Marine environmental research最新文献_第8页

Ecotoxicity of bromate and human health risks resulting from wastewater treatment units' effluents associated with some key physicochemical parameters in two hotspots connected to the Egyptian Mediterranean Sea 在与埃及地中海相连的两个热点地区，与一些关键理化参数相关的废水处理装置排出的溴酸盐的生态毒性和人类健康风险。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-26 DOI: 10.1016/j.marenvres.2024.106768

Gehan M. El Zokm , Ghada F. El-Said , Naglaa F. Soliman

This study is the first of its kind in terms of focusing on the seasonal monitoring of bromine species (bromide⁻ and bromate) and some of the main physicochemical parameters in the surface water of stations inside and in front of the El Noubareya and El-Umum drains that flow directly or indirectly to the Egyptian Mediterranean coast at A (El Noubareya Drain) and B (El-Mex Bay) sites. Among the bromine species, bromate (BrO₃⁻) is a disinfection byproduct considered by many international agencies to have a potential carcinogenic effect in humans and is also known to be ecologically toxic to aquatic organisms. Drain water samples collected from the studied sites A and B had a bromide/chlorinity ratio (3.85E-03 - 6.25E-03 and 3.27E-03 - 6.97E-03, respectively) significantly higher than the typical value for open seawater (3.50E-03), showing significant dilution with wastewater at drain stations in the investigated sites. The source and origin of bromine species and the major ions studied associated with the wastewater units were identified and tracked by calculating the ion/chlorinity ratio and multivariate analysis. The total hazard quotient (THQ) for bromate intake and dermal exposure in children, females, and males demonstrates negligible harm to human health. The toxic unit (TU) and the sum of toxic units (STU) values of the three trophic levels in the surface water for the two sites under investigation yielded approximately comparable values for risk quotient (RQ) and mixture risk characterization ratios (RCR_{mix(MEC/PNEC)}), indicating that invertebrates are more sensitive to bromate dangers than fish and algae. The study highlights the importance of conducting large-scale laboratory tests on the effluents resulting from wastewater treatment units, including bromide levels, to prevent the formation of dangerous side compounds such as bromate, which may have negative effects on populations and may lead to the toxicity of trophic levels in ecosystems.

这项研究是首次对直接或间接流向埃及地中海沿岸的 El Noubareya 和 El-Umum 排水渠 A（El Noubareya 排水渠）和 B（El-Mex 海湾）站点内和站点前的地表水中的溴物种（溴化物和溴酸盐）和一些主要物理化学参数进行季节性监测。在溴的种类中，溴酸盐（BrO3-）是一种消毒副产品，许多国际机构认为它对人类有潜在的致癌作用，而且已知它对水生生物具有生态毒性。从研究地点 A 和 B 采集的排水样本的溴/氯比值（分别为 3.85E-03 - 6.25E-03 和 3.27E-03 - 6.97E-03）明显高于开放式海水的典型值（3.50E-03），表明调查地点排水站的排水样本被废水严重稀释。通过计算离子/氯度比值和多元分析，确定并追踪了与废水单元相关的溴物种和主要离子的来源和出处。儿童、女性和男性摄入和皮肤接触溴酸盐的总危害商数（THQ）表明，对人体健康的危害可以忽略不计。调查的两个地点地表水中三个营养级的毒性单位（TU）和毒性单位总和（STU）值得出了大致相当的风险商数（RQ）和混合物风险特征比（RCRmix(MEC/PNEC)）值，表明无脊椎动物比鱼类和藻类对溴酸盐危害更敏感。这项研究强调了对废水处理装置产生的污水（包括溴化物含量）进行大规模实验室检测的重要性，以防止形成溴酸盐等危险的副化合物，这些副化合物可能会对种群产生负面影响，并可能导致生态系统中营养级的毒性。

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引用次数: 0

Beach wracks microbiome and its putative function in plastic polluted Mediterranean marine ecosystem 海滩礁石微生物群及其在受塑料污染的地中海海洋生态系统中的功能。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-25 DOI: 10.1016/j.marenvres.2024.106769

