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Links between open sea and coastal waters in the NW Mediterranean: Deep water formation and Phaeocystis sp. foam events

AuthorsArin, Laura ; Guillén, Jorge ; Segura i Noguera, María del Mar ; Estrada, Marta
Issue Date30-Oct-2014
CitationICHA New Zealand 2014. Abstract book: 83 (2014)
AbstractA monthly study of the nutrient phytoplankton dynamics in the coastal area of Barcelona, carried out between March 2002 and March 2006, revealed the regular occurrence of winter nutrient concentration maxima followed by a winter-early spring phytoplankton bloom dominated by diatoms and nanoflagellates. The main diatom taxa in the peaks of 2002 to 2005 were Chaetoceros spp. and Pseudo-nitzschia spp. However, in the winter-early spring of 2006, the community was dominated by a bloom of Phaeocystis sp., which was associated to a notable deterioration of coastal water quality due to foam accumulation, and the accompanying diatoms taxa (mainly Bacteriastrum delicatulum and Rhizosolenia cf. imbricata) were different from previous years. Examination of the hydrographical characteristics of the coastal waters during the nutrient enrichment events showed that the main nutrient source for the concentration maxima of 2003 and 2004 was land runoff, while nutrient enrichment originated from intrusions of offshore intermediate waters in 2005 and of offshore surface waters in 2006. This input of open sea surface waters onto the coast could explain the different composition of the diatom community and the dominance of Phaeocystis sp., which is an important component of the winter-spring bloom in offshore waters of the NW Mediterranean. The different fertilization mechanisms in the winters of 2005 and 2006 can be associated to the cold and dry winters of these last two years in the NW Mediterranean, which resulted in a particularly intense formation of deep water, both by cascading and convection
DescriptionThe 16th International Conference on Harmful Algae (ICHA 2014 New Zealand), Advancement Through Shared Science, 27-31 October 2014, Wellington, New Zealand.-- 1 page
Publisher version (URL)http://www.icha2014nz.com/?page_id=36
Appears in Collections:(ICM) Comunicaciones congresos
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