Humboldt State University



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dc.contributor.advisor O'Dowd, Alison en Lagarde, Luc A. en 2012-08-14T14:51:26Z en 2012-08-14T14:51:26Z en 2012-06 en
dc.identifier.uri en
dc.description Thesis (M.S.)--Humboldt State University, Natural Resources: Environmental and Natural Resource Sciences, 2012 en
dc.description.abstract Comprehensive primary productivity measurements of the impact of invasive species are important environmental indicators. This study obtained measurements of the impact of invasive Spartina densiflora on the primary productivity of a Humboldt Bay (California) salt marsh using above and belowground biomass measurements coupled with paired closed-chamber carbon dioxide flux measurements. Compared to samples dominated by native vegetation, samples dominated by S. densiflora displayed higher aboveground net primary productivity, lower belowground net primary productivity, lower net primary productivity, and lower net ecosystem exchange measurements; thus, S. densiflora colonization reduced primary productivity. Benthic macroalgal cover was a strong predictor of net ecosystem exchange. In plots dominated by S. densiflora, less benthic macroalgae was present and less photosynthetically active radiation reached the substratum. Therefore, increased shading of the sediment surface in plots dominated by S. densiflora contributed to lower net ecosystem exchange measurements. These results greatly improve our understanding of the impact of S. densiflora on the primary productivity of Humboldt Bay salt marsh ecosystems. en
dc.description.sponsorship This publication was prepared by Luc Lagarde under NOAA Grant #NA10OAR4170060, California Sea Grant College Program Project #R/ANS-213EPD, through NOAA’s National Sea Grant College Program, U.S. Dept. of Commerce; and was supported in part by California Conservation Corps. The statements, findings, conclusions and recommendations are those of the author and do not necessarily reflect the views of California Sea Grant, California Conservation Corps, NOAA, or the U.S. Dept. of Commerce. en
dc.language.iso en_US en
dc.publisher Humboldt State University en
dc.subject Primary productivity en
dc.subject Spartina densiflora en
dc.subject Invasive species en
dc.subject Humboldt Bay, California en
dc.subject Carbon dioxide flux en
dc.subject Net ecosystem exchange en
dc.subject Algae en
dc.subject Salt marsh en
dc.title Invasive Spartina densiflora Brongn. Reduces primary productivity in a northern California salt marsh en
dc.type Thesis en
dc.description.program Natural Resources en

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