Physico-chemical and nutrient variable stratifications in the water column and in macroalgal thalli as a result of high biomass mats in a non-tidal shallow-water lagoon |
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| Institution: | 1. Centro de Estudios Avazados en Zonas Áridas (CEAZA), Coquimbo, Chile;2. Centro de Investigación e Innovación para el Cambio Climático (CiiCC), Universidad Santo Tomás, Santiago, Chile;3. King Abdullah University of Science and Technology (KAUST), Red Sea Research Center (RSRC), Thuwal, 23955-6900, Saudi Arabia;1. Laboratoire des Sciences de l''Environnement Marin (LEMAR) UMR 6539 CNRS UBO IRD IFREMER, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, 29280 Plouzané, France;2. Département de Sciences Biologiques, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada;3. Observatoire Marin, UMS 3113 CNRS, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, 29280 Plouzané, France |
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| Abstract: | A field study to check parameter stratification during high density growth of four opportunistic macroalgae was carried out in Orbetello lagoon (Italy). The effects of macroalgal masses were compared with a seagrass meadow and two lagoon areas with bare bottoms as controls for pH, temperature, dissolved oxygen, salinity, nitrite, nitrate ammonium and orthophosphate. The nutrient content of thalli and sediment redox were measured. Macroalgae showed differences in stratification of thalli nutrient content. Mat with low density and high volume produced stratifications in the water column, but it did not produce nutrient release by sediment. In contrast, high density and low and high volume mats led to sharp falls in dissolved oxygen, with negative values of sediment Eh and anoxic trigger processes that presumably led to release of sediment nutrients. This depended on thallus type: heavy thalli compacted the mat and light ones distributed more widely in the water column. |
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| Keywords: | Eutrophication Macroalgal mat Macroalgal thalli Nutrient Shallow water Top–bottom stratification |
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