Comparison of the groundwater microbial community in a salt-freshwater mixing zone during the dry and wet seasons

Chen, Lin; Zhang, Jin; Dai, Heng; Hu, Bill X.; Tong, Jinnan; GUI, Dongwei; Zhang, Xiaoying; Xia, Chuan‐An

doi:10.1016/j.jenvman.2020.110969

Cited by 28 publications

(13 citation statements)

References 73 publications

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“…1), which suggested that seawater intrusion was aggravated during dry season (January). Owing to heavy rainfall during monsoon season (represented by September samples), the recharge rates were considerably high in most coastal aquifers with a high groundwater table, which raises the freshwater level in coastal aquifers and restricts intrusion of seawater [7,40]. Environmental stresses including salt stress are considered as major drivers of microbial community diversity [41,42].…”

Section: Diversity and Composition Of Bacterial Communitymentioning

confidence: 99%

“…The results of this study can provide a reference for exploring new microbial indicators of seawater intrusion. For example, seasonal variations in microbial interactions could be applied to characterize the degree of seawater intrusion [7]. Order Oceanospirillales and family Alteromonadaceae have already been suggested as indicators of seawater intrusion [43].…”

Section: Bacterial Community Application In Seawater Intrusionmentioning

confidence: 99%

“…Moreover, saltwater intrusion caused the salinization of groundwater and agricultural soil, which resulted in increasing the risk of hypertension and cardiovascular diseases of human beings because of the high salt intake [6][7][8]. Currently, many countries around the world are suffering from ill effects of seawater intrusion, including France [9], America [10], Australia [11], China [12], Italy [13], Tunisia [14], the United Arab Emirates [15], Bangladesh [16].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, many countries around the world are suffering from ill effects of seawater intrusion, including France [9], America [10], Australia [11], China [12], Italy [13], Tunisia [14], the United Arab Emirates [15], Bangladesh [16]. Hence, cost-e cient strategies for monitoring and controlling seawater intrusion should be implemented to prevent freshwater quality deterioration [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bacterial Communities of Sediments in a Seawater-Freshwater Transition Zone During the Wet and Dry Seasons in Pearl River Estuary

Huang

Sun

et al. 2021

Preprint

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Seawater intrusion has a detrimental effect on agriculture, industry and human health. One question of particular interest is how the microbial community responds to and reflects seawater intrusion with seasonal variation. The current study explored the seasonal changes in bacterial community composition and interaction in the vicinity of Pearl River Estuary in January (dry season) and September (wet seasons). Results indicated that the salinity (expressed as electrical conductivity value) of sediment samples obtained in dry season was higher than that in wet season. The salt stress induced a declined alpha diversity but resulted in a loosely connected and unstable biotic interaction network in the bacterial communities. Random forest prediction and redundancy analysis of bacterial community indicated that salinity substantially affected the bacterial communities. Multiple lines of evidence, including the enrichment of bacterial taxa in the high-salinity location, microbe-microbe interactions, environment-microbe interactions, and machine learning approach, demonstrated that the families Moraxellaceae and Planococcaceae were the keystone taxa and were resistant to salt stress, which suggested that both of them can be used as potential biological indicators of monitoring and controlling seawater intrusion in coastal zone areas.

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Section: Diversity and Composition Of Bacterial Communitymentioning

confidence: 99%

Section: Bacterial Community Application In Seawater Intrusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bacterial Communities of Sediments in a Seawater-Freshwater Transition Zone During the Wet and Dry Seasons in Pearl River Estuary

Huang

Sun

et al. 2021

Preprint

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“…Instead, deterministic processes and ecological relationships can be interactively and topologically explored in a microbial co-occurrence or molecular ecological network, which is fundamental for predicting microbial species interactions and niche patterns in both natural [29, 30] and engineered [31-33] ecosystems. Previous studies have reported that enhanced seawater intrusion weakened the complexity of microbial co-occurrence associations in intertidal sediment [24], whereas it strengthened microbial interactions and led to more compact microbial networks in groundwater [10]. However, microbial co-occurrence patterns in the intertidal GW-SW continuum and their dynamics under regular hydrodynamic disturbance (e.g., periodic tidal fluctuations) and increasing anthropogenic impacts (e.g., land-sourced pollutants) are almost blank.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic and anthropogenic disturbances co-shape microbiota rhythmicity and community assembly within intertidal groundwater-surface water continuum

