Science of the Total Environment最新文献_第7页

First evidence of elemental accumulation patterns in the hard tick Dermacentor reticulatus exoskeleton using EDS analysis: Insights into bioindicator potential across diverse habitats in Poland and Ukraine 使用EDS分析的硬蜱网纹革蜱外骨骼元素积累模式的第一个证据：对波兰和乌克兰不同栖息地生物指标潜力的见解

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-07 DOI: 10.1016/j.scitotenv.2025.181335

Kateryna Slivinska , Vitalii Demeshkant , Magdalena Zyzak , Grzegorz Karbowiak

Hard ticks are significant disease vectors whose chitinous exoskeletons possess pollutant-absorbing properties. Due to their high trophic position, ticks bioaccumulate persistent toxins, yet this process remains unexplored. This study investigated the exoskeletal chemical composition of Dermacentor reticulatus using SEM-EDS, focusing on metabolic elements and environmental pollutants (including Cd, Al, Sr, Cs, Ca, K, Fe, Ni, Co, Pb, Hg, and Cr). This approach enables precise analysis of biological structures, providing new insights into pollutant accumulation in arthropods. Ticks were analysed from three sampling locations representing contrasting environmental profiles: the urban area of Warsaw (5♂/5♀), the rural area of Kosewo Górne (0♂/10♀) (Poland), and the radionuclide-contaminated Chornobyl area (5♂/5♀) (Ukraine). Regional and biological variations, including differences across exoskeleton zones and between sexes, were also examined. The results revealed regional differences in the chemical composition of tick exoskeletons. Ticks from the Chornobyl exhibited lower concentrations of heavy metals, such as Fe, Co, and Ni (1.98, 0.60, and 0.61 wt%, respectively), compared to those from Kosewo Górne (2.62, 0.79, and 0.74 wt%, respectively). Furthermore, significant variability was identified across anatomical zones; notably, statistically significant differences in Fe concentration were found within zone 3 of CEZ ticks, while the lowest concentrations of Cs (p = 0.0052) and Ca (p = 0.0039) were recorded in zone 2 across all locations. Significant sex-based differences in the occurrence of specific elements were identified in ticks from all study locations. This study provides the first evidence of variability in the accumulation of selected elements across D. reticulatus tick exoskeleton. These findings establish a foundation for further research into the influence of environmental pollutants on tick physiology and vector competence, offering potential for a more comprehensive characterization of exoskeleton composition and its functional implications. These patterns suggest D. reticulatus exoskeletons may serve as sensitive bioindicators of environmental pollution across diverse habitats.

硬蜱是重要的病媒，其壳质外骨骼具有吸附污染物的特性。由于它们的高营养地位，蜱生物积累持久性毒素，但这一过程仍未被探索。本研究利用扫描电镜能谱仪（SEM-EDS）研究了网状革螨的外骨骼化学成分，重点研究了代谢元素和环境污染物（包括Cd、Al、Sr、Cs、Ca、K、Fe、Ni、Co、Pb、Hg和Cr）。这种方法可以精确分析生物结构，为节肢动物的污染物积累提供新的见解。蜱虫来自华沙市区（5♂/5♀）、波兰科塞沃Górne农村地区（0♂/10♀）和乌克兰放射性核素污染的切尔诺贝利地区（5♂/5♀）三个不同环境特征的采样点。区域和生物差异，包括外骨骼区域和性别之间的差异，也进行了研究。结果揭示了蜱外骨骼化学成分的区域差异。与来自Kosewo Górne的蜱（分别为2.62、0.79和0.74 wt%）相比，来自切尔诺贝利的蜱表现出较低的重金属浓度，如Fe、Co和Ni（分别为1.98、0.60和0.61 wt%）。此外，在解剖区域中发现了显著的变异性；CEZ蜱3区铁浓度差异有统计学意义，2区Cs （p = 0.0052）和Ca （p = 0.0039）浓度最低。在所有研究地点的蜱虫中发现了特定元素发生的显著性别差异。本研究首次提供了网纹蜱外骨骼中所选元素积累变异性的证据。这些发现为进一步研究环境污染物对蜱生理和媒介能力的影响奠定了基础，为更全面地表征外骨骼组成及其功能意义提供了可能。这些模式提示网纹瓢虫外骨骼可作为不同生境环境污染的敏感生物指标。

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引用次数: 0

Two decades of flood-pulse-driven chlorophyll-a dynamics in an Amazon floodplain lake 亚马逊河漫滩湖泊20年洪水脉冲驱动的叶绿素-a动态

