Similar Oxygen Sensitivities of Different Steps of Denitrification in Estuarine Waters DOI
Weiyi Tang, Samantha G. Fortin, Naomi Intrator

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

Hypoxia is observed and projected to expand in many aquatic environments, largely due excess anthropogenic nutrient inputs climate change, thus influencing biogeochemical processes. Denitrification, generally an anaerobic process, removes bioavailable nitrogen produces nitrous oxide (N2O). However, limited observations of the effect oxygen on denitrification restrict our ability estimate changes amount N2O emissions under perturbations change. Here, we show that all steps increased, while production yield from decreased with decreasing Chesapeake Bay - largest estuary United States. The different responded similarly Bay, unlike open ocean minimum zones, implications for accumulation or depletion intermediates such as nitrite N2O. Our also suggest current model parametrizations likely overestimate removal presence oxygen, which would bias evaluation cycling, ecosystem productivity, extent hypoxia. Overall, newly derived sensitivities could be used improve constrain budget estuarine coastal environments experiencing

Language: Английский

Deciphering and quantifying nitrate sources and processes in the central Yellow Sea using dual isotopes of nitrate DOI
Xiaosong Zhong, Xiangbin Ran

Water Research, Journal Year: 2024, Volume and Issue: 261, P. 121995 - 121995

Published: June 24, 2024

Language: Английский

Citations

5
Nitrogen input modulates the effects of coastal acidification on nitrification and associated N2O emission DOI
Jie Zhou, Yanling Zheng, Lijun Hou

et al.

Water Research, Journal Year: 2024, Volume and Issue: 261, P. 122041 - 122041

Published: July 3, 2024

Language: Английский

Citations

5
Tracks of typhoon movement (left and right sides) control marine dynamics and eco-environment in the coastal bays after typhoons: A case study in Zhanjiang Bay DOI

Chunqing Chen,

Qibin Lao, Xin Zhou

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 168944 - 168944

Published: Dec. 1, 2023

Language: Английский

Citations

12
Shifts of abundance and community composition of nitrifying microbes along the Changjiang Estuary to the East China Sea DOI

Yongkai Chang,

Cheng Liu,

Zongxiao Zhang

et al.

World Journal of Microbiology and Biotechnology, Journal Year: 2025, Volume and Issue: 41(2)

Published: Jan. 20, 2025

Language: Английский

Citations

0
Bacterioplankton Community Structure and Its Relationship with Environmental Factors in the Coastal Waters Around the Changli Gold Coast National Nature Reserve in Northern China DOI Open Access

Jianyang Li,

Wenxuan Wu,

J. Shan

et al.

Water, Journal Year: 2025, Volume and Issue: 17(3), P. 311 - 311

Published: Jan. 23, 2025

Marine bacterioplankton perform a very important role in the cycles of carbon, nitrogen, phosphorus, and other elements coastal waters. The impacts environmental factors on bacterial community structure are dynamic ongoing. This study investigated spatiotemporal distributions their influences communities waters around Changli Gold Coast National Nature Reserve northern China. results demonstrate significant temporal variability carbon spring summer, influenced by natural anthropogenic activities. In spring, increased biological activity, particularly phytoplankton growth, may elevate TOC POC levels near river estuaries, while microbial decomposition likely stabilized concentrations. seasonal variation was obvious. Bacteroidetes were enriched samples Cyanobacteriota proliferated summer. dominated genera including Planktomarina, an unclassified NS5_marine_group (belonging to Flavobacteriaceae), OM43_clade (Methylophilaceae), showed positive correlation with salinity, TDP, TOC, POP, DO levels, Synechococcus_CC9902 (Synechococcus), PeM15_unclassified (Actinobacteria), HIMB11 (Rhodobacteraceae), which all dominate summer samples, significantly positively correlated TN, TDN, temperature, ammonium levels. particular, increase human activities inputs greatly improves nutrient promotes propagation photosynthetic microorganisms. These indicate that physical conditions affected changes activities, have effects bacterioplankton. highlights importance ongoing monitoring estuarine areas, especially protected areas like Reserve, manage eutrophication risks maintain ecological balance.

Language: Английский

Citations

0
Sandy Subterranean Estuaries Minimize Groundwater Nitrogen Pollution Impacts on Coastal Waters DOI Creative Commons
Xiaogang Chen, Isaac R. Santos, Jinzhou Du

et al.

