Marine environmental research最新文献_第3页

Sedimentary organic carbon and nitrogen storage in a recovered saltmarsh: Rewilding as a nature-based solution for anthropogenically desiccated wetlands 在恢复的盐沼中沉积有机碳和氮的储存：作为人为干燥湿地的自然解决方案的再野生化。

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-31 DOI: 10.1016/j.marenvres.2026.107897

S. Haro , A. Corzo , S. Papaspyrou , E. García-Robledo , I. Caballero , G.M. Arroyo

Saltmarshes provide key ecosystem services, including atmospheric CO₂ sequestration and nitrogen burial in sediments. In recent decades, these blue carbon ecosystems have faced significant degradation from natural and anthropogenic stressors. In this study, rewilding of a desiccated saltmarsh in Cadiz Bay (SW Spain) was assessed as a nature-based solution to restore carbon (C_org) and nitrogen (N_T) storage. The rewilding process began in 2004 after breaching an external tidal wall. We evaluated changes in vegetated and unvegetated areas using Landsat satellite imagery (1994–2024) and quantified C_org and N_T stocks and burial rates in wild and rewilded sediments, including vegetated saltmarsh (Sarcocornia sp.) and bare sediments colonized by microphytobenthos (MPB). Vegetated saltmarsh cover increased by 85% over 20 years, at an average recovery rate of 5 ha y⁻¹, concurrent with a decrease in unvegetated tidal flats. Average C_org stocks in the top 1 m ranged from 32 to 57 t C_org ha⁻¹, with higher values in vegetated sediments. However, only 5–12% of C_org was stored during the rewilding period. C_org burial rates averaged 69 g C_org m⁻² y⁻¹, and N_T stocks were 55% higher in rewilded sediments than in wild ones (3.6 vs. 1.6 t N_T ha⁻¹). Despite vegetation recovery, burial rates of C_org and N_T did not increase clearly, suggesting that long-term storage may be influenced by factors beyond rewilding. Less than 8% of sedimentary C_org originated from saltmarsh vegetation, indicating the dominance of allochthonous sources. These findings highlight the complexity of biogeochemical recovery in rewilded saltmarshes and underscore the need for long-term monitoring to determine how much time is truly required for C_org and N_T recovery.

盐沼提供关键的生态系统服务，包括大气中的二氧化碳封存和沉积物中的氮埋藏。近几十年来，这些蓝碳生态系统面临着自然和人为压力的严重退化。在这项研究中，对加的斯湾（西班牙西南部）的一个干涸盐沼进行了重新野生化评估，作为一种基于自然的恢复碳（Corg）和氮（NT）储存的解决方案。2004年，在冲破了一道外部潮汐墙后，放归野生动物的过程开始了。我们利用Landsat卫星图像（1994-2024）评估了有植被和无植被地区的变化，并量化了野生和再野生沉积物（包括有植被的盐沼（Sarcocornia sp.）和微底栖植物（MPB）定殖的裸沉积物）中Corg和NT的储量和埋藏率。20年来，盐沼植被覆盖面积增加了85%，平均恢复速度为5公顷/年，与此同时，无植被的潮滩面积减少。顶部1 m的平均储量在32 ~ 57 t Corg ha-1之间，植被沉积物的储量较高。然而，在野化期间，只有5-12%的Corg被储存。长埋率平均为69 g长m-2 y-1，再野生沉积物的NT储量比野生沉积物高55% （3.6 t NT hm -1比1.6 t NT hm -1）。尽管植被恢复，但长尾和短尾的埋藏率并没有明显增加，这表明长期储存可能受到野化以外因素的影响。只有不到8%的沉积煤来自盐沼植被，显示了外来来源的优势。这些发现强调了在重新野生盐沼中生物地球化学恢复的复杂性，并强调了长期监测的必要性，以确定Corg和NT恢复真正需要多少时间。

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引用次数: 0

Projected impacts of climate change on the spatial distribution and habitat preference of tropical tuna in the Pacific Ocean 气候变化对太平洋热带金枪鱼空间分布和生境偏好的预估影响

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-30 DOI: 10.1016/j.marenvres.2026.107868

Yan-Lun Wu , Ting-Yu Liang , Wei-Pin Hsu , Teruhisa Shimada , Anindya Wirasatriya , Parichat Wetchayont , Chunhua Qiu , Kuo-Wei Lan

Climate change is altering ocean conditions such as sea surface temperature, salinity, stratification, and dissolved oxygen, reshaping habitat suitability for yellowfin tuna (Thunnus albacares, YFT) and bigeye tuna (Thunnus obesus, BET). This study integrated Taiwanese longline catch-per-unit-effort (CPUE) data from 1981 to 2014 with environmental covariates using a Vector Autoregressive Spatio-Temporal (VAST) framework to develop Habitat Suitability Index (HSI) models. Fishing effort increased from ∼200,000 hooks in 1991 to nearly 820,000 in 2002, before declining to ∼400,000 by 2021. YFT dominated catches until 2000, after which BET became predominant. Spatial analyses indicated BET hotspots in the tropical central and eastern Pacific, whereas YFT were more abundant in the western Pacific with smaller hotspots in the east. Suitability curves showed BET favored cooler, moderately saline, oxygen-rich waters, while YFT preferred warmer, saltier, and slightly less oxygenated conditions. Coupling HSI models with CMIP6 projections under SSP1-2.6 and SSP5-8.5 revealed contrasting redistribution patterns: BET habitats are projected to contract and shift eastward by the end of the century, while YFT habitats are expected to expand across wider Pacific regions. These findings demonstrate that climate-driven changes in tuna distribution will likely reshape fishery productivity and management requirements. Region-specific quota adjustments, flexible management zones, and strengthened multinational cooperation will be necessary. Incorporating the HSI outputs into quota setting and spatial planning can help sustain Taiwan's distant-water tuna fisheries in a changing climate.