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-07 DOI: 10.1016/j.scitotenv.2025.181341

Ana Clara de Lara Maia , Anna Beatriz Silva Alves , Hulair Braga Carneiro , Lucas de Oliveira Arice , Nathalia Moraes Desani , Raiane Helena da Silva Santos , José Roberto Mantovani , Yasmim Carvalho Guimarães , Thanan Rodrigues , Deepak R. Mishra , Edward Park , Enner Alcântara

Amazonian floodplain lakes rank among the most dynamic aquatic ecosystems globally, yet their monitoring is hampered by extreme hydrological variability, high turbidity, and optical complexity. We investigated chlorophyll-a (Chl-a) dynamics in Lago Grande de Curuai, a large floodplain lake hydraulically connected to the Amazon River, by integrating multi-campaign in situ measurements with two decades of MODIS surface reflectance (2001–2024) within a machine learning and Explainable Artificial Intelligence (XAI) framework. Among tested regressors, an optimized Support Vector Regression (SVR_Optuna) consistently outperformed Random Forest, XGBoost, LightGBM, Partial Least Squares, and linear models, achieving R² = 0.855 in log1p space and RMSE = 12.5 mg m⁻³ after back-transformation in holdout validation. Applied to MODIS monthly composites, the model reconstructed 24 years of Chl-a variability, revealing recurrent seasonal maxima during receding and low-water phases of the Amazon flood pulse. Spatial analyses highlighted enhanced concentrations in semi-isolated basins and stronger dilution near riverine connections. Pixel-wise uncertainty metrics—derived from temporal variability, bootstrap resampling, and climatological anomalies—indicated robust retrievals in pelagic zones but higher uncertainty along river–lake interfaces. SHAP-based XAI confirmed the dominant role of red and red-edge spectral features (665–709 nm) in Chl-a prediction, consistent with bio-optical theory and strengthening model interpretability. Beyond Curuai, this scalable approach enables systematic monitoring of floodplain lakes across the Amazon Basin, where hydrological connectivity, extreme droughts, and intensifying human pressures increasingly affect water quality.

亚马逊河漫滩湖泊是全球最具活力的水生生态系统之一，但它们的监测受到极端水文变化、高浊度和光学复杂性的阻碍。在机器学习和可解释人工智能（XAI）框架下，通过将多运动现场测量数据与二十年的MODIS表面反射率（2001-2024）相结合，研究了与亚马逊河相连的大型洪泛平原湖泊Lago Grande de Curuai的叶绿素-a （Chl-a）动态。在测试的回归模型中，优化的支持向量回归（SVR_Optuna）始终优于随机森林模型、XGBoost模型、LightGBM模型、偏最小二乘模型和线性模型，在拒绝验证中进行反向变换后，在log1p空间中R2 = 0.855, RMSE = 12.5 mg m - 3。将该模型应用于MODIS月度复合资料，重建了24年的Chl-a变化，揭示了亚马逊河洪水脉冲退潮期和低潮期的周期性最大值。空间分析表明，在半隔离的盆地中浓度增加，在河流连接处稀释更强。像素级的不确定性度量——源自时间变率、自举重采样和气候异常——表明，远洋带的反演结果很稳定，但河湖界面的不确定性较高。基于shap的XAI证实了红色和红边光谱特征（665-709 nm）在Chl-a预测中的主导作用，与生物光学理论一致，增强了模型的可解释性。除了Curuai，这种可扩展的方法还可以对整个亚马逊流域的洪泛区湖泊进行系统监测，这些湖泊的水文连通性、极端干旱和日益加剧的人类压力日益影响水质。

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引用次数: 0

Molecular biomarkers associated with environmental naphthalene exposure in the respiratory system 与呼吸系统环境中萘暴露相关的分子生物标志物

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-07 DOI: 10.1016/j.scitotenv.2025.181323

Hye-Jeong Han , Amartuvshin Baasankhuu , Bogun Kim , Angela Astrid Sekar Prameswari , Karina Kalani , Paolo Panza , Sangwoo Lee , Woo-Keun Kim , In-Geol Choi , Cheol-Hee Kim , Hyun-Taek Kim