Anamarija Kolda , Maja Mucko , Ana Rapljenović , Zrinka Ljubešić , Kristina Pikelj , Željko Kwokal , Hana Fajković , Vlado Cuculić

The coasts of the world's oceans and seas accumulate various types of floating debris, commonly known as beach wracks, including organic seaweeds, seagrass, and ubiquitous anthropogenic waste, mainly plastic. Beach wrack microbiome (MB), surviving in the form of a biofilm, ensures decomposition and remineralization of wracks, but can also serve as a vector of potential pathogens in the environment. Through the interdisciplinary approach and comprehensive sampling design that includes geological analysis of the sediment, plastic debris composition analysis (ATR-FTIR) and application of 16S rRNA gene metabarcoding of beach wrack MBs, this study aims to describe MB in relation to beach exposure, sediment type and plastic pollution. Major contributors in beach wrack MB were Proteobacteria, Bacteroidetes, Actinobacteria, Planctomycetes, Verrucomicrobia and Firmicutes and there was significant dissimilarity between sample groups with Vibrio, Cobetia and Planococcus shaping the Exposed beach sample group and Cyclobacteriaceae and Flavobacterium shaping the Sheltered beach sample group. Our results suggest plastisphere MB is mostly shaped by beach exposure, type of seagrass, sediment type and probably beach naturalness with heavy influence of seawater MB and shows no significant dissimilarity between MBs from a variety of microplastics (MP). Putative functional analysis of MB detected plastic degradation and potential human pathogen bacteria in both beach wrack and seawater MB. The research provides the next crucial step in beach wrack MP accumulation research, MB composition and functional investigation with focus on beach exposure as an important variable.

世界海洋沿岸堆积着各种类型的漂浮物，俗称沙滩褶皱，包括有机海藻、海草和无处不在的人为废物，主要是塑料。以生物膜形式存活的海滩褶皱微生物群（MB）可确保褶皱的分解和再矿化，但也可能成为环境中潜在病原体的载体。本研究采用跨学科方法和综合采样设计，包括沉积物地质分析、塑料碎片成分分析（ATR-傅立叶变换红外光谱仪）和应用 16S rRNA 基因对海滩缠绕的甲基溴进行代谢编码，旨在描述甲基溴与海滩暴露、沉积物类型和塑料污染的关系。海滩滩涂甲基溴的主要成分是变形菌、类杆菌、放线菌、放线菌纲、蛭形微囊菌和固着菌，不同样本组之间存在显著差异，暴露海滩样本组主要是弧菌、栉水母纲和 Planococcus，而遮蔽海滩样本组主要是环状杆菌科和黄杆菌。我们的研究结果表明，塑球甲基溴主要受海滩暴露程度、海草类型、沉积物类型以及海滩自然程度的影响，海水甲基溴的影响较大，各种微塑料（MP）的甲基溴之间没有明显的差异。对甲基溴的推定功能分析发现，在海滩滩涂和海水甲基溴中都存在塑料降解和潜在的人类病原菌。这项研究为下一步海滩裂纹微塑料积累研究、微塑料成分和功能调查提供了重要依据，重点是海滩暴露这一重要变量。

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引用次数: 0

Molecular diversity and seasonal dynamics of Ostreococcus (Mamiellophyceae, Chlorophyta) in typical mariculture bays based on metabarcoding analysis 基于代谢编码分析的典型海水养殖海湾 Ostreococcus（叶绿藻门）的分子多样性和季节动态变化

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-24 DOI: 10.1016/j.marenvres.2024.106764

