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3 results for “acoustic transmitters”
Data from: Innovative microphone transmitter reveals differences in acoustic structure between broadcast and whisper songs of Myadestes obscurus (ʻŌmaʻo)
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Data from: Evaluation of an acoustic telemetry transmitter designed to identify predation events
The field of acoustic telemetry has evolved rapidly and now permits the remote sensing of animal behaviour, movement, physiology and survival in environments and species not previously possible. However, an inability to detect when a telemetered animal is consumed by a predator can complicate accurate interpretation of telemetry data. Here, we describe efforts to test two generations of a novel prototype acoustic telemetry transmitter designed specifically to detect predation. Testing involved either staged predation events where tagged prey (Rainbow Trout Oncorhynchus mykiss and Yellow Perch Perca flavescens) were fed to captive Largemouth Bass Micropterus salmoides, or false positive testing where prey fish were tagged and held without risk of predation. Metrics of interest were (a) the rate of correctly identifying predation events, (b) signal lag (i.e. the time required to detect a predation event), (c) tag retention time in the predator's gut, and (d) the rate of false positive triggering in both live and dead prey fishes. Staged predation events were successfully identified in 61/65 and 52/55 trials for generation 1 and 2 tags, respectively. Signal lag time was reduced in generation 1 tags (generally between 1 - 9 hours) relative to generation 2 (3 - 29 hours); although signal lag was highly variable. A generalized linear mixed model indicated strong evidence that signal lag and tag retention were both negatively correlated with water temperature, but were not affected by prey species and only slightly by individual predator traits. There was preliminary evidence that prey size may be an important determinant of both signal lag and tag retention. False positives in live fish were absent after 120 days for generation 1 tags (n=31), however rates were significantly higher (10/44) after only 66 days for generation 2 tags. False positives in dead fish suggested that 20% of generation 2 predation tags would falsely trigger 2-3 days post-mortem. Testing of the novel predation tags was encouraging however further testing is recommended. Predation tags will be an important contribution to the field of acoustic telemetry; permitting improved data interpretation and less subjective estimates of predation rates in biotelemetry studies.
Data from: Evaluation of an acoustic telemetry transmitter designed to identify predation events
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