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Satellite observations of bio-optical indicators related to dinoflagellates blooms in selected Mediterranean coastal regions

Barale, Vittorio and Masó, Mercedes and Vila, Magda and Lugliè, Antonella Gesuina Laura and Sechi, Nicola and Giacobbe, Maria Grazia (2005) Satellite observations of bio-optical indicators related to dinoflagellates blooms in selected Mediterranean coastal regions. In: Global developments in environmental earth orbservation from space: 25. Annual Symposium of the European Association of Remote Sensing Laboratories (EARSeL): proceedings, 6-11 June 2005, Porto, Portugal. [S.l.], Millpress. p. 685-696. ISBN 978-90-5966-042-7. Conference or Workshop Item.

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Abstract

Satellite data were used to assess phytoplankton dynamics in the Mediterranean Sea, in relation to blooming episodes of Alexandrium, the dinoflagellates genus which causes most (harmful) algal blooms in the basin. A comparison of in situ data, collected on the coast of Catalonia, Sardinia and Sicily in 2002-2003, with images recorded by the SeaWiFS– albeit hampered by space/time resolution too poor to discern small features in harbours, bays or beach areas, and by other limitations – suggests that the recurrence of Alexandrium is linked to local (near-coastal) factors, and only occasionally to larger mesoscale features typical of open waters. Examples are provided of the frequent decoupling between inshore and offshore blooming regimes, even in those cases when they seem to co-vary (e.g. considering inter-annual variability). Correspondences between imaged patterns and Alexandrium outbursts are seen to occur episodically, implying that the processes shaping the local (harmful) algal blooms and the regional blooms are different, or overlap only marginally. Thus, local measurements cannot be taken as representative of “larger scale” phenomena, while the satellite data might be useful to place local events into a regional contest, but not to explore the dynamics of “smaller scale” phenomena, which require direct in situ monitoring.

Item Type:Conference or Workshop Item (Paper)
ID Code:7995
Status:Published
Uncontrolled Keywords:Bio-optical indicators, algal blooms, HAB, Alexandrium, phytoplankton dynamics, Mediterranean Sea
Subjects:Area 05 - Scienze biologiche > BIO/07 Ecologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:Millpress
ISBN:978-90-5966-042-7
Deposited On:03 Oct 2012 16:11

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