Microbial community composition across a coastal hydrological system affected by submarine groundwater discharge (SGD)

PLoS ONE, Journal Year: 2020, Volume and Issue: 15(6), P. e0235235 - e0235235

Published: June 29, 2020

Mobile Bay, the fourth largest estuary in USA located northern Gulf of Mexico, is known for extreme hypoxia water column during dry season caused by NH4+-rich and anoxic submarine groundwater discharge (SGD). Nutrient dynamics coastal ecosystem point to potentially elevated microbial activities; however, little about community composition their functional roles this area. In study, we investigated composition, distribution, metabolic prediction along hydrological compartment Bay using 16S rRNA gene sequencing. We collected samples from surface (river bay water) subsurface (groundwater pore two SGD sites with peat sandy lithology, respectively). Salinity was identified as primary factor affecting distribution communities across samples, while DON PO43- were major predictor shift within samples. Higher diversity found comparison Gammaproteobacteria, Bacteroidia, Oxyphotobacteria dominated bacterial community. Among archaea, methanogens prevalent peat-dominated site, site characterized a higher proportion ammonia-oxidizing archaea. Cyanobium PCC-6307 unclassified Thermodesulfovibrionia dominant taxa strongly associated trends environmental parameters respectively. Microbial layer consisted denitrification dissimilatory nitrate reduction ammonium (DNRA). This finding suggested that might also play significant role mediating nitrogen transformation flow path chemical discharging column. Given ecological importance microorganisms, further studies at taxonomic resolution are needed accurately predict biotransformation processes continuum, which influence quality condition Bay.

Language: Английский

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The connection between Submarine Groundwater Discharge and seawater quality: The threat of treated wastewater injected into coastal aquifers

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 922, P. 170940 - 170940

Published: Feb. 14, 2024

Submarine Groundwater Discharge (SGD) delivers nutrients to the coastal sea triggering phytoplankton blooms, eutrophication, and can also serve as a pathway for contaminants. Wastewater treatment plants (WWTP) including injection wells in areas influence aquifers might impact composition magnitude of SGD fluxes. In tourist areas, wastewater may be less efficient larger volume during high seasons, potentially impacting nutrient fluxes from exacerbating environmental impacts. This study analyzes transfer treated karstic via SGD, considering impacts tourism seasonality. is conducted Cala Deià, small cove Balearic Islands, Mediterranean destination. The findings suggest that seasonality tourism, leading variations WWTP, influences dynamics aquifer. leads increased water summer, i.e. peak season. measured DIN, DIP, DSi inventories are much August than April (3, 10, 1.5 times higher, respectively) due higher input summer impacted by WWTP. These elevated flows support algal blooms cove, compromising quality local swimmers tourists. Indeed, August, shoreline stations exhibited eutrophic Chl-a concentrations, with peaks reaching approximately 4 mg L−1. levels presence an bloom survey. anthropogenic origin SGD-driven traced seawater seagrass meadows, evidenced ∂15N signatures indicative polluted areas. Thus, pressure exerted on activities fluxes, thereby threatening ecosystems services they provide.

Language: Английский

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Nitrogen enrichment and speciation in a coral reef lagoon driven by groundwater inputs of bird guano

Journal of Geophysical Research Oceans, Journal Year: 2017, Volume and Issue: 122(9), P. 7218 - 7236

Published: Aug. 3, 2017

Abstract While the influence of river inputs on coral reef biogeochemistry has been investigated, there is limited information nutrient fluxes related to submarine groundwater discharge (SGD). Here, we investigate whether significant saline groundwater‐derived from bird guano drive photosynthesis and calcification off Heron Island (Great Barrier Reef, Australia). We used multiple experimental approaches including sampling, beach face transects, detailed time series observations assess dynamics speciation nutrients as they travel across island into lagoon. Nitrogen shifted nitrate‐dominated (>90% total dissolved nitrogen) a lagoon dominated by organic nitrogen (DON; ∼86%). There was minimum input nitrate 2.1 mmol m −2 d −1 tidally driven estimated radon mass balance model. An independent approach based enrichment during isolation at low tide implied 5.4 . A correlation observed between daytime net ecosystem production calcification. suggest that derived may offer addition oligotrophic lagoons fuel productivity coastal carbon cycle near Island. The large in serve natural ecological analogue other reefs subject anthropogenic sources.

Language: Английский

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Seasonal variability of land-ocean groundwater nutrient fluxes from a tropical karstic region (southern Java, Indonesia)

Journal of Hydrology, Journal Year: 2018, Volume and Issue: 565, P. 662 - 671

Published: Aug. 31, 2018

Language: Английский

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Remobilization of dissolved metals from a coastal mine tailing deposit driven by groundwater discharge and porewater exchange

The Science of The Total Environment, Journal Year: 2019, Volume and Issue: 688, P. 1359 - 1372

Published: June 20, 2019

Language: Английский

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