La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Feedback Mechanisms Between Cyanobacterial Blooms, Transient Hypoxia, and Benthic Phosphorus Regeneration in Shallow Coastal Environments
Auteurs :	Mindaugas Zilius, Auteur ; Marco Bartoli, Auteur ; Mariano Bresciani, Auteur ; Marija Katarzyte, Auteur ; Tomas Ruginis, Auteur ; Jolita Petkuviene, Auteur ; Irma Lubiene, Auteur ; Claudia Giardino, Auteur ; Paul A. Bukaveckas, Auteur ; Rutger de Wit, Auteur ; Arturas Razinkovas-Baziukas, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (37(3) MAY 2014)
Article en page(s) :	680-694
Résumé :	We investigated the dissolved oxygen metabolism of the Curonian Lagoon (Baltic Sea) to assess the relative contributions of pelagic and benthic processes to the development of transient hypoxic conditions in shallow water habitats. Metabolism measurements along with the remote sensing-derived estimates of spatial variability in chlorophyll a were used to evaluate the risk of hypoxia at the whole lagoon level. Our data demonstrate that cyanobacterial blooms strongly inhibit light penetration, resulting in net heterotrophic conditions in which pelagic oxygen demand exceeds benthic oxygen demand by an order of magnitude. The combination of bloom conditions and reduced vertical mixing during calm periods resulted in oxygen depletion of bottom waters and greater sediment nutrient release. The peak of reactive P regeneration (nearly

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...