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MEPS prepress abstract   -  DOI: https://doi.org/10.3354/meps13373

Sound characterization and fine-scale spatial mapping of an estuarine soundscape in the southeastern USA

Claire Mueller, Agnieszka Monczak, Jamileh Soueidan, Bradshaw McKinney, Somers Smott, Tony Mills, Yiming Ji, Eric W. Montie*

*Corresponding author:

ABSTRACT: Estuaries are areas known for biological diversity, and their soundscapes reflect the acoustic signals used by organisms to communicate, defend territories, reproduce, and forage in an environment that has limited visibility. These biological sounds may be rhythmic in nature, spatially heterogeneous, and could provide information on habitat quality. The goal of our study was to investigate the temporal and spatial variability of sounds in Chechessee Creek (stations CC1 and CC2) and an adjacent saltwater impoundment (Great Salt Pond or GSP) in South Carolina, USA, from April to November 2016. Fixed recording platforms revealed that sound pressure levels (SPLs) were significantly higher in CC1 and CC2 compared to GSP. We detected some biological sounds in GSP (i.e. snapping shrimp genus Alpheus and Synalpheus, silver perch Bairdiella chrysoura, oyster toadfish Opsanus tau, spotted seatrout Cynoscion nebulosus, Atlantic croaker Micropogonias undulatus, and American alligator Alligator mississippiensis); however, biological sound was much more prevalent in CC1 and CC2. In Chechessee Creek, snapping shrimp, oyster toadfish and spotted seatrout sounds followed distinct temporal rhythms. Using these data, we conducted spatial passive acoustic surveys in Chechessee Creek. We discovered elevated high frequency SPLs (i.e. representing snapping shrimp acoustic activity) near an anti-erosion wall, as well as increased low frequency SPLs (i.e. indicating spotted seatrout spawning aggregations) near the anti-erosion wall and at the mouth of Chechessee Creek. In this study, we demonstrated the utility of combining stationary and mobile recording platforms to detect acoustic hotspots of biological sounds.