Temporal patterns in the acoustic signals of beaked whales at Cross Seamount

Johnston, David W.; McDonald, Mark A.; Polovina, Jeffrey J.; Domokos, Réka; Wiggins, Sean M.; Hildebrand, John A.

doi:10.1098/rsbl.2007.0614

Cited by 68 publications

(42 citation statements)

References 16 publications

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“…The resulting patterns in prediction maps produced for 2 different seasons (Fig. 11) are in good agreement with general patterns observed for the depth of the SSL in the North Pacific: from 200 m near the coast to 400 m farther offshore in the California Current, and ~500 to 600 m near Hawaii (Tont 1975, Kalish et al 1986, Johnston et al 2008.…”

Section: Modelingsupporting

confidence: 67%

Modeling swordfish daytime vertical habitat in the North Pacific Ocean from pop-up archival tags

Abécassis¹,

Dewar²,

Hawn³

et al. 2012

Mar. Ecol. Prog. Ser.

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The daytime foraging depth of swordfish in the North Pacific was investigated with data from an 8 yr tagging program, using 28 Wildlife Computer pop-up archival tags deployed on swordfish in the North Pacific. The tags transmitted data from 1°S to 44°N latitude and from 206 to 249°E longitude. Five tags were recovered, providing a full archival record that showed that when swordfish did not engage in daytime basking behavior, they remained within a narrow range of light level during both day and night, suggesting swordfish stay within a soundscattering layer (SSL) to feed during both day and night. Daytime mean depth of non-basking swordfish ranged from 32 to 760 m. Seventy-seven percent of the daytime mean depth could be explained with a generalized additive model that used 3 environmental indices: satellite-derived surface chlorophyll as a proxy for light at depth, oxygen at 400 m obtained from the World Ocean Atlas, and temperature at 400 m inferred from the tag data. This model, when used in a predictive mode, generated a basin-wide map of swordfish daytime mean depth that showed depths exceeding 600 m to the north of Hawaii, shoaling to 300 m off the coast of California. This information could improve daytime swordfish catch by longliners and potentially allow them to switch from shallow night sets that result in interactions with sea turtles. This approach in effect defines the habitat of swordfish prey, giving us insight into the vertical behavior of those mid-trophic level organisms inhabiting the SSL. Our model could be easily applied to other deep-foraging species. KEY WORDS: Xiphias gladius · Swordfish · Satellite tracking · Generalized additive model · Habitat modellingResale or republication not permitted without written consent of the publisher

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Section: Modelingsupporting

confidence: 67%

Modeling swordfish daytime vertical habitat in the North Pacific Ocean from pop-up archival tags

Abécassis¹,

Dewar²,

Hawn³

et al. 2012

Mar. Ecol. Prog. Ser.

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“…We believe this is one of the reasons for the much clear day-night differences in backscattering intensity in Gigante, as opposed to Condor where diel changes were small. Although video imagery and net sampling provided only limited evidence of the presence of vertically migrant fishes on the Condor plateau (Porteiro et al, 2011, topographic blockage has been suggested as one of the mechanisms responsible for the increased nighttime micronekton abundance at other shallow/intermediate seamounts (Boehlert, 1988;Johnston et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Like other topographic features, seamounts can shape the aggregation of pelagic organisms and many seamounts support unusually high biomass of micronekton SLs compared to the surrounding ocean (e.g., Boehlert, 1988;Johnston et al, 2008;Letessier et al, in press). Various non-exclusive mechanisms may explain increased micronekton biomass over seamounts.…”

