Remote sensing-driven machine learning models for spatiotemporal analysis of coastal phytoplankton blooms under climate change scenarios

Science of Remote Sensing, Journal Year: 2025, Volume and Issue: unknown, P. 100224 - 100224

Published: April 1, 2025

Language: Английский

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The Phytoplankton Community Exhibited Restored Species Diversity but Fragile Network Stability Under Potential Sustainable Aquaculture Approach of Marine Ranching

Journal of Marine Science and Engineering, Journal Year: 2025, Volume and Issue: 13(5), P. 835 - 835

Published: April 23, 2025

Mariculture is currently experiencing rapid growth in response to the rising global food demand, while simultaneously posing significant challenges environmental issues, such as pollution stress and ecological degradation. To achieve a balance between ecosystem maintenance seafood supply, marine ranching has flourished sustainable approach through implementation of artificial reef construction, stock enhancement, strategic releasing. However, few studies have evaluated impacts comparison situ survey data across geographical areas. Phytoplankton are vital organisms ecosystems that function essential indicators seawater quality biological diversity, reflecting health sustainability. In this study, we investigated species community structure, co-occurrence network phytoplankton based on 175 samples collected from 75 sites encompassing all 26 areas, along with their corresponding surrounding areas Yantai’s coastal sea. A total 112 were identified three phyla diatoms, dinoflagellates, chrysophytes; among them, diatoms dominated notably high proportion 98.83%. Their diversity structure exhibited variations different seasons geographic locations. Moreover, no preference was observed Nevertheless, analysis demonstrated lower values for average degree, clustering coefficient, path length ranching, indicating aquaculture activities reduced connectivity potential interactions. Additionally, it showed stability indicated by remaining nodes natural indices, regardless removed. These findings illustrate processes can mitigate losses maintaining they still alter association reduce overall stability. This research recommends scientifically informed expansion necessitates robust monitoring datasets systematic validation ensure holistic

Language: Английский

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Harmful algal blooms are preceded by a predictable and quantifiable shift in the oceanic microbiome

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: April 28, 2025

Harmful algal blooms (HABs) have become a worldwide environmental and human health problem, stressing the urgent need for reliable forecasting tool. Dynamic interactions between algae, including harmful bacteria play large role regulating water chemistry. Free-living quickly respond to small physical and/or chemical changes by adjusting their proteome. We hypothesize that this response is detectable at peptide level occurs before rapid phytoplankton growth characteristic of bloom events. To characterize microbiome's physiological preceding onset, we collected analyzed high-resolution metaproteomic time series free-living microbiome in coastal ecosystem. confirm twelve candidate HAB biomarkers are detectable, quantifiable, correlated across two pre-bloom periods. This study identifies proteomic shifts bacterial peptides which may be used as predictive initiation, potentially mitigating detrimental outcomes future.

Language: Английский

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Trace Metals in Phytoplankton: Requirements, Function, and Composition in Harmful Algal Blooms

Sustainability, Journal Year: 2024, Volume and Issue: 16(12), P. 4876 - 4876

Published: June 7, 2024

In a constantly changing environment brought about by the climate crisis and escalated anthropogenic perturbations driven growing population, harmful algal bloom dynamics their impacts are expected to shift, necessitating adaptive management strategies comprehensive research efforts. Similar primary productivity, HABs have been thought be primarily major nutrients such as N, P, Si. However, recent investigations on role importance of micronutrients limiting factors in aquatic environments highlighted. This paper provides review metal phytoplankton interactions, with specific emphasis pertinent information influence trace growth, toxin production, other underlying mechanisms related HABs. Low near-depleted levels essential nutrients, including Fe, Cu, Zn, Se, Mn, Co, Mo, negatively impact cell growth proliferation various marine freshwater HAB species. evidence shows that at elevated levels, these elements, along non-essential ones, could still cause toxic effects certain species manifested decreased photosynthetic activities, oxidative stress, ultrastructure damage, cyst formation. Interestingly, while metals mostly result increased Co (i.e., yessotoxins, gymnodimine, palytoxins) Mn isodomoic acid, okadaic diol esters) enrichments revealed otherwise. addition releasing dissolved organic matter (DOM), carbon (DOC) humic substances, was observed an adaptation strategy, since compounds proven chelate water column, thereby reducing metal-induced toxicity. Whilst current centers free toxicity elements Cu account how contribute metabolic processes under conditions reflective situ scenarios HAB-prone areas would yield new perspectives roles With demands global population for food security sustainability, substantial pressure is exerted agriculture aquaculture sector, highlighting need effective communication regarding interactions macro- improve existing policies practices.

