Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.3/2102
Título: Coccolithophore species as indicators of surface oceanographic conditions in the vicinity of Azores islands
Autor: Silva, Alexandra A.
Brotas, Vanda
Valente, A.
Sá, C.
Diniz, Tania
Patarra, Rita F.
Álvaro, Nuno V.
Neto, Ana I.
Palavras-chave: Coccolithophores
HPLC Pigments
Azores Archipelago
Atlantic Ocean
Data: Jan-2013
Editora: Elsevier
Citação: Silva A, Brotas V, Valente A, Diniz T, Sá C, Patarra RF, Álvaro NV & & Neto AI (2013). "Coccolithophore species as indicators of surface oceanographic conditions in the vicinity of Azores islands". «Estuarine, Costal and Shelf Science», 118: 50-59, DOI: 10.1016/j.ecss.2012.12.010.
Resumo: During summer 2008 and spring 2009, surface oceanographic surveys were carried out around three islands of the Azores archipelago (Terceira, São Miguel and Santa Maria) to assess the phytoplankton distribution and associated physico-chemical processes. The Azores archipelago is a major feature in the biogeochemical North Atlantic Subtropical Gyre (NAST) province although its influence on the productivity of the surrounding ocean is poorly known. Surface phytoplankton was studied by microscopy and HPLC (High Precision Liquid Chromatography). The mean values for biomass proxy Chlorophyll a (Chla) ranged from 0.04 to 0.55 μg Lˉ¹ (Chla maximum = 0.86 μg Lˉ¹) and coccolithophores were the most abundant group, followed by small flagellates, Cyanobacteria, diatoms and dinoflagellates being the least abundant group. The distribution of phytoplankton and coccolithophore species in particular presented seasonal differences and was consistent with the nearshore influence of warm subtropical waters from the south Azores current and colder subpolar waters from the north. The satellite-derived circulation patterns showed southward cold water intrusions off Terceira and northward warm water intrusions off Santa Maria. The warmer waters signal was confirmed by the subtropical coccolithophore assemblage, being Discosphaera tubifera a constant presence under these conditions. The regions of enhanced biomass, either resulting from northern cooler waters or from island induced processe, were characterized by the presence of Emiliania huxleyi. Diatoms and dinoflagellates indicated coastal and regional processe of nutrient enrichment and areas of physical stability, respectively.
Descrição: Copyright © 2013 Elsevier Ltd. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.3/2102
ISSN: 0272-7714 (Print)
1096-0015 (Online)
Versão do Editor: http://dx.doi.org/10.1016/j.ecss.2012.12.010
Aparece nas colecções:DBIO - Artigos em Revistas Internacionais / Articles in International Journals

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