Effectiveness of passive acoustic telemetry on coral reefs depends on deployment strategy and benthic substrate characteristics
(English)Manuscript (preprint) (Other academic)
Acoustic telemetry can be an effective technology for investigating movement and behaviour ofaquatic species. While some scientific studies have evaluated the performance of acoustic receivers infreshwater and estuarine habitats, few studies have been carried out in coastal coral reef environments.This study investigated the effects of receiver deployment strategy and abiotic and biotic factors(benthic habitat characteristics, background noise, and depth) on detection rates and detection range incoral reef habitats. These effects were examined using stationary acoustic transmitters deployed in thewater column or surgically inserted in free-swimming fish of two species of herbivorous rabbitfish(Siganidae). Deployment strategy had the largest effect on detection rates and detection range withinthe acoustic array. Acoustic receivers deployed high in the water column were far more efficient thanthose deployed close to the bottom, with approximately 45% more detections registered andsignificantly increased detection ranges. This was consistent with the results from tagged rabbitfish, asacoustic receivers deployed high in the water column recorded more than twice as many detections than receivers deployed close to the bottom for fish displaying natural behaviour. Benthic substrate interms of hard substrate, rubble, and sand had an impact on detection rates and there was a clear dielpattern in detection rates between day and night. To conclude, deployment strategy and habitat characteristics have a large impact on detection rates and detection ranges in passive acoustic arrays incoral reef habitats. This finding emphasises the importance of using permanent transmitters as controlsto evaluate effectiveness of acoustic receivers throughout acoustic telemetry studies.
Research subject Marine Ecotoxicology
IdentifiersURN: urn:nbn:se:su:diva-125594OAI: oai:DiVA.org:su-125594DiVA: diva2:894218