The dominance of cyanobacteria in Mediterranean hypereutrophic lagoons: a case study of Cabras Lagoon (Sardinia, Italy)

Silvia Pulina; Bachisio Mario Padedda; Nicola Sechi; Antonella Lugliè

doi:10.3989/scimar.2011.75n1111

Autores/as

Silvia Pulina Department of Botanical, Ecological and Geological Sciences, University of Sassari
Bachisio Mario Padedda Department of Botanical, Ecological and Geological Sciences, University of Sassari
Nicola Sechi Department of Botanical, Ecological and Geological Sciences, University of Sassari
Antonella Lugliè Department of Botanical, Ecological and Geological Sciences, University of Sassari

DOI:

https://doi.org/10.3989/scimar.2011.75n1111

Palabras clave:

cyanobacteria, fitoplancton, lagunas costeras, eutrofización, Cerdeña, mar Mediterráneo

Resumen

Durante dos años (julio 2007-junio 2009) se monitoreó una proliferación intensa de cianobacterias en la laguna de Cabras, así como los parámetros ambientales y climáticos que determinaron sus variaciones temporales. Durante 17 meses, Chroococcales fue el único orden de cianobacterias en la laguna, del cual células similares a Cyanobium (grupo funcional Z según Reynolds) fueron las más importantes en cuanto a abundancia. En los meses siguientes, las cianobacterias sufrieron cambios drásticos, que ocurrieron simultáneamente con lluvia constante e intensa que dio lugar a una caída brusca de la salinidad de la laguna. Se monitoreó también la sucesión de Oscillatoriales en otoño-invierno (Planktothrix sp. and Pseudanabaena catenata; grupo funcional S1 según Reynolds) y el crecimiento en primavera de Nostocales (Aphanizomenon gracile, Aphanizomenon aphanizomenoides, y Anabaenopsis circularis; grupo funcional H1 según Reynolds). Análisis de Correspondencia Canónica permitieron cuantificar la influencia de las variables ambientales, indicando una estrecha relación entre Chroococcales y salinidad, Oscillatoriales y altos niveles de SRP y proporción DIN/SRP, y Nostocales y bajos niveles de nutrientes, proporción DIN/SRP y salinidad.

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