Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland
Little is known of the spatio-temporal occurrence of beaked whales off western Ireland, limiting the ability of Regulators to implement appropriate management and conservation measures. To address this knowledge gap, static acoustic monitoring was carried out using eight fixed bottom-mounted autonom...
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ftnuigalway:oai:aran.library.nuigalway.ie/:10379/12307 2023-06-11T04:12:31+02:00 Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland Kowarski, Katie Delarue, Julien Martin, Bruce O’Brien, Joanne Meade, Rossa Ó. Cadhla, Oliver Berrow, Simon 2018-06-21 http://hdl.handle.net/10379/12307 https://doi.org/10.1371/journal.pone.0199431 unknown Public Library of Science (PLoS) PLOS ONE Kowarski, Katie; Delarue, Julien; Martin, Bruce; O’Brien, Joanne; Meade, Rossa; Ó. Cadhla, Oliver; Berrow, Simon (2018). Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland. PLOS ONE 13 (6), 1932-6203 http://hdl.handle.net/10379/12307 doi:10.1371/journal.pone.0199431 Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ bottle-nosed whales marine protected area hyperoodon-ampullatus ziphius-cavirostris north-atlantic mesoplodon-densirostris foraging activity diving behavior cephalopods strandings Article 2018 ftnuigalway https://doi.org/10.1371/journal.pone.0199431 2023-05-28T18:05:32Z Little is known of the spatio-temporal occurrence of beaked whales off western Ireland, limiting the ability of Regulators to implement appropriate management and conservation measures. To address this knowledge gap, static acoustic monitoring was carried out using eight fixed bottom-mounted autonomous acoustic recorders: four from May to December 2015 on Ireland's northern slope and four from March to November 2016 on the western and southern slopes. Recorders ran for 205 to 230 days, resulting in 4.09 TB of data sampled at 250 kHz which could capture beaked whale acoustic signals. Zero-crossing-based automated detectors identified beaked whale clicks. A sample of detections was manually validated to evaluate and optimize detector performance. Analysis confirmed the occurrence of Sowerby's and Cuvier's beaked whales and Northern bottlenose whales. Northern bottlenose whale clicks occurred in late summer and autumn, but were too few to allow further analysis. Cuvier's and Sowerby's clicks occurred at all stations throughout the monitoring period. There was a significant effect of month and station (latitude) on the mean daily number of click detections for both species. Cuvier's clicks were more abundant at lower latitudes while Sowerby's were greater at higher latitudes, particularly in the spring, suggesting a spatial segregation between species, possibly driven by prey preference. Cuvier's occurrence increased in late autumn 2015 off northwest Porcupine Bank, a region of higher relative occurrence for each species. Seismic airgun shots, with daily sound exposure levels as high as 175 dB re 1 mu Pa-2.s, did not appear to impact the mean daily number of Cuvier's or Sowerby's beaked whale click detections. This work provides insight into the significance of Irish waters for beaked whales and highlights the importance of using acoustics for beaked whale monitoring. Article in Journal/Newspaper hyperoodon ampullatus North Atlantic Northern bottlenose whale Sowerby's beaked whale National University of Ireland (NUI), Galway: ARAN Porcupine Bank ENVELOPE(-13.667,-13.667,53.333,53.333) PLOS ONE 13 6 e0199431 |
institution |
Open Polar |
collection |
National University of Ireland (NUI), Galway: ARAN |
op_collection_id |
ftnuigalway |
language |
unknown |
topic |
bottle-nosed whales marine protected area hyperoodon-ampullatus ziphius-cavirostris north-atlantic mesoplodon-densirostris foraging activity diving behavior cephalopods strandings |
spellingShingle |
bottle-nosed whales marine protected area hyperoodon-ampullatus ziphius-cavirostris north-atlantic mesoplodon-densirostris foraging activity diving behavior cephalopods strandings Kowarski, Katie Delarue, Julien Martin, Bruce O’Brien, Joanne Meade, Rossa Ó. Cadhla, Oliver Berrow, Simon Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland |
topic_facet |
bottle-nosed whales marine protected area hyperoodon-ampullatus ziphius-cavirostris north-atlantic mesoplodon-densirostris foraging activity diving behavior cephalopods strandings |
description |
Little is known of the spatio-temporal occurrence of beaked whales off western Ireland, limiting the ability of Regulators to implement appropriate management and conservation measures. To address this knowledge gap, static acoustic monitoring was carried out using eight fixed bottom-mounted autonomous acoustic recorders: four from May to December 2015 on Ireland's northern slope and four from March to November 2016 on the western and southern slopes. Recorders ran for 205 to 230 days, resulting in 4.09 TB of data sampled at 250 kHz which could capture beaked whale acoustic signals. Zero-crossing-based automated detectors identified beaked whale clicks. A sample of detections was manually validated to evaluate and optimize detector performance. Analysis confirmed the occurrence of Sowerby's and Cuvier's beaked whales and Northern bottlenose whales. Northern bottlenose whale clicks occurred in late summer and autumn, but were too few to allow further analysis. Cuvier's and Sowerby's clicks occurred at all stations throughout the monitoring period. There was a significant effect of month and station (latitude) on the mean daily number of click detections for both species. Cuvier's clicks were more abundant at lower latitudes while Sowerby's were greater at higher latitudes, particularly in the spring, suggesting a spatial segregation between species, possibly driven by prey preference. Cuvier's occurrence increased in late autumn 2015 off northwest Porcupine Bank, a region of higher relative occurrence for each species. Seismic airgun shots, with daily sound exposure levels as high as 175 dB re 1 mu Pa-2.s, did not appear to impact the mean daily number of Cuvier's or Sowerby's beaked whale click detections. This work provides insight into the significance of Irish waters for beaked whales and highlights the importance of using acoustics for beaked whale monitoring. |
format |
Article in Journal/Newspaper |
author |
Kowarski, Katie Delarue, Julien Martin, Bruce O’Brien, Joanne Meade, Rossa Ó. Cadhla, Oliver Berrow, Simon |
author_facet |
Kowarski, Katie Delarue, Julien Martin, Bruce O’Brien, Joanne Meade, Rossa Ó. Cadhla, Oliver Berrow, Simon |
author_sort |
Kowarski, Katie |
title |
Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland |
title_short |
Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland |
title_full |
Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland |
title_fullStr |
Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland |
title_full_unstemmed |
Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland |
title_sort |
signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland |
publisher |
Public Library of Science (PLoS) |
publishDate |
2018 |
url |
http://hdl.handle.net/10379/12307 https://doi.org/10.1371/journal.pone.0199431 |
long_lat |
ENVELOPE(-13.667,-13.667,53.333,53.333) |
geographic |
Porcupine Bank |
geographic_facet |
Porcupine Bank |
genre |
hyperoodon ampullatus North Atlantic Northern bottlenose whale Sowerby's beaked whale |
genre_facet |
hyperoodon ampullatus North Atlantic Northern bottlenose whale Sowerby's beaked whale |
op_relation |
PLOS ONE Kowarski, Katie; Delarue, Julien; Martin, Bruce; O’Brien, Joanne; Meade, Rossa; Ó. Cadhla, Oliver; Berrow, Simon (2018). Signals from the deep: spatial and temporal acoustic occurrence of beaked whales off western ireland. PLOS ONE 13 (6), 1932-6203 http://hdl.handle.net/10379/12307 doi:10.1371/journal.pone.0199431 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ |
op_doi |
https://doi.org/10.1371/journal.pone.0199431 |
container_title |
PLOS ONE |
container_volume |
13 |
container_issue |
6 |
container_start_page |
e0199431 |
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1768388437135589376 |