Assessing invasive plant infestation and disturbance gradients in a freshwater wetland using a GIScience approach |
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Authors: | Nathan M Torbick Brian L Becker Sarah L Hession Jiaguo Qi Gary J Roloff R Jan Stevenson |
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Institution: | (1) Applied Geosolutions, 403 Kent Place, Newmarket, NH 03857, USA;(2) Department of Geography, Central Michigan University, Mount Pleasant, MI 48859, USA;(3) Department of Geography & Center for Global Change and Earth Observation, Michigan State University, East Lansing, MI 48824, USA;(4) Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA;(5) Department of Zoology, Michigan State University, East Lansing, MI 48824, USA |
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Abstract: | The assessment of aquatic ecosystems requires information on biological and disturbance gradients in order to evaluate quality.
As a result decision makers need improved monitoring tools for characterizing relationships between invasive species infestation
and disturbance to make informed choices regarding wetland condition and management plans. The overarching goal of this research
was to assess invasive plant infestation and disturbance gradients using a GIScience approach. The study was conducted in
a fresh-water, coastal wetland in the Muskegon River watershed, Michigan, USA. Airborne hyperspectral imagery (20 bands, 440–880 nm)
was classified for Phragmites australis distribution using the Spectral Angle Mapper algorithm. Indicator semivariograms were utilized to define landscape structure
and associated spatial scales, and assist in creating a transect scheme to generate landscape pattern metrics quantifying
valued ecosystem attributes. Hydrological modifications, as measured by an area-weighted fractal dimension index, served as
a proxy for human disturbance and was found to moderately influence Phragmites percent cover (R
2 = 0.4, n = 40), mean patch size (R
2 = 0.5), and patch shape (R
2 = 0.5). A general conclusion was that increased hydrological disturbances were correlated with increased infestation magnitude.
The systematic approach executed in this study outlined how geospatial monitoring tools can be used as an assessment framework
to provide more meaningful information that lends itself to comprehensive wetlands assessment. |
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