Language: Английский

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Effect of temperature, salinity and nutrients on the growth and toxin content of the dinoflagellate Gymnodinium catenatum from the southwestern Mediterranean

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 945, P. 174094 - 174094

Published: June 19, 2024

Language: Английский

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Weak local upwelling may elevate the risks of harmful algal blooms and hypoxia in shallow waters during the warm season

Environmental Research Letters, Journal Year: 2023, Volume and Issue: 18(11), P. 114031 - 114031

Published: Oct. 11, 2023

Abstract Harmful algal blooms (HABs) and hypoxia, as common ecological disasters, are typically site-specific recurrent, causing enduring environmental problems for coastal communities. Although these issues often attributed to eutrophication, in certain low-nutrient areas, such disasters still frequently occur while the underlying cause is poorly understood. A prime example Qinhuangdao waters North China. This study intends investigate controlling factors of incongruous recurring those areas with a case Qinhuangdao, utilizing numerical models satellite observations. The result indicates that weak tide-induced upwelling during summer creates favorable conditions (warm water high transparency) occurrence HABs hypoxia this region. It due precisely situated at current amphidromic point semi-diurnal tides, characterized by tide mixing. Likewise, same story happens on northern shelf Shandong Peninsula, where also prominent present implies shallow local susceptible warm season. finding challenges traditional view strong-upwelling zones more vulnerable ample nutrient supply within euphotic layer. tidal dynamics can greatly affect vulnerability issues, which be significance management. Furthermore, may have broader global applicability, given ubiquity various other regions.

Language: Английский

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Composition and Distribution of Microeukaryotic Communities in the Surface Sediments of Five Geographic Regions of Bohai Sea Based on 18S rDNA Amplicon Sequencing

Journal of Marine Science and Engineering, Journal Year: 2024, Volume and Issue: 12(3), P. 410 - 410

Published: Feb. 26, 2024

The Bohai Sea is a semi-enclosed shallow water that influenced by both natural and anthropogenic stressors. However, the microeukaryotic communities environmental factors affect them in different regions remain largely unclear. We investigated surface sediments from five geographic using high-throughput sequencing of 18S rDNA gene. Miaodao Archipelago, Yellow River Estuary, Central had highest Shannon Simpson indices eukaryotic communities, while Estuary exhibited Chao1 index. were mainly composed Dinoflagellata, Bacillariophyta, Ciliophora, Cercozoa, Protalveolata. Thalassiosira has relatively high abundance at Liaodong Bay Sea, possessing proportion 41.70% 38.10%, respectively, Gonyaulax was most abundant taxa Bay, occupying 57.77%. Moreover, negative correlation between diatoms dinoflagellates observed. Phosphorus, nitrogen, salinity, temperature, silicate major determinants composition. Microeukaryotic sediments, especially for composition ratio to dinoflagellates, reflected quality marine ecosystems. Overall, these community compositions provide reliable indicator monitoring level eutrophication Sea.

Language: Английский

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Seasonal nutrients variation, eutrophication pattern, and Chlorophyll a response adjacent to Guangdong coastal water, China

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: Aug. 10, 2023

Nutrients were the key biogenic elements for primary production in coastal water, and increase of nutrient concentration led to eutrophication frequent occurrence harmful algal blooms. However, seasonal nutrients variation, pattern, Chlorophyll a (Chl- ) response adjacent Guangdong water still scarcely. In this study, clarity Chl- , spatiotemporal dissolved inorganic nitrogen (DIN) phosphorus (DIP) patterns explored by field observation using 52 stations waters Province during dry (April May), wet (July August) normal (October November) seasons 2020. The results showed that variability DIN DIP significantly different (P<0.01), mean concentrations 11.97 ± 28.12 μg/L, 25.84 35.72 μmol/L 0.59 0.71 μmol/L.Among them, value increased from 9.99 9.84 μg/L season 18.28 38.07 season, then decreased 7.65 27.64 season.The 30.68 43.58 21.91 35.45 24.91 26.12 season. 0.58 0.73 0.48 0.65 0.70 0.73μmol/L addition, at most monitoring met Grade II national seawater quality standards, only few fail meet IV standard. DIN/DIP ratios ranged 2.05 259.47, with an average 43.77 41.01, far exceeding Redfield ratio, indicating presence P limitation nearshore Province. Besides, EI values are higher 0.00 82.51, 4.16 10.90. positively correlated COD each (P<0.05). Moreover, positive correlations all high could be sustained supply marine ecosystems. Therefore, it is necessary strengthen integrated management land sea effectively mitigate regional estuarine

Language: Английский

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Prediction of hydrological and water quality data based on granular-ball rough set and k-nearest neighbor analysis

PLoS ONE, Journal Year: 2024, Volume and Issue: 19(2), P. e0298664 - e0298664

Published: Feb. 23, 2024

Hydrological and water quality datasets usually encompass a large number of characteristic variables, but not all these significantly influence analytical outcomes. Therefore, by wisely selecting feature variables with rich information content removing redundant features, it only can the analysis efficiency be improved, model complexity also simplified. This paper considers introducing granular-ball rough set algorithm for variable selection combining k-nearest neighbor method back propagation network to analyze hydrological data, thus promoting overall fused inspection. The results data show that proposed produces better compared using standalone regressor.

Language: Английский

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Typhoon-induced stormwater drives nutrient dynamics and triggers phytoplankton blooms in Laizhou Bay, China

Marine Environmental Research, Journal Year: 2024, Volume and Issue: 198, P. 106473 - 106473

Published: March 23, 2024

Language: Английский

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