Jason Rohweder
Biography
Education:
1998 M.S., Resource Analysis, Saint Mary’s University of Minnesota
1995 B.S., Ecology, Winona State University
Primary Responsibilities/Activities:
I have interdisciplinary expertise in biology, geographical information systems (GIS) and application programming. My work emphasizes landscape ecology and the creation of flexible tools and models to assess species habitat.
Recent Projects:
- Web mapping application development
- Isle Royale National Park - Modelling spatial and temporal variability in browsing by moose under varying predation scenarios
- Tool and data development in support of the Monarch Conservation Science Partnership
- Management Unit Prioritization Tools
- Anticipated Effects of Development on Habitat Fragmentation and Movement of Mammals Into and Out of the Schoodic District, Acadia National Park, Maine
- Application of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects
- LINK: ArcGIS Tools for Conservation Planning
Science and Products
Understanding constraints on submersed vegetation distribution in a large, floodplain river: the role of water level fluctuations, water clarity and river geomorphology
Aquatic vegetation is a key component of large floodplain river ecosystems. In the Upper Mississippi River System (UMRS), there is a long-standing interest in restoring aquatic vegetation in areas where it has declined or disappeared. To better understand what constrains vegetation distribution in large river ecosystems and inform ongoing efforts to restore submersed aquatic vegetation (SAV),...
Upper Mississippi River System Weighted Wind Fetch Analysis (1989, 2000, 2010/2011)
Wind fetch is defined as the unobstructed distance that wind can travel over water in a constant direction. Fetch is an important characteristic of open water because longer fetch can result in larger wind-generated waves. The larger waves, in turn, can increase shoreline erosion and sediment re-suspension. Wind fetches were calculated using the wind fetch model available from (...
Monarch Conservation Planning Tools
Monarch Conservation Science Partnership Online Map Viewer
Desktop Monarch Conservation Planning Tools
Jason Rohweder, Wayne E. Thogmartin
U.S. Geological Survey, Upper Midwest Environmental Sciences Center
Monarch Conservation Science Partnership Map Viewer and Tools
This web mapping application is a repository for data and tools that support the Monarch Conservation Science Partnership.
Decision Support Systems
A Decision Support System (DSS) can be defined in many ways. The working definition the Upper Midwest Environmental Sciences Center (UMESC) uses is, "A spatially based computer application or data that assists a researcher or manager in making decisions." This is quite a broad definition and it needs...
Application of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects - 2012 Update
- Models based upon coastal engineering equations have been developed to quantify wind fetch length and several physical wave characteristics including significant height, length, peak period, maximum orbital velocity, and shear stress
- These models, modified to operate using Environmental Systems Research Institute's ArcGIS 10.0/10.1 Geographic Information System platform, were ...
Monarch Conservation Science Partnership
The Challenge
Over the last two decades, the Eastern migratory population of monarch butterflies has declined by about 80%, leading many scientists to consider how to best conserve and rebuild monarch populations. Conservation efforts can be challenging to design and execute because of the multi-generational migration of monarchs that spans North America....
Understanding constraints on submersed vegetation distribution in a large, floodplain river: The role of water level fluctuations, water clarity and river geomorphology
Aquatic vegetation is a key component of large floodplain river ecosystems. In the Upper Mississippi River System (UMRS), there is a long-standing interest in restoring aquatic vegetation in areas where it has declined or disappeared. To better understand what constrains vegetation distribution in large river ecosystems and inform ongoing efforts...
Carhart, Alicia; Kalas, John; Rogala, James T.; Rohweder, Jason J.; Drake, Deanne C.; Houser, Jeffrey N. Quantifying and mapping inundation regimes within a large river‐floodplain ecosystem for ecological and management applications
Spatial information on the distribution of ecosystem patterns and processes can be a critical component of designing and implementing effective management programs in river‐floodplain ecosystems. For example, translating how flood pulses detected within a stream gauge record are spatially manifested across a river‐valley bottom can be used to...
Van Appledorn, Molly; De Jager, Nathan R.; Rohweder, Jason J. Upper Mississippi River system weighted wind fetch analysis (1989, 2000, 2010/2011)
Wind fetch is defined as the unobstructed distance that wind can travel over water in a constant direction. Fetches are limited by landforms surrounding the body of water. Fetch is an important characteristic of open water because longer fetches can result in larger wind-generated waves. The larger waves, in turn, can increase shoreline erosion...
