The transition of a freshwater karst aquifer to an anoxic marine system

Garman, K. Michael; Garey, James R.

doi:10.1007/bf02732907

Cited by 16 publications

(2 citation statements)

References 9 publications

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“…Some distinctive biofilms are not directly associated with vents. For example, the walls of the sinkhole in the deepest part of the anoxic layer hosts grey finger-like Bacterial mats similar to those observed in Jewfish Sink [19]. Other parts of the anoxic layer contain long thin filamentous mats with a white coating.…”

Section: Hospital Hole: the Ecosystemmentioning

confidence: 74%

Microbial Function and Hydrochemistry within a Stratified Anchialine Sinkhole: A Window into Coastal Aquifer Interactions

Davis

Garey

2018

Water

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Anchialine sinkholes provide insight into coastal aquifer systems and coastal mixing processes. Aquifer microbial community function is usually inferred from hydrochemical information, but there are few direct studies of microbial communities in the Floridan Aquifer. Hospital Hole is a 43 m-deep stratified sinkhole under the Weeki Wachee River, FL, with three distinct brackish layers: a hypoxic layer, a chemocline and a sulfidic anoxic layer. Illumina sequencing and bioinformatic tools were used to reconstruct metabolic functions and interactions of microbial communities in each layer. Each layer appears to originate from different parts of the coastal mixing zone and has a distinct microbial community with unique functions, which are influenced by the respective hydrochemistry. Sulfide oxidation and nitrate reduction are the most abundant functions. Syntrophy between methane oxidizers, methanogens and sulfate reducers is present. Similarities between the hydrochemistry and potential connectivity of Hospital Hole and the Floridan Aquifer coastal mixing zone suggest that microbial communities of Hospital Hole could be a surrogate for the coastal mixing zone of the aquifer in the absence of direct studies. Understanding how groundwater microbial communities react to saltwater intrusion and nutrient flux will be useful in predicting how coastal aquifer regions might react to anthropogenic change.

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Section: Hospital Hole: the Ecosystemmentioning

confidence: 74%

Microbial Function and Hydrochemistry within a Stratified Anchialine Sinkhole: A Window into Coastal Aquifer Interactions

Davis

Garey

2018

Water

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“…Yakushev and Neretin, 1997) both of which can co-occur at very low but non-zero DO. In coastal karst environment in which seawater intrusion occurs, on the other hand, increased NO2 associated with decreased DO has been previously associated with the presence of deep karst conduits favouring the recirculation of seawater over large timescales (Garman and Garey, 2005). In such cases, nitrite levels are higher at the transition zone between low oxygen deep karst and surface karst waters (Garman and Garey, 2005).…”

Section: 52mentioning

confidence: 98%