Abnormally high acoustic sea-floor backscatter patterns in active methane venting areas, Dnepr paleo-delta, northwestern Black Sea

(1) Renard Centre o f Marine Geology (RCMG), Universiteit Gent, Krijgslaan 281 s8, B-9000 Gent, Belgium, (Lieven.Naudts@UGent.be), (2) Leibniz-Institut für Meereswissenschaften, Wischhofstrasse 1-3, 24148 Kiel, Germany, (3) A.O. Kovalevsky Institute of Biology o f the Southern Seas NAS of Ukraine, Pr. Nakhimov 2, 99011 Sevastopol, Ukraine, (4) Department of Earth Sciences, Rome University La Sapienza, Piazalle Aldo Moro 5, 1-00185 Roma, Italy, (5) Max-Planck-Institut für Marine Mikrobiologie, Celsiusstrasse 1, D-28359 Bremen, Germany