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(3)

Published: Jan. 30, 2025

Abstract Widespread anthropogenic activities pollute groundwater that eventually seeps out to the coastal ocean. Here, we resolve nutrient transformations and fluxes in 11 sandy subterranean estuaries (STEs) with contrasting sources development trajectories. Coastal nitrogen pollution stems from sewage discharge land use change. Anthropogenically derived high N/P ratios (∼170) accounted for 22%–61% of riverine inputs into China's waters, providing an additional source nutrients can fuel eutrophication algal blooms. Sandy STEs remarkably attenuated ∼84% pollution, minimizing impact submarine (SGD) on water quality. Hence, deliver overlooked ecosystem service is particularly important highly polluted aquifers. Protecting recognizing integrated nature seawater thus quality management initiatives.

Language: Английский

Citations

0
Seaweed (Porphyra) cultivation enhances production of autochthonous refractory dissolved organic matter in coastal ecosystems DOI Creative Commons
Ting Wang, Jiajun Xu, Randy A. Dahlgren

et al.

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: Feb. 6, 2025

Seaweed cultivation contributes to coastal carbon sequestration making it a compelling strategy mitigate global climate change. Porphyra (commonly known as nori) is an economically important seaweed have high release rates for biogenic dissolved and particulate organic matter (DOM POM). However, the impact of on dynamics remains unclear. To fill this knowledge gap, we conducted investigations examining quantity optical properties DOM POM, microbial community structures relevant environmental factors along continuum from subtropical river through its adjacent zone during non-cultivation periods. Dissolved (DOC) concentration was significantly elevated versus period, while (POC) decreased, thereby resulting in higher DOC/POC ratio water column. Endmember mixing analysis further suggested that autochthonous dominated both periods, with limited inputs terrestrial carbon. Redundancy revealed more modules mediated transformations leading 169% estuarine addition microbially-sourced humic-like C3 compared period. Our findings demonstrate enhanced by promoting production transformation refractory DOM, which has implications sustainable management development blue strategies.

Language: Английский

Citations

0
Effects of riverine nutrient enrichment and sediment reduction on high primary productivity zone in the Yangtze River estuary: historical reconstruction and future perspective DOI Creative Commons
Yan Song,

Maotian Li,

Xiaoqiang Liu

et al.

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: March 3, 2025

The high primary productivity zone (HPPZ) of estuaries is known for its flourishing fisheries and active interactions with coastal oceanic ecosystems. However, the spatiotemporal patterns underlying mechanisms that regulate HPPZ remain unclear, especially in face drastic changes riverine inputs. Using 40 years situ monitoring data along Yangtze River estuary, evolution regulated by basin-estuarine-offshore flux fluctuations has been reconstructed past conclusions drawn future developments. Moreover, biological processes influence formation were explored within context estuarine filtration buffering effects. obtained dataset includes chlorophyll a (Chl-a) concentrations multiple environmental factors. results displayed characterized annual average Chl-a concentration 3.6 ± 2.4 μg/L, which driven sufficient light nutrient availability promote phytoplankton blooms. In contrast, inner turbidity exhibits an 1.0 0.7 primarily due to limited inhibiting growth. Meanwhile, outer lower zone, 0.9 1.1 from deficiencies limit Notably, synergistic effect sediment declines eutrophication resulted 6.5 μg/L increment HPPZ’s 3628 km² expansion area extent over years. This significant change attributed increase water transparency resulting reduction transported watershed sea, nitrogen phosphorus discharge. A projection, based on historical total suspended matter nutrients years, suggests will reach 10.5 projected 7,904 2050. study presents first quantification spatial range focusing interaction between materials. These findings offer deeper understanding managing ecological risks large estuaries.

Language: Английский

Citations

0
CO2 Dynamics and Sequestration Potential in High-Nutrient, Low-Chlorophyll Bays: A Case Study of Yueqing Bay DOI
Yixing Zhang, Bin Wang, Qian Li

et al.

Marine Environmental Research, Journal Year: 2025, Volume and Issue: 207, P. 107061 - 107061

Published: March 8, 2025

Language: Английский

Citations

0
Nutrient dynamics in the East China Sea: Seasonal changes, budget, and ecological impacts DOI
Xiaosong Zhong, Jiaming Liu,

Mengjiao Shi

et al.

Progress In Oceanography, Journal Year: 2025, Volume and Issue: unknown, P. 103463 - 103463

Published: March 1, 2025

Language: Английский

Citations

0