Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/26185
Share/Export:
logo share SHARE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

Upwelling-downwelling sequences in the generation of red tides m a coastal upwelling system

AuthorsTilstone, Gavin H.; Figueiras, F. G. CSIC ORCID ; Fraga, Fernando CSIC
KeywordsRed tides
Upwelling-downwelling cycles
Galician coast
Rias Baixas
Issue DateSep-1994
PublisherInter Research
CitationMarine Ecology Progress Series 112: 241-253 (1994)
AbstractDifferences in temporal and spatial hydrographic conditions, water circulation patterns derived from temperature-salinity properties, phytoplankton community composition and distribution were studied in 4 Ria systems (flooded tectonic valleys) in Galicia, NW Spain, from 18 to 21 September 1986. The Rias are affected by upwelling cycles which introduce nutrient-rich Eastern North Atlantic Water (ENAW). During upwelling relaxation periods, the Rias are prone to red tide outbreaks, especially during autumn. In the northern most Ria (Muros), after an upwelling event on 18 September followed by a weak downwelling, a low chlorophyll a (chl a) maximum occurred over the shelf which corresponded to the distribution of a large dinoflagellate/red tide species community identified by principal component analysis (PCA) and cluster analysis of species. This community was identified in all of the other Rias studied, but at different locations. With stronger downwelling on 21 September in the Ria de Vigo. Ria water and the chl a maximum were confined to the Ria interior, which corresponded to a shift in the large dinoflagellate/red tide community. The chl a maximum in all Rias was predominantly due to Heterosigma carterae. The increase in Gymnodinium catenatum cell numbers, from the northern to the southern Rias, corresponded to stronger downwelling events. It is proposed that upwelling-downwelling sequences, enhanced by the presence of inlets and embayments acting as catchment concentration zones, are important mechanisms for generating red tide blooms in coastal upwelling systems.
Description13 pages, 13 figures, 2 tables.
Publisher version (URL)http://www.int-res.com/abstracts/meps/v112/
URIhttp://hdl.handle.net/10261/26185
ISSN0171-8630
Appears in Collections:(IIM) Artículos

Files in This Item:
File Description SizeFormat
m112p241.pdf2,62 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work

Page view(s)

342
checked on May 17, 2022

Download(s)

247
checked on May 17, 2022

Google ScholarTM

Check


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