English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/33987
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Seiches stimulate transient biogeochemical changes in a microtidal coastal ecosystem

AuthorsBasterretxea, Gotzon ; Jordi, Antoni ; Garcés, Esther ; Anglès, Silvia ; Reñé, Albert
KeywordsSeiches
Coast
Nutrients
Phytoplankton
Mediterranean Sea
Issue DateFeb-2011
PublisherInter Research
CitationMarine Ecology Progress Series 423 : 15-28 (2011)
AbstractWe examined the short-term hydrodynamic variability associated with atmospherically forced seiches at a microtidal Mediterranean embayment, its influence in nutrient pumping from the sediment, and the response of phytoplankton. During June 2007, 2 episodes of high-frequency atmospheric pressure fluctuations generated resonant sea-level oscillations. The observed sea-level oscillations varied slightly in both spectral composition and energy, exhibiting 3 predominant oscillation periods: 8.1, 15.2, and 32.9 min. Unusual pulsed increases in dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphate (PO4) concentrations in nearshore seawater were observed a few hours after the commencement of the first seiche. Peak nutrient concentrations in DIN (26 µmol l–1) and PO4 (0.35 µmol l–1) were comparable to sediment porewater values, suggesting that the source of enrichment was the hydraulically driven flux through the permeable sediment. Rapid responses in the size spectra of the phytoplankton community, mainly composed of flagellates, were observed in response to perturbations induced by the seiches. Numerical analysis of the submarine porewater exchange revealed that the 8.1 min sea-level oscillations efficiently forced benthic fluxes. This seiche period particularly affected the surveyed area. Our results show a mechanism by which large-scale forcing drives the local ecosystem dynamics, and emphasizes the importance of episodic events in the bottom-up control of microalgal communities in shallow coastal areas.
Description14 pages, 11 figures
Publisher version (URL)http://dx.doi.org/10.3354/meps08949
URIhttp://hdl.handle.net/10261/33987
DOI10.3354/meps08949
ISSN0171-8630
E-ISSN1616-1599
Appears in Collections:(ICM) Artículos
(IMEDEA) Artículos
Files in This Item:
File Description SizeFormat 
Basterretxea_et_al_2011.pdf4,6 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.