Naphthalene (NPT) is a polycyclic aromatic hydrocarbon (PAH) contaminant found in tobacco smoke and various consumer products, causing widespread toxic exposure to human. NPT-induced cell toxicity depends on a metabolic activation step mediated by cytochrome P450 (CYP) and primarily affects non-ciliated club cells of the conducting airways. Here, we characterize the histological features and gene expression profiles of airway epithelial cells following NPT-induced injury and identify early response genes (ERGs) that are sensitive to NPT in respiratory organs. NPT results in the detachment and sloughing of pseudostratified airway epithelial cells within 24 h post-injection (hpi). From bulk transcriptomic analyses of NPT-treated mouse lungs, we observed significant upregulation of genes associated with responses to external stimuli and chemical exposure at 24 hpi. To identify novel molecular biomarkers of chemical injury, we selected 11 candidate genes functionally related to these processes for further investigation. Most of these genes are upregulated in cells isolated from bronchoalveolar lavage fluid (BALF) of NPT-injured lungs. Moreover, the selected ERGs are dynamically upregulated in a cell type-specific manner in the trachea and lung following NPT injury, with Vimentin and E-Cadherin marking mesenchymal and epithelial cell responses to NPT, respectively. Taken together, our findings reveal that NPT induces cytotoxicity and impairs cell adhesion in airway epithelial cells. From respiratory tissues, BALF cells, and a human airway epithelial cell line, we identify ERGs that serve as potential molecular biomarkers of respiratory exposure to environmental toxicants.

萘（NPT）是一种多环芳烃（PAH）污染物，存在于烟草烟雾和各种消费品中，对人体造成广泛的毒性暴露。npt诱导的细胞毒性依赖于细胞色素P450 （CYP）介导的代谢激活步骤，主要影响传导气道的非纤毛俱乐部细胞。在这里，我们描述了NPT诱导损伤后气道上皮细胞的组织学特征和基因表达谱，并确定了呼吸器官中对NPT敏感的早期反应基因（ERGs）。注射后（hpi） 24小时内，NPT导致假分层气道上皮细胞脱离和脱落。通过对npt处理小鼠肺部的大量转录组学分析，我们观察到与24 hpi时外部刺激和化学物质暴露反应相关的基因显著上调。为了寻找新的化学损伤分子生物标志物，我们选择了11个与这些过程功能相关的候选基因进行进一步研究。这些基因中的大多数在从npt损伤肺的支气管肺泡灌洗液（BALF）中分离的细胞中上调。此外，在NPT损伤后，所选择的ERGs在气管和肺中以细胞类型特异性的方式动态上调，Vimentin和E-Cadherin分别标记间充质细胞和上皮细胞对NPT的反应。综上所述，我们的研究结果表明，NPT诱导气道上皮细胞的细胞毒性并损害细胞粘附。从呼吸组织、BALF细胞和人类气道上皮细胞系中，我们发现了作为呼吸暴露于环境毒物的潜在分子生物标志物的ERGs。

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引用次数: 0

Tree-ring evidence marks year 2022 as the driest spring season in nearly four centuries in the Western Himalayas 树木年轮的证据表明，2022年是喜马拉雅山西部近四个世纪以来最干燥的春季

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-07 DOI: 10.1016/j.scitotenv.2025.181315

Pushpendra Pandey , Moetasim Ashfaq , Devi Lal , Mayank Shekhar , Bhupendra Bahadur Singh , Parminder Singh Ranhotra , Pritam Chand , Amalava Bhattacharyya

The Hindukush-Karakoram-Himalayan region is a crucial freshwater source for billions across South Asia, yet its climate remains poorly understood due to limited long-term records. Winter and spring precipitation govern snow accumulation and downstream water availability in dry months particularly across the Western Himalayas (WH), but recent decades show intensifying droughts with unclear long-term context. We have reconstructed a nearly four-century-long spring i.e. February to May (FMAM) precipitation for the Lahaul region of the (WH), an area dominated by the Western Disturbances. This record was developed using moisture-sensitive Cedrus deodara (Deodar) tree-rings from three high-elevation sites. A regional composite tree-ring-width chronology, developed through a Nested Principal Component Analysis and modeled with a nonlinear Generalized Additive Model (GAM) that explains 71 % of the variance during the calibration period. We identified the last two decades as the most precipitation deficit phase and the year 2022 showing the driest FMAM on record. The observed rise in the FMAM dry episodes post 1999 CE in our reconstruction, corresponds to the meteorological records. This recent drying is linked to a northward shift of the subtropical westerly jet and reduced moisture transport, both associated with unusual sea surface temperature patterns in the tropical Indian Ocean and the Western Pacific Ocean. Our results provide compelling evidence of long-term hydroclimatic instability in the WH and emphasize the value of tree-ring records in extending precipitation histories beyond the instrumental observations. Such reconstructions can be benchmarks to validate high-resolution climate models and formulate adaptation policies to mitigate future risks.

