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Journal articles on the topic 'Acoustic deterrents'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Putland, R. L., and A. F. Mensinger. "Acoustic deterrents to manage fish populations." Reviews in Fish Biology and Fisheries 29, no. 4 (October 28, 2019): 789–807. http://dx.doi.org/10.1007/s11160-019-09583-x.

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2

Penny, Samuel G., Rachel L. White, Dawn M. Scott, Lynne MacTavish, and Angelo P. Pernetta. "Using drones and sirens to elicit avoidance behaviour in white rhinoceros as an anti-poaching tactic." Proceedings of the Royal Society B: Biological Sciences 286, no. 1907 (July 17, 2019): 20191135. http://dx.doi.org/10.1098/rspb.2019.1135.

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Poaching fuelled by international trade in horn caused the deaths of over 1000 African rhinoceros ( Ceratotherium simum and Diceros bicornis ) per year between 2013 and 2017. Deterrents, which act to establish avoidance behaviours in animals, have the potential to aid anti-poaching efforts by moving at-risk rhinos away from areas of danger (e.g. near perimeter fences). To evaluate the efficacy of deterrents, we exposed a population of southern white rhinos ( C. simum simum ) to acoustic- (honeybee, siren, turtle dove), olfactory- (chilli, sunflower), and drone-based stimuli on a game reserve in South Africa. We exposed rhinos to each stimulus up to four times. Stimuli were considered effective deterrents if they repeatedly elicited avoidance behaviour (locomotion away from the deterrent). Rhinos travelled significantly further in response to the siren than to the honeybee or turtle dove stimulus, and to low-altitude drone flights than to higher altitude flights. We found the drone to be superior at manipulating rhino movement than the siren owing to its longer transmission range and capability of pursuit. By contrast, the scent stimuli were ineffective at inciting avoidance behaviour. Our findings indicate that deterrents are a prospective low-cost and in situ method to manage rhino movement in game reserves.

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3

Ramp, Daniel, Clio Gates Foale, Erin Roger, and David B. Croft. "Suitability of acoustics as non-lethal deterrents for macropodids: the influence of origin, delivery and anti-predator behaviour." Wildlife Research 38, no. 5 (2011): 408. http://dx.doi.org/10.1071/wr11093.

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Context Auditory devices used to deter wildlife are a potentially humane and effective way of minimising deleterious interactions with humans and their livelihoods and have been used successfully for many species around the world. Acoustic cues can be used to manipulate anti-predator behaviour, encouraging animals to forage elsewhere. Employing acoustics derived from natural sources to make use of innate behavioural responses has been suggested to outperform novel or artificial sounds; however, anti-predator strategies vary among sympatric species and will influence the utility of acoustic stimuli for deterring wildlife. Aims We aimed to test the interaction between the source of origin (natural or novel) and species traits (anti-predator strategy – grouping behaviour) on the efficacy of using acoustic stimuli to elicit alarm responses for two species in the family Macropodidae commonly associated with browsing on forest plantation seedlings; the red-necked pademelon (Thylogale thetis) and the red-necked wallaby (Macropus rufogriseus banksianus). Methods We tested these factors in captivity using playback experiments of acoustic stimuli and monitored the behavioural responses of subjects. Results Red-necked pademelons exhibited strong responses to bioacoustic and novel stimuli but did not greatly differentiate among them. Short-term habituation to predator calls was detected whereas responsiveness to novel sounds increased. Red-necked wallabies most strongly responded to conspecific distress calls, showing no sign of short-term habituation. Conclusions Results from the present and other studies suggest that bioacoustic deterrents, particularly those utilising natural conspecific sounds, aimed at communicating danger, have the potential to play an important role in non-lethal wildlife management, although that responsiveness varies with the form of anti-predator strategies employed. Implications If alarm responses translate into subjects vacating targeted areas, then there is some potential to implement non-lethal acoustic deterrents for macropodids alongside other management measures aimed at preventing impacts on primary production. Problematically, our experiments showed that without accurate acoustic delivery, particularly of sounds with infrasonic components, the development of effective bioacoustic deterrents may remain stymied.

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Santana-Garcon, Julia, Corey B. Wakefield, Stacey R. Dorman, Ainslie Denham, Stuart Blight, Brett W. Molony, and Stephen J. Newman. "Risk versus reward: interactions, depredation rates, and bycatch mitigation of dolphins in demersal fish trawls." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 12 (December 2018): 2233–40. http://dx.doi.org/10.1139/cjfas-2017-0203.

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An improved understanding of interaction dynamics between dolphins and trawlers is essential for improving bycatch mitigation strategies. In-situ observations using video at increasing distances from the net opening during 50 commercial fish trawls, recorded 5908 common bottlenose dolphin (Tursiops truncatus (Montagu, 1821)) interactions and provided details on their duration, depredation rates, and behaviours. Dolphin interactions with trawls were very common (98% of day-trawls, 118 ± 16 interactions per trawl), with durations and prey consumption positively correlated with the distances ventured into the net. Acoustic deterrents (pingers) had no effect on interaction numbers or durations. Based on in-situ observations, the factors that contribute toward dolphin bycatch in demersal fish trawls were likely associated with (i) risky dolphin behaviour (i.e., entering net during hauling, residing deep within trawl for extended periods or social aggression) and (or) (ii) instability of fishing gear resulting in entrapment. Given the high level of dolphin attendance during most day-trawls, mitigation strategies that focus on improving and monitoring the stability of trawl gear would be more effective than current acoustic deterrent devices aimed at modifying dolphin behaviour.

