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http://hdl.handle.net/10773/28402
Title: | Daily availability of nutrients and metals in a eutrophic meso-tidal coastal lagoon (Obidos lagoon, Portugal) |
Author: | Pereira, Patrícia de Pablo, Hilda Carvalho, Susana Vale, Carlos Pacheco, Mário |
Keywords: | Eutrophication Day–night cycles Nutrients Metals Environmental health assessment Óbidos lagoon |
Issue Date: | Oct-2010 |
Publisher: | Elsevier |
Abstract: | This baseline reports daily variations of physico-chemical parameters, nutrients and metals in water of two sites [eutrophic conditions (BB) versus reference (LL)] in Obidos coastal lagoon (Portugal). Dissolved oxygen in BB varied between 40% saturation levels (night) and 190% (daylight). NH(4)(+), PO(4)(3-) and ratios to Al of Mn, Fe and Pb in suspended particulate matter increased during the period of lower oxygenation, indicating exportation of nutrients and metals from the sediment to water at night. At LL, O(2) values oscillated always around 100%. PO(4)(3-) and Mn/Al ratio at LL were always lower than at BB and no increases were found during the night. The input of PO(4)(3-) and Mn provided from the sediment at BB during the night could surpass the contribution of freshwater discharges. PCA confirmed the separation of most samples from BB and LL. These results pointed to the importance of assessing chemical conditions over day-night cycles. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/28402 |
DOI: | 10.1016/j.marpolbul.2010.07.021 |
ISSN: | 0025-326X |
Appears in Collections: | CESAM - Artigos DBio - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Pereira et al. - 2010 - Daily availability of nutrients and metals in a eu.pdf | 317.94 kB | Adobe PDF |
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