Aquatic insects as an energetic subsidy to riparian consumers in the Olman River Basin, Alberta

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dc.contributor.authorBecker, Allison L.
dc.contributor.supervisorRasmussen, Joseph B.
dc.contributor.supervisorHurly, T. Andrew
dc.date.accessioned2013-11-29T22:18:05Z
dc.date.available2013-11-29T22:18:05Z
dc.date.issued2012
dc.descriptionxii, 126 leaves m ; 29 cmen_US
dc.description.abstractFreshwater and terrestrial ecosystems are connected through biomass exchanges such as the flow of predators, prey, nutrients and detritus between them. Emerging aquatic insects provide an alternate food source to riparian consumers often termed an allochthonous subsidy. Stable isotope analyses of naturally occurring carbon and nitrogen is effective for tracing energetic food sources to consumers. This thesis evaluated whether stable isotope analysis would be effective in the Oldman River Basin, Alberta. Aquatic and riparian primary consumers are distinct in their isotopic signatures and valid for to use in stable isotope analysis. Stable isotope modelling was then used to evaluate the proportional contribution of aquatic insects to riparian spider and beetle diets. Carbon analysis showed an overall aquatic insect contribution of 25 % and 18 % for spiders and beetles, respectively; while nitrogen analysis showed an overall contribution of 36 % and 20 %, respectively. The spatial extent of the aquatic insect contribution upland from the river was shown to decrease from 50 - 55 % at 1 m to 0 % at 30 m for both consumers using carbon, and from 35 - 40 % at 1 m to 0 % at 40 m using nitrogen. Finally, regression modelling of the size of a river and the spatial scale of an aquatic insect dietary contribution showed a significant relationship, indicating larger water bodies support higher production of aquatic insects. A meta-analysis of published literature applied to this model also indicated a significant relationship between the size of the river and the extent of an aquatic insect contribution.en_US
dc.identifier.urihttps://hdl.handle.net/10133/3315
dc.language.isoen_CAen_US
dc.publisherLethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences, c2012en_US
dc.publisher.departmentDepartment of Biological Sciencesen_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectAquatic insects -- Alberta -- Oldman River Basinen_US
dc.subjectFood chains (Ecology) -- Alberta -- Oldman River Basinen_US
dc.subjectRiparian ecology -- Alberta -- Oldman River Basinen_US
dc.subjectOldman River Basin (Alta.)en_US
dc.subjectDissertations, Academicen_US
dc.titleAquatic insects as an energetic subsidy to riparian consumers in the Olman River Basin, Albertaen_US
dc.typeThesisen_US
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