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BROWN, KENNETH M., GARY W. PETERSON, GERALD J. GEORGE, and MICHAEL MCDONOUGH. "ACOUSTIC DETERRENTS DO NOT REDUCE BLACK DRUM PREDATION ON OYSTERS." Journal of Shellfish Research 25, no. 2 (August 2006): 537–41. http://dx.doi.org/10.2983/0730-8000(2006)25[537:addnrb]2.0.co;2.

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6

Weaver, Sara P., Cris D. Hein, Thomas R. Simpson, Jonah W. Evans, and Ivan Castro-Arellano. "Ultrasonic acoustic deterrents significantly reduce bat fatalities at wind turbines." Global Ecology and Conservation 24 (December 2020): e01099. http://dx.doi.org/10.1016/j.gecco.2020.e01099.

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7

Thady, Robin G., Lauren C. Emerson, and John P. Swaddle. "Evaluating acoustic signals to reduce avian collision risk." PeerJ 10 (May 10, 2022): e13313. http://dx.doi.org/10.7717/peerj.13313.

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Collisions with human-made structures are responsible for billions of bird deaths each year, resulting in ecological damage as well as regulatory and financial burdens to many industries. Acoustic signals can alert birds to obstacles in their flight paths in order to mitigate collisions, but these signals should be tailored to the sensory ecology of birds in flight as the effectiveness of various acoustic signals potentially depends on the influence of background noise and the relative ability of various sound types to propagate within a landscape. We measured changes in flight behaviors from zebra finches released into a flight corridor containing a physical obstacle, either in no-additional-sound control conditions or when exposed to one of four acoustic signals. We selected signals to test two frequency ranges (4–6 kHz or 6–8 kHz) and two temporal modulation patterns (broadband or frequency-modulated oscillating) to determine whether any particular combination of sound attributes elicited the strongest collision avoidance behaviors. We found that, relative to control flights, all sound treatments caused birds to maintain a greater distance from hazards and to adjust their flight trajectories before coming close to obstacles. There were no statistical differences among different sound treatments, but consistent trends within the data suggest that the 4–6 kHz frequency-modulated oscillating signal elicited the strongest avoidance behaviors. We conclude that a variety of acoustic signals can be effective as avian collision deterrents, at least in the context in which we tested these birds. These results may be most directly applicable in scenarios when birds are at risk of collisions with solid structures, such as wind turbines and communication towers, as opposed to window collisions or collisions involving artificial lighting. We recommend the incorporation of acoustic signals into multimodal collision deterrents and demonstrate the value of using behavioral data to assess collision risk.

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Racca, Roberto G. "Testing acoustic fish deterrents for use under‐ice in arctic lakes." Journal of the Acoustical Society of America 117, no. 4 (April 2005): 2553–54. http://dx.doi.org/10.1121/1.4788496.

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9

Kraus, Scott O. "The Once and Future Ping: Challenges for the Use of Acoustic Deterrents in Fisheries." Marine Technology Society Journal 33, no. 2 (January 1, 1999): 90–93. http://dx.doi.org/10.4031/mtsj.33.2.15.

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Turney, Dominique D., Andrea K. Fritts, Brent C. Knights, Jon M. Vallazza, Douglas S. Appel, and James T. Lamer. "Hydrological and lock operation conditions associated with paddlefish and bigheaded carp dam passage on a large and small scale in the Upper Mississippi River (Pools 14–18)." PeerJ 10 (August 2, 2022): e13822. http://dx.doi.org/10.7717/peerj.13822.

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Movement and dispersal of migratory fish species is an important life-history characteristics that can be impeded by navigation dams. Although habitat fragmentation may be detrimental to native fish species, it might act as an effective and economical barrier for controlling the spread of invasive species in riverine systems. Various technologies have been proposed as potential fish deterrents at locks and dams to reduce bigheaded carp (i.e., silver carp and bighead carp (Hypophthalmichthys spp.)) range expansion in the Upper Mississippi River (UMR). Lock and Dam (LD) 15 is infrequently at open-river condition (spillway gates completely open; hydraulic head across the dam <0.4 m) and has been identified as a potential location for fish deterrent implementation. We used acoustic telemetry to evaluate paddlefish passage at UMR dams and to evaluate seasonal and diel movement of paddlefish and bigheaded carp relative to environmental conditions and lock operations at LD 15. We observed successful paddlefish passage at all dams, with the highest number of passages occurring at LDs 17 and 16. Paddlefish residency events in the downstream lock approach of LD 15 occurred more frequently and for longer durations than residency events of bigheaded carp. We documented upstream passages completed by two individual paddlefish through the lock chamber at LD 15, and a single bighead carp completed upstream passage through the lock chamber during two separate years of this study. We identified four bigheaded carp and 19 paddlefish that made upstream passages through the spillway gates at LD 15 during this study. The majority of the upstream passages through the spillway gates for both species occurred during open river conditions. When hydraulic head was approximately 1-m or greater, we observed these taxa opt for upstream passage through the lock chamber more often than the dam gates. In years with infrequent open-river condition, a deterrent placed in the downstream lock approach may assist in meeting the management goal of reducing upstream passage of bigheaded carps but could also potentially affect paddlefish residency and passage. Continued study to understand the effects of deterrents on native fish could be beneficial for implementing an integrated bigheaded carp control strategy. Understanding fish behavior at UMR dams is a critical information need for river managers as they evaluate potential tools or technologies to control upstream expansion of bigheaded carp in the UMR.