Feng Liu , Jiamin Li , Shuangle Jin , Liang Liu

Ostreococcus (Mamiellophyceae, Chlorophyta) is a cosmopolitan genus of marine pico-phytoplankton and the smallest free-living photosynthetic eukaryotes with cell size of 1–2 μm. To understand the diversity and spatio-temporal distribution of Ostreococcus in the Rongcheng coastal regions in northern China, metabarcoding analysis based on the 18S rDNA V4 molecular marker was applied to study the molecular diversity and seasonal dynamics of Ostreococcus in three typical mariculture bays (Rongcheng Bay, Lidao Bay and Sanggou Bay). A total of 103 amplicon sequence variants (ASVs) annotated as Ostreococcus were detected in these three typical mariculture bays throughout the year. The top five ASVs in terms of abundance were ASV4, ASV9, ASV14, ASV28 and ASV109, totally occupying 99.1% of Ostreococcus reads. Phylogenetic analysis showed that these five dominant ASVs represented two Ostreococcus ecotypes (OI and OII) and were grouped into four Ostreococcus clades including Ostreococcus lucimarinus (ASV9) and Ostreococcus tauri (ASV28 and ASV109) in OI, and Ostreococcus sp. RC1 (ASV4) and Ostreococcus sp. RC2 (ASV14) in OII, which provided direct evidence to support the co-existence of two ecotypes in the Rongcheng coastal regions. Five dominant ASVs in OI and OII exhibited two distinct seasonal distribution patterns. Three dominant ASVs (ASV9, ASV28 and ASV109) in OI could be detected in all four seasons of the year, exhibiting native distribution properties, while two ASVs (ASV4 and ASV14) in OII decreased sharply in winter and could not be detected in spring, exhibiting characteristics of alien inputs. The composition, succession and association of Ostreococcus community were mainly driven by water temperature in these mariculture bays. This study helps us systematically understand the molecular diversity and distribution patterns of Ostreococcus in typical mariculture bays in northern China, laying the foundation for understanding and revealing the ecological functions of pico-phytoplankton.

海洋球藻（Mamiellophyceae, Chlorophyta）是一种世界性的海洋微浮游植物属，也是最小的自由生活光合真核生物，细胞大小为1-2微米。为了解中国北方荣成沿海地区赤潮球藻的多样性和时空分布，应用基于 18S rDNA V4 分子标记的代谢编码分析方法，研究了三个典型海湾（荣成湾、里岛湾和桑沟湾）赤潮球藻的分子多样性和季节动态。在这三个典型海湾中，全年共检测到 103 个注释为 Ostreococcus 的扩增子序列变体（ASV）。丰度最高的五个 ASV 分别为 ASV4、ASV9、ASV14、ASV28 和 ASV109，共占 Ostreococcus 读数的 99.1%。系统发育分析表明，这五个优势 ASV 代表了两个 Ostreococcus 生态型（OI 和 OII），并被归入四个 Ostreococcus 支系，包括 OI 支系中的 Ostreococcus lucimarinus（ASV9）和 Ostreococcus tauri（ASV28 和 ASV109），以及 OI 支系中的 Ostreococcus sp.RC1（ASV4）和 RC2（ASV14），为荣成沿海地区两种生态型共存提供了直接证据。OI 和 OII 中的 5 种优势 ASV 表现出两种不同的季节分布模式。OI中的3个优势ASV（ASV9、ASV28和ASV109）在一年四季中均可检测到，表现出原生分布特征；而OII中的2个ASV（ASV4和ASV14）在冬季急剧减少，春季无法检测到，表现出外来输入特征。这些海水养殖海湾中尾孢球藻群落的组成、演替和关联主要受水温的影响。本研究有助于我们系统地了解中国北方典型海水养殖海湾中尾孢藻的分子多样性和分布模式，为认识和揭示微小浮游植物的生态功能奠定基础。

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引用次数: 0

Evaluating fish foraging behaviour on non-indigenous Asparagopsis taxiformis using a remote video foraging system 利用远程视频觅食系统评估鱼类在非土著蓑鲉上的觅食行为

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-24 DOI: 10.1016/j.marenvres.2024.106766

Sahar Chebaane , Aschwin Hillebrand Engelen , Miguel Pessanha Pais , Rodrigo Silva , Francesca Gizzi , Raül Triay-Portella , Marta Florido , João Gama Monteiro

