USGS - science for a changing world

Upper Midwest Environmental Sciences Center

Aquatic Invasive Species Control

Digestive Physiology of Aquatic Invertebrates

Principal Investigator: Jon Amberg

Impact of UMESC Science

The results from this study will provide baseline data that may lead to the development of a targeted delivery system that reduces non-target species mortality when treating waters to control invasive mussels. These types of technologies have the potential to be used by natural resource management agencies to control invasive mussels throughout the United Sates.

Introduction

Current toxicants used to control aquatic invasive species are non-selective and applied as immersion exposures – resulting in equal exposure of native and invasive species to the toxicant. Development of a targeted delivery system which reduces non-target species exposure to the toxicant could greatly enhance selectivity and reduce effects to non-target species. Development of such delivery methodologies will require full understanding of native and invasive species gut enzyme activity and physiology since a targeted delivery system will likely use an oral delivery route.

This studies goal is to identify unique physiological characteristics of the digestive system of zebra mussels Dreissena polymorpha and two species of unionid mussels, three ridge Amblema plicata and plain pocketbook Lampsilis cardium and the caddisfly Hydropsyche orris.  Invertebrates will be captured from the Wisconsin River and two sites on the Mississippi River: one above the confluence of the Wisconsin and Mississippi and another below the confluence.  Invertebrates will be collected monthly from spring through fall.  A combination of isotopic analysis and commercial enzymatic tests will be used to identify compare feeding habits. Unique enzyme activities or increased enzyme activities in zebra mussels could potentially aid in the development of a species-specific toxicant or toxicant delivery system. 

Objective

Identify unique physiological characteristics of the digestive system of zebra mussels Dreissena polymorpha relative to that of native filter-feeding invertebrates.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey

URL: http://www.umesc.usgs.gov/aquatic/aquatic_invasives17.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified: March 2, 2012