Helfrich, Louis A.Neves, Richard J.Parkhurst, James A.2020-03-042020-03-042019http://hdl.handle.net/10919/97166Discusses the extinction of over one million species, including aquatic species. Many of the obstacles to aquatic diversity are man made and caused by invasive species.4 pagesapplitcation/pdfen-USVirginia Cooperative Extension materials are available for public use, re-print, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.Extension publicationhttps://www.pubs.ext.vt.edu/420/420-521/420-521.htmlAquatic environmentBiodiversity