Show simple item record Odebrecht, Clarisse Abreu, Paulo Cesar Oliveira Vergne de Carstensen, Jacob 2016-10-14T13:26:56Z 2016-10-14T13:26:56Z 2015
dc.identifier.citation ODEBRECHT, Clarisse; ABREU, Paulo Cesar Oliveira Vergne de; CARSTENSEN, Jacob. Retention time generates short-term phytoplankton blooms in a shallow microtidal subtropical estuary. Estuarine, Coastal and Shelf Science, v. 162, p. 35-44, 2015. Disponível em: <>. Acesso em: 19 out. 2015. pt_BR
dc.identifier.issn 0272-7714
dc.description.abstract In this study it was hypothesised that increasing water retention time promotes phytoplankton blooms in the shallow microtidal Patos Lagoon estuary (PLE). This hypothesis was tested using salinity variation as a proxy of water retention time and chlorophyll a for phytoplankton biomass. Submersible sensors fixed at 5 m depth near the mouth of PLE continuously measured water temperature, salinity and pigments fluorescence (calibrated to chlorophyll a) between March 2010 and 12th of December 2011, with some gaps. Salinity variations were used to separate alternating patterns of outflow of lagoon water (salinity <8; 46% of the time) and inflow of marine water (salinity >24; 35% of the time). The two transition phases represented a rapid change from lagoon water outflow to marine water inflow and a more gradually declining salinity between the dominating inflow and outflow conditions. During the latter of these, a significant chlorophyll a increase relative to that expected from a linear mixing relationship was observed at intermediate salinities (10e20). The increase in chlorophyll a was positively related to the duration of the prior coastal water inflow in the PLE. Moreover, chlorophyll a increase was significantly higher during austral spring-summer than autumn-winter, probably due to higher light and nutrient availability in the former. Moreover, the retention time process operating on time scales of days influences the long-term phytoplankton variability in this ecosystem. Comparing these results with monthly data from a nearby long-term water quality monitoring station (1993e2011) support the hypothesis that chlorophyll a accumulations occur after marine inflow events, whereas phytoplankton does not accumulate during high water outflow, when the water residence time is short. These results suggest that changing hydrological pattern is the most important mechanism underlying phytoplankton blooms in the PLE. pt_BR
dc.language.iso eng pt_BR
dc.publisher Elsevier pt_BR
dc.rights restrict access pt_BR
dc.subject Saltwater inflow pt_BR
dc.subject Light limitation pt_BR
dc.subject Biomass accumulation pt_BR
dc.subject Choked lagoon pt_BR
dc.subject Sediment resuspension pt_BR
dc.title Retention time generates short-term phytoplankton blooms in a shallow microtidal subtropical estuary pt_BR
dc.type article pt_BR
dc.identifier.doi 10.1016/j.ecss.2015.03.004 pt_BR

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