兴都库什-喀喇昆仑-喜马拉雅地区是南亚数十亿人的重要淡水来源，但由于有限的长期记录，人们对其气候知之甚少。冬季和春季降水控制着干旱月份的积雪和下游水资源供应，特别是在西喜马拉雅山脉（WH），但近几十年来干旱加剧，长期背景不明。我们重建了以西部扰动为主的Lahaul地区近400年的春季（2 - 5月）降水（FMAM）。这一记录是利用来自三个高海拔地区的对水分敏感的雪松（Deodar）树的年轮进行的。通过嵌套主成分分析开发的区域复合树轮宽度年表，并使用非线性广义可加模型（GAM）建模，该模型解释了校准期间71%的方差。我们确定过去20年是降水最亏缺的阶段，2022年是有记录以来最干旱的FMAM年。在我们的重建中，观测到的1999年以来FMAM干旱事件的增加与气象记录相一致。最近的干燥与副热带西风急流的北移和水汽输送的减少有关，这两者都与热带印度洋和西太平洋不寻常的海面温度模式有关。我们的研究结果提供了令人信服的证据，证明了西部地区长期的水文气候不稳定，并强调了树木年轮记录在延长仪器观测之外的降水历史方面的价值。这种重建可以作为验证高分辨率气候模型和制定适应政策以减轻未来风险的基准。

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引用次数: 0

Identification of extremely low-terpene-emitting variants from an urban greening tree species Quercus myrsinifolia 城市绿化树种黑栎极低萜烯释放变异的鉴定。

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-06 DOI: 10.1016/j.scitotenv.2025.181321

Ting-Wei Chang , Haruka Mochizuki , Noboru Masui , Akira Tani

Terpene-emitting plants may risk air quality and agricultural yields by increasing tropospheric ozone with nitrogen oxides. However, the number of non- or low-terpene-emitting species is limited, leading to a potential trade-off in species diversity when air quality considerations are prioritized for afforestation and urban greening. To expand the available choices, developing non- or extremely low-terpene-emitting cultivars from species with high-terpene emissions could be a feasible solution. In this study, we observed terpene emissions from multiple individuals of a common afforestation tree in Asia with high monoterpene emission rates, Quercus myrsinifolia, to identify natural low-monoterpene-emitting variants. A screening result showed that the total monoterpene emission rate at temperature of 30 °C and photosynthetic photon flux density of 1000 μmol m⁻² s⁻¹ among the 47 individuals ranged from no detection to 8.8 nmol m⁻² s⁻¹ in summer, where two out of them showed no detectable monoterpene emissions. With additional validation over months using the leaf cuvette method, extremely low monoterpene emissions which were solely composed of β-ocimene were detected for the two candidates during a warm month, and no monoterpenes were detected in the later months. Concurrently, net photosynthetic rates of the two candidate individuals were comparable to those of other individuals. Subsequent observations of the clones propagated from these variants detected no monoterpene emissions. These findings indicated that their extremely low-monoterpene-emitting trait is reproducible and attributed to their genotype. These variants are expected to be the foundation for establishing a low-air-quality-impacting cultivar for afforestation and urban greening.

排放萜烯的植物可能会因氮氧化物增加对流层臭氧而危及空气质量和农业产量。然而，不排放萜烯或低排放萜烯的物种数量有限，当空气质量优先考虑造林和城市绿化时，可能会导致物种多样性的权衡。为了扩大选择范围，从萜烯高排放的品种中培育出萜烯不排放或极低排放的品种可能是一个可行的解决方案。在这项研究中，我们观察了亚洲常见的一种高单萜烯排放率的造林树木——栎（Quercus myrsinifolia）的多个个体的萜烯排放，以确定天然的低单萜烯排放变异。筛选结果表明，在温度为30℃、光合光子密度为1000 μmol m-2 s-1的条件下，47个个体的总单萜类排放率为无检测到，夏季为8.8 nmol m-2 s-1，其中2个个体的单萜类排放率为无检测到。经过几个月的叶片试管法验证，在温暖的月份检测到两个候选植物的单萜烯排放量极低，仅由β-辛烯组成，在随后的几个月没有检测到单萜烯。同时，两个候选个体的净光合速率与其他个体相当。随后对这些变种繁殖的克隆进行观察，没有发现单萜烯的排放。这些发现表明，它们极低的单萜烯释放特性是可重复的，并归因于它们的基因型。这些变异有望为建立低空气质量影响的造林和城市绿化品种奠定基础。

