Variations in the number of fin whale calls recorded at different locations in the Northeast Pacific Ocean.

Weirathmueller, Michelle; Soule, D. C.; Wilcock, William S. D.

doi:10.1121/1.3588779

Cited by 4 publications

(6 citation statements)

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“…The hypothesis that baleen-whales feeding in the upper ocean may be concentrated in regions of hydrothermal venting (see Weirathmueller et al, 2011) is extremely difficult to prove because of the wide ranging territories of these animals and the limitation of their diving to the upper part of the ocean. It appears that secondary production is higher in summer near the vents than offaxis, and this may be attracting larger consumers, even possibly whales.…”

Section: Implications For Higher Trophic Level Productionmentioning

confidence: 99%

“…Based on moored seismic array data, Soule and Wilcock (2013) have suggested that some of the fin whales found near Endeavour Ridge do not migrate south in the fall. In addition, the highest concentration of fin whale vocalizations near the ridge is observed in the winter months (Wilcock et al, 2009;Weirathmueller et al, 2011). Acoustic tracking of whale calls through the Endeavour Ridge seismic network (Wilcock et al, 2009;Wilcock, 2012) indicates that observed data gaps of tens of minutes when the whales stop vocalizing occur preferentially above the ridge.…”

Section: Implications For Higher Trophic Level Productionmentioning

confidence: 99%

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The importance of hydrothermal venting to water-column secondary production in the northeast Pacific

Burd¹,

Thomson

2015

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tThe purpose of this study is to show that seafloor hydrothermal venting in the open northeast Pacific Ocean has a marked impact on secondary biomass and production within the overlying water column. Specifically, we use net tows and concurrently measured acoustic backscatter data collected over six summers to examine the effects of hydrothermal venting from the Endeavour Segment of Juan de Fuca Ridge on macro-zooplankton biomass and production throughout the entire 2000 m depth range. Previous research shows that ontogenetic diapausing migrators and their predators from the upper ocean aggregate above the neutrally buoyant plumes in summer and resume feeding on plume and bottom upwelled particles, resulting in increased zooplankton reproductive output to the upper ocean. Within the limitations of our sampling methodology, net tows reveal a statistically significant exponential decline in total water-column biomass with increasing lateral distance from the vent fields. The acoustic backscatter data show a similar decline, but only below 800 m depth. Near-surface biomass was highly variable throughout the region, but values near vents consistently ranged higher than summer values found elsewhere in the offshore northeast Pacific. Water-column biomass was similar in magnitude above and below 800 m depth throughout the region. Because epiplume biomass can be advected a considerable distance from vent fields, biomass enhancement of the water column from hydrothermal venting may extend considerable distances to the west and northwest of the vent sites, in the prevailing directions of the subsurface flow. Based on the extensive acoustic Doppler current profiler (ADCP) data collected, and the strong correlation between zooplankton production derived from net sample biomass and acoustic backscatter intensity, we estimate that daily macro-zooplankton production in the upper 400 m of the water column within 10 km of the vent fields averages approximately 16% of photosynthetic primary production (the "Z ratio"), whereas the total water-column zooplankton production averages 26% of surface primary production. Local grazing-rate estimates, metabolic constraints and other open-ocean studies suggest that the Z ratio should be no higher than 5%, which it is at off-axis background sites in the study region. This finding indicates that nutrient sources other than upper-ocean primary production fuel both upper-and deep-ocean zooplankton biomass and growth near the Endeavour Ridge hydrothermal vents.

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Section: Implications For Higher Trophic Level Productionmentioning

confidence: 99%

Section: Implications For Higher Trophic Level Productionmentioning

confidence: 99%

The importance of hydrothermal venting to water-column secondary production in the northeast Pacific

Burd¹,

Thomson

2015

Deep Sea Research Part II: Topical Studies in Oceanography

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“…In previous reporting periods, we evaluated two automated methods to detect fin calls using matched filters and spectral cross-correlation (Weirathmueller et al, 2011) and obtained call counts normalized to a uniform background noise level for sites on the Endeavour ridge, Nootka fault and middle of the Explorer and Juan de Fuca plates ( Fig. 1).…”

Section: Whale Call Densitiesmentioning

confidence: 99%

Continuing Investigations of the Relationship Between Fin Whales, Zooplankton Concentrations and Hydrothermal Venting on the Juan De Fuca Ridge

Wilcock¹,

Thomson²

2013

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Award Number: N00014-08-1-0523 http://gore.ocean.washington.edu LONG-TERM GOALSWe are investigating the potential correlation between fin whale tracks, enhanced zooplankton concentrations and hydrothermal vents above the Juan de Fuca Ridge. Our goal is to understand the influences of globally distributed hydrothermal plumes on the trophic ecology of the deep ocean. OBJECTIVESWe are continuing a study of seismic and bio-acoustical data sets from the Juan de Fuca Ridge with the following three objectives:1. Complete the detailed analysis of a data set of several hundred thousand fin whale calls recorded on the Endeavour segment over a 3-year period from 2003-2006. 2. Estimate the density of calling fin whales above ocean bottom seismometers deployed at mid-plate locations on the Explorer and Juan de Fuca plates and near the continental margin in order to test whether the density of vocalizing fin whales is unusually high around the Endeavour vent fields.3. Complete the calibration of Acoustic Doppler Current Profiler (ADCP) backscatter intensities in terms of biomass and apply the results to historical and NEPTUNE Canada ADCP data to understand the relationship between the seasonal migration patterns of zooplankton and their enhanced concentrations within the water column above the hydrothermal vents.

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“…Whale Call Densities. In previous reporting periods, we evaluated two automated methods to detect fin calls using matched filters and spectral cross-correlation (Weirathmueller et al, 2011) and obtained call counts normalized to a uniform background noise level for sites on the Endeavour ridge, Nootka fault and middle of the Explorer and Juan de Fuca plates (Fig. 1).…”

Section: Work Completedmentioning

confidence: 99%

Continuing Investigations of the Relationship between Fin Whales, Zooplankton Concentrations and Hydrothermal Venting on the Juan de Fuca Ridge

Wilcock¹,

Thomson²

2012

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Variations in the number of fin whale calls recorded at different locations in the Northeast Pacific Ocean.

Cited by 4 publications

References 0 publications

The importance of hydrothermal venting to water-column secondary production in the northeast Pacific

The importance of hydrothermal venting to water-column secondary production in the northeast Pacific

Continuing Investigations of the Relationship Between Fin Whales, Zooplankton Concentrations and Hydrothermal Venting on the Juan De Fuca Ridge

Continuing Investigations of the Relationship between Fin Whales, Zooplankton Concentrations and Hydrothermal Venting on the Juan de Fuca Ridge

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