Invasive Species

WARC researchers are performing visual encounter surveys and passively capturing Cuban treefrogs to remove as many of the invasive anurans as possible.

ʻŌhiʻa ( Metrosideros polymorpha ) is the dominant tree in Hawaiian forests, but Rapid ʻŌhiʻa Death (ROD), a newly emerging disease that stands to cause high mortality of this ecologically important tree, may lead to invasions by exotic plants as gaps open in the forest. To better understand if planting of ʻōhiʻa seedlings can be used as a restoration tool, we investigated the survival of ʻōhiʻa...

On April 26th, 2021, Department of Interior Secretary Deb Haaland declared May 2 - 8, 2021 as Amphibain Week! This is in In recognition of the vital importance of amphibians (frogs, toads, and salamanders) to the Nation’s public and private lands. Did you know that the USGS Ecosystems Mission Area is the biological research arm of the U.S. Department of the Interior? USGS Ecosystems Mission Area...

Assessing Impacts of Emerging and Established Diseases to Aquatic Ecosystems The role of disease in freshwater mussel declines has been largely ignored due to the lack of appropriate diagnostic tools. Furthermore, health assessment of mussels in conjunction with restoration and propagation has not been considered during stocking and augmentation activities. This project will develop standard...

Dreissenid mussels have posed an aquatic invasive species challenge in the United States since their arrival in the Great Lakes in the 1980s. Zebra ( Dreissena polymorpha ) and Quagga ( D. bugensis ) mussels are filter feeders with high reproductive capacity. Their behaviors result in altered nutrient cycles, shifts in trophic structures, and extirpation of some native species in systems where...

Management Tools for Dreissenid Mussels Currently, dreissenid mussel populations are spreading and becoming a growing problem in many aquatic systems, making it important to find management techniques that are selective for the invasive mussel populations while leaving the native populations intact. Control technology for dreissenids in open water currently relies on a limited number of...

Management Tools for Dreissenid Mussels Carbon dioxide (CO2) has been suggested as a chemical control for a variety of invasive aquatic organisms, including Asian Carp. USGS researchers and partners evaluated the efficacy of low CO2 concentrations for preventing zebra mussel larval (veliger) settlement and during summer 2019 in a harbor of the upper Mississippi River. The lowest CO2 concentration...

Management Tools for Dreissenid Mussels USGS researchers and partners conducted an experimental application of low dose copper, as EarthTecQZ, to a bay in Lake Minnetonka, Minnesota. The veliger density and settlement were compared to that of an untreated bay within the same lake. The copper application produced a substantial reduction in zebra mussel abundance of early life stages, juvenile...

WARC researchers are exploring relationships between body size, time of year, sex, and reproductive development to better understand the reproductive phenology of the New Orleans population of Cuban treefrogs compared to Florida populations.

The environmental DNA (eDNA) samples collected, processed, and sequenced by the Upper Midwest Environmental Sciences Center (UMESC) and partner agencies are being archived in a cloud-based database application. Consolidating eDNA data will significantly improve researchers and managers ability to visualize, analyze, and integrate sequence data as a monitoring and early detection system for...

Recent popular news has implied that Weed-Suppressive Bacteria (WSB) holds promise for cheatgrass control, yet a lack of peer-reviewed research exists to support this claim. USGS researchers stepped up to the challenge of objectively and rigorously evaluating the effectiveness of WSB for controlling exotic annual grasses, such as Cheatgrass and Medusahead, while also examining its impact on native...

Populations of Hypophthalmichthys molitrix (silver carp) and Hypophthalmichthys nobilis (bighead carp), (together referred to herein as “bigheaded carp”) have increased exponentially in the greater Mississippi River Basin. Detrimental effects on native fish and economically important fisheries have occurred where these invasive, filter-feeding fish are abundant.