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Winter vertebrate browsing of birch: effects on the use of leaf litter leachates by stream microorganisms

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dc.contributor.author Estensen, Jeffrey L.
dc.date.accessioned 2015-03-17T23:51:48Z
dc.date.available 2015-03-17T23:51:48Z
dc.date.issued 2001-05
dc.identifier.uri http://hdl.handle.net/11122/5138
dc.description Thesis (M.S.) University of Alaska Fairbanks, 2001 en_US
dc.description.abstract Winter browsing of birch leads to chemical changes in leaves of the following growing season, potentially generating differences in the quality of leachates derived from leaf litter and in leachate use by stream microorganisms. The effects of moose browsing were tested on leachates from leaves collected from browsed and unbrowsed trees and inoculated with microbial communities. Respiration and bacterial abundance were used to assess qualitative differences in leachates. Microbes cultured in leachates derived from leaves of browsed trees had significantly higher rates of oxygen uptake. There were no significant differences in bacterial abundance between treatments. The basis for the qualitative difference in leachates is likely due to an 89% greater concentration of amino acides in leachates derived from leaves of previously browsed trees. This study provides evidence that winter herbivory of birch can influence the use of leaf leachates by stream microbes, demonstrating coupling between riparian zones and stream ecosystems. en_US
dc.language.iso en_US en_US
dc.title Winter vertebrate browsing of birch: effects on the use of leaf litter leachates by stream microorganisms en_US
dc.type Thesis en_US
dc.type.degree ms en_US
dc.identifier.department Department of Biology and Wildlife


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