Invasive Species Program


More than 6,500 nonindigenous species are now established in the United States, posing risks to native plants, animals, microorganisms, valued ecosystems, and human and wildlife health. In fact, the current annual environmental, economic, and health-related costs of invasive species exceed those of all other natural disasters combined.

Nonindigenous Aquatic Species (NAS) Database

Nonindigenous Aquatic Species (NAS) Database

The NAS database is a central repository for spatially referenced biogeographic accounts of introduced aquatic species. The program provides scientific reports, online/realtime queries, spatial data sets, distribution maps, and general in

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Turning to eDNA to Detect Invasive Species

Turning to eDNA to Detect Invasive Species

Adam Sepulveda, research zoologist at the USGS Northern Rocky Mountain Science Center, explains how we are using environmental DNA to detect invasive species.

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Looking for a Particular Species?

USGS scientists study hundreds of invasive species.

Invasive Animals

Invasive Pathogens

Invasive Plants

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Date published: November 2, 2018

Vegetative Community Response to Landscape Scale Post-fire Herbicide (Imazapic) Application

The timing of herbicide application following wildfire can strongly influence its effectiveness. USGS researchers evaluated the effect of the commonly used herbicide imazapic on targeted exotic annual grasses and non-target plants, applied the first winter or second fall after the 2015 Soda wildfire. 

Date published: September 22, 2016

Burmese Python Hatchlings Seen on Key Largo

Burmese pythons have been found on Key Largo.

Date published: June 14, 2016

Moving Barges Have Potential to Transport Invasive Fish

When a moving barge encounters small fish in the Illinois Waterway there is a possibility that the fish will become trapped in the gap between barges, according to a new study by the U.S. Fish and Wildlife Service and the U.S. Geological Survey.


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Year Published: 2017

Veligers of the invasive Asian clam Corbicula fluminea in the Columbia River Basin: Broadscale distribution, abundance, and ecological associations

The invasive Asian clam Corbicula fluminea was introduced to North America in the 1930s and now inhabits most regions of the conterminous United States; however, the distribution and ecology of C. fluminea in the Columbia River Basin is poorly understood. During 2013 and 2014, 5 Columbia-Snake River reservoirs were sampled monthly from May through...

Hassett, Whitney; Bollens, Stephen M.; Counihan, Timothy D.; Rollwagen-Bollens, Gretchen; Zimmerman, Julie; Emerson, Joshua E.
Hassett, W., S.M. Bollens, T.D. Counihan, G. Rollwagen-Bollens, J. Zimmerman, S. Katz, and J. Emerson. 2017. Veligers of the invasive Asian clam Corbicula fluminea in the Columbia River Basin: broadscale distribution, abundance, and ecological associations. Lake Reservoir Manage.

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Year Published: 2017

Early detection monitoring for larval dreissenid mussels: How much plankton sampling is enough?

The development of quagga and zebra mussel (dreissenids) monitoring programs in the Pacific Northwest provides a unique opportunity to evaluate a regional invasive species detection effort early in its development. Recent studies suggest that the ecological and economic costs of a dreissenid infestation in the Pacific Northwest of the USA would be...

Counihan, Timothy D.; Bollens, Stephen M.
Counihan, T.D., and S.M. Bollens. Early detection monitoring for larval dreissenid mussels: how much plankton sampling is enough? Environ. Monit. Assess. 189: 98. DOI: 10.1007/s10661-016-5737-x.

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Year Published: 2015

Dreissenid mussel research priorities workshop

Currently, dreissenid mussels have yet to be detected in the northwestern part of the United States and western Canada. Infestation of one of the jurisdictions within the mussel-free Pacific Northwest would likely have significant economic, soci­etal and environmental implications for the entire region. Understanding the biology and environmental...

Sytsma, Mark; Phillips, Stephen; Counihan, Timothy D.
Sytsma, M.D., S. Phillips, and T.D. Counihan. 2015. Dreissenid mussel research priorities workshop. Center for Lakes and Reservoirs Publications and Presentations. Paper 49.