Hydrothermal sediments are a source of water column Fe and Mn in the Bransfield Strait, Antarctica

Aquilina, Alfred; Homoky, William B.; Hawkes, Jeffrey A.; Lyons, Timothy W.; Mills, Rachel A.

doi:10.1016/j.gca.2014.04.003

Cited by 39 publications

(42 citation statements)

References 62 publications

(96 reference statements)

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“…Several origins have been reported for the iron and manganese oxides amorphous material. Among them, the organic activity has been invoked (Hill & Forti, 1997) or the leaching of manganese from residual material below bat guano, or from the soil under reducing conditions (Fairchild & Baker, 2012), or the supply of Fe and Mn by low-temperature hydrothermal fluids (Aquilina et al, 2014). The black coatings are also common in ponded flood waters deposited from highly oxidized waters carrying Mn ions from the solution of impure limestone (Ford & Williams, 2007).…”

Section: Discussionmentioning

confidence: 99%

Cave deposits and sedimentary processes in Cova des Pas de Vallgornera (Mallorca, Western Mediterranean)

Fornós¹,

Ginés²,

Gràcia³

et al. 2014

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Section: Discussionmentioning

confidence: 99%

Cave deposits and sedimentary processes in Cova des Pas de Vallgornera (Mallorca, Western Mediterranean)

Fornós¹,

Ginés²,

Gràcia³

et al. 2014

IJS

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“…Samples were collected during RRS James Cook cruise JC55 in the austral summer of 2011 (Tyler et al, 2011) from three raised edifices along the basin axis (Hook Ridge, the Three Low activity (9 cm yr −1 ) Aquilina et al (2013Aquilina et al ( , 2014, Hook Ridge 2 (HR2) 1054…”

Section: Sites and Samplingmentioning

confidence: 99%

“…We visited two sites of variable hydrothermal activity (Hook Ridge 1 and 2) and three sites where hydrothermal activity was not detected (Three Sisters, the Axe, and an off-axis site; Aquilina et al, 2013). Of the two hydrothermal sites, Hook Ridge 2 had higher fluid advection rates and pore fluid temperature but lower concentrations of sulfide and methane (Dählmann et al, 2001;Aquilina et al, 2013Aquilina et al, , 2014. Samples were collected with a Bowers and Connelly dampened megacorer (1024-1311 m of depth) and a single Agassiz trawl at Hook Ridge (1647 m of depth).…”

Section: Sites and Samplingmentioning

confidence: 99%

Hydrothermal activity lowers trophic diversity in Antarctic hydrothermal sediments

et al. 2017

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Abstract. Hydrothermal sediments are those in which hydrothermal fluid is discharged through sediments and are one of the least studied deep-sea ecosystems. We present a combination of microbial and biochemical data to assess trophodynamics between and within hydrothermal and background areas of the Bransfield Strait (1050-1647 m of depth). Microbial composition, biomass, and fatty acid signatures varied widely between and within hydrothermally active and background sites, providing evidence of diverse metabolic activity. Several species had different feeding strategies and trophic positions between hydrothermally active and inactive areas, and the stable isotope values of consumers were not consistent with feeding morphology. Niche area and the diversity of microbial fatty acids was lowest at the most hydrothermally active site, reflecting trends in species diversity. Faunal uptake of chemosynthetically produced organics was relatively limited but was detected at both hydrothermal and non-hydrothermal sites, potentially suggesting that hydrothermal activity can affect trophodynamics over a much wider area than previously thought.

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“…Unless otherwise Position reported as degrees and decimal minutes. Geochemical data and hydrothermal flux rates from published literature (Aquilina et al, 2013(Aquilina et al, , 2014.…”

Section: Statistical Analysesmentioning

confidence: 99%

Macrofaunal Ecology of Sedimented Hydrothermal Vents in the Bransfield Strait, Antarctica

et al. 2016

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Sedimented hydrothermal vents, where hot, mineral-rich water flows through sediment, are poorly understood globally, both in their distribution and the ecology of individual vent fields. We explored macrofaunal community ecology at a sediment-hosted hydrothermal vent in the Southern Ocean. This is the first such study of these ecosystems outside of the Pacific and the furthest south (62 • S) of any vent system studied. Sedimentary fauna were sampled in four areas of the Bransfield Strait (Southern Ocean), with the aim of contrasting community structure between vent and non-vent sites. Macrofaunal assemblages were clearly distinct between vent and non-vent sites, and diversity, richness, and density declined toward maximum hydrothermal activity. This variation is in contrast to observations from similar systems in the Pacific and demonstrates the influence of factors other than chemosynthetic primary productivity in structuring infauna at deep-sea vent communities. Vent endemic fauna had limited abundance and were represented by a single siboglinid species at hydrothermally active areas, meaning that that the majority of local biota were those also found in other areas. Several taxa occupied all sampling stations but there were large differences in their relative abundances, suggesting communities were structured by niche variation rather than dispersal ability.

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Hydrothermal sediments are a source of water column Fe and Mn in the Bransfield Strait, Antarctica

Cited by 39 publications

References 62 publications

Cave deposits and sedimentary processes in Cova des Pas de Vallgornera (Mallorca, Western Mediterranean)

Cave deposits and sedimentary processes in Cova des Pas de Vallgornera (Mallorca, Western Mediterranean)

Hydrothermal activity lowers trophic diversity in Antarctic hydrothermal sediments

Macrofaunal Ecology of Sedimented Hydrothermal Vents in the Bransfield Strait, Antarctica

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