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Using passive acoustics for monitoring seagrass beds

P. Felisberto, O. Rodriguez , P. Santos, F. Zabel(*) and S.M.Jesus
LARSyS, University of Algarve, 8005-139 Faro, Portugal
(*) Marsensing, Campus de Gambelas, 8005-139, Faro (Portugal).

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Ref.: OCEANS MTS/IEEE, Monterey (USA), September 2016

Abstract: This paper discusses the ambient noise acquired during the period of one week, from May 8 to 15, 2013 over a Posidonia oceanica bed in the Bay of la Revellata, Calvi, Corsica. The acoustic receivers were moored at 3 locations with water depth ranging from 2 to 20 m. Simultaneously with acoustic measurements, the dissolved O2 was measured by an array of optodes. Preliminary results have shown that the noise power measured at various locations in the meadow is highly correlated with dissolved O2 (measured by other methods). Nevertheless, a close inspection of noise waveforms shows impulsive signals with shape similar to those produced by snapping shrimp and other shelled creatures. This work discusses the challenges faced on using these noise waveforms as ecosystem indicators and particularly to monitor the photosynthetic activity. .

ACKNOWLEDGMENT: This work was partially funded by National Funds through FCT- Foundation for Science and Technology under project SENSOCEAN (PTDC/EEA-ELC/104561/2008) and is now being pursued under project SEAOX funded by FCT under contract PTDC/EEI-PRO/2598/2014.

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