When employing acoustic telemetry to study aquatic species, understanding the functional dynamics of the monitoring system is essential for effective study design, data interpretation, and analysis. Typically, researchers are concerned with maximum effective detection range and consequently tend to employ the largest most powerful tags the study species can carry without considerable energetic burden. In ideal acoustic conditions of low ambient noise environments, low attenuation, and reflective structure, higher powered tags can be detected at larger distances from the receiver, but they can also be subject to the phenomenon ‘Close Proximity Detection Interference’ (CPDI). This occurs when reflective barriers, such as a calm water surface and/or hard substrate, result in strong transmission echoes that interfere with the transmission sequence. As a result, transmissions in close proximity to the receiver are not effectively decoded and logged.
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Kessel, Steven Thomas; Hussey, Nigel Edward; Webber, Dale Mitchell; Gruber, Samuel Harvey; Young, Joy Michelle; Smale, Malcolm John; and Fisk, Aaron T.. (2015). Close proximity detection interference with acoustic telemetry: The importance of considering tag power output in low ambient noise environments. Animal Biotelemetry, 3.