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| NAS - Nonindigenous Aquatic Species |
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Common Name: diatom
Taxonomy: available through 
Identification:
The cells of this species are oblong-shaped with narrow knob-like poles. They somewhat resemble rolling-pins with shortened handles. Their outer surface exhibits horizontal, parallel markings. Description based on Pfister (1992). Also see Kelly et al. (2005).
D. ehrenbergii is around 30–120 µm long and 6–9 µm wide (Pfister 1992; Kelly et al. 2005).
Size: 30-120 microns in length
Native Range:
Unknown. D. ehrenbergii is widespread. It has been recorded from such places as Poland (Kawecka and Sanecki 2003), Antarctica (Kawecka and Olech 1998), Italy (Bona et al. 2007), France (Eulin and Le Cohu 1998), and Turkey (Dere et al. 2002).
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Hawaii |
Caribbean |
Interactive maps: Continental US, Alaska, Hawaii, Caribbean
Nonindigenous Occurrences: D. ehrenbergii was recorded for the first time from Lake Michigan in the 1930s and in subsequent years from Lake Huron (Stoermer and Yang 1969; Mills et al. 1993).
Ecology: D. ehrenbergii occurs in fresh to brackish water. It has been recorded in mesotrophic to eutrophic conditions and can occur in the plankton, epiphytically, and epilithically. It is often considered somewhat alkalphilic. It may occur amongst oligosaprobic to beta-mesosaprobic assemblages (Stoermer et al. 1971; Mills et al. 1993; Eulin and Le Cohu 1998; Dere et al. 2002; Bona et al. 2007).
Means of Introduction: D. ehrenbergii was very likely introduced in ballast water to the Great Lakes (Mills et al. 1993).
Status: Established where recorded.
Impact of Introduction: Unknown.
Remarks:
References
Bona, F., E. Falasco, S. Fassina, B. Griselli, and G. Badino. 2007. Characterization of diatom assemblages in mid-altitude streams of NW Italy. Hydrobiologia 583:265-274.
Dere, S., D. Karacauglu, and N. Dalkiran. 2002. A study on the epiphytic algae of the Nilufar stream (Bursa). Turkish Journal of Botany 26:219-233.
Eulin, A. and R. Le Cohu. 1998. Epilithic diatom communities during the colonization of artificial substrates in the River Garonne (France). Comparison with the natural communities. Archiv fuer Hydrobiologie 143(1):79-106.
Kawecka, B. and J. Sanecki. 2003. Didymosphenia geminata in running waters of southern Poland – symptoms of change in water quality? Hydrobiologia 495:193-201.
Kawecka, B. and M. Olech. 1998. Diatom communities in small water bodies at H. Arctowski Polish Antarctic Station (King George Island, South Shetland Islands, Antarctica). Polar Biology 19:183-192.
Kelly, M. G., H. Bennion, E. J. Cox, B. Goldsmith, J. Jamieson, S. Juggins, D. G. Mann, and R. J. Telford. 2005. Common freshwater diatoms of Britain and Ireland: an interactive key. Environment Agency, Bristol. Accessed 18/11/2007
Mills, E. L., J. H. Leach, J. T. Carlton, and C. L. Secor. 1993. Exotic species in the Great Lakes: a history of biotic crises and anthropogenic introductions. Journal of Great Lakes Research 19(1):1-54.
Pfister, P. 1992. Phytobenthos communities from 2 Tyrolean mountain streams: part 2. Diatomophyceae. Archiv fur Hydrobiologie Supplement 94:35-72.
Stoermer, E. F. and J. J. Yang. 1969. Plankton diatom assemblages in Lake Michigan. Great Lakes Research Division, University of Michigan, Special Report No. 47.
Stoermer, E. F., S. M. Taylor, and E. Callender. 1971. Paleoecological interpretation of the Holocene diatom succession in Devils Lake, North Dakota. Transactions of the American Microscopical Society 90(2):195-206.
Other Resources: Great Lakes Diatoms
Author: Rebekah M. Kipp
Contributing Agencies: 
NOAA - GLERL
Revision Date: 7/4/2007 Citation for this information:
Rebekah M. Kipp. 2009. Diatoma ehrenbergii. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=1670> Revision Date: 7/4/2007
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