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引用次数: 0

Lignin phenol abundances and ratios are modulated by their interactions with iron hydroxides in sediments 木质素酚的丰度和比例是通过它们与沉积物中的铁氢氧化物的相互作用来调节的。

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-06 DOI: 10.1016/j.scitotenv.2025.181322

Anja Moritz , Milad Ezzati , Yves Gélinas

Iron hydroxides play a key role in the preservation of organic matter in soils and sediments, yet the specificity and extent of their interactions with lignin-derived phenols—important source indicators for terrestrial organic matter—remain poorly understood in aquatic systems. In this study, we analyzed surface and downcore sediments along the terrestrial-to-marine continuum of the St. Lawrence Estuary and Gulf, as well as from a boreal lake (Lake Brock), to better characterize iron–lignin associations. Using CuO oxidation (lignin) and buffered dithionite (iron), we quantified lignin oxidation products before and after the reductive dissolution of reactive iron with dithionite and evaluated association patterns through multivariate analyses. Our results show that lignin is consistently associated with reactive iron, with losses upon iron dissolution ranging from ∼20 % for the marine sites to over 40 % in terrestrial and freshwater sediments. Strikingly, 3,5-dihydroxybenzoic acid (3,5-Bd) showed the highest sensitivity to iron reduction, suggesting a unique and possibly distinct origin or sorptive behavior. Despite substantial lignin oxidation products losses, source-indicating S/V and C/V ratios remained relatively stable, and acid-to-aldehyde ratios—proxies for lignin degradation—were not significantly affected by iron binding. Principal component analysis confirmed that compositional shifts following iron hydroxides reduction are small and limited to one terrestrially influenced sample. These findings reveal that iron hydroxides not only shield lignin-rich organic matter from degradation but also act as selective shuttles for phenolic terrestrial compounds across dynamic redox boundaries in aquatic sediments.

铁氢氧化物在土壤和沉积物中有机质的保存中起着关键作用，但它们与木质素衍生的酚（陆生有机质的重要来源指标）相互作用的特异性和程度在水生系统中仍然知之甚少。在这项研究中，我们分析了沿着圣劳伦斯河口和海湾的陆海连续体以及北方湖泊（布洛克湖）的地表和下芯沉积物，以更好地表征铁木质素的关联。利用CuO氧化（木质素）和缓冲二硫代铁（铁），我们量化了活性铁与二硫代铁还原溶解前后的木质素氧化产物，并通过多变量分析评估了相关模式。我们的研究结果表明，木质素始终与活性铁有关，铁的溶解损失范围从海洋场地的~ 20%到陆地和淡水沉积物的40%以上。引人注目的是，3,5-二羟基苯甲酸（3,5- bd）对铁还原表现出最高的敏感性，这表明它具有独特的吸附行为。尽管木质素氧化产物损失很大，但指示源的S/V和C/V比率保持相对稳定，酸醛比（木质素降解的代表）没有受到铁结合的显著影响。主成分分析证实，铁氢氧化物还原后的成分变化很小，仅限于一个陆地影响的样品。这些发现表明，铁氢氧化物不仅可以保护富含木质素的有机物免受降解，而且还可以作为水生沉积物中酚类陆生化合物在动态氧化还原边界上的选择性穿梭体。

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引用次数: 0

Progressive exploration of the four municipal solid composting phases for microplastics pollution: Extraction, abundance, and distribution 四个城市固体堆肥阶段微塑料污染的渐进探索：提取，丰度和分布。

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-06 DOI: 10.1016/j.scitotenv.2025.181339

Adeola Adelugba , Mason MacDonald , Samuel Asiedu , Lord Abbey , Chijioke Emenike

Research on microplastic (MP) pollution in agriculture is limited, particularly concerning municipal solid waste (MSW) compost, which is commonly used to enhance soil quality but can introduce MPs into agricultural systems. This study evaluates the density separation efficiency of ZnCl₂ and CaCl₂ in both spiked and non-spiked compost. It also tracks MP abundance and size distribution throughout the composting stages—mesophilic, thermophilic, curing, and mature—at a Canadian facility. The research employs a combination of three extraction methods: wet-sieving, organic digestion, and density separation. Results indicate that ZnCl₂ yields an extraction recovery of ∼99.9 % in spiked tests, outperforming CaCl₂, which achieves about 95 %. In the non-spiked study, ZnCl₂ recovered 242 MP particles/kg of wet compost compared to CaCl₂, which extracted 138 MP particles. Moreover, MP abundance increased throughout the composting process, demonstrating a linear relationship between MP size and abundance. Characterization via ATR-FTIR spectroscopy revealed that polyethene, polypropylene, and polystyrene were the most common MPs, while polyurethane, polyvinyl chloride, and cigarette filters were less prevalent. These findings underscore the need to improve MP management in organic composting, given its potential impact on plant health. Additionally, it enables a more focused approach to MP studies in compost, with an effective, affordable extraction protocol.

