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Phytoplankton and ecological assessment of brackish and freshwater coastal lagoons in the Algarve, Portugal
Phytoplankton biomass and composition were monitored for four coastal lagoons of the Algarve, Portugal, from February to November 2006. The phytoplankton community in the freshwater lagoons – Dunas Douradas (FW1) and Garrão (FW2) – as determined by biomarker pigment concentration using high‐performance liquid chromatography and the program chemtax, was dominated by diatoms and chlorophytes. For the brackish lagoons – Salgados (BW1) and Almargem (BW2) – cyanophytes and diatoms were the most important groups respectively. The trophic state indices, based on algal biomass, classify FW1, FW2 and BW1 lagoons as hypertrophic, whereas BW2 is classified as mesotrophic. Signs of eutrophication in the former lagoons include large phytoplankton biomass (chlorophyll‐a) fluctuations, the presence of phytoplankton taxa that usually thrive under nutrient‐enriched conditions and high concentrations of chlorophyll‐a‐degradation products. Chemotaxonomic analyses derived from high‐performance liquid chromatography data might constitute a valuable tool for achieving Water Framework Directive requirements for an evaluation system based on phytoplankton taxonomic composition.
Phytoplankton and ecological assessment of brackish and freshwater coastal lagoons in the Algarve, Portugal
Phytoplankton biomass and composition were monitored for four coastal lagoons of the Algarve, Portugal, from February to November 2006. The phytoplankton community in the freshwater lagoons – Dunas Douradas (FW1) and Garrão (FW2) – as determined by biomarker pigment concentration using high‐performance liquid chromatography and the program chemtax, was dominated by diatoms and chlorophytes. For the brackish lagoons – Salgados (BW1) and Almargem (BW2) – cyanophytes and diatoms were the most important groups respectively. The trophic state indices, based on algal biomass, classify FW1, FW2 and BW1 lagoons as hypertrophic, whereas BW2 is classified as mesotrophic. Signs of eutrophication in the former lagoons include large phytoplankton biomass (chlorophyll‐a) fluctuations, the presence of phytoplankton taxa that usually thrive under nutrient‐enriched conditions and high concentrations of chlorophyll‐a‐degradation products. Chemotaxonomic analyses derived from high‐performance liquid chromatography data might constitute a valuable tool for achieving Water Framework Directive requirements for an evaluation system based on phytoplankton taxonomic composition.
Phytoplankton and ecological assessment of brackish and freshwater coastal lagoons in the Algarve, Portugal
Cartaxana, Paulo (author) / Mendes, Carlos R. (author) / Brotas, Vanda (author)
Lakes & Reservoirs: Research & Management ; 14 ; 221-230
2009-09-01
10 pages
Article (Journal)
Electronic Resource
English
Water budget in coastal brackish lagoons
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