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Alder cover drives nitrogen availability and decomposition of grass litter in salmon-rearing headwater streams, Kenai Peninsula, Alaska.

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dc.contributor.advisor King, Ryan Steven, 1972-
dc.contributor.author Shaftel, Rebecca, S.
dc.contributor.other Baylor University. Dept. of Biology. en
dc.date.copyright 2010-08
dc.identifier.uri http://hdl.handle.net/2104/8052
dc.description.abstract Terrestrial sources of nitrogen (N), such as N fixed by alder, may be important for sustaining production in headwater streams that typically lack subsidies of nutrients from spawning salmon. High nutrient concentrations in streams increase litter decomposition and can offset the low nutrient quality of grass litter. Alder cover was compared to watershed physiographic variables as predictors of stream N and contrasted over the growing season among 25 headwater streams. Leaf packs of bluejoint grass were deployed for two months across a nutrient gradient of 6 headwater streams. Alder cover explained over 75 – 96% of the variance in stream N. Bluejoint breakdown rates were related to dissolved stream nutrient concentrations and litter quality. A diversity of macroinvertebrate consumers utilized bluejoint for habitat and food. Alder drives stream N concentrations and the breakdown rate of bluejoint, which is an important consumer resource during the summer months when deciduous litter inputs are low. en
dc.rights Baylor University theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. Contact librarywebmaster@baylor.edu for inquiries about permission. en
dc.subject Alnus. en
dc.subject Topographic wetness index. en
dc.subject Nitrogen fixation. en
dc.subject Watershed physiography. en
dc.subject Leaf decomposition. en
dc.subject Food quality. en
dc.subject Phosphorus. en
dc.subject Juvenile salmonids. en
dc.subject Riparian wetlands. en
dc.title Alder cover drives nitrogen availability and decomposition of grass litter in salmon-rearing headwater streams, Kenai Peninsula, Alaska. en
dc.type Thesis en
dc.description.degree M.S. en
dc.rights.accessrights Worldwide access en
dc.contributor.department Biology. en


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