| Autor: |
Pine, MK, Radford, CA, Jeffs, AG |
| Předmět: |
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| Zdroj: |
New Zealand Journal of Marine & Freshwater Research; Jun2015, Vol. 49 Issue 2, p247-258, 12p |
| Abstrakt: |
With considerable commercial interest in renewable energy production in estuarine environments, there is a critical need to better understand ambient sound from these habitats. This study investigated the ambient sound from two sites of differing habitats within the Kaipara Harbour, a site previously allocated for tidal turbine development. Analyses revealed highest sound levels occurring in autumn (120 ± 0.6 dBrmsre 1 µPa) and summer (117 ± 0.6 dBrmsre 1 µPa) within the seagrass-dominated and mudflat sites respectively. There was significant temporal variation over a 24 h period in measured sound levels both between and within the two estuarine sites, with higher sound levels generally occurring at dawn within either site. Spectral analysis revealed a rise in spectral power in the 2–4 kHz and 6–9 kHz bandwidths during dawn and dusk periods within the seagrass-dominated and mudflat sites respectively. With most acoustic energy residing in low frequencies, underwater turbine sound may mask estuarine soundscapes, thereby potentially disrupting important ecological processes. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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