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Papers by Tom Hollenhorst
Minnesota Sea Grant as a Final Completion Report for Project Number: R/EH-6-07; University of Min... more Minnesota Sea Grant as a Final Completion Report for Project Number: R/EH-6-07; University of Minnesota Duluth, Natural Resources Reseach Institute
JAWRA Journal of the American Water Resources Association, 2016
Journal of Great Lakes Research, 2016
SCALING AND UNCERTAINTY ANALYSIS IN ECOLOGY, 2006
Journal of Great Lakes Research, 2015
Wetlands, 2011
ABSTRACT Water and associated nutrients can enter freshwater and marine coastal wetlands from bot... more ABSTRACT Water and associated nutrients can enter freshwater and marine coastal wetlands from both watershed and offshore sources. Identifying the relative contribution of these potential sources, and the spatial scale at which sources are influenced by anthropogenic activities, are critical steps in wetland protection and restoration. We developed a hydrology-based classification scheme for Great Lakes coastal wetlands for the purpose of identifying dominant hydrologic influences and water sources. Classes were determined through analysis of data quantifying hydrologic linkages to lake (seiche) and watershed (watershed area, tributary discharge) in 57 wetlands distributed along the U.S. shoreline of the Laurentian Great Lakes. Wetlands were partitioned into four classes of hydrology that were predicted to differ in sources of water. Source water predictions were tested by comparing Chloride (Cl-) concentrations in wetland, lake, and tributary waters of the wetlands in each class. Results confirmed that classification based on quantitative hydrology data was successful in identifying groups of wetlands with similar water sources. Correlations between wetland Cl-, an indicator of anthropogenic disturbance, and agricultural and urban land uses suggest that differences among classes in water sources resulted in differences in the scale at which wetlands were connected to and influenced by landscapes.
Journal of Phycology, 2008
Journal of Great Lakes Research, 2006
Journal of Great Lakes Research, 2007
Journal of Great Lakes Research, 2007
Environmental Monitoring and Assessment, 2005
Environmental Management, 2007
Environmental Management, 2008
Canadian Journal of Fisheries and Aquatic Sciences, 2009
We analyzed data from coastal wetlands across the Laurentian Great Lakes to identify fish assembl... more We analyzed data from coastal wetlands across the Laurentian Great Lakes to identify fish assemblage patterns and relationships to habitat, watershed condition, and regional setting. Nonmetric multidimensional scaling (NMDS) ordination of electrofishing catch-per-effort data revealed an overriding geographic and anthropogenic stressor gradient that appeared to structure fish composition via impacts on water clarity and vegetation structure. Wetlands in Lakes Erie and Michigan with agricultural watersheds, turbid water, little submerged vegetation, and a preponderance of generalist, tolerant fishes occupied one end of this gradient, while wetlands in Lake Superior with largely natural watersheds, clear water, abundant submerged vegetation, and diverse fishes occupied the other. Fish composition was also related to wetland morphology, hydrology, exposure, and substrate, but this was only evident within low-disturbance wetlands. Anthropogenic stress appears to homogenize fish compositi...
Aquatic Ecosystem Health & Management, 2011
Quantifying gradients of anthropogenic stress can inform the development of sample designs, provi... more Quantifying gradients of anthropogenic stress can inform the development of sample designs, provide an important covariate in modeling relationships of response variables, identify reference and highly-disturbed sites, and provide a baseline and guidance to ...
Minnesota Sea Grant as a Final Completion Report for Project Number: R/EH-6-07; University of Min... more Minnesota Sea Grant as a Final Completion Report for Project Number: R/EH-6-07; University of Minnesota Duluth, Natural Resources Reseach Institute
JAWRA Journal of the American Water Resources Association, 2016
Journal of Great Lakes Research, 2016
SCALING AND UNCERTAINTY ANALYSIS IN ECOLOGY, 2006
Journal of Great Lakes Research, 2015
Wetlands, 2011
ABSTRACT Water and associated nutrients can enter freshwater and marine coastal wetlands from bot... more ABSTRACT Water and associated nutrients can enter freshwater and marine coastal wetlands from both watershed and offshore sources. Identifying the relative contribution of these potential sources, and the spatial scale at which sources are influenced by anthropogenic activities, are critical steps in wetland protection and restoration. We developed a hydrology-based classification scheme for Great Lakes coastal wetlands for the purpose of identifying dominant hydrologic influences and water sources. Classes were determined through analysis of data quantifying hydrologic linkages to lake (seiche) and watershed (watershed area, tributary discharge) in 57 wetlands distributed along the U.S. shoreline of the Laurentian Great Lakes. Wetlands were partitioned into four classes of hydrology that were predicted to differ in sources of water. Source water predictions were tested by comparing Chloride (Cl-) concentrations in wetland, lake, and tributary waters of the wetlands in each class. Results confirmed that classification based on quantitative hydrology data was successful in identifying groups of wetlands with similar water sources. Correlations between wetland Cl-, an indicator of anthropogenic disturbance, and agricultural and urban land uses suggest that differences among classes in water sources resulted in differences in the scale at which wetlands were connected to and influenced by landscapes.
Journal of Phycology, 2008
Journal of Great Lakes Research, 2006
Journal of Great Lakes Research, 2007
Journal of Great Lakes Research, 2007
Environmental Monitoring and Assessment, 2005
Environmental Management, 2007
Environmental Management, 2008
Canadian Journal of Fisheries and Aquatic Sciences, 2009
We analyzed data from coastal wetlands across the Laurentian Great Lakes to identify fish assembl... more We analyzed data from coastal wetlands across the Laurentian Great Lakes to identify fish assemblage patterns and relationships to habitat, watershed condition, and regional setting. Nonmetric multidimensional scaling (NMDS) ordination of electrofishing catch-per-effort data revealed an overriding geographic and anthropogenic stressor gradient that appeared to structure fish composition via impacts on water clarity and vegetation structure. Wetlands in Lakes Erie and Michigan with agricultural watersheds, turbid water, little submerged vegetation, and a preponderance of generalist, tolerant fishes occupied one end of this gradient, while wetlands in Lake Superior with largely natural watersheds, clear water, abundant submerged vegetation, and diverse fishes occupied the other. Fish composition was also related to wetland morphology, hydrology, exposure, and substrate, but this was only evident within low-disturbance wetlands. Anthropogenic stress appears to homogenize fish compositi...
Aquatic Ecosystem Health & Management, 2011
Quantifying gradients of anthropogenic stress can inform the development of sample designs, provi... more Quantifying gradients of anthropogenic stress can inform the development of sample designs, provide an important covariate in modeling relationships of response variables, identify reference and highly-disturbed sites, and provide a baseline and guidance to ...