The deep scattering layer associated with the Endeavour Ridge hydrothermal plume

Thomson, Richard E.; Burd, Brenda J.; Dolling, Adrian G.; Gordon, Richard; Jamieson, Glen

doi:10.1016/0198-0149(92)90020-t

Cited by 46 publications

(18 citation statements)

References 12 publications

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“…One hypothesis that motivated this study was that fin whales might be found preferentially near the ridge axis to exploit the increased zooplankton biomass Thomson et al, 1992;Thomson, 1994, 1995). The track density plot (Fig.…”

Section: Spatial Distribution Of Fin Whalesmentioning

confidence: 99%

Fin whale tracks recorded by a seismic network on the Juan de Fuca Ridge, Northeast Pacific Ocean

Soule

Wilcock

2013

The Journal of the Acoustical Society of America

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Fin whale calls recorded from 2003 to 2004 by a seafloor seismic network on the Endeavour segment of the Juan de Fuca Ridge were analyzed to determine tracks and calling patterns. Over 150 tracks were obtained with a total duration of ~800 h and swimming speeds from 1 to 12 km/h. The dominant inter-pulse interval (IPI) is 24 s and the IPI patterns define 4 categories: a 25 s single IPI and 24/30 s dual IPI produced by single calling whales, a 24/13 s dual IPI interpreted as two calling whales, and an irregular IPI interpreted as groups of calling whales. There are also tracks in which the IPI switches between categories. Call rates vary seasonally with all the tracks between August and April. From August to October tracks are dominated by the irregular IPI and are predominantly headed to the northwest, suggesting that a portion of the fin whale population does not migrate south in the fall. The other IPI categories occur primarily from November to March. These tracks have slower swimming speeds, tend to meander, and are predominantly to the south. The distribution of fin whales around the network is non-random with more calls near the network and to the east and north.

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Section: Spatial Distribution Of Fin Whalesmentioning

confidence: 99%

Fin whale tracks recorded by a seismic network on the Juan de Fuca Ridge, Northeast Pacific Ocean

Soule

Wilcock

2013

The Journal of the Acoustical Society of America

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“…In previous microbiological studies, the methane oxidation rate was calculated by performing incubation experiments with plume water (8), manganese-containing microbial cells were observed with an electron microscope (7), and sulfur-oxidizing microbes and their activities were detected (20,32). Such microbial chemolithoautotrophic activities may play important roles in organic carbon production in deep oceans (20,28) or may occasionally enhance zooplankton aggregation around a plume (40).…”

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confidence: 99%

Two Bacteria Phylotypes Are Predominant in the Suiyo Seamount Hydrothermal Plume

Sunamura

Higashi

Miyako

et al. 2004

Appl Environ Microbiol

140

147

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Microbial diversity and populations in a hydrothermal plume that was present inside the caldera of the Suiyo Seamount, a submarine volcano on the Izu-Bonin Arc, were investigated by performing a phylogenetic analysis of the 16S rRNA gene and by using fluorescence in situ hybridization (FISH). Corresponding to transmissivity, an indicator of turbidity, the vertical total cell count as determined by 4,6-diamidino-2-phenylindole (DAPI) staining varied from 5.6 ؋ 10 4 to 1.1 ؋ 10 5 cells ml ؊1 , and the apparent plume layer was assessed to be at a depth of 1,050 to 1,200 m inside the caldera and to contain 1.0 ؋ 10 5 to 1.1 ؋ 10 5 cells ml ؊1 . From microbial samples collected in the plume by an in situ filtration system, the following two major phylogenetic groups, which were closely related to sulfur-oxidizing microbes, were obtained: the SUP05 group belonging to the gamma subclass of the Proteobacteria (13 of 20 clones) and the SUP01 group belonging to the epsilon subclass of the Proteobacteria (5 of 20 clones). Specific oligonucleotide probes for these groups (SUP05-187 and SUP01-63) were designed and were used with various water samples obtained from the Suiyo Seamount. In the apparent plume layer, up to 66% of the total counts of microbial cells were estimated to be Bacteria cells that hybridized to EUB338, and few cells were identified by the archaeal probe ARCH915. Almost all Bacteria cells were hard to identify with the known group-specific probes, such as ALF19, GAM42a, and CF319, while 88 to 90% of the Bacteria cells hybridized with SUP05-187 and >98% of them were considered members of the SUP05 and SUP01 populations. In a low-temperature vent fluid emitted from a bivalvecolonized mound, the SUP05 cells accounted for >99% of the Bacteria cells, suggesting that a portion of the plume cells originated on the surface of the seafloor at a depth of about 1,380 m. From further analysis of cell morphology (i.e., cell size and cell elongation index) we inferred that the SUP05 cells were active in the plume layer at a depth of 1,050 to 1,200 m compared to the activity in a near-bottom layer, while many elongated cells were found between these layers. These findings suggest that the morphology and distribution of SUP05 cells have complex relationships with hydrothermal activities and water circulation. Although growth and production rates remain to be defined, we concluded that this Suiyo Seamount caldera has functioned as a natural continuous incubator for these two phylotypes of Bacteria in an aphotic deep-sea environment.

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“…Subsequently, in June of 1990, we towed a five-net Tucker trawl with 1 mm mesh nets through the water column near Endeavour Segment, as well as some distance to the north and east of the main vent field, confirming that these acoustic anomalies matched zooplankton biomass patterns from nets (Burd et al, 1992;Thomson et al, 1992a). From 1991 onward, the sampling package and study were refined by:…”

mentioning

confidence: 80%

Estimating Zooplankton Biomass Distribution in the Water Column Near the Endeavour Segment of Juan de Fuca Ridge Using Acoustic Backscatter and Concurrently Towed Nets

Burd¹,

Thomson²

2012

oceanog

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The deep scattering layer associated with the Endeavour Ridge hydrothermal plume

Cited by 46 publications

References 12 publications

Fin whale tracks recorded by a seismic network on the Juan de Fuca Ridge, Northeast Pacific Ocean

Fin whale tracks recorded by a seismic network on the Juan de Fuca Ridge, Northeast Pacific Ocean

Two Bacteria Phylotypes Are Predominant in the Suiyo Seamount Hydrothermal Plume

Estimating Zooplankton Biomass Distribution in the Water Column Near the Endeavour Segment of Juan de Fuca Ridge Using Acoustic Backscatter and Concurrently Towed Nets

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