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Nakamura, Koji, Tomonari Akamatsu, A. David Goodson, Kenji Kagoshima, and Kenji Shimazaki. "Gillnet Passive Acoustic Deterrents: Investigating Inter-Reflector Spacings with a Harbor Porpoise Phocoena phocoena." Fisheries science 64, no. 4 (1998): 648–49. http://dx.doi.org/10.2331/fishsci.64.648.

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You, Hojung, and Rafael O. Tinoco. "Quantifying the Response of Grass Carp Larvae to Acoustic Stimuli Using Particle-Tracking Velocimetry." Water 13, no. 5 (February 25, 2021): 603. http://dx.doi.org/10.3390/w13050603.

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Acoustic deterrents are recognized as a promising method to prevent the spread of invasive grass carp, Ctenopharyngodon idella (Valenciennes, 1844) and the negative ecological impacts caused by them. As the efficacy of sound barriers depends on the hearing capabilities of carp, it is important to identify whether carps can recognize acoustic signals and alter their swimming behavior. Our study focuses on quantifying the response of grass carp larvae when exposed to out-of-water acoustic signals within the range of 100–1000 Hz, by capturing their movement using particle-tracking velocimetry (PTV), a quantitative imaging tool often used for hydrodynamic studies. The number of responsive larvae is counted to compute response ratio at each frequency, to quantify the influence of sound on larval behavior. While the highest response occurred at 700 Hz, we did not observe any clear functional relation between frequency of sound and response ratio. Overall, 20–30% of larvae were consistently reacting to sound stimuli regardless of the frequency. In this study, we emphasize that larval behaviors when exposed to acoustic signals vary by individual, and thus a sufficient number of larvae should be surveyed at the same time under identical conditions, to better quantify their sensitivity to sound rather than repeating the experiment with individual specimens. Since bulk quantification, such as mean or quantile velocities of multiple specimens, can misrepresent larval behavior, our study finds that including the response ratio can more effectively reflect the larval response.

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Thode, Aaron, Delphine Mathias, Janice Straley, Victoria O'Connell, Linda Behnken, Dan Falvey, Lauren Wild, et al. "Cues, creaks, and decoys: using passive acoustic monitoring as a tool for studying sperm whale depredation." ICES Journal of Marine Science 72, no. 5 (March 21, 2015): 1621–36. http://dx.doi.org/10.1093/icesjms/fsv024.

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Abstract Since 2003, a collaborative effort (SEASWAP) between fishers, scientists, and managers has researched how Alaskan sperm whales locate demersal longline fishing activity and then depredate sablefish from gear. Sperm whales constantly produce relatively low-frequency biosonar signals whenever foraging; therefore, over the past decade, passive acoustic monitoring (PAM) has become a basic tool, used for both measuring depredation activity and accelerating field tests of potential depredation countermeasures. This paper reviews and summarizes past published PAM research on SEASWAP, and then provides a detailed example of how PAM methods are currently being used to test countermeasures. The review covers two major research thrusts: (i) identifying acoustic outputs of fishing vessels that provide long-distance “cues” that attract whales to fishing activity; and (ii) validating whether distinctive “creak” sounds can be used to quantify and measure depredation rates, using both bioacoustic tags and statistical comparisons between visual and acoustic depredation estimates during federal sablefish surveys. The latter part of the paper then provides an example of how PAM is being used to study a particular potential countermeasure: an “acoustic decoy” which transmits fishing vessel acoustic cues to attract animals away from true fishing activity. The results of an initial 2011 field trial are presented to show how PAM was used to design the decoy signals and monitor the efficacy of the deployment. The ability of PAM to detect both whale presence and depredation behaviour has reduced the need to deploy researchers or other specialists on fishing cruises. Instead, volunteer fishers can deploy “user-friendly” acoustic recorders on their gear, greatly facilitating the testing of various deterrents, and providing the industry and regulators a convenient and unobtrusive tool for monitoring both the scale and long-term spread of this behaviour across the Alaskan fishery.

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Cukor, Jan, František Havránek, Zdeněk Vacek, Karel Bukovjan, Vilém Podrázský, and Ram P. Sharma. "Roe deer (Capreolus capreolus) mortality in relation to fodder harvest in agricultural landscape." Mammalia 83, no. 5 (August 27, 2019): 461–69. http://dx.doi.org/10.1515/mammalia-2018-0002.

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Abstract In the agricultural landscape, thousands of animals are killed yearly as a result of agricultural machinery innovation, mostly because of a higher harvesting speed and wider cutting bars. Harvesting machines besides predation by red fox (Vulpes vulpes L.) on roe deer (Capreolus capreolus L.) in the intensively managed cultural landscape are the most crucial factor in fawn mortality. This article offers an evaluation of the mostly used preventive methods, which aim to drive roe deer does along with their fawns out of fodder meadows prepared for harvest in the Czech Republic. Evaluation of efficiency and effectiveness of the different methods was made based on the questionnaire survey published in a professional hunting journal. The assessment of responses from a survey was followed by a field-based investigation conducted before fodder harvesting. The devices studied for efficiency were acoustic, optical and scent deterrents in comparison to the traditional search method combined with volunteers and hunting dogs. The results show differences in the number of fawns saved per hectare. A significant difference was found only between the optical deterrent method (0.4 fawns saved per hectare) and traditional search method (0.09 fawns saved per hectare). This study found no substantial difference among various deterring devices in terms of their effectiveness in reducing the mortality of roe deer fawns. Thus, it is important to explore the innovative methods in the future that can work most effectively for saving not only deer fawns, but also other game animals in the cultural landscape.