Zhao

Zhang

et al. 2022

Preprint

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Tidal hydrodynamics drive the groundwater-seawater exchange and shifts in microbiota structure in the coastal zone. However, how microbiota structure responds to periodic tidal fluctuations and anthropogenic disturbance is seldom evaluated in the intertidal groundwater-surface water (GW-SW) continuum, although it affects microbially driven biogeochemical cycles and ecosystem function therein. Here, we resolved the high-resolution spatiotemporal dynamics and assembly mechanisms along a GW-SW continuum in the natural tidal creek. Our results revealed an evident rhythmic pattern of microbiota structure in response to daily and monthly tidal fluctuations in intertidal surface water. The similarity in archaeal community structures among groundwater and ebb-tide surface water demonstrated archaeal transport through groundwater discharge, whereas multi-source transport mechanisms led to the occurrence of unique bacterial biota in ebb-tide water. Mechanistically, homogeneous selection (58.6%-69.3%) dominated microbiota assembly patterns in the intertidal GW-SW continuum, while biotic interactions were weaker in the groundwater microbiota than the surface water microbiota. Compared with the natural tidal creek, we found that microbiota biodiversity and community succession in intertidal groundwater under anthropogenic-induced terrestrial nutrient inputs and weakened tidal fluctuations were primarily controlled by increased dispersal limitation and consequent weakening of homogeneous selection, as well as enhanced biotic interactions. Overall, this study sheds light on the ecological rules guiding water microbiota assembly in the coastal transition zones and highlights periodic hydrodynamic and anthropogenic disturbances as prominent influencing factors of the microbiota structure, as well as the potential for enhancing coastal monitoring initiatives by incorporating only a few rhythmic but critical key microbial observations.

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Zooplankton grazing reduces the persistence of an anthropogenic pollution marker in lake water

Borgomaneiro,

Di Cesare,

Callieri

et al. 2024

Limnology & Oceanography

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Wastewater treatment plant effluents release microbiological pollutants, including the intI1 gene (integrases of class 1 integron), which has been proposed as a target for monitoring anthropogenic pollution in surface waters. This gene correlates with antibiotic resistance genes, making it an important proxy for genetic contamination in aquatic environments. It is currently unclear whether intI1 found in lake water is mainly present due to continuous seeding or if autochthonous bacteria harbor this gene. To better understand the fate and dynamics of class 1 integrons in aquatic systems, we resorted to classical limnological monitoring of intI1 (qPCR) over multiple years in three different size fractions: free‐living bacteria, particle‐attached bacteria, and zooplankton‐attached bacteria. We also conducted experiments to elucidate the impact of grazers on the abundance of intI1. The monitoring of different size fractions of the Lake Maggiore microbial community showed a particle‐bound lifestyle for intI1‐hosting bacteria. Most of these bacteria originated from both a wastewater effluent that discharges into Lake Maggiore and the lake water itself (amplicon sequencing). We hypothesize that these bacteria grow on particles in open waters, making them particularly vulnerable to grazing by large filter feeders such as Daphnia. Therefore, the presence of Daphnia reduced the abundance of intI1 in lake water, whereas this was not true for other grazers such as Rotaria macrura or Poterioochromonas sp. Our study shows that the food web structure and temporal changes in the lake influence the abundance of intI1 and consequently the assessment of anthropogenic pollution.

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Comparison of the groundwater microbial community in a salt-freshwater mixing zone during the dry and wet seasons

Cited by 28 publications

References 73 publications

Bacterial Communities of Sediments in a Seawater-Freshwater Transition Zone During the Wet and Dry Seasons in Pearl River Estuary

Bacterial Communities of Sediments in a Seawater-Freshwater Transition Zone During the Wet and Dry Seasons in Pearl River Estuary

Hydrodynamic and anthropogenic disturbances co-shape microbiota rhythmicity and community assembly within intertidal groundwater-surface water continuum

Zooplankton grazing reduces the persistence of an anthropogenic pollution marker in lake water

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