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Julien Delarue
JASCO Applied Sciences
OceanographyPhysicsWhaleBalaenopteraFishery
23Publications
7H-index
166Citations
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Publications 23
Newest
#1Frederick I. ArcherH-Index: 20
#2Shannon RankinH-Index: 16
Last. Julien Delarue (JASCO Applied Sciences)H-Index: 7
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#1Katie Kowarski (JASCO Applied Sciences)H-Index: 4
#2Julien Delarue (JASCO Applied Sciences)H-Index: 7
Last. Simon Berrow (Galway-Mayo Institute of Technology)H-Index: 19
view all 7 authors...
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...
4 CitationsSource
#1Giacomo GiorliH-Index: 5
#2Kimberly T. GoetzH-Index: 8
Last. Craig McPherson (JASCO Applied Sciences)
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The echolocation signals of most beaked whale species are still unknown. In fact, out of the 22 species comprising the family Ziphiidae, only the echolocation pulses for 7 species have been clearly described. This study describes two distinct beaked whale echolocation signals recorded in the Cook Strait region using passive acoustic technology. These signals differ from previously described Ziphiid species clicks. A description of the time-frequency characteristics of the two signals is provided...
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#1Shannon RankinH-Index: 16
#2Manuel CastelloteH-Index: 1
view all 11 authors...
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#1Arny L. Blanchard (UAF: University of Alaska Fairbanks)H-Index: 22
#2Robert H. DayH-Index: 8
Last. Sheyna S. WisdomH-Index: 3
view all 10 authors...
Abstract Understanding influences of cumulative effects from multiple stressors in marine ecosystems requires an understanding of the sources for and scales of variability. A multidisciplinary ecosystem study in the offshore northeastern Chukchi Sea during 2008–2013 investigated the variability of the study area’s two adjacent sub-ecosystems: a pelagic system influenced by interannual and/or seasonal temporal variation at large, oceanographic (regional) scales, and a benthic-associated system mo...
4 CitationsSource
#1Genevieve Davis (University of Massachusetts Boston)H-Index: 3
#2Mark F. Baumgartner (WHOI: Woods Hole Oceanographic Institution)H-Index: 24
Last. Sofie M. Van Parijs (WHOI: Woods Hole Oceanographic Institution)H-Index: 16
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Given new distribution patterns of the endangered North Atlantic right whale (NARW; Eubalaena glacialis) population in recent years, an improved understanding of spatio-temporal movements are imperative for the conservation of this species. While so far visual data have provided most information on NARW movements, passive acoustic monitoring (PAM) was used in this study in order to better capture year-round NARW presence. This project used PAM data from 2004 to 2014 collected by 19 organizations...
14 CitationsSource
Beaked whales represent some of the least understood marine mammals worldwide with the movements and distribution of many species largely unknown. Around eastern Canada current knowledge is limited to the eastern Scotian shelf and northern bottlenose whales. The acoustic signals of the beaked whale species are recognizable and sufficiently unique to be candidates for passive acoustic monitoring. Thirteen deep-water recorders located along the shelf break off Eastern Canada from Bonnecamps Canyon...
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Particle motion sensors measure the vector component of the sound field. In underwater acoustics, they are used for studying the physics of the sound field, evaluating the potential effects of sound on fish, and defining the direction of arrival (DOA) of sound sources. Measuring the DOA in the vertical and horizontal plane allows two separate receivers to localize an acoustic source in three dimensions. In July 2013, we used two custom-built, real-time particle velocity acoustic recording system...
2 CitationsSource
Variations in calls or songs between areas are increasingly acknowledged as a way to assess stock structure. We present the results of an analysis of 163 fin whale (FW) songs recorded in seven areas of the North Atlantic (NA): Irminger Sea, Davis Strait, Grand Banks of Newfoundland, Southern Newfoundland, Gulf of St. Lawrence, eastern Scotian Shelf, and the waters off Delaware Bay. Song measurements included inter-note intervals (INI), notes' peak frequency and bandwidth and note type (classic, ...
1 CitationsSource
A long-term passive acoustic study in the Chukchi Sea monitors the bowhead whale (Balaena mysticetus) migration between their summering and wintering grounds in the Beaufort and Bering Seas, respectively. A hexagonal array offshore from Point Lay, AK was located near the center of their migratory corridor in the falls of 2009 through 2011. In 2012 however, there was a large difference in the number of acoustic detections across the array, with call counts close to three times higher in its north...
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