12/18/2023 0 Comments Dolphin sounds from dolphin tale![]() ![]() Southall, B.L., Bowles, A.E., Ellison, W.T., Finneran, J.J., Gentry, R.L., Greene Jr., C.R., Kastak, D., Ketten, D.R., Miller, J.H., Nachtigall, P.E., Richardson, W.J., Thomas, J.A., Tyack, P.L.: Marine mammal noise exposure criteria: initial scientific recommendation. 86, 29–38 (2014)Įrbe, C., Reichmuth, C., Cunningham, K., Lucke, K., Dooling, R.: Communication masking in marine mammals: a review and research strategy. Williams, R., Ashe, E., Blight, L., Jasny, M., Nowlan, L.: Marine mammals and ocean noise: future directions and information needs with respect to science, policy and law in Canada. Williams, R., Wright, A.J., Ashe, E., Blight, L.K., Bruintjes, R., Canessa, R., Clark, C.W., Cullis-Suzuki, S., Dakin, D.T., Erbe, C., Hammond, P.S., Merchant, N.D., O’Hara, P.D., Purser, J., Radford, A.N., Simpson, S.D., Thomas, L., Wale, M.A.: Impacts of anthropogenic noise on marine life: publication patterns, new discoveries, and future directions in research and management. Weilgart, L.S.: The impacts of anthropogenic ocean noise on cetaceans and implications for management. Richardson, W.J., Greene, C.R., Malme, C.I., Thomson, D.H.: Marine Mammals and Noise. National Academies Press, Washington (2003) National Research Council, N.R.C.: Ocean Noise and Marine Mammals. National Academies Press, Washington (2005) ![]() National Research Council, N.R.C.: Marine Mammal Populations and Ocean Noise. Nowacek, D.P., Thorne, L.H., Johnston, D.W., Tyack, P.L.: Responses of cetaceans to anthropogenic noise. In: Marine Mammal Biology: An evolutionary approach. Tyack, P.L., Miller, E.H.: Vocal anatomy, acoustic communication and echolocation. If noise levels were to increase in Roebuck Bay, coastal dolphins may show behavioural and/or acoustical responses as observed at other locations. Dolphin communications had a greater potential to be masked in Fremantle Inner Harbour than in Roebuck Bay based on elevated anthropogenic noise levels. On average, Roebuck Bay was 20 dB quieter than the Fremantle Inner Harbour over the frequency band 10 Hz–11 kHz. However, in Fremantle Inner Harbour, anthropogenic noise was prevalent. ![]() In Roebuck Bay, the local soundscape was dominated by biotic sounds, with only sporadic vessel noise. Results indicated that the two sites had highly contrasting acoustic environments. Acoustic data were assessed via weekly spectrograms, power spectrum density percentile plots and probability densities, octave band levels, broadband noise levels, and generalised estimating equations. Additionally, in Roebuck Bay opportunistic in situ recordings with concurrent visual observations were collected in the presence of two dolphin species. Autonomous underwater acoustic recorders collected approximately 9 h of data from these two sites, respectively. This study aimed to compare the acoustic environment of coastal dolphins in two locations within Western Australia by comparing a ‘pristine’ habitat (Roebuck Bay) with an ‘urban’ habitat (Fremantle Inner Harbour). This is particularly true for managers of acoustically specialised species. Although the overall aim of regulation is to quieten anthropogenically noise-rich habitats whilst maintaining pristine habitats free of man-made noise, effective management plans require knowledge upon which to base decisions. Underwater noise environments are increasingly being considered in marine spatial planning and habitat quality assessments. ![]()
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