The influence of environmental parameters on the performance and detection range of acoustic receivers

Huveneers, Charlie, Simpfendorfer, Colin A., Kim, Susan, Semmens, Jayson M., Hobday, Alistair J., Pederson, Hugh, Stieglitz, Thomas, Vallee, Richard, Webber, Dale, Heupel, Michelle R., Peddemors, Vic, and Harcourt, Robert G. (2016) The influence of environmental parameters on the performance and detection range of acoustic receivers. Methods in Ecology and Evolution, 7 (7). pp. 825-835.

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Abstract

Acoustic telemetry is being increasingly used to study the ecology of many aquatic organisms. This widespread use has been advanced by national and international tracking programs that coordinate deployment of passive acoustic telemetry networks on a regional and continental scale to detect tagged animals. While it is well-known that environmental conditions can affect the performance of acoustic receivers, these effects are rarely quantified despite the profound implications for tag detection and hence the ecological inferences. Here, we deployed eight receivers at different depths within the water column and at different orientations (hydrophone up or down) and 12 tags 200-800m from the receivers for 234 days to investigate how the tag detection range of acoustic receivers varied through time and under different meteorologic and oceanographic conditions. The study showed that receiver depth and orientation, and time since deployment had the largest effect on the detection range. Thermocline gradient and depth, and wind speed were the environmental factors most affecting detection range, while wind direction, precipitation and atmospheric pressure had negligible or no effect. Comparison of results to a proposed general acoustic theory model and previous studies showed that findings from specific habitat types cannot be generalised and applied across other habitats or environments. A good understanding of the acoustic coverage and temporal variations in relation to environmental conditions are crucial to accurate interpretation of results, and ensuing management recommendations. We recommend that each study include stationary reference tags to measure changes in detection probability with time, help refine detection range, and be used to improve confidence in the reporting and interpretation of the data.

Item ID: 45502
Item Type: Article (Research - C1)
ISSN: 2041-210X
Keywords: AATAMS - IMOS, acoustic telemetry, detection probability, detection range, sentinel tags
Date Deposited: 24 Aug 2016 10:51
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 100%
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