Introduced and Cryptogenic Species of the North Atlantic

Rapid Assessment Surveys

In August 2000 and 2003, a team of taxonomic experts examined floating docks and piers throughout the New England coast to identify native and non-native species. This rapid assessment survey identified 34 introduced organisms, several of which were identified for the first time in this region, and 37 organisms whose native geographic distribution is unknown (referred to as cryptogenic). A report on this study is available for download (2.2MB PDF file). For more information on the Rapid Assessment Surveys, see the RAS Fact Sheet.

Carcinus maenus, the European Green Crab, was introduced to North America in the 1800's. This predator now ranges from Nova Scotia to Delaware. Photo Credit: Paul Erickson

Invasive Species Maps

The maps available through the link below depict individual sightings of introduced species (non-native species) and cryptogenic species (species of unknown origin). They include data from the rapid assessment surveys discussed above, as well as from the public Hithchhikers Guide program, other research programs, and sightings by individual scientists.

NOW INCLUDES 2003 DATA!
Interactive Map Site
(Opens new window)
NOTE: links to new mapping server (July 2006) - update your bookmarks.
The map viewer may not load in all browsers and operating systems. JavaScript required.

Using the Maps

Dots on the maps indicate sites visited during the surveys, during other research programs, or by individuals. Use the pull-down menus at the top of the map page to select the species you are interested in. The map will update and highlight in yellow the sites at which the selected species was found. You can also use the Info tool to select a site and see a listing of all the species found at that site. In the table that appears, 1=species found, and 0=species not found. For more help, click the "Map & Tool Help" button. Be aware that these data do not reflect the current range extent for any species that we found, but just the locations where someone looked. The organisms are likely to be found at many other sites between and beyond the indicated locations.

Species Descriptions

Information on taxonomic grouping, common name, range, and characteristics for each organism is accessible by clicking on the scientific name above the map, or by going directly to our species description pages below.

Introduced Species descriptions.
Cryptogenic Species descriptions.

Rapid Assessment Survey Participants

The following people participated in the 2000 and/or 2003 Surveys:

Funding

Major funding for the Rapid Assessment Surveys was provided by:
NOAA National Sea Grant
US EPA

For more information on this study, or questions, please contact Dr. Judith Pederson.

These pages are still under development, and not all information will be immediately available. We welcome your comments and suggestions as we continue to develop this site.