Response of humpback whales (Megaptera novaeangliae) to ramp-up of a small experimental air gun array
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© 2016 Elsevier Ltd. 'Ramp-up', or 'soft start', is a mitigation measure used in seismic surveys and involves increasing the radiated sound level over 20-40. min. This study compared the behavioural response in migrating humpback whales to the first stages of ramp-up with the response to a 'constant' source, 'controls' (in which the array was towed but not operated) with groups in the absence of the source vessel used as the 'baseline'. Although the behavioural response, in most groups, resulted in an increase in distance from the source (potential avoidance), there was no evidence that either 'ramp-up' or the constant source at a higher level was superior for triggering whales to move away from the source vessel. 'Control' groups also responded suggesting the presence of the source vessel had some effect. However, the majority of groups appeared to avoid the source vessel at distances greater than the radius of most mitigation zones.
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Cato, Douglas; Noad, Michael; Dunlop, Rebecca; McCauley, Robert; Gales, Nick; Salgado-Kent, Chandra; Kniest, Hendrik; Paton, David; Jenner, Curt; Noad, John; Maggi, Amos; Parnum, Iain; Duncan, Alexander (2012)BRAHSS is a major project aimed at understanding how humpback whales respond to noise, particularly from seismic air gun arrays. It also aims to infer the longer term biological significance of the responses from the ...
Cato, D.; Noad, M.; Dunlop, R.; McCauley, Robert; Kniest, H.; Paton, D.; Salgado Kent, Chandra; Jenner, C. (2013)A study of the response of humpback whales to seismic air guns is being conducted in Australian waters and two of four major experiments have been completed. It aims to assess the impact of seismic surveys on the whales ...
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