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Cruz, Maria João, Vera Leal Jordão, João Gil Pereira, Ricardo Serrão Santos, and Mónica A. Silva. "Risso's dolphin depredation in the Azorean hand-jig squid fishery: assessing the impacts and evaluating effectiveness of acoustic deterrents." ICES Journal of Marine Science 71, no. 9 (June 2, 2014): 2608–20. http://dx.doi.org/10.1093/icesjms/fsu073.

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Abstract Depredation by cetaceans is a growing problem that may have serious economic implications for fisheries and for dolphin conservation. We investigated depredation by Risso's dolphin (Grampus griseus) in the hand-jig squid fishery around the Azores to determine the factors that may influence depredation behaviour and impacts on the fishery, and conducted experiments to evaluate the effectiveness of acoustic deterrent devices. Monitoring of the interaction between dolphins and the fishery was carried out through interviews with fishers and observations made from fishing vessels. Depredation was reported in 50% of the 506 interviews conducted from 2009 to 2011 and Risso's dolphins were reportedly responsible for 92% of the depredation events. Risso's dolphin depredation was recorded in 33% of the observed fishing trips (n = 96). Generalized additive models revealed that depth, sea surface temperature, and fishing time were important factors affecting depredation probability. Generalized linear models showed that fishing time also influenced the number of squids depredated, with greater catch losses predicted as duration of the fishing events increased. Depredation rate was calculated at 3% yielding an estimate of 8–12 t of squid lost to dolphins per year and an annual economic loss of €50 000 for the squid fishery of S. Miguel. The use of pingers had no significant effect on the catch per unit effort of squids. Depredation rates were similar for the control (0.20), inactive (0.19), and active (0.19) pinger conditions. Models indicated no significant effect of pinger brand and condition on cetacean depredation. This study is the first attempt to monitor depredation by Risso's dolphins on a hand-jig squid fishery providing a scientific basis for future management of interactions between cetaceans and fisheries.

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Aboltins, Arturs, Dmitrijs Pikulins, Juris Grizans, and Sergejs Tjukovs. "Piscivorous Bird Deterrent Device Based on a Direct Digital Synthesis of Acoustic Signals." Elektronika ir Elektrotechnika 27, no. 6 (December 14, 2021): 42–48. http://dx.doi.org/10.5755/j02.eie.28977.

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This paper addresses the development of an acoustic deterrent device for the protection of fishponds and other objects against the unwanted presence of birds. The objective of the paper is not only providing of a deep analysis of available technologies for waveform synthesis and generation, but also building a theoretical base for the design and implementation of acoustic bird deterrent solutions. The paper addresses the synthesis of bird songs and calls using technologies for music, speech, and other types of acoustic signal processing. The second part of the paper is devoted to the unique algorithms and implementation details of the intelligent acoustic deterrence device prototype. The practical applicability of algorithms for bird call record conversion into synthesizer sequences has been analysed and possible issues are highlighted. The effectiveness and ease of practical implementation of the given method in the hardware are briefly discussed.

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O’Connell-Rodwell, Caitlin E., Monica N. Sandri, Jodie L. Berezin, Jaquelyn M. Munevar, Colleen Kinzley, Jason D. Wood, Maggie Wiśniewska, and J. Werner Kilian. "Male African Elephant (Loxodonta africana) Behavioral Responses to Estrous Call Playbacks May Inform Conservation Management Tools." Animals 12, no. 9 (May 1, 2022): 1162. http://dx.doi.org/10.3390/ani12091162.

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Driven by reproductive motives, male African elephants (Loxodonta africana) in musth often expand their home ranges to locate estrous females. This extended range, coupled with heightened aggression often observed in musth males, can be particularly problematic in regions where human-modified landscapes and elephant territories increasingly overlap. Several mitigation tools have been tested to resolve a wide range of human–elephant conflicts with varying degrees of success due to geographical disparities and habituation. We present findings on the potential application of estrous call playbacks in manipulating the behavior and movement of male elephants non-invasively, particularly mature musth adults and younger post-dispersal males, in Etosha National Park. Estrous vocalizations were presented across 26 experimental trials to mature musth adults (n = 5), mature non-musth adults (n = 6), and non-musth males belonging to younger, post-dispersal age classes (n = 8), with behavioral responses scored on a gradient scale from 0–1. Both mature musth adults and younger non-musth elephants were significantly more likely to respond with the highest intensity by approaching the acoustic source compared to mature non-musth adults that avoided the call. However, younger males tested in the presence of an older, higher-ranking male tended to react with a lower intensity than those tested alone. This result likely demonstrates the influence of social hierarchy and associations on male elephant behavior. We also observed a significant increase in physiological response, measured by defecation rate, across all male groups in response to the estrous call playbacks. Our findings suggest that using estrous calls as acoustic deterrents may effectively and non-invasively aid in reducing tension at the human–elephant interface, depending on the age, social context, and reproductive status of the male elephant.

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Li Veli, Daniel, Andrea Petetta, Giulio Barone, Ilaria Ceciarini, Enrica Franchi, Letizia Marsili, Guido Pietroluongo, et al. "Fishers’ Perception on the Interaction between Dolphins and Fishing Activities in Italian and Croatian Waters." Diversity 15, no. 2 (January 18, 2023): 133. http://dx.doi.org/10.3390/d15020133.

