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Title: Bloom of the marine diazotrophic cyanobacterium Trichodesmium erythraeum in the Northwest African Upwelling
Authors: Ramos, Antonio G. 
Martel, Antera 
Codd, Geoffrey A.
Soler Onis,Emilio 
Coca, Josep 
Redondo, Alex
Morrison, Louise F.
Metcalf, James S.
Ojeda, Alicia 
Suárez, Sonia
Petit, Michel
UNESCO Clasification: 250616 Teledetección (Geología)
241705 Biología marina
Keywords: Cyanobacteria
Trichodesmium erythraeum
Remote sensing
NW African Upwelling
Advective jet, et al
Issue Date: 2005
Publisher: 0171-8630
Journal: Marine Ecology - Progress Series 
Abstract: A bloom of the non-heterocystous diazotrophic cyanobacterium Trichodesmium erythraeum Ehrenberg is reported in the Canary Islands Archipelago during August of 2004, the warmest period of a meteorological series recorded by the National Institute of Meteorology (Spain) since 1912. Samples showed massive occurrences of T. erythraeum (1000 filaments ml–1) in different sectors of northern and southern waters off the central Canary Islands. Water analyses also showed a relatively low presence of dinoflagellates and diatoms. Quasi-true colour satellite images of dust storms, elevated sea surface temperature (the warmest satellite-derived record), chlorophyll a and geostrophic current fields showed satellite-derived optical positives of Trichodesmium in an African upwelling advective, jet-drifting westward current off the south Canary Islands. Analyses for cyanotoxins using HPLC found microcystins, which was confirmed by immunoassay, at concentrations from 0.1 to 1.0 µg microcystin-LR equivalents (g–1 dry weight of bloom material). A T. erythraeum bloom such as that observed in August 2004 in the NW African Upwelling does not appear to have been recorded for the area previously. The bloom may have developed due to the exceptionally warm weather and/or to the massive dust storms from the Sahara Desert observed in the NE Atlantic in August 2004.
ISSN: 0171-8630
DOI: 10.3354/meps301303
Source: Marine Ecology Progress Series [ISSN 0171-8630], v. 301, p. 303-305
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