The proliferation of pest and invasive marine macroalgae threatens coastal ecosystems, with biotic interactions, including direct effects such as grazing and indirect effects such as the trophic cascades, where one species indirectly affects another through its interactions with a third species, play a critical role in determining the resistance of local communities to these invasions. This study examines the foraging behaviour and preference of native fish communities toward native (Halopteris scoparia, Sargassum vulgare) and non-indigenous (Asparagopsis taxiformis) macroalgae using the Remote Video Foraging System (RVFS). Fifty-four weedpops were deployed across three locations to present these macroalgae, while associated epifaunal assemblages were also collected. Video analysis revealed that four common fish species displayed preference towards native macroalgae, possibly due to by the presence of zoobenthos rather than herbivory. This observation suggests that these fish species identified the macroalgae as a habitat that harboured their preferred food items. In contrast, A. taxiformis was consistently avoided, suggesting limited integration into the local food web. Site-specific variations in fish-macroalgae interactions and epifaunal diversity highlighted the complexity of these dynamics. This study contributes to understanding of the ecological implications of invasive macroalgae and supports the use of RVFS as a tool for assessing local biotic resistance against non-indigenous species in coastal ecosystems globally.

有害和入侵性海洋大型藻类的扩散威胁着沿海生态系统，生物之间的相互作用，包括直接影响（如放牧）和间接影响（如营养级联，即一种物种通过与第三种物种的相互作用间接影响另一种物种），在决定当地群落对这些入侵的抵抗力方面起着至关重要的作用。本研究利用远程视频觅食系统（RVFS）研究了本地鱼类群落对本地（Halopteris scoparia、Sargassum vulgare）和非本地（Asparagopsis taxiformis）大型藻类的觅食行为和偏好。在三个地点部署了 54 个杂草罂粟，以展示这些大型藻类，同时还收集了相关的附生动物组合。视频分析表明，四种常见鱼类对本地大型藻类表现出偏好，这可能是由于底栖生物的存在而非草食的缘故。这一观察结果表明，这些鱼类认为大型藻类是它们喜欢的食物栖息地。与此相反，A. taxiformis则一直被避开，这表明它们融入当地食物网的程度有限。鱼类与大型藻类之间的相互作用以及表生动物的多样性因地点而异，凸显了这些动态变化的复杂性。这项研究有助于理解入侵大型藻类对生态的影响，并支持将 RVFS 作为一种工具，用于评估全球沿海生态系统中当地生物对非土著物种的抵抗力。

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引用次数: 0

Impact of Alaska atmospheric blocking on the carbon flux in the Northeast Pacific Ocean 阿拉斯加大气阻塞对东北太平洋碳通量的影响。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-24 DOI: 10.1016/j.marenvres.2024.106770

Hongyang Wang, Ke Zhang, Chengfeng Le

The Northeast Pacific Ocean (NEP) is one of the important carbon sinks in the global ocean. The causes of carbon flux changes in this region have been widely studied, but the physical processes associated with large scale climate variability remain controversial primarily due to scarcity of spatially and temporally continuous observations. In this study, we constructed a high-resolution sea surface partial pressure of CO₂ (pCO₂) from satellite observations for the NEP from 2003 to 2020 using the machine learning based XGBoost model. By analyzing the interannual large-scale high-latitude atmospheric dynamics and ocean physical conditions over the NEP, we find that the CO₂ flux density (FCO₂) anomalies have a strong correlation with the Alaskan atmospheric blocking events. In the region north of 48°N, anomalous cyclones triggered by atmospheric blocking increased sea surface height (SSH), which reduced the replenishment of dissolved inorganic carbon (DIC) from deep seawater, leading to enhanced carbon uptake. By contrast, in the region south of 48°N, the increase in sea surface temperature (SST) triggered by atmospheric blocking reduced the solubility of CO₂ in seawater, resulting in a decrease in regional carbon flux. These results provide new perspectives for better understanding and predicting the effects of high-latitude atmospheric dynamics on regional ocean carbon fluxes.

