of these exotic invasions. The disruption of mutualistic relationships …
-
A morphological phylogeny with a taxonomic revision of African species of Goniodes (Insecta: Phthiraptera: Ischnocera) sensu lato from the Galliformes (Aves)
… and evolutionary processes. Given their high host specificity, simple life cycle and distinctive molecular evolution, the approximately 5000 species of ectoparasitic lice in the order Phthiraptera are ideal models for such work. Unfortunately, study of this group is hindered by a history of …