Harbor porpoise (Phocoena phocoena ) reactions to pingers

Lotte Kindt-Larsen*, Casper Willestofte Berg, Simon Northridge, Finn Larsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The use of acoustic alarms (pingers) has been mandated in several gill net fisheries around the world. Even though pingers have shown to reduce the incidental catch there are still questions to be answered in relation to effective range, habituation and displacement. In the present studies, the vocalization behavior of porpoises was recorded in response to two different pingers, AQUAmark100 (20–160 kHz) and AQUAmark300 (10 kHz). The Scottish experiment included an AQUAmark100 pinger running in on/off cycles. The pinger was placed in an array of acoustic click detectors (C‐PODs) spaced at different distances from the pinger. In Denmark, three experiments were conducted. One had the same AQUAmark100 pinger placed in a C‐POD array. The second and third experiment used an AQUAmark300 pinger running in on/off cycles. Both trial results of the AQUAmark100 revealed significant pinger reduction effects at 0, 200, and 400 m distance; however, the vocalization behavior reveal no signs of habituation. The studies of the AQUAmark300 revealed a significant pinger effect at 0 m distance and either none or 17% reduction at 300 m distance. At one station, however, habituation effects were found indicated by an increase in clicks over time. These results are important in relation to pinger use and thus fisheries management.
Original languageEnglish
JournalMarine Mammal Science
Volume35
Issue number2
Pages (from-to)552-573
ISSN0824-0469
DOIs
Publication statusPublished - 2019

Keywords

  • Harbor porpoise
  • Phocoena phocoena
  • Pinger
  • Natura2000
  • Habituation
  • Pinger effect
  • Habitat exclusion
  • Porpoise management

Cite this

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title = "Harbor porpoise (Phocoena phocoena ) reactions to pingers",
abstract = "The use of acoustic alarms (pingers) has been mandated in several gill net fisheries around the world. Even though pingers have shown to reduce the incidental catch there are still questions to be answered in relation to effective range, habituation and displacement. In the present studies, the vocalization behavior of porpoises was recorded in response to two different pingers, AQUAmark100 (20–160 kHz) and AQUAmark300 (10 kHz). The Scottish experiment included an AQUAmark100 pinger running in on/off cycles. The pinger was placed in an array of acoustic click detectors (C‐PODs) spaced at different distances from the pinger. In Denmark, three experiments were conducted. One had the same AQUAmark100 pinger placed in a C‐POD array. The second and third experiment used an AQUAmark300 pinger running in on/off cycles. Both trial results of the AQUAmark100 revealed significant pinger reduction effects at 0, 200, and 400 m distance; however, the vocalization behavior reveal no signs of habituation. The studies of the AQUAmark300 revealed a significant pinger effect at 0 m distance and either none or 17{\%} reduction at 300 m distance. At one station, however, habituation effects were found indicated by an increase in clicks over time. These results are important in relation to pinger use and thus fisheries management.",
keywords = "Harbor porpoise, Phocoena phocoena, Pinger, Natura2000, Habituation, Pinger effect, Habitat exclusion, Porpoise management",
author = "Lotte Kindt-Larsen and Berg, {Casper Willestofte} and Simon Northridge and Finn Larsen",
year = "2019",
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language = "English",
volume = "35",
pages = "552--573",
journal = "Marine Mammal Science",
issn = "0824-0469",
publisher = "Wiley-Blackwell",
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}

Harbor porpoise (Phocoena phocoena ) reactions to pingers. / Kindt-Larsen, Lotte; Berg, Casper Willestofte; Northridge, Simon; Larsen, Finn.

In: Marine Mammal Science, Vol. 35, No. 2, 2019, p. 552-573.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Harbor porpoise (Phocoena phocoena ) reactions to pingers

AU - Kindt-Larsen, Lotte

AU - Berg, Casper Willestofte

AU - Northridge, Simon

AU - Larsen, Finn

PY - 2019

Y1 - 2019

N2 - The use of acoustic alarms (pingers) has been mandated in several gill net fisheries around the world. Even though pingers have shown to reduce the incidental catch there are still questions to be answered in relation to effective range, habituation and displacement. In the present studies, the vocalization behavior of porpoises was recorded in response to two different pingers, AQUAmark100 (20–160 kHz) and AQUAmark300 (10 kHz). The Scottish experiment included an AQUAmark100 pinger running in on/off cycles. The pinger was placed in an array of acoustic click detectors (C‐PODs) spaced at different distances from the pinger. In Denmark, three experiments were conducted. One had the same AQUAmark100 pinger placed in a C‐POD array. The second and third experiment used an AQUAmark300 pinger running in on/off cycles. Both trial results of the AQUAmark100 revealed significant pinger reduction effects at 0, 200, and 400 m distance; however, the vocalization behavior reveal no signs of habituation. The studies of the AQUAmark300 revealed a significant pinger effect at 0 m distance and either none or 17% reduction at 300 m distance. At one station, however, habituation effects were found indicated by an increase in clicks over time. These results are important in relation to pinger use and thus fisheries management.

AB - The use of acoustic alarms (pingers) has been mandated in several gill net fisheries around the world. Even though pingers have shown to reduce the incidental catch there are still questions to be answered in relation to effective range, habituation and displacement. In the present studies, the vocalization behavior of porpoises was recorded in response to two different pingers, AQUAmark100 (20–160 kHz) and AQUAmark300 (10 kHz). The Scottish experiment included an AQUAmark100 pinger running in on/off cycles. The pinger was placed in an array of acoustic click detectors (C‐PODs) spaced at different distances from the pinger. In Denmark, three experiments were conducted. One had the same AQUAmark100 pinger placed in a C‐POD array. The second and third experiment used an AQUAmark300 pinger running in on/off cycles. Both trial results of the AQUAmark100 revealed significant pinger reduction effects at 0, 200, and 400 m distance; however, the vocalization behavior reveal no signs of habituation. The studies of the AQUAmark300 revealed a significant pinger effect at 0 m distance and either none or 17% reduction at 300 m distance. At one station, however, habituation effects were found indicated by an increase in clicks over time. These results are important in relation to pinger use and thus fisheries management.

KW - Harbor porpoise

KW - Phocoena phocoena

KW - Pinger

KW - Natura2000

KW - Habituation

KW - Pinger effect

KW - Habitat exclusion

KW - Porpoise management

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EP - 573

JO - Marine Mammal Science

JF - Marine Mammal Science

SN - 0824-0469

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ER -