农业中微塑料污染的研究有限，特别是关于城市固体废物（MSW）堆肥的研究，这通常用于提高土壤质量，但会将微塑料引入农业系统。本研究评价了加穗和未加穗堆肥中氯化锌和氯化钙的密度分离效率。它还跟踪MP丰度和大小分布在整个堆肥阶段-嗜温，嗜热，固化和成熟-在加拿大的设施。该研究采用了三种提取方法的组合：湿筛法、有机消化法和密度分离法。结果表明，在加标试验中，ZnCl 2的萃取回收率为~ 99.9%，优于CaCl 2，后者达到约95%。在未加标的研究中，ZnCl₂回收242 MP颗粒/kg湿堆肥，而CaCl₂提取138 MP颗粒/kg。此外，在整个堆肥过程中，MP丰度增加，表明MP大小与丰度之间存在线性关系。通过ATR-FTIR光谱表征发现聚乙烯、聚丙烯和聚苯乙烯是最常见的MPs，而聚氨酯、聚氯乙烯和香烟过滤嘴则不那么普遍。这些发现强调了改进有机堆肥中多聚磷管理的必要性，因为它对植物健康有潜在的影响。此外，它使更集中的方法，以有效的，负担得起的提取方案，在堆肥的MP研究。

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引用次数: 0

Drivers of alpine-treeline-ecotone dynamics in the Pyrenees 比利牛斯山脉高山-树线-交错带动态的驱动因素。

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-06 DOI: 10.1016/j.scitotenv.2025.181318

Déborah Birre , Thierry Feuillet , Johan Milian , Olivier Theureaux , Paul Passy , Roberto Serrano-Notivoli , Luc Barbaro , Matthieu Vignal , Maaike Y. Bader

Aim

While alpine-treeline ecotones are expected to shift upwards and densify under climate warming, observed dynamics vary across mountain ranges. Most studies focus solely on elevational shifts, yet different dimensions may respond to different drivers—limiting our ability to predict ecosystem responses. We examined multiple aspects of treeline ecotone changes (elevational shifts, spatial-pattern changes, and infilling) in the temperate mountain range of the Pyrenees, focusing on the eastern French sector, and uncovered interactions between climate, topography, land use, and lithology at different spatial scales.

Methods

We studied 626 treeline ecotones in the eastern French Pyrenees to examine elevational shifts, spatial-pattern changes, and infilling in relation to climate, land-use, and habitat drivers. Regression and factorial analyses identified key drivers and recurrent environmental combinations affecting treeline ecotone dynamics.

Results

Three environmental clusters revealed contrasting regional dynamics across the eastern French Pyrenees. Western treeline ecotones showed the strongest upward shift, central treeline ecotones exhibited the highest local infilling, and eastern high-elevation treeline ecotones displayed downward shift and diffuse patterns. Overall, local topography influenced fine-scale infilling, while regional land-use and biogeographic contexts controlled broader treeline ecotone elevational shift, highlighting how different drivers operate at multiple spatial scales.

Conclusion

Understanding the effects of climate change requires considering multiple dimensions beyond elevational shifts, as each aspect of treeline ecotone dynamics responds differently to drivers operating at different spatial scales. Management strategies should adapt to multi-scale contexts rather than uniform approaches, particularly where treeline ecotone structure indicates scale-dependent processes.

