English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/25873
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Microplankton assemblages in three Bias Baixas (Vigo, Arosa and Muros, Spain) with a subsurface chlorophyll maximum: their relationships to hydrography

AutorFigueiras, F. G. ; Pazos, Yolanda
Fecha de publicación1991
EditorInter Research
CitaciónMarine Ecology Progress Series 76: 219-233 (1991)
ResumenDunng summer 1984, when coastal upwelling had diminished, a subsurface chlorophyll maximum (SCM) was found in 3 Galician rías which are charactenzed by strong thermal stratification and a nutricline at 10 to 30 m depth. The SCM. formed directly above the nutricline and was composed mainly of diatoms, although the dinoflagellates Ceratium horridum and Ceratium fusus and the ciliate Mesodinium rubrum were also present. The contribution of M. rubrum was especially important in the center of the Ría de Muros. It was possible to recognize 3 phytoplankton assemblages by means of principal component analysis. Assemblage 1, composed of heterotrophic dinoflagellates and ciliates, was found above the SCM, indicating a possible vertical segregation in the feeding mode when an SCM is formed in the rías. Assemblage 2, consisting of flat dinoflagellates (Dinophysis spp.), elongated diatoms (Nitzschia delicatissima, Rhizosolenia alata gracillina, Nitzschia seriata-like) and the dinoflagellates C. horridum and C. fusus, was present in more oceanic stations, suggesting some kind of interchange between rias and ocean. A third assemblage (diatoms) showed a marked neritic distribution, and was found below the SCM in waters with higher nutrient concentrations. Similarly, canonical correlation analysis showed that all the phytoplankton were characteristic for a post-bloom period, when important trophic relationships began establishing themselves in the system. However, Assemblage 1 was more heterotrophic in character than Assemblage 2. Within this general background there were differences among rias related to hydrography. In Arosa, with a hydrographic structure suggesting more mixing than in the other 2 rías, a cluster composed of diatoms was more abundant and frequent. Muros, with the strongest fluvial input, occupied an intermediate position between Arosa and Vigo.
Descripción15 pages, 12 figures, 3 tables, 4 appendix.
Versión del editorhttp://www.int-res.com/abstracts/meps/v76/
URIhttp://hdl.handle.net/10261/25873
ISSN0171-8630
Aparece en las colecciones: (IIM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
m076p219.pdf1,28 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.