Creatures » Cellular Organisms » Eukaryotes » SAR (Stramenopiles, Alveolates, Rhizaria) » Alveolates » Dinoflagellates » Dinoflagellates » Gonyaulacales » Gonyaulacaceae » Alexandrium « Alexandrium catenella They produce saxitoxins, among other toxins, which lead to paralytic shellfish poisoning. We will map the distribution of cysts and evaluate areas favorable for Alexandrium cyst germination Interesting Facts: Several species, including Alexandrium catenella, are toxic and/or bioluminescent. In 2016 a severe bloom of an Alexandrium species occurred, which was notable for its intensity and geographical extent, extending into new areas to the north of the Patagonian fjords … Alexandrium monilatum is a common HAB (harmful algal bloom) species that historically blooms along the southern Atlantic and Gulf coasts of the U.S., with a recent expansion into the mid-Atlantic region and Chesapeake Bay.A. A review of the dinoflagellate genus Alexandrium occurring in Brazilian coastal waters is presented based on both published information and new data. Alexandrium Catenella bloom February 5th, 2018 Mario Loyola. (A) Frontal view of A. catenella gathered with secretion from the ephyra and (B) Lateral and magnified view of A. catenella gathered with secretion from the ephyra. The detailed description of cell shape, size and thecal plates was accompanied by drawings cells in ventral, dorsal, apical antapical view as Image 5: Alexandrium and Mesodinium, courtesy of W. Gurske. Previous studies identify “seedbeds” of Alexandrium resting stages (cysts) on the bottom near areas where shellfish frequently attain high levels of toxin. The dinoflagellate Alexandrium catenella (Whedon and Kofoid) Balech is widely distributed in temperate coastal waters throughout the world (Hallegraeff, 1993) and is responsible for many outbreaks of paralytic shellfish poisoning (PSP). In Puget Sound, the toxic alga Alexandrium catenella threatens people who eat shellfish contaminated with the algal toxin. The most well known harmful algal bloom (HAB) on the east coast is Alexandrium catenella, also known as the Gulf of Maine “red tide.”This toxic dinoflagellate produces saxitoxins that can accumulate in shellfish and cause paralytic shellfish poisoning in human consumers. Seven Alexandrium species have been recorded from Brazil so far: Alexandrium catenella, Alexandrium fraterculus, Alexandrium gaardnerae, Alexandrium kutnerae, Alexandrium tamiyavanichi, Alexandrium tamutum, and Alexandrium sp. Scientific Name. Aquat. This life stage represents one mechanism by which species might colonize Arctic waters via the advective transport of cysts from southern regions. Alexandrium monilatum. IFCB images. monilatum was first conclusively detected in Chesapeake Bay in 2007, when researchers at VIMS used microscopy and … Collected at … In southern Chile, Alexandrium catenella is the main species generating harmful algal blooms (HABs) and over time it has expanded its range since it was first recorded in the Magallanes region in 1972. It occurs from Maine to New York. Alexandrium catenella strains disperse readily and are highly adaptable to new regions due to this ability to form cysts and overwinter until conditions are suitable for germination and growth. 20 (2007) 51-57 Viability, growth and toxicity of Alexandrium catenella and Alexandrium minutum (Dinophyceae) following ingestion and gut passage in the oyster Crassostrea gigas Viabilité, croissance et toxicité d'Alexandrium catenella et Alexandrium minutum (Dinophyceae) après leur ingestion et leur transit stomacal chez l'huître creuse Crassostrea gigas Alexandrium catenella originally described as Gonyaulax catenella by Whedon and Kofoid (1936) from collected off San Francisco (California) and along the Oregon coast, USA. Living Resour. Distribution. Photographs taken at 12-h exposure of the test showing that ephyrae coexist with Alexandrium catenella ACDH01 (with 3.0 × 10 5 cells L −1).
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