Occurrence, photos, and characteristics of some species of the colonial tunicate genus Didemnum, nuisance species that reproduce rapidly and foul marine habitats (including shellfish aquacultures and fishing grounds), ship's hulls, and maritime structure
Web interface for a database of documented occurrences of lichens in units of the U. S. National Park System. The records were obtained from the scientific literature, from National Park Service reports, and from selected herbaria.
Portal to general information on the National Atlas of the United States with access for producing specialized maps and links to thematic maps including interactive maps, multimedia maps, map layers data warehouse, wall maps, and printable maps.
A national information resource for locating biogeographic accounts of non-indigenous aquatic species in the U.S. Provided are scientific reports, online/real-time queries, spatial data sets, regional contact lists, and general information.