东北太平洋（NEP）是全球海洋中重要的碳汇之一。该区域碳通量变化的原因已被广泛研究，但与大尺度气候变异相关的物理过程仍存在争议，主要原因是缺乏时空连续观测数据。在本研究中，我们利用基于机器学习的 XGBoost 模型，从卫星观测数据中构建了 2003-2020 年国家环保局的高分辨率海面二氧化碳分压（pCO2）。通过分析 NEP 上的年际大尺度高纬度大气动力学和海洋物理条件，我们发现二氧化碳通量密度（FCO2）异常与阿拉斯加大气阻塞事件有很强的相关性。在北纬 48 度以北地区，大气阻塞引发的异常气旋增加了海面高度（SSH），从而减少了深层海水对溶解无机碳（DIC）的补充，导致碳吸收增加。相比之下，在北纬 48 度以南地区，大气阻塞引发的海面温度（SST）升高降低了二氧化碳在海水中的溶解度，导致区域碳通量减少。这些结果为更好地理解和预测高纬度大气动力学对区域海洋碳通量的影响提供了新的视角。

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引用次数: 0

Seascape effects on the nursery function of macroalgal habitats 海景对大型藻类栖息地育苗功能的影响。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-24 DOI: 10.1016/j.marenvres.2024.106767

Molly Moustaka , William D. Robbins , Shaun K. Wilson , Corey Wakefield , Michael VW. Cuttler , Michael J. O'Leary , Richard D. Evans

Understanding how seascape configuration influences nursery function is important for spatial management and conservation of essential habitats. Here, we examine how local habitat, seascape, and environmental factors influence demographic metrics of juvenile Lethrinus punctulatus and assess spatial variation in macroalgae nursery function. We quantified abundance, biomass, and productivity of juvenile L. punctulatus over three years and estimated size-at-age and condition from collected fish. Abundance, biomass, productivity, and size-at-age exhibited significant spatial variation, although each pattern was best explained by different factors. Lethrinus punctulatus were most abundant in macroalgae-rich seascapes, whereas biomass and productivity peaked where macroalgal cover and water temperatures were high. Conversely, fish exhibited the greatest average daily growth at sites near coral reefs. Processes contributing to spatial variation in size-at-age occur prior to fish reaching ∼5 cm in length and may be due to differences in resource availability, size at settlement, or size-selective mortality. Our findings suggest habitat and resource availability constrain L. punctulatus abundance and productivity, while size-at-age is influenced by size-selective mortality and prey quality. Thus, while seascape configuration can affect nursery function, the degree of influence will depend on the processes involved, emphasising the value of considering multiple metrics when identifying nurseries.

了解海景配置如何影响育苗功能对于重要生境的空间管理和保护非常重要。在这里，我们研究了当地栖息地、海景和环境因素是如何影响穿孔鳕幼鱼的繁殖指标，并评估了大型藻类育苗功能的空间变化。我们量化了三年来穿刺鳕幼鱼的丰度、生物量和生产力，并对收集到的鱼的年龄大小和状态进行了估计。丰度、生物量、生产力和龄期大小均表现出显著的空间差异，但每种模式都可以用不同的因素来解释。在大型藻类丰富的海域，穿孔鲈的数量最多，而在大型藻类覆盖率和水温较高的海域，穿孔鲈的生物量和生产力达到峰值。相反，在珊瑚礁附近的地点，鱼类的平均日生长量最大。导致鱼体大小空间差异的过程发生在鱼体长度达到 5 厘米之前，可能是由于资源可用性、定居时的大小或大小选择性死亡率的差异。我们的研究结果表明，栖息地和资源的可获得性限制了L. punctulatus的丰度和生产力，而定居时的大小则受大小选择性死亡和猎物质量的影响。因此，虽然海景配置会影响育苗功能，但影响程度取决于所涉及的过程，这强调了在确定育苗场时考虑多种指标的价值。

