ABSTRACTS OF POSTERS –HUMAN INTERACTIONS
hU 03 harbour porpoises do not react to high levels of shipping noise in the Great Belt, denmark
Jakob Tougaard (1), Lars Mortensen (1), Jonas Teilmann (1) (1) Aarhus University, Department of Bioscience, DK-4000 Roskilde, Denmark
jat@dmu.dk
The last decade has seen a rapid increase in the interest in ambient underwater noise and the possible negative effects on marine life by the increased anthropogenic contribution to the noise. While there is ample evidence that cetaceans, such as harbour porpoises, react negatively towards many types of sound sources (pingers, seal scarers, pile driving, outboard motors, etc) there is limited information on reactions towards noise from large ships. This is despite the fact that ship noise is among the most significant man made sources of acoustic energy in the ocean.
The Great Belt, Denmark is one of the areas where harbour porpoises are most abundant and at the same time among the world's busiest waterways with more than 40.000 ships above 300 tons passing every year. Noise loggers (DSG-loggers, Loggerheadinstruments, Florida) and porpoise dataloggers (T-PODs) were deployed in and next to shipping lanes as part of the EU Interreg study BaltSeaPlan.
Recordings were analysed in 1/3-octave bands and compared with T-POD detections of porpoises, whenever possible. No clear (negative) correlation between noise levels and porpoises could be found in the data, indicating little or no reaction of porpoises to individual passing ships, at least at distances of some hundred meters from the ships. Highest received broadband levels of noise were in the range of 130-150 dB re. 1 uPa rms and thus consistent with studies on other sound sources which have found reaction thresholds above this level.
The results have implications for the implementation of the EU Marine Strategy Framework Directive, which operates with universal indicators for ship noise at 63 and 125 Hz. At least for harbour porpoises, these indicators may not adequately reflect actual impact on the animals and other types of boat traffic with higher pitched noise may be more relevant to monitor.
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