目的：在气候变暖的情况下，高山林线过渡带预计会向上移动并密度增加，但观测到的动态在不同山脉之间存在差异。大多数研究只关注海拔高度的变化，然而不同的维度可能对不同的驱动因素做出反应，这限制了我们预测生态系统反应的能力。我们研究了比利牛斯山脉温带地区树线过渡带变化的多个方面（海拔变化、空间格局变化和填充），重点研究了法国东部地区，并揭示了不同空间尺度下气候、地形、土地利用和岩性之间的相互作用。方法：研究法国比利牛斯山脉东部626个树线过渡带的海拔变化、空间格局变化和填充与气候、土地利用和生境驱动因素的关系。回归和析因分析确定了影响树线交错带动态的关键驱动因素和反复出现的环境组合。结果：三个环境集群揭示了法国东部比利牛斯山脉的不同区域动态。西部树线带向上移动最强，中部树线带局部填充最大，东部高海拔树线带向下移动和扩散。总体而言，局部地形影响精细尺度的填充，而区域土地利用和生物地理背景控制更广泛的树线交错带海拔变化，突出了不同驱动因素在多个空间尺度上的作用。结论：了解气候变化的影响需要考虑海拔变化以外的多个维度，因为在不同的空间尺度上，树线交错带动态的各个方面对驱动因素的响应不同。管理策略应适应多尺度环境，而不是统一的方法，特别是当树线交错带结构表明依赖于尺度的过程时。

{"title":"Drivers of alpine-treeline-ecotone dynamics in the Pyrenees","authors":"Déborah Birre , Thierry Feuillet , Johan Milian , Olivier Theureaux , Paul Passy , Roberto Serrano-Notivoli , Luc Barbaro , Matthieu Vignal , Maaike Y. Bader","doi":"10.1016/j.scitotenv.2025.181318","DOIUrl":"10.1016/j.scitotenv.2025.181318","url":null,"abstract":"<div><h3>Aim</h3><div>While alpine-treeline ecotones are expected to shift upwards and densify under climate warming, observed dynamics vary across mountain ranges. Most studies focus solely on elevational shifts, yet different dimensions may respond to different drivers—limiting our ability to predict ecosystem responses. We examined multiple aspects of treeline ecotone changes (elevational shifts, spatial-pattern changes, and infilling) in the temperate mountain range of the Pyrenees, focusing on the eastern French sector, and uncovered interactions between climate, topography, land use, and lithology at different spatial scales.</div></div><div><h3>Methods</h3><div>We studied 626 treeline ecotones in the eastern French Pyrenees to examine elevational shifts, spatial-pattern changes, and infilling in relation to climate, land-use, and habitat drivers. Regression and factorial analyses identified key drivers and recurrent environmental combinations affecting treeline ecotone dynamics.</div></div><div><h3>Results</h3><div>Three environmental clusters revealed contrasting regional dynamics across the eastern French Pyrenees. Western treeline ecotones showed the strongest upward shift, central treeline ecotones exhibited the highest local infilling, and eastern high-elevation treeline ecotones displayed downward shift and diffuse patterns. Overall, local topography influenced fine-scale infilling, while regional land-use and biogeographic contexts controlled broader treeline ecotone elevational shift, highlighting how different drivers operate at multiple spatial scales.</div></div><div><h3>Conclusion</h3><div>Understanding the effects of climate change requires considering multiple dimensions beyond elevational shifts, as each aspect of treeline ecotone dynamics responds differently to drivers operating at different spatial scales. Management strategies should adapt to multi-scale contexts rather than uniform approaches, particularly where treeline ecotone structure indicates scale-dependent processes.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"1013 ","pages":"Article 181318"},"PeriodicalIF":8.0,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145916560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced removal of microplastics using microflotation 微浮选法提高微塑料的去除效果。

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-06 DOI: 10.1016/j.scitotenv.2025.181259

Gurmeet Kaur , Joachim Fettig , Martin Oldenburg , Stefan Grass , Christina Marx

Microplastics (MPs) pose a significant and growing threat to aquatic ecosystems and human health, yet conventional removal technologies such as sedimentation and filtration often exhibit limited efficiency, particularly for particles smaller than 50 μm, or require chemical additives to enhance performance. In this study, it is demonstrated that microflotation, a process leveraging optimized bubble-particle interactions based on small bubble sizes, can achieve high removal efficiencies (84–98 %) for MPs without the need for flocculants, coagulants, or other chemical additives. Using a pilot-scale system, the removal of 30 μm and 100 μm polystyrene particles across a range of environmentally relevant concentrations (2.5–180 mg/L) is tested. By precisely controlling operational parameters, microbubbles were generated with a narrow size distribution (13–75 μm) and a mean diameter of 36–40 μm, ensuring consistent and reproducible performance. Furthermore, the introduction of a novel bubble measurement technique to enhance process monitoring and optimization is presented. Our findings establish microflotation as a robust, scalable, and sustainable solution for MP removal, offering a viable alternative to conventional treatment methods while aligning with global efforts to reduce chemical usage in water treatment.

