Abstract
An intense bloom of Tetraselmis sp., producing strong water discoloration was observed from December 28th of 2005 through January 10th of 2006 in the Valparaiso Bay (32Âo 57’S; 71Âo 33’W). Blooms of Tetraselmis sp. have never been reported in this bay, or along the coast of Chile. The confluence of a series of environmental conditions observed before and during the bloom such as: high solar radiation, anomalous UV radiation levels, high sea surface temperatures, water stratification and high nutrient concentrations may have contributed to the development of this unique event.
Highlights
Algal blooms are recurring events in coastal regions frequently associated with high nutrients concentrations, of phosphorus and nitrogen
The bloom was unique for its magnitude and monoculture type resemblance as shown by the Ap(λ) and shape of the spectra
Chlorophyll b is distinctive of the Prasinophyceae taxonomic group
Summary
Algal blooms are recurring events in coastal regions frequently associated with high nutrients concentrations, of phosphorus and nitrogen. Blooms of Tetraselmis sp., a microflagellate of the group Prasinophyceae, have never been observed in the Valparaiso Bay waters, or along the coast of Chile. Blooms, producing intense water discoloration have been reported; the first at the Frank Kitts Lagoon, Wellington Harbor, New Zealand on December 10th of 1993, the second at the Saldanha Bay, South Africa on January 15th of 2003 [2,3]. During the bloom at Frank Kitts Lagoon, Tetraselmis sp., reached concentrations from 7.7 x to 1.9 x cells mL-1, other small flagellates such as, Cryptomonas spp. and Pyramimonas spp. were observed at lower concentrations (3.2 x 102 to 5.5 x 102 cells mL1). During the Saldanha bay bloom, only visual observations were reported. In the Northern Hemisphere, small blooms of Tetraselmis sp
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