BEHAVIORAL RESPONSES OF<i>SOTALIA FLUVIATILIS</i>(CETACEA, DELPHINIDAE) TO ACOUSTIC PINGERS, FORTALEZA, BRAZIL

Monteiro‐Neto, Cassiano; Vila, Francisco Jose C. A; Alves‐Jr, Tarcísio T.; Araüjo, Douglas Silva; Campos, Alberto Alves; Martins, Aline Maria Araújo; Parente, Cristiano Leite; Manuel, A; Furtado‐Neto, Rade; Lien, Jon

doi:10.1111/j.1748-7692.2004.tb01145.x

Cited by 22 publications

(8 citation statements)

References 9 publications

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“…Such displacement zones do not appear to occur with bottlenose dolphins; indeed Cox et al (2004) found no significant difference in the closest point of approach of dolphins to active or inactive pingers. No clear zone of exclusion was observed in studies of Hector's dolphin (Stone et al 1997) or of tucuxi (Monteiro-Neto et al 2004). Pseudo-replication problems in both these studies invalidate their apparently significant statistical results (Dawson & Lusseau 2005).…”

Section: How Do Pingers Work?mentioning

confidence: 94%

“…Surfacing positions of tucuxi Sotalia fluviatilis (Monteiro-Neto et al 2004), Sousa chinensis (Berg Soto et al 2009) and Hector's dolphin (Stone et al 1997) were not obviously affected by the presence of active Netmark 100 or Fumunda pingers. These species did not show the clear zone of displacement demonstrated by harbour porpoises.…”

Section: Studies Of Behavioural Responses To Pingersmentioning

confidence: 99%

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To ping or not to ping: the use of active acoustic devices in mitigating interactions between small cetaceans and gillnet fisheries

Dawson

Northridge²,

Waples³

et al. 2013

Endang. Species. Res.

110

134

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Active sound emitters ('pingers') are used in several gillnet fisheries to reduce bycatch of small cetaceans, and/or to reduce depredation by dolphins. Here, we review studies conducted to determine how effective these devices may be as management tools. Significant reductions in bycatch of harbour porpoise Phocoena phocoena, franciscana Pontoporia blainvillei, common Delphinus delphis and striped dolphin Stenella coeruleoalba, and beaked whales as a group have been demonstrated. For harbour porpoise this result has been replicated in 14 controlled experiments in North America and Europe, and appears to be due to porpoises avoiding the area ensonified by pingers. Two gillnet fisheries (California-Oregon driftnet fishery for swordfish; New England groundfish fishery) with mandatory pinger use have been studied for over a decade. Bycatch rates of dolphins/porpoises have fallen by 50 to 60%, and there is no evidence of bycatch increasing over time due to habituation. In both fisheries, bycatch rates were significantly higher in nets sparsely equipped with pingers or in which pingers had failed, than in nets without any pingers at all. Studies of pinger use to reduce depredation by bottlenose dolphins Tursiops truncatus generally show small and inconsistent improvements in fish catches and somewhat reduced net damage. Dolphin bycatch in these fisheries is rare, but still occurs in nets with pingers. Taken together, these studies suggest that the most promising candidates for bycatch reduction via pinger use will be gillnet fisheries in developed countries in which the bycaught cetaceans are generally neophobic species with large home ranges. We offer a set of lessons learned from the last decade of bycatch management.KEY WORDS: Gillnet · Bycatch · Dolphin · Porpoise · Pinger · Acoustic devices Resale or republication not permitted without written consent of the publisher Contribution to the Theme Section 'Techniques for reducing bycatch of marine mammals in gillnets'

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Section: How Do Pingers Work?mentioning

confidence: 94%

Section: Studies Of Behavioural Responses To Pingersmentioning

confidence: 99%

To ping or not to ping: the use of active acoustic devices in mitigating interactions between small cetaceans and gillnet fisheries

Dawson

Northridge²,

Waples³

et al. 2013

Endang. Species. Res.

110

134

View full text Add to dashboard Cite

show abstract

“…There was no significant movement away from the active pingers and dugongs swam between active pingers set 55 m apart. Thus, concerns about pingers displacing dugongs are unfounded in contrast to some cetaceans including the tucuxi Sotalia fluviatilis (Monteiro-Neto et al, 2004), harbour porpoise (Laake et al, 1998;Culik et al, 2001;Carlstrom et al, 2002) and Hector's dolphin (Stone et al, 1997).…”

Section: Potential For Noise Disturbance or Displacementmentioning

confidence: 96%

Is attempting to change marine mammal behaviour a generic solution to the bycatch problem? A dugong case study

Hodgson

Marsh

Delean

et al. 2007

Animal Conservation

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Incidental bycatch in fishing nets is a global cause of incidental mortality of marine mammals. Two classes of approaches attempt to mitigate this impact: (1) approaches that change the behaviour of the fisher (e.g. closures and gear modifications), (2) approaches that attempt to change the behaviour of the bycatch species (e.g. acoustic alarms or pingers). Even though the effectiveness of pingers has been established for very few bycatch species, pingers are now mandatory in many fisheries throughout the world. Pingers are being trialled in commercial gill net fisheries in tropical Australia to reduce the bycatch of the dugong and three species of coastal dolphins, despite an absence of robust assessments of: (1) their effectiveness in reducing bycatch, (2) the likelihood of alienating bycatch species from critical habitats. We conducted replicate experiments to test the behavioural responses of dugongs to 4 and 10 kHz pingers in an array simulating a net. Each experiment comprised three sequential 10-min treatments in which two pingers were: (1) inactive, (2) active, (3) inactive. The rate of decline of the number of dugongs within the focal arena did not change significantly while pingers were activated. Dugongs passed between the pingers (where a net would be located) irrespective of whether the alarms were active or inactive, fed throughout the experiments and did not change their orientation to investigate pinger noise, or their likelihood of vocalizing. We conclude that: (1) pingers are unlikely to alienate dugongs from critical habitats or reduce dugong mortalities in fishing nets, (2) bycatch mitigation strategies such as pingers that rely on changing animal behaviour should only be used after rigorous testing on all likely bycatch species.

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“…Incidental catches of Guiana dolphins have been recorded along the entire Brazilian coast (Lodi and Capistrano, 1990;Simões-Lopes and Ximenez, 1990;Barros and Teixeira, 1994;Siciliano, 1994) and some efforts to avoid or reduce bycatch has been implemented, such as the use of acoustic pingers (Monteiro Neto et al, 2004) and awareness campaigns (Fragoso et al, 1996 5 ). These incidental catches may be causing negative impacts on the populations of Guiana dolphins at the State of Ceará.…”

Section: Discussionmentioning

confidence: 99%

Records of Guiana dolphin, Sotalia guianensis, in the State of Ceará, Northeastern Brazil

Meirelles¹,

Ribeiro²,

Silva³

et al. 2010

Lat. Am. J. Aquat. Mamm.

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BEHAVIORAL RESPONSES OFSOTALIA FLUVIATILIS(CETACEA, DELPHINIDAE) TO ACOUSTIC PINGERS, FORTALEZA, BRAZIL

Cited by 22 publications

References 9 publications

To ping or not to ping: the use of active acoustic devices in mitigating interactions between small cetaceans and gillnet fisheries

To ping or not to ping: the use of active acoustic devices in mitigating interactions between small cetaceans and gillnet fisheries

Is attempting to change marine mammal behaviour a generic solution to the bycatch problem? A dugong case study

Records of Guiana dolphin, Sotalia guianensis, in the State of Ceará, Northeastern Brazil

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