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引用次数: 0

Standing at water edges: Ecohydrological interactions between coastal groundwater discharge and intertidal community dynamics 站在水边：沿海地下水排放与潮间带群落动态之间的生态水文相互作用

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-21 DOI: 10.1016/j.marenvres.2024.106762

Ana Silva

The intertidal zone on rocky shores is of key ecological importance because it supports high biodiversity, provides critical ecosystem services such as nurseries and refuges, and facilitates complex species interactions in the transition to offshore areas. Important local shaping factors such as groundwater discharge complexify the ecological dynamics of rocky shore communities. The role of submarine groundwater discharge (SGD) in coastal ecosystems is well established. Here, I introduce the Intertidal Groundwater Discharge (IGD) concept to provide a standardised format for distinguishing it from other discharge types. Despite receiving recent increased attention, the importance of direct inland groundwater discharge into intertidal rocky habitats is still scattered. Rocky shores are hallmark habitats long hailed as biodiversity hotspots and key ecological players in adjacent environments; however, consolidated scientific assessments of GW-ecology linkage features and vulnerabilities are lacking. This review is the first to merge fragmented research and identify gaps in knowledge and methodological needs in assessing groundwater-mediated ecological intertidal processes. By filling these gaps, we can gain insights into the vulnerabilities of coastal ecosystems to climate-driven changes related to groundwater availability and design strategies that promote ecological resilience. Rising sea levels, altered precipitation and temperature patterns, and resource exploitation and pollution are increasing threats to the sustainability of rocky shore communities. Here, I integrate hydrogeochemical insights into the broader ecological context of these biodiversity hotspots to develop informed conservation strategies that safeguard the stability and functionality of dynamic and vulnerable habitats.

岩石海岸的潮间带具有重要的生态意义，因为它支持高度的生物多样性，提供关键的生态系统服务（如育苗场和庇护所），并在向近海区域过渡的过程中促进复杂的物种相互作用。当地的重要影响因素（如地下水排放）使岩岸群落的生态动态变得更加复杂。海底地下水排放（SGD）在沿岸生态系统中的作用已得到公认。在这里，我提出了潮间带地下水排泄（IGD）的概念，为区分潮间带地下水排泄与其它排泄类型提供了标准格式。尽管内陆地下水直接排入潮间带岩石栖息地的重要性近来受到越来越多的关注，但这一问题仍很分散。岩石海岸是标志性的栖息地，长期以来一直被誉为生物多样性热点和邻近环境中的关键生态角色；然而，目前还缺乏对全球降水-生态联系特征和脆弱性的综合科学评估。本综述首次合并了零散的研究，并确定了在评估地下水介导的潮间带生态过程方面的知识差距和方法需求。通过填补这些空白，我们可以深入了解沿海生态系统在与地下水可用性相关的气候驱动变化面前的脆弱性，并设计出促进生态恢复能力的策略。海平面上升、降水和温度模式改变、资源开发和污染对岩岸群落的可持续性构成了越来越大的威胁。在此，我将水文地质化学的见解与这些生物多样性热点地区更广泛的生态环境相结合，以制定明智的保护战略，保障充满活力的脆弱栖息地的稳定性和功能性。

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引用次数: 0

Elucidating maternal provisioning for bivalve larvae under ocean acidity extreme events 阐明海洋酸度极端事件下双壳类幼体的母体供给

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-21 DOI: 10.1016/j.marenvres.2024.106752

Yang Xu , Shaoliang Lyu , Xin Luo , Fortunatus Masanja , Yuewen Deng , Liqiang Zhao

