The colonial ascidian Didemnum sp. A: Current distribution, basic biology and potential threat to marine communities of the northeast and west coasts of North America
Bullard, Stephan G.
Carman, Mary R.
Whitlatch, R. B.
Miller, R. J.
Valentine, Page C.
Collie, Jeremy S.
McNaught, D. C.
Cohen, A. N.
Asch, Rebecca G.
Dijkstra, Jennifer A.
MetadataShow full item record
KeywordAscidian; Didemnum; Distribution; Fouling; Georges Bank; Invasive species; Nonindigenous; Stellwagen Bank; Tillies Bank; Tunicate
Didemnum sp. A is a colonial ascidian with rapidly expanding populations on the east and west coasts of North America. The origin of Didemum sp. A is unknown. Populations were first observed on the northeast coast of the U.S. in the late 1980s and on the west coast during the 1990s. It is currently undergoing a massive population explosion and is now a dominant member of many subtidal communities on both coasts. To determine Didemnum sp. A’s current distribution, we conducted surveys from Maine to Virginia on the east coast and from British Columbia to southern California on the west coast of the U.S. between 1998 and 2005. In nearshore locations Didemnum sp. A currently ranges from Eastport, Maine to Shinnecock Bay, New York on the east coast. On the west coast it has been recorded from Humboldt Bay to Port San Luis in California, several sites in Puget Sound, Washington, including a heavily fouled mussel culture facility, and several sites in southwestern British Columbia on and adjacent to oyster and mussel farms. The species also occurs at deeper subtidal sites (up to 81 m) off New England, including Georges, Stellwagen and Tillies Banks. On Georges Bank numerous sites within a 147 km2 area are 50-90% covered by Didemnum sp. A; large colonies cement the pebble gravel into nearly solid mats that may smother infaunal organisms. These observations suggest that Didemnum sp. A has the potential to alter marine communities and affect economically important activities such as fishing and aquaculture.
Author Posting. © The Author(s), 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Journal of Experimental Marine Biology and Ecology 342 (2007): 99-108, doi:10.1016/j.jembe.2006.10.020.
Showing items related by title, author, creator and subject.
Auger, Helene; Sasakura, Yasunori; Joly, Jean-Stephane; Jeffery, William R. (2009-12-06)Ascidians have powerful capacities for regeneration but the underlying mechanisms are poorly understood. Here we examine oral siphon regeneration in the solitary ascidian Ciona intestinalis. Following amputation, the ...
Bigger is not always better : offspring size does not predict growth or survival for seven ascidian species Jacobs, Molly W.; Sherrard, Kristin M. (Ecological Society of America, 2010-12)The presumed trade-off between offspring size and quality predicted by life history theory is often invoked to explain the wide range of propagule sizes observed in animals and plants. This trade-off is broadly supported ...
Bullard, Stephan G.; Carman, Mary R.; Rocha, Rosana M.; Dijkstra, Jennifer A.; Goodwin, Anne M. (Regional Euro-Asian Biological Invasions Centre (REABIC), 2011-07-04)Little is known about the ascidian fauna of Pacific Panama. Ascidian surveys were conducted in the southern Gulf of Chiriquí on the Pacific coast of Panama in January 2008 and 2009. Surveys along linear transects at 2-3 m ...