Arctic health: Investigating the gut microbiota and parasite diversity of Arctic species
The Arctic faces some of the most rapid and extreme climatic changes on earth, and within forthcoming years these changes are expected only to accelerate. The evolution of Arctic species has been shaped by a turbulent climatic history encompassing multiple cycles of glacial advance and retreat, and...
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| Format: | Thesis |
| Language: | English |
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2020
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| Online Access: | https://orca.cardiff.ac.uk/id/eprint/139749/ https://orca.cardiff.ac.uk/id/eprint/139749/2/PhD_Thesis_Sophie_Watson_FINAL_Accepted_changes.docx.pdf https://orca.cardiff.ac.uk/id/eprint/139749/1/Electronic_Theses_and_Dissertations_Publication_Form_Complete.pdf |
| Summary: | The Arctic faces some of the most rapid and extreme climatic changes on earth, and within forthcoming years these changes are expected only to accelerate. The evolution of Arctic species has been shaped by a turbulent climatic history encompassing multiple cycles of glacial advance and retreat, and associated changes in sea-ice extent. As such, many Arctic species are well adapted to climatic extremes, but remain poorly adapted to secondary ecological stressors such as competition, contaminants, parasites and disease, leaving them vulnerable. Despite this, there remains a paucity of data addressing two major influencers of health, i) the composition of host gut microbiota and ii) parasitic infection. Here, these shortcomings are addressed using a whole-Arctic approach and two model apex species; the polar bear (Ursus maritimus) and the wolverine (Gulo gulo). Within this thesis, a combination of data mining, high-throughput sequencing, and traditional parasite count approaches are used to i) establish the parasite diversity and data deficient species across the whole Arctic, and ii) to determine the gut bacterial communities and parasite diversity of polar bears and wolverines in association with contaminant profiles, changes in land use and diet. Firstly, this thesis shows that humans and domestic dogs are hubs for parasites within the Arctic, while other species (even those which are ambassadors of the Arctic, e.g. polar bears) remain poorly studied. Secondly, this thesis is the first to conduct a full assessment of the gastrointestinal parasite diversity of Arctic wolverines, finding that the distribution of their predominant helminth infection, Baylisascaris devosi, although limited by latitude, is present in individuals from the Arctic tundra, which was previously unrecorded. Furthermore, we describe how the composition of bacterial communities within the gut of wolverines may reflect their ability to scavenge a wide variety of prey and tissue types. In polar bears, we show that the gut microbiota differs ... |
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