Ocean acidity extreme (OAX) events, triggered by climate change and anthropogenic activities, are projected to become more intense and frequent in coastal ecosystems, devastating marine bivalves and ecosystems they support. Maternal effects adaptively modulate offspring performance in response to climatic stressors, but whether and to what extent they can confer offspring resistance to OAX remain largely unknown. Here, we investigated impacts of OAX on the parental and larval lipidomes of Manila clams (Ruditapes philippinarum) to add further insights into the energetic nature of maternal effects. A total of 177 significantly down-regulated lipid components (categorized into glycerolipids mainly) were shown in OAX-stressed adults compared with those reared under ambient conditions, and following parental conditioning, larvae also exhibited a further decreasing down-regulation of the glycerolipid components. Triacylglycerols were identified as the predominant composition of glycerolipids and the primary sources of energy for gonadal maturation and larvae development. Yet, larvae spawn from adults exposed to OAX had significantly lower contents of triacylglycerols than those without a prior history of parental conditioning, with the carbon chain length and unsaturation degree of the triacylglycerol components being significantly affected. The latter was also in line with significant increases in the production of triacylglycerol byproducts (diacylglycerols). Overall, our findings suggest that when OAX prevailed during reproductive seasons of Manila clams, maternal effects could be maladaptive by depressing the energetic deposition of larvae, and may not be a potential adaptive modulator of marine bivalves to cope with unprecedented environmental change.

由气候变化和人为活动引发的海洋酸度极端事件（OAX）预计将在沿海生态系统中变得更加剧烈和频繁，对海洋双壳贝类及其支持的生态系统造成破坏。母体效应能适应性地调节后代对气候胁迫的反应，但母体效应是否以及在多大程度上能赋予后代对 OAX 的抵抗力，在很大程度上仍是未知数。在这里，我们研究了 OAX 对马尼拉蛤（Ruditapes philippinarum）亲代和幼虫脂质体的影响，以进一步了解母体效应的能量性质。与在环境条件下饲养的成体相比，OAX 胁迫下的成体中共有 177 种脂质成分（主要分为甘油脂类）明显下调。经鉴定，三酰甘油是甘油脂的主要成分，也是性腺成熟和幼虫发育的主要能量来源。然而，从暴露于 OAX 的成体中产下的幼虫，其三酰甘油的含量明显低于未受亲本调节的幼虫，三酰甘油成分的碳链长度和不饱和程度受到显著影响。后者还与三酰甘油副产品（二酰甘油）产量的显著增加相一致。总之，我们的研究结果表明，当 OAX 在马尼拉蛤繁殖季节盛行时，母体效应可能会抑制幼体的能量沉积，从而产生不良适应性，而且可能不是海洋双壳类应对前所未有的环境变化的潜在适应性调节因子。

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引用次数: 0

How did the floating Ulva prolifera develop into the world's largest green tide? 漂浮的莼菜是如何发展成为世界上最大的绿潮的？

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-21 DOI: 10.1016/j.marenvres.2024.106763

Ning Gong , Kuishuang Shao , Lingyu Shen , Zixuan Wang , Xue Han , Kai Zhou , Deyu Kong , Xishan Pan

It has been 16 years since the world's largest Ulva bloom appeared in the Yellow Sea. However, it remains unclear how the floating Ulva prolifera developed into the immense green tide within two months especially considering that source control measures have been conducted since 2019. In this study, we investigated the growth mechanism of the floating population by examining the production and regeneration of U. prolifera explants and constructing a growth model. The results showed that U. prolifera explants exhibited rapid regeneration mainly through branches at 15, 20 and 25 °C. Algivore feeding and sporulation (at 20–25 °C) contributed to mass production of explants. The growth of floating population could be attributed to the coupling of mass production and rapid regeneration of explants through multiple cycles, which accounted for the outbreak of floating green tide. This finding presented a novel population growth model to elucidate macroalgal bloom occurrences.