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Interactions between fishing and dolphins can be detrimental, since on one hand dolphins can be lethally entangled by nets and trawls, and on the other dolphins can predate fish caught by nets. For dolphins, this interaction can be dangerous as they can be wounded or accidentally killed; for fishers, the predation of their catch results in economic losses due to reduced quantity and/or quality of catches and damage to fishing gear. During July and November 2020, we surveyed the “dolphin–fisheries conflict” through compiling 209 fisher interviews from nine locations in Italy and Croatia. Fishers mentioned the common bottlenose dolphin (Tursiops truncatus) as the species primarily interacting with fishing, with the major issue being catch damage by predation. The interaction probability varied among gears and seasons, with some fishing activities (e.g., passive nets) more affected than others (e.g., bottom trawls), especially in terms of economic loss (1000–10,000 €/year on average). More than 70% of the fishers claimed that dolphin populations have increased over the last 10 years, in different degrees and based on different areas. Dolphin bycatch rates are generally low; however, 34.6% of respondents reported having captured at least one dolphin during their career. The fishers’ attitude towards acoustic deterrents (“pingers”) as a mitigation measure revealed that few of them were aware of these devices or were using them.

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Hiley, HM, VM Janik, and T. Götz. "Behavioural reactions of harbour porpoises Phocoena phocoena to startle-eliciting stimuli: movement responses and practical applications." Marine Ecology Progress Series 672 (August 19, 2021): 223–41. http://dx.doi.org/10.3354/meps13757.

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Acoustic deterrent devices are frequently used as a mitigation method to exclude harbour porpoises Phocoena phocoena from areas of potential harm, such as wind farm construction sites. However, there is increasing evidence that the devices themselves have the capacity to cause hearing damage. Here, we investigated the response of harbour porpoises to a 15 min sequence of 200 ms sound (peak frequency 10.5 kHz, range 5.5-20.5 kHz, 27 sounds total), which elicits the acoustic startle reflex. We used a duty cycle (0.6%) and sound exposure level that were significantly lower than in conventional acoustic deterrent devices. Harbour porpoises were exposed to startle sounds from a small vessel, and groups were visually tracked during 13 sound exposure sequences and 11 no-sound control trials. Porpoises showed a significant avoidance reaction during exposure, travelling a mean distance of 1.78 km (max. 3.21 km). In all cases, they left the area within 1 km of the sound source in the first 15 min after the start of the startle sequence. No avoidance was exhibited during control trials. Results are consistent with the startle reflex mediating this behaviour at low response thresholds. Our method can be used for mitigating collision risk and the risk of hearing damage from renewable energy installations, their construction and the deterrence device itself.

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Namlıtürk, Emre. "Interaction between dolphins and coastal fisheries and using acoustic deterrent in reducing of interaction." Ege Journal of Fisheries and Aquatic Sciences 38, no. 1 (March 15, 2021): 43–52. http://dx.doi.org/10.12714/egejfas.38.1.05.

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This study was conducted at the Unye-Ordu coasts of the South-eastern Black Sea, from May 2015 and February 2017, to investigate the frequency of dolphins-bottom gillnet fisheries interactions, the role of using acoustic deterrent in reducing the damage inflicted by the dolphins to the gillnets and to the fish caught in the gillnets. For this purpose, two gillnet sets with similar technical and equipment characteristics were prepared. While one of the groups had acoustic deterrent (active group), the other did not have acoustic deterrent (control group). In the study were used Future Oceans (70 kHz) deterrent. During the study, in only 3 of the 65 fishing trials have determined the interaction of dolphins with gillnets. It was determined that the number of holes in the gillnets caused by the dolphins was 36.3% less in the nets with acoustic deterrent than the control nets. On the other hand, the CPUE value of the whiting was estimated as 2.01 ± 0.23 kg km-1 s-1 in the gillnets with acoustic deterrent and 1.97 ± 0.24 kg km-1 s-1 in the control nets. These results showed that the use of acoustic deterrent does not have a negative effect on the catch of whiting caught in the gillnets.

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Sutin, Alexander, and Yegor Sinelnikov. "Acoustic diver deterrent in a shallow harbor using time reversal acoustics." Journal of the Acoustical Society of America 130, no. 4 (October 2011): 2411. http://dx.doi.org/10.1121/1.3654663.

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Henderson, Shirley. "Acoustic deterrent protects porpoises." Marine Pollution Bulletin 32, no. 11 (November 1996): 764–65. http://dx.doi.org/10.1016/s0025-326x(96)80732-6.

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Knecht, Heather A., Peggy B. Nelson, Gail M. Whitelaw, and Lawrence L. Feth. "Background Noise Levels and Reverberation Times in Unoccupied Classrooms." American Journal of Audiology 11, no. 2 (December 2002): 65–71. http://dx.doi.org/10.1044/1059-0889(2002/009).

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Classrooms are often filled with deterrents that hamper a child’s ability to listen and learn. It is evident that the acoustical environment in classrooms can be one such deterrent. Excessive background noise and reverberation can affect the achievement and educational performance of children with sensorineural hearing loss (SNHL) and children with normal hearing sensitivity who have other auditory learning difficulties, as well as elementary school children with no verbal or hearing disabilities. The purpose of this study was to evaluate the extent of the problem of noise and reverberation in schools. To that end, we measured reverberation times and background noise levels in 32 different unoccupied elementary classrooms in eight public school buildings in central Ohio. The results were compared with the limits recommended in the American National Standards Institute standard for acoustical characteristics of classrooms in the United States (ANSI S12.60-2002). These measurements were also compared to the external and internal criteria variables developed by Crandell, Smaldino, & Flexer (1995) to determine if a simple checklist can accurately predict unwanted classroom background noise levels and reverberation. Results indicated that most classrooms were not in compliance with ANSI noise and reverberation standards. Further, our results suggested that a checklist was not a good predictor of the noisier and more reverberant rooms.

