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 11 of 11 for “"host shift"”.
-
Characterizing the early stages of a novel host shift using host fitness and metabolomics
… contribute to successful colonization of a novel host species by a pathogen remain unclear. One likely factor determining host shift success is the early interaction between host and pathogen at the very moment of the host shift event. How does a novel host respond to a pathogen insult immediately …
-
Virulence of Drosophila C virus increased after a host shift and serial passage in Drosophila hosts
<p>The outcomes of novel host-pathogen interactions are unpredictable but can result in epidemics or pandemics. Exploring the initial encounter between a pathogen and a novel host species can elucidate why some pathogens successfully infect and adapt on a novel host when others fail. Much of our …
-
Changes in Gene Expression and Viral Titer in Varroa Jacobsoni Mites After a Host Shift Asian to European Honey Bees
… can allow microorganisms to enter and weaken the host, and mites themselves are vectors for viruses and perhaps other bee pathogens. There are a number of studies that also suggest that the primary cause of colony mortality is the viruses associated with the mites. Until recently, <em>Varroa …
-
Effects of anthropogenic change on interactions between North American tephritid flies and their biotic associates
… heat effect), novel agricultural host plants, and land/weed management. R. pomonella is native to portions of North America and historically utilized hawthorn (Crataegus spp. (L.) fruits as its host. After the introduction of apples, a fruit larger than hawthorn berries, to North …
-
Preference and performance of the Wild Indigo Duskywing (<i>Erynnis baptisiae</i>) on its native host Yellow Wild Indigo (<i>Baptisia tinctoria</i>) and on the introduced plant Crown Vetch (<i>Securigera varia</i>)
… Duskywing butterfly (<em>Erynnis baptisiae</em>) shifted from its native host plant Yellow Wild Indigo (<em>Baptisia tinctoria</em>) to the introduced plant Crown Vetch (<em>Securigera varia</em>). This study examined the effects of this host shift by comparing butterfly preference (larval feeding …
-
Coevolution of Heliconius spp. and Passiflora spp. : a phylogenetic comparison
… EF-1a gene regions. For the Passifloraceae, 17 host plant species were utilized to establish a phylogeny based on tRNALeucine and ITS 1/5.8S1 ITS 2 sequence data. The phylogenies for both groups were largely in agreement with current classification (for Passifloraceae) and previously established …
-
Understanding the Evolution of Emerging Bacterial Pathogens in Response to Host Resistance
Understanding the evolution of parasites and hosts following a host-shit event is increasingly recognised as being of great importance to public health and the clinical/veterinary sciences in predicting the behaviour and evolutionary consequences of emerging infectious diseases. Microbial …
-
The study of ancient viral class II envelope fusion proteins within the viral retroelements of Nematoda and the nuclear plasmids of Dictyostelium
… (i.e. viruses, plasmids, and transposons) in host genomic evolution, horizontal gene transfer, and virus evolution. The work presented in this thesis highlights the role viral fusion proteins and their homologues in biological development and the evolution of sex. It demonstrates the potential …
-
Discovering Viral Hosts, Mutations, and Diseases using Machine Learning
… raises three important questions, namely, which host(s) can the virus infect, what mutations in the virus could affect its interaction with its hosts and enable a host-shift, and which diseases can the virus cause in humans. We propose novel machine learning (ML)-based solutions to these three …
-
Ecology and Molecular Phylogenetics of <i>Hydnora</i> (Hydnoraceae) in Southern Africa
… biology, germination ecology, parasite-host nutritional relationships, and the molecular systematics of this group. Experimental addition of the primary pollinator, <em>Dermestes maculatus</em> to <em>Hydnora africana</em> chamber flowers demonstrated beetle imprisonment during the …
-
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 …