Improvement in municipal wastewater treatment alters lake nitrogen to phosphorus ratios in populated regions

Proceedings of the National Academy of Sciences, Journal Year: 2020, Volume and Issue: 117(21), P. 11566 - 11572

Published: May 8, 2020

Significance Due to different rates of change in total nitrogen (TN) and phosphorus (TP) concentrations lakes, increases TN/TP mass ratios were observed many China’s freshwater lakes during 2008 2017. This growing imbalance has important implications for aquatic ecology that remain poorly considered understood. Here, we show changes municipal wastewater treatment are a major driver lake ratios, as is more effectively removed than from wastewater. Our findings highlight the need efficient reduction addition reduce risk phytoplankton blooms toxin production maintain ecosystem biodiversity downstream waterbodies.

Language: Английский

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Kelp Forest Restoration in Australia

Frontiers in Marine Science, Journal Year: 2020, Volume and Issue: 7

Published: Feb. 14, 2020

Kelp forests dominate the rocky coasts of temperate Australia and are foundation Great Southern Reef. Much like terrestrial forests, these marine create complex habitat for diverse communities flora fauna. also support coastal food-webs valuable fisheries provide a suite additional ecosystem services. In many regions around world, kelp in decline due to ocean warming, overgrazing, pollution. One potential tool conservation management important ecosystems is restoration, science practice which currently undergoing substantial expansion. We summarise present state Australian emphasise that consideration initial drivers critical first step restoration. With focus on examples, we review methods, implementation outcomes forest discuss suitable measures success estimated costs restoration activities. propose workflow decision system identifies alternative pathways acknowledges under some circumstances at scale not possible or feasible. As case study, then apply Society Ecological Restoration's 5-star evaluation Operation Crayweed, Australia's primary example Overall, no single method all situations, but can be optimised by ameliorating driver(s) achieving ongoing natural recruitment kelp. Whilst scalability seascape-scale remains considerable challenge, should platform future efforts. However, it crucial challenges place high value preventative protection existing – prevention invariably better than cure.

Language: Английский

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Warming and Freshening of the Pacific Inflow to the Arctic From 1990‐2019 Implying Dramatic Shoaling in Pacific Winter Water Ventilation of the Arctic Water Column

Geophysical Research Letters, Journal Year: 2021, Volume and Issue: 48(9)

Published: April 12, 2021

Abstract The Pacific inflow to the Arctic traditionally brings heat in summer, melting sea ice; dense waters winter, refreshing Arctic’s cold halocline; and nutrients year‐round, supporting ecosystems. Bering Strait moorings from 1990 2019 find increasing (0.010 ± 0.006 Sv/yr) northward flow, reducing Chukchi residence times by ∼1.5 months over this period (record maximum/minimum ∼7.5 ∼4.5 months). Annual mean temperatures warm significantly (0.05 0.02°C/yr), with faster change (∼0.1°C/yr) warming (June/July) cooling (October/November) months, which are now 2°C 4°C above climatology. Warm (≥0°C) water duration increased 5.5 (the 1990s) 7 (2017), mostly due earlier (1.3 0.7 days/yr). Dramatic winter‐only (January–March) freshening (0.03 psu/yr) makes winter fresher than summer waters. resultant density change, too large be compensated sea‐ice processes, shoals Winter Water (PWW) equilibrium depth 100–150 50–100 m, implying PWW no longer ventilates halocline at 33.1 psu.

Language: Английский

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Climate change drives rapid warming and increasing heatwaves of lakes

Science Bulletin, Journal Year: 2023, Volume and Issue: 68(14), P. 1574 - 1584

Published: June 28, 2023

Language: Английский

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Widespread microbial mercury methylation genes in the global ocean

Environmental Microbiology Reports, Journal Year: 2020, Volume and Issue: 12(3), P. 277 - 287

Published: Feb. 24, 2020

Summary Methylmercury is a neurotoxin that bioaccumulates from seawater to high concentrations in marine fish, putting human and ecosystem health at risk. High methylmercury levels have been found the oxic subsurface waters of all oceans, but only anaerobic microorganisms shown efficiently produce anoxic environments. The microaerophilic nitrite‐oxidizing bacteria Nitrospina previously suggested as possible mercury methylating Antarctic sea ice. However, responsible for processing inorganic into remain unknown. Here, we show metagenomic metatranscriptomic evidence genetic potential microbial production widespread seawater. We find abundance expression key genes hgcAB across ocean basins, corresponding taxonomic relatives known Deltaproteobacteria , Firmicutes Chloroflexi . Our results identify predominant microorganism carrying actively expressing highest occurs global where MeHg are typically observed.

Language: Английский

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A global perspective on mercury cycling in the ocean

The Science of The Total Environment, Journal Year: 2019, Volume and Issue: 710, P. 136166 - 136166

Published: Dec. 18, 2019

Language: Английский

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Linking extracellular enzymes to phylogeny indicates a predominantly particle-associated lifestyle of deep-sea prokaryotes

Science Advances, Journal Year: 2020, Volume and Issue: 6(16)

Published: April 15, 2020

Heterotrophic prokaryotes express extracellular hydrolytic enzymes to cleave large organic molecules before taking up the hydrolyzed products. According foraging theory, should be cell associated in dilute systems such as deep sea habitats, but secreted into surrounding medium diffusion-limited systems. However, are found mainly dissolved ambient water rather than associated. In order resolve this paradox, we conducted a global survey of peptidases and carbohydrate-active (CAZymes), two key enzyme groups initiating matter assimilation, an integrated metagenomics, metatranscriptomics, metaproteomics approach. The abundance, percentage, diversity genes encoding secretory processes, i.e., enzymes, consistently increased from epipelagic bathypelagic waters, indicating that cleavage, hence prokaryotic metabolism, is mediated by particle-associated releasing their particles realm.

Language: Английский

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Fast and pervasive transcriptomic resilience and acclimation of extremely heat-tolerant coral holobionts from the northern Red Sea

Proceedings of the National Academy of Sciences, Journal Year: 2021, Volume and Issue: 118(19)

Published: May 3, 2021

Corals from the northern Red Sea and Gulf of Aqaba exhibit extreme thermal tolerance. To examine underlying gene expression dynamics, we exposed

Language: Английский

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Time-sequence development of metal(loid)s following the 2015 dam failure in the Doce river estuary, Brazil

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 769, P. 144532 - 144532

Published: Jan. 7, 2021

Language: Английский

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Environmental filtering dominates bacterioplankton community assembly in a highly urbanized estuarine ecosystem

Environmental Research, Journal Year: 2021, Volume and Issue: 196, P. 110934 - 110934

Published: Feb. 27, 2021

Language: Английский

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