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Aboltins, Arturs, Juris Grizans, Dmitrijs Pikulins, Maris Terauds, and Maris Zeltins. "Design of Acoustic Signals for a Seal Deterrent Device." Electrical, Control and Communication Engineering 16, no. 2 (December 1, 2020): 72–77. http://dx.doi.org/10.2478/ecce-2020-0011.

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Abstract During the past decade, attacks by grey seals on fishing nets in the Baltic Sea have caused considerable loss of fish catch and damage to fishing gears. One of the approaches to reduce the number of seal attacks on fishing nets is to use acoustic deterrent devices (ADDs). Unfortunately, most of the commercially available ADDs are not well suited to the deployment in the sea and require considerable additional investments. The objective of the present research is to develop a compact and cost-efficient ADD for deployment in the sea environment. This paper is devoted to the design of acoustic signals for a prototype ADD. Signals from other experimental and commercially available ADDs are studied and compared. Moreover, limitations imposed by the underwater environment, transducers, battery power, and fish hearing are analysed and considered during the development of signal patterns. The results of tests conducted in an artificial reservoir and in the sea are presented.

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Sutin, Alexander, and Yegor Sinelnikov. "Time reversal acoustic approach for non‐lethal swimmer deterrent." Journal of the Acoustical Society of America 128, no. 4 (October 2010): 2336. http://dx.doi.org/10.1121/1.3508264.

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O'Connell, Victoria, Janice Straley, Joe Liddle, Lauren Wild, Linda Behnken, Dan Falvey, and Aaron Thode. "Testing a passive deterrent on longlines to reduce sperm whale depredation in the Gulf of Alaska." ICES Journal of Marine Science 72, no. 5 (February 17, 2015): 1667–72. http://dx.doi.org/10.1093/icesjms/fsv014.

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Abstract In Alaska, sperm whale (Physeter macrocephalus) depredation on longline sets has increased since implementation of the Individual Fishing Quota programme in 1995. A collaborative effort (SEASWAP) between longliners, scientists, and managers has undertaken research to evaluate this depredation with a primary objective to develop and test a passive deterrent that would reduce depredation without reducing catch rate of sablefish (Anoplopoma fimbria). Commercial longliners, fishing for their own sablefish quotas during the regular season, deployed beaded gear (25 mm lucite beads attached to gangions) with control gear and set recorders to collect acoustic data. Beaded and control gear were randomly assigned by skate quad (672 hooks) with 5 quads in each longline set. Acoustic recorders were used to document sperm whale creak–pause events, representative of depredation of the longline gear. Although there were more sablefish per skate quad on the beaded gear and there was a decrease in depredation events on the beaded gear compared with the control, neither effect was significant (p = 0.205 and 0.364, respectively). The SEASWAP project is testing other deterrent strategies including gear modifications and the establishment of a sighting network to improve avoidance.

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Huang, Dehua, Steve G. Christensen, Stephen G. Boucher, and Roger H. Tancrell. "Investigation of a smart trigger for an acoustic deterrent device." Journal of the Acoustical Society of America 101, no. 5 (May 1997): 3164. http://dx.doi.org/10.1121/1.419163.

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Götz, T., and V. M. Janik. "Target-specific acoustic predator deterrence in the marine environment." Animal Conservation 18, no. 1 (July 30, 2014): 102–11. http://dx.doi.org/10.1111/acv.12141.

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Findlay, C. R., H. D. Ripple, F. Coomber, K. Froud, O. Harries, N. C. F. van Geel, S. V. Calderan, S. Benjamins, D. Risch, and B. Wilson. "Mapping widespread and increasing underwater noise pollution from acoustic deterrent devices." Marine Pollution Bulletin 135 (October 2018): 1042–50. http://dx.doi.org/10.1016/j.marpolbul.2018.08.042.

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Vetter, Brooke J., Aaron R. Cupp, Kim T. Fredricks, Mark P. Gaikowski, and Allen F. Mensinger. "Acoustical deterrence of Silver Carp (Hypophthalmichthys molitrix)." Biological Invasions 17, no. 12 (August 25, 2015): 3383–92. http://dx.doi.org/10.1007/s10530-015-0964-6.

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31

Smotherman, Michael, Paul Sievert, Zara Dowling, Dan Carlson, and Yahya Modarres-Sadeghi. "Developing a biomimetic acoustic deterrent to reduce bat mortalities at wind turbines." Journal of the Acoustical Society of America 145, no. 3 (March 2019): 1775. http://dx.doi.org/10.1121/1.5101497.

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SHIMURA, Minoru, Tomoyoshi USHIOGI, and Masateru IKEHATA. "Development of an Acoustic Deterrent to Prevent Deer-train Collisions." Quarterly Report of RTRI 59, no. 3 (August 1, 2018): 207–11. http://dx.doi.org/10.2219/rtriqr.59.3_207.

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33

Huang, Long-Fei, Xiao-Mei Xu, Yi Tao, Rong-Xin Wang, Yang-Liang Zhou, and Fang-Gui Xiao. "Controllable acoustic deterrent based on the warning signals generated by nonel detonators." Marine Pollution Bulletin 188 (March 2023): 114646. http://dx.doi.org/10.1016/j.marpolbul.2023.114646.

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34

Graham, Isla M., Robert N. Harris, Becks Denny, Dan Fowden, and Dave Pullan. "Testing the effectiveness of an acoustic deterrent device for excluding seals from Atlantic salmon rivers in Scotland." ICES Journal of Marine Science 66, no. 5 (April 22, 2009): 860–64. http://dx.doi.org/10.1093/icesjms/fsp111.

