Influences of marine subsidies on coastal mammal ecology

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dc.contributor.author Davidson, Katie
dc.date.accessioned 2018-02-01T15:34:27Z
dc.date.available 2018-02-01T15:34:27Z
dc.date.copyright 2017 en_US
dc.date.issued 2018-02-01
dc.identifier.uri https://dspace.library.uvic.ca//handle/1828/9030
dc.description.abstract The marine ecosystem provides key resources to terrestrial organisms inhabiting oceanic islands. These subsidies of marine resources have the potential to affect species richness, ecology and productivity, especially on islands with high perimeter-area ratios. I investigated the impact and importance of marine subsidies on mammal diversity and diet on islands of British Columbia’s Central Coast. Insular mammal species richness was significantly correlated with island area and quantity of marine subsidy (wrack). However, mink and river otter island occupancy was unaffected by island-level covariates, whereas small mammals were more likely to occupancy islands closer together. Keen’s mice and food items were subsidized directly (i.e., consumption) and indirectly (i.e., fertilization) by marine resources. Beach-dwelling arthropods composed 33% of mouse diets. Furthermore, mouse and terrestrial arthropod abundances and stable isotope signatures (d13C and d15N) of food items were depleted moving inland from the beach. Finally, reproductive male mice consumed up to twice the marine-derived prey as females. Collectively, this work demonstrates that insular mammalian richness, as mediated by island-level factors, may be complex due to variation within populations and the recipient ecosystem (e.g., prey biomass). en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Mammals en_US
dc.subject Marine subsidy en_US
dc.subject Peromyscus keeni en_US
dc.subject Ecology en_US
dc.subject Island biogeography theory en_US
dc.subject Stable isotopes en_US
dc.subject Central Coast en_US
dc.title Influences of marine subsidies on coastal mammal ecology en_US
dc.type Thesis en_US
dc.contributor.supervisor Darimont, Chris T.
dc.degree.department Department of Geography en_US
dc.degree.level Master of Science M.Sc. en_US
dc.description.scholarlevel Graduate en_US

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