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confidence: 99%

Persistent Enhancement of Micronekton Backscatter at the Summits of Seamounts in the Azores

et al. 2017

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Knowledge of the dynamics of micronekton at seamounts is critical to understanding the ecological role of these ecosystems. Active acoustic techniques are an effective tool to monitor the distribution and movements of pelagic organisms. We carried out several day-and nighttime active acoustic surveys over a 3-year period (2009)(2010)(2011) to characterize the spatial and temporal distribution of micronekton backscatter on two seamounts (Condor and Gigante) in the Azores and in the surrounding open-waters. The highest mean volume backscattering strength (MVBS) was consistently found in the water column over the seamount summits, regardless of the season and diel period. MVBS over the summits was 14-26 times higher than over the slopes, and 10 times higher than in open-waters. Diel variations in backscatter intensity were more pronounced in open-waters and in Gigante seamount, with higher values during the day in open-waters, and at night over the summits and slopes of Gigante. Over Condor seamount, diel changes in backscatter intensity were small, but MVBS was generally higher at night than during the day, as in Gigante. Persistence of strong acoustic backscatter over the summits of Condor and Gigante seamounts is a key finding of this study and may be explained by the presence of a seamount-associated micronekton community and by the retention of vertically migrating micronekton. The latter hypothesis is consistent with observed day-night differences in backscatter, suggesting that nocturnal migrants may be passively transported or actively swim above seamount summits and slopes. Possible physical mechanisms leading to the observed patterns in micronekton distribution are discussed. This study contributes to a better understanding of how seamounts may influence the spatial and temporal dynamics of micronekton assemblages.

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“…All three species produce upsweep frequency modulated ͑FM͒ pulses, which are species and activity specific. Johnston et al ͑2008͒ andMcDonald et al ͑2009͒ report an FM ultrasonic sound of unknown origin with beaked whale characteristics, discovered on a long-term broadband acoustic recording from Cross Seamount, HI. Other beaked whales within the genus Hyperoodon and Berardius also use short duration, broadband echolocation clicks but restrictions in sampling frequency do not allow for judgment whether these signals have a frequency sweep a͒ ͑Dawson et al, 1998;Rogers and Brown, 1999;Hooker and Whitehead, 2002͒.…”

Section: Introductionmentioning

confidence: 98%

Echolocation signals of a beaked whale at Palmyra Atoll

Baumann‐Pickering

Wiggins

Roth

et al. 2010

The Journal of the Acoustical Society of America

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Acoustic recordings from Palmyra Atoll, northern Line Islands, central Pacific, showed upsweep frequency modulated pulses reminiscent of those produced by beaked whales. These signals had higher frequencies, broader bandwidths, longer pulse durations and shorter inter-pulse intervals than previously described pulses of Blainville's, Cuvier's and Gervais' beaked whales [Zimmer et al. (2005). J. Acoust. Soc. Am. 117, 3919-3927; Johnson et al. (2006). J. Exp. Biol. 209, 5038-5050; Gillespie et al. (2009). J. Acoust. Soc. Am. 125, 3428-3433]. They were distinctly different temporally and spectrally from the unknown beaked whale at Cross Seamount, HI [McDonald et al. (2009). J. Acoust. Soc. Am. 125, 624-627]. Genetics on beaked whale specimens found at Palmyra Atoll suggest the presence of a poorly known beaked whale species. Mesoplodon sp. might be the source of the FM pulses described in this paper. The Palmyra Atoll FM pulse peak frequency was at 44 kHz with a -10 dB bandwidth of 26 kHz. Mean pulse duration was 355 mus and inter-pulse interval was 225 ms, with a bimodal distribution. Buzz sequences were detected with inter-pulse intervals below 20 ms and unmodulated spectra, with about 20 dB lower amplitude than prior FM pulses. These clicks had a 39 kHz bandwidth (-10 dB), peak frequency at 37 kHz, click duration 155 mus, and inter-click interval between 4 and 10 ms.

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Temporal patterns in the acoustic signals of beaked whales at Cross Seamount

Cited by 68 publications

References 16 publications

Modeling swordfish daytime vertical habitat in the North Pacific Ocean from pop-up archival tags

Modeling swordfish daytime vertical habitat in the North Pacific Ocean from pop-up archival tags

Persistent Enhancement of Micronekton Backscatter at the Summits of Seamounts in the Azores

Echolocation signals of a beaked whale at Palmyra Atoll

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