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Abstract Graham, I. M., Harris, R. N., Denny, B., Fowden, D., and Pullan, D. 2009. Testing the effectiveness of an acoustic deterrent device for excluding seals from Atlantic salmon rivers in Scotland. – ICES Journal of Marine Science, 66: 860–864. In Scotland, there is frequent conflict between salmon rod fisheries and seals, which is often managed by the shooting of seals in rivers, with potential negative impacts on protected populations of seals. Non-lethal devices have not been tested extensively in rivers as an alternative to shooting. Trials were carried out between January and May 2006 on the River North Esk and between October 2007 and February 2008 on the River Conon in northeast Scotland to examine the effectiveness of an acoustic deterrent device (ADD) at deterring seals from a specific area of river and as a barrier to the upstream movement of seals. The ADD was switched on and off alternately for periods of several days, and surveys were carried out to estimate the number of seals present within each river. The ADD had no significant effect on the absolute abundance of seals in the survey area in either river, but it did reduce seal movement upstream significantly, by ∼50% in both rivers. This reduction was constant over the 4-month period of both trials. The results suggest that ADDs might be a useful conservation tool in the management of seal–salmon conflicts, particularly in estuaries and rivers where the potential for adversely impacting cetaceans is limited.

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Harris, R. N., C. M. Harris, C. D. Duck, and I. L. Boyd. "The effectiveness of a seal scarer at a wild salmon net fishery." ICES Journal of Marine Science 71, no. 7 (January 11, 2014): 1913–20. http://dx.doi.org/10.1093/icesjms/fst216.

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Abstract During 2009 and 2010 an Acoustic Deterrent Device (ADD) was tested at a salmon bagnet. Treatment blocks when the ADD was either on or off were randomly assigned and observations were carried out from shore. During periods when the ADD was switched on, there were fewer seals observed and approximately a third more fish were landed per hour than when the ADD was switched off, these differences were both significant. Model results indicated that the higher fish landings when the ADD was operating were a direct result of the reduction in the number of seals in the vicinity of the net. Photo-identification of the seals resulted in ten grey seals and four harbour seals being identified, and showed that the majority of these were identified on one occasion, and that two grey seals made up 63% of the visits to the study area when individuals were identified. Seal-damaged fish were only found within the bagnet during off treatments. Overall, the ADD was found to be an effective seal deterrent. Refinement in the method of ADD deployment could further increase effectiveness.

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Götz, T., and V. M. Janik. "The startle reflex in acoustic deterrence: an approach with universal applicability?" Animal Conservation 19, no. 3 (June 2016): 225–26. http://dx.doi.org/10.1111/acv.12295.

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Haymes, Gerard T., and Paul H. Patrick. "Exclusion of Adult Alewife, Alosa pseudoharengus Using Low-Frequency Sound for Application at Water Intakes." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 4 (April 1, 1986): 855–62. http://dx.doi.org/10.1139/f86-105.

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Experiments to test the effectiveness of low-frequency, high-intensity sound in excluding alewife, Alosa pseudoharengus, from an experimental net structure were conducted on Lake Ontario near Pickering, Ont. Sound was generated by modified seismic devices called pneumatic poppers. The number of alewife entering the experimental structure was reduced by 71–99% when the poppers were operating. Sonar evidence from one test suggested that another species which was not caught in the collection nets was less influenced by the acoustic deterrent. The results suggest that low-frequency, high-intensity sound may be effective in reducing losses of adult alewife at water intakes.

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Noatch, Matthew R., and Cory D. Suski. "Non-physical barriers to deter fish movements." Environmental Reviews 20, no. 1 (March 2012): 71–82. http://dx.doi.org/10.1139/a2012-001.

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Anthropogenic modifications to aquatic ecosystems have altered connecting pathways within, and in some cases, between watersheds. Human structures, such as hydroelectric facilities, often impede fish migrations and may inflict heavy mortality on fish that become impinged or entrained. Conversely, an increase in connectivity between two waterways (e.g., through the construction of shipping canals, increased boat traffic) often results in an elevated risk of invasive species introductions. Non-physical barriers, which obstruct fish from an undesirable location without influencing the waterway, are one management approach to protecting valuable fish stocks and deterring biological invasions. Because many methods of behavioral deterrence have been employed against fish, there is a need to summarize and compare existing and developing technologies. This review details the use and application of electrical, visual, acoustic, chemical, and hydrological deterrence techniques that may be used to prevent fish movements. Site requirements are discussed, and a critical assessment of benefits and limitations to each technique are given. Because no single method of fish deterrence is “one size fits all”, this review to non-physical fish barrier technology will benefit managers and researchers attempting to develop a best-fit strategy on a case-by-case basis.

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Götz, T., and VM Janik. "Acoustic deterrent devices to prevent pinniped depredation: efficiency, conservation concerns and possible solutions." Marine Ecology Progress Series 492 (October 31, 2013): 285–302. http://dx.doi.org/10.3354/meps10482.

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40

Bzonek, Paul A., Alexander Van Nynatten, and Nicholas E. Mandrak. "Phylogenetic signal found in fish–community response to an acoustic common carp deterrent." Freshwater Biology 66, no. 9 (July 7, 2021): 1698–708. http://dx.doi.org/10.1111/fwb.13785.

