Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted.  For more information, please see www.doi.gov/shutdown

Land and Water Management

Science Center Objects

USGS research in advanced technologies, use of remote sensing, and research and monitoring in large river systems across the U.S. uniquely positions the USGS Fisheries Program to contribute to practical applications of landscape science.

Learn more about our research by visiting the web pages below.


Population Dynamics of Endangered Humpback Chub in Grand Canyon

Science Center: Southwest Biological Science Center

Whereas the pre-dam Colorado River experienced large seasonal variation in temperature and discharge and was highly turbid, the post-dam Colorado River is far less variable in terms of temperature and discharge and is frequently clear. Many nonnative fish species had already been introduced to the Colorado River or its tributary prior to dam completion, and some thrive in this altered environment. 


River Productivity

Science Center: Upper Midwest Environmental Science Center

Production is a measure of energy flow, and is therefore a natural currency for ecosystems. A sound understanding of biological production is essential to the effective science-based management of ecosystems.


Movement Patterns of Native Mussels in the Upper Mississippi River: Response to Water Level Management

Science Center: Upper Midwest Environmental Science Center

Resource managers are lowering water levels in some areas of the Upper Mississippi River to restore shallow-water habitats for plants. However, this water level management technique, referred to as drawdown, may have unintended effects on native mussel populations. 


Distribution and Controls Over Habitat and Food Web Structures and Processes in Great Lakes Estuaries

Science Center: Upper Midwest Environmental Science Center

Rivermouth ecosystems, or freshwater estuaries, are the focus of human and wildlife interactions with the Great Lakes. They are highly valued as the region’s urban, industrial, shipping and recreational centers; and home to recreational harbors, wildlife viewing and production, beaches and urban riverfronts. 


Habitat Remediation

Science Center: Great Lakes Science Center

Over the past two centuries, Great Lakes ecosystems have endured significant changes, many of which drastically altered life in the region. To successfully remediate the Great Lakes ecosystem, researchers must provide sound data that allow resource managers to make informed decisions. 


Modeling Tidal Freshwater Forested Wetlands (TFFW) Habitat Changes for Land Management

Science Center: Wetland and Aquatic Research Center

As tidal freshwater forested wetlands - TFFWs - are influenced by salinty due to salt water intrusion, they may experience changes in plant community composition, growth, and productivity. 


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