Rohweder, Jason J.; Rogala, James T. Climate change Is likely to alter future wolf - moose - forest interactions at Isle Royale National Park, United States
We evaluated how climate change and variable rates of moose browsing intensity, as they relate to wolf predation, might affect the forests of Isle Royale National Park, Michigan, United States by conducting a modeling experiment. The experiment consisted of contrasting three different scenarios of wolf management and with a static (current...
De Jager, Nathan R.; Rohweder, Jason J.; Duveneck, Matthew J.
A hydrogeomorphic classification of connectivity of large rivers of the Upper Midwest, United States
River connectivity is defined as the water-mediated exchange of matter, energy, and biota between different elements of the riverine landscape. Connectivity is an especially important concept in large-river corridors (channel plus floodplain ) because large rivers integrate fluxes of water, sediment, nutrients, contaminants, and other transported...
Jacobson, Robert B.; Rohweder, Jason J.; De Jager, Nathan R. Exploring silica stoichiometry on a large floodplain riverscape
Freshwater ecosystems are critical zones of nutrient and carbon (C) processing along the land-sea continuum. Relative to our understanding of C, nitrogen (N), and phosphorus (P) cycling within the freshwater systems, the controls on silicon (Si) cycling and export are less understood. Understanding Si biogeochemistry and its coupled biogeochemical...
Carey, Joanna C.; Jankowski, Kathi Jo; Julian, Paul; Sethna, Lienne; Thomas, Patrick; Rohweder, Jason J. Spatially explicit modelling of floodplain forest succession: Interactions among flood inundation, forest successional processes, and other disturbances in the Upper Mississippi River floodplain, USA
Simulation models are often used to identify hydrologic regimes suitable for different riparian or floodplain tree species. However, most existing models pay little attention to forest successional processes or other disturbances that may interact with the hydrologic regime of river systems to alter forest dynamics in space and time. In...
De Jager, Nathan R.; Van Appledorn, Molly; Fox, Timothy J.; Rohweder, Jason J.; Guyon, Lyle J.; Meier, Andrew R.; Cosgriff, Robert J.; Vandermyde, Benjamin J.
Upper Mississippi River Restoration Program Long Term Resource Monitoring element—Spatial data query tool
The Upper Mississippi River Restoration (UMRR) Program Long Term Resource Monitoring (LTRM) element has been monitoring fish, water quality, and vegetation in six study pools in the Upper Mississippi River system for approximately 30 years. Geographic locations were recorded for all sampling points. All of this information has been made publicly...
Rohweder, Jason J.
Indicators of ecosystem structure and function for the Upper Mississippi River System
This report documents the development of quantitative measures (indicators) of ecosystem structure and function for use in a Habitat Needs Assessment (HNA) for the Upper Mississippi River System (UMRS). HNAs are led periodically by the U.S. Army Corps of Engineers’ Upper Mississippi River Restoration (UMRR) Program, which is the primary habitat...
De Jager, Nathan R.; Rogala, James T.; Rohweder, Jason J.; Van Appledorn, Molly; Bouska, Kristen L.; Houser, Jeffrey N.; Jankowski, Kathi Jo Restoring monarch butterfly habitat in the Midwestern US: 'All hands on deck'
The eastern migratory population of monarch butterflies (Danaus plexippus plexippus) has declined by >80% within the last two decades. One possible cause of this decline is the loss of ≥1.3 billion stems of milkweed (Asclepias spp.), which monarchs require for reproduction. In an effort to restore monarchs to a population goal established...
Thogmartin, Wayne E.; Lopez-Hoffman, Laura; Rohweder, Jason J.; Diffendorfer, James E.; Drum, Ryan G.; Semmens, Darius J.; Black, Scott; Caldwell, Iris; Cotter, Donita; Drobney, Pauline; Jackson, Laura L.; Gale, Michael; Helmers, Doug; Hilburger, Steven B.; Howard, Elizabeth; Oberhauser, Karen S.; Pleasants, John M.; Semmens, Brice X.; Taylor, Orley R.; Ward, Patrick; Weltzin, Jake F.; Wiederholt, Ruscena Modelling moose–forest interactions under different predation scenarios at Isle Royale National Park, USA
Loss of top predators may contribute to high ungulate population densities and chronic over-browsing of forest ecosystems. However, spatial and temporal variability in the strength of interactions between predators and ungulates occurs over scales that are much shorter than the scales over which forest communities change, making it difficult to...
De Jager, Nathan R.; Rohweder, Jason J.; Miranda, Brian R.; Sturtevant, Brian R.; Fox, Timothy J.; Romanski, Mark C.