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41

Mahfurdz, Azrul, Sunardi Sunardi, H. Ahmad, Syed Abdullah, and Nazuki Nazuki. "Distinguish Sea Turtle and Fish Using Sound Technique in Designing Acoustic Deterrent Device." TELKOMNIKA (Telecommunication Computing Electronics and Control) 13, no. 4 (December 1, 2015): 1305. http://dx.doi.org/10.12928/telkomnika.v13i4.1827.

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42

Vetter, Brooke J., Kelsie A. Murchy, Aaron R. Cupp, Jon J. Amberg, Mark P. Gaikowski, and Allen F. Mensinger. "Acoustic deterrence of bighead carp (Hypophthalmichthys nobilis) to a broadband sound stimulus." Journal of Great Lakes Research 43, no. 1 (February 2017): 163–71. http://dx.doi.org/10.1016/j.jglr.2016.11.009.

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43

Khorozyan, Igor, and Matthias Waltert. "How long do anti-predator interventions remain effective? Patterns, thresholds and uncertainty." Royal Society Open Science 6, no. 9 (September 11, 2019): 190826. http://dx.doi.org/10.1098/rsos.190826.

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Human–predator conflicts are globally widespread, and effective interventions are essential to protect human assets from predator attacks. As effectiveness also has a temporal dimension, it is of importance to know how long interventions remain most effective and to determine time thresholds at which effectiveness begins to decrease. To address this, we conducted a systematic review of the temporal changes in the effectiveness of non-invasive interventions against terrestrial mammalian predators, defining a temporal trend line of effectiveness for each published case. We found only 26 cases from 14 publications, mainly referring to electric fences ( n = 7 cases) and deterrents ( n = 7 cases). We found electric fences and calving control to remain highly effective for the longest time, reducing damage by 100% for periods between three months and 3 years. The effectiveness of acoustical and light deterrents as well as guarding animals eroded quite fast after one to five months. Supplemental feeding was found to be counter-productive by increasing damage over time instead of reducing it. We stress that it is vital to make monitoring a routine requirement for all intervention applications and suggest to standardize periods of time over which monitoring can produce meaningful and affordable information.

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Romano, W. Brad, John R. Skalski, Richard L. Townsend, Kevin W. Kinzie, Karyn D. Coppinger, and Myron F. Miller. "Evaluation of an acoustic deterrent to reduce bat mortalities at an Illinois wind farm." Wildlife Society Bulletin 43, no. 4 (November 25, 2019): 608–18. http://dx.doi.org/10.1002/wsb.1025.

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45

Todd, Victoria L. G., Laura D. Williamson, Jian Jiang, Sophie E. Cox, Ian B. Todd, and Maximilian Ruffert. "Prediction of marine mammal auditory-impact risk from Acoustic Deterrent Devices used in Scottish aquaculture." Marine Pollution Bulletin 165 (April 2021): 112171. http://dx.doi.org/10.1016/j.marpolbul.2021.112171.

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46

Kastelein, Ronald A., Janne Huybrechts, Jennifer Covi, and Lean Helder-Hoek. "Behavioral Responses of a Harbor Porpoise (Phocoena phocoena) to Sounds from an Acoustic Porpoise Deterrent." Aquatic Mammals 43, no. 3 (May 15, 2017): 233–44. http://dx.doi.org/10.1578/am.43.3.2017.233.

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Arnett, Edward B., Cris D. Hein, Michael R. Schirmacher, Manuela M. P. Huso, and Joseph M. Szewczak. "Evaluating the Effectiveness of an Ultrasonic Acoustic Deterrent for Reducing Bat Fatalities at Wind Turbines." PLoS ONE 8, no. 6 (June 19, 2013): e65794. http://dx.doi.org/10.1371/journal.pone.0065794.

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48

Isbell, Lynne A., and Laura R. Bidner. "Vervet monkey (Chlorocebus pygerythrus) alarm calls to leopards (Panthera pardus) function as a predator deterrent." Behaviour 153, no. 5 (2016): 591–606. http://dx.doi.org/10.1163/1568539x-00003365.

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Behavioural predator–prey interactions are difficult to study, especially when predators avoid humans. To gain greater understanding of their dynamism, we conducted a 14-month field study in which we minimized human presence by employing acoustic recorders and camera traps, along with GPS collars deployed on vervet monkeys (Chlorocebus pygerythrus) and leopards (Panthera pardus) in Laikipia, Kenya. Recordings at the vervets’ sleeping site revealed that they gave ‘leopard’ alarm calls most frequently near dusk and dawn, whereas photographs showed that leopards approached vervets more closely at night, when the monkeys alarm-called less often. GPS data showed that after vervets alarm-called, leopards within 200 m quickly moved away, changing direction, but when vervets did not alarm-call, leopards continued moving forward. These results reveal that vervets’ leopard alarm calls function as a predator deterrent in addition to a conspecific warning call.

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Shapiro, Ari D., Jakob Tougaard, Poul Boel Jørgensen, Line A. Kyhn, Jeppe Dalgaard Balle, Cristina Bernardez, Arne Fjälling, Junita Karlsen, and Magnus Wahlberg. "Transmission loss patterns from acoustic harassment and deterrent devices do not always follow geometrical spreading predictions." Marine Mammal Science 25, no. 1 (January 2009): 53–67. http://dx.doi.org/10.1111/j.1748-7692.2008.00243.x.

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Wamboldt, James. "Evaluation of an acoustic fish deterrent system in shallow water application at the Emiquon Preserve, Lewistown, IL." Management of Biological Invasions 10, no. 3 (2019): 536–58. http://dx.doi.org/10.3391/mbi.2019.10.3.09.

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