黄海出现世界上最大的莼菜藻华已有 16 年之久。然而，特别是考虑到自 2019 年以来一直在采取源头控制措施，漂浮莼菜是如何在两个月内发展成巨大绿潮的仍不清楚。在本研究中，我们通过检测莼菜外植体的生成和再生，并构建生长模型，研究了漂浮种群的生长机制。结果表明，在15、20和25 °C条件下，U. prolifera外植体主要通过分枝表现出快速再生。食藻动物的摄食和孢子的产生（20-25 °C）促进了外植体的大量生产。漂浮种群的增长可归因于外植体的大量生产和快速再生的多次循环，这也是漂浮绿潮爆发的原因。这一发现提出了一个新的种群增长模型，以阐明大型藻类水华的发生。

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引用次数: 0

Temporal variability and ecological risks of pharmaceuticals and cocaine during the Christmas and New Year holidays in a beach area of North Coast of São Paulo, Brazil 巴西圣保罗北海岸海滩地区圣诞节和新年假期期间药物和可卡因的时间变化和生态风险

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-09-20 DOI: 10.1016/j.marenvres.2024.106759

Vinicius Roveri , Luciana Lopes Guimarães , Rafael Barreiros Kiyotani , Wellington Rui Andrade de Assis Junior , Ana Paula Metropolo , Gilmar Aparecido dos Santos , Aírton Zogaib Rodrigues , Camilo Dias Seabra Pereira , Alberto Teodorico Correia

This study assessed the occurrence and ecological potential risk of nine selected pharmaceuticals in water samples from the Juquehy River. The river flows continuously to Juquehy Beach, known as “the jewel of the north coast" of São Paulo, Brazil. Samples were collected during Christmas and the New Year (period of December 2023–January 2024), in addition to a previous baseline weekend, to compare the loads during “celebratory parties" versus “normal operational conditions." The findings indicated that the “mass gathering" during Christmas and New Year holidays contributed significantly to an increase of the mass load of the nine pharmaceuticals flowing along to the Juquehy River, i.e., caffeine (14.40–633.00 ng/L) > losartan (<LOQ: limit of quantification to 9.43 ng/L) > furosemide (< LOQ to 9.16 ng/L) > diclofenac (0.61–4.55 ng/L) > carbamazepine (< LOQ to 0.73 ng/L) > orphenadrine (< LOQ to 0.11 ng/L) showed higher concentrations during the New Year holiday. Conversely, atenolol (< LOQ to 13.10 ng/L) > benzoylecgonine (0.33–7.23 ng/L) > cocaine (0.12–6.59 ng/L) showed higher concentrations during the Christmas day. The individual ecological risk assessment in the Juquehy River revealed a clear environmental concern for the aquatic ecosystem. The threat to the aquatic biota is significant, with caffeine and losartan presenting a moderate level of risk. Moreover, the mixture ecological risk assessment of nine compounds indicates acute moderate risks to algae, crustaceans, and fishes, as well as chronic low risks to fishes.

本研究评估了 Juquehy 河水样本中九种选定药物的存在情况和生态潜在风险。该河流源源不断地流向被誉为巴西圣保罗 "北海岸明珠 "的 Juquehy 海滩。在圣诞节和新年期间（2023 年 12 月至 2024 年 1 月），除了之前的基线周末外，还采集了样本，以比较 "庆祝派对 "和 "正常运行条件 "期间的负荷量。研究结果表明，圣诞节和新年期间的 "集体聚会 "大大增加了流向 Juquehy 河的九种药物的质量负荷，即咖啡因（14.40-633.00 ng/L）；洛沙坦（LOQ：定量限为 9.43 ng/L）；呋塞米（LOQ：定量限为 9.16 ng/L）；双氯芬酸（0.61-4.55纳克/升）、卡马西平（LOQ为0.73纳克/升）、奥芬那定（LOQ为0.11纳克/升）在元旦假期期间浓度较高。相反，阿替洛尔（LOQ：13.10 ng/L）、苯甲酰可待因（0.33-7.23 ng/L）和可卡因（0.12-6.59 ng/L）在圣诞节期间的浓度较高。对 Juquehy 河进行的个别生态风险评估显示，水生生态系统存在明显的环境问题。咖啡因和洛沙坦对水生生物群的威胁很大，属于中度风险。此外，对九种化合物进行的混合物生态风险评估显示，藻类、甲壳类动物和鱼类面临急性中度风险，鱼类面临慢性低度风险。

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引用次数: 0