微塑料（MPs）对水生生态系统和人类健康构成了日益严重的威胁，但传统的去除技术（如沉淀和过滤）往往效率有限，特别是对于小于50 μm的颗粒，或者需要化学添加剂来提高性能。在这项研究中，证明了微浮选，一种基于小气泡尺寸的优化气泡-颗粒相互作用的过程，可以在不需要絮凝剂、混凝剂或其他化学添加剂的情况下实现高MPs的去除效率（84- 98%）。使用中试系统，测试了在环境相关浓度范围内（2.5-180 mg/L）去除30 μm和100 μm聚苯乙烯颗粒的效果。通过精确控制操作参数，生成的微气泡尺寸分布窄（13-75 μm），平均直径36-40 μm，保证了性能的一致性和可重复性。此外，介绍了一种新的气泡测量技术，以加强过程监控和优化。我们的研究结果表明，微浮选是一种强大的、可扩展的、可持续的MP去除解决方案，为传统处理方法提供了可行的替代方案，同时与全球减少水处理中化学品使用的努力保持一致。

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引用次数: 0

Disturbance and recovery of seagrass blue carbon: A large-scale in situ experiment 海草蓝碳的扰动与恢复：大规模原位实验。

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment

Pub Date : 2026-01-06 DOI: 10.1016/j.scitotenv.2025.181279

Carolyn J. Ewers Lewis , Karen J. McGlathery , Spencer J. Tassone , Michael L. Pace , Patricia L. Wiberg

Seagrass meadows provide important ecosystem services, including carbon sequestration (“blue carbon”), but are declining globally and continue to be threatened by warming temperatures. Factors controlling seagrass carbon recovery are poorly understood. We conducted the largest (28.27 m² plots) in situ experiment on disturbance and recovery of seagrass blue carbon across a natural temperature gradient in an eelgrass, Zostera marina, meadow. We developed a time-series of sediment accretion and erosion, sediment carbon, and biomass carbon over 25 months. We hypothesized that seagrass carbon in the cooler northern site would recover faster than in the warmer central site; however, sediment carbon eroded continuously in the northern site removal plots (−25.7 g C m⁻² yr⁻¹), despite the partial return of seagrass biomass. Control plots in the northern site continuously accreted sediment carbon (+32.8 g C m⁻² yr⁻¹). In the central site, sediment accretion/erosion rates did not follow a linear trend (net change control = +1.7 ± 4.4 mg C cm⁻², net change removal = −7.5 ± 5.3 mg C cm⁻²). Our comparison to traditional coring methods demonstrated that changes in sediment carbon could not be detected without time-series measurements of sediment gains and losses. Differences in carbon recovery appeared to be related primarily to interactions between hydrodynamics and shoot density rather than temperature. We conclude that factors regulating carbon loss versus recovery may differ and highlight the need for concurrent tracking of sediment dynamics and carbon density to accurately quantify changes in carbon stocks. Recovery of vegetation may not be indicative of sediment carbon recovery.

海草草甸提供重要的生态系统服务，包括固碳（“蓝碳”），但在全球范围内正在减少，并继续受到气温变暖的威胁。控制海草碳回收的因素尚不清楚。本研究在自然温度梯度条件下，对海草蓝碳的干扰和恢复进行了最大的原位实验（28.27 m2）。我们开发了一个25个月的沉积物增加和侵蚀，沉积物碳和生物量碳的时间序列。我们假设温度较低的北部地区的海草碳比温度较高的中部地区恢复得更快；然而，尽管海草生物量部分恢复，但北部样地移除样地的沉积物碳持续被侵蚀（-25.7 g C m-2年-1）。北部对照区沉积物碳持续增加（+32.8 g C m-2年-1）。在中心站点，泥沙增积/侵蚀速率不遵循线性趋势（净变化控制= +1.7±4.4 mg C cm-2，净变化去除= -7.5±5.3 mg C cm-2）。我们与传统取心方法的比较表明，如果没有沉积物增益和损失的时间序列测量，就无法检测沉积物碳的变化。碳回收率的差异似乎主要与水动力和茎密度之间的相互作用有关，而不是与温度有关。我们得出的结论是，调节碳损失与恢复的因素可能不同，并强调需要同时跟踪沉积物动态和碳密度，以准确量化碳储量的变化。植被的恢复可能不是沉积物碳恢复的指示。

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引用次数: 0