气候变化正在改变海洋条件，如海面温度、盐度、分层和溶解氧，重塑黄鳍金枪鱼（Thunnus albacares， YFT）和大眼金枪鱼（Thunnus obesus， BET）的栖息地适宜性。本研究利用向量自回归时空（VAST）框架，将1981 ~ 2014年台湾延绳钓单位渔获量（CPUE）资料与环境协变量相结合，建立生境适宜性指数（HSI）模型。捕捞量从1991年的~ 20万个鱼钩增加到2002年的近82万个，到2021年减少到~ 40万个。直到2000年，YFT一直主导着捕捞量，之后BET成为主导。空间分析表明，BET热点分布在热带中太平洋和东太平洋，而YFT热点分布在西太平洋较为丰富，东部较少。适宜性曲线显示BET偏好较冷、中等盐度、富氧的水域，而YFT偏好较暖、较咸、含氧量略低的环境。将HSI模式与SSP1-2.6和SSP5-8.5下的CMIP6预估相结合，揭示了截然不同的再分布模式：预计到本世纪末，BET栖息地将收缩并向东移动，而YFT栖息地预计将在更广泛的太平洋地区扩张。这些发现表明，气候驱动的金枪鱼分布变化可能会重塑渔业生产力和管理要求。有必要根据地区调整配额、设立灵活的管理区、加强跨国合作。将HSI的产出纳入配额设定和空间规划，有助于在气候变化的情况下维持台湾的远洋金枪鱼渔业。

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引用次数: 0

Acute effects of copper exposure and predation risk in five coastal copepods 铜暴露对五种沿海桡足类动物捕食风险的急性影响。

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-29 DOI: 10.1016/j.marenvres.2026.107894

Solveig Brochmann , Jan Heuschele , Torben Lode , Tjalling Jager , Josefin Titelman , Katrine Borgå

Natural stressors, including predation risk, can affect the response of organisms to anthropogenic contamination. Copper, used as an antifouling agent, can affect non-target organisms. We tested for effects of excess copper on survival with and without predator cues in five species of coastal copepods. We exposed adult copepods to four copper concentrations (0–1350 μg L⁻¹, 48h) on an automated imaging platform and analysed the data using the reduced General Unified Threshold model for Survival (GUTS) to detect potential species differences in underlying toxico-kinetics and -dynamics. Calanoid copepods had elevated mortality during early copper exposure compared to a harpacticoid and a cyclopoid species. Species-specific dominant rate constants, which represents the time it takes for damage to reach a steady state, best explained the time-dependent toxicity. Over time, most predicted mortalities converged to a similar level regardless of species. Predation risk reduced mortality at the intermediate copper concentration, potentially explained by reduced copper bioavailability by binding of copper to kairomone molecules, or other intrinsic and extrinsic factors. Models like GUTS can reveal the underlying toxicity mechanisms and improve toxicity predictions in a multi-stressor world.

自然压力因素，包括捕食风险，可以影响生物体对人为污染的反应。铜，用作防污剂，可以影响非目标生物。我们测试了过量铜对五种沿海桡足类动物在有和没有捕食者线索的情况下生存的影响。在一个自动成像平台上，我们将成年桡足类暴露于4种铜浓度（0-1350 μg -1, 48小时）中，并使用简化的通用统一生存阈值模型（GUTS）分析数据，以检测潜在的毒性动力学和动力学的物种差异。在早期铜暴露过程中，与羽足类和环足类相比，角足类桡足类动物的死亡率较高。物种特有的优势速率常数，它代表了损害达到稳定状态所需的时间，最好地解释了时间依赖性毒性。随着时间的推移，大多数预测的死亡率趋同于一个相似的水平，无论物种如何。在中等铜浓度下，捕食风险降低了死亡率，这可能是由于铜与凯罗酮分子结合或其他内在和外在因素降低了铜的生物利用度。像GUTS这样的模型可以揭示潜在的毒性机制，并在多压力源的世界中改进毒性预测。

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引用次数: 0

Membrane fingerprints and morphotype shifts in Phaeodactylum tricornutum co-exposed to cadmium and PBAT macroplastics as ecotoxicological indicators 三角褐指藻（Phaeodactylum tricornutum）共暴露于镉和PBAT巨塑的膜指纹图谱和形态变化作为生态毒理学指标

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-29 DOI: 10.1016/j.marenvres.2026.107890

Oumaima Salhi , Bernard Lasserre , Adélaïde Le Grand , Philippe Douzenel , Mikaël Kedzierski , Anthony Magueresse , Monia Trabelsi , Lazhar Mhadhbi , Olivier Sire , Véronique Le Tilly

This study investigates the individual and combined effects of cadmium (Cd²⁺) and poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable macroplastic, on the marine diatom Phaeodactylum tricornutum (P. tricornutum). Interestingly, co-exposure with PBAT mitigates Cd²⁺ toxicity, except at high Cd²⁺ concentrations. Using a non-invasive Fourier-transform infrared (FTIR) spectroscopy protocol with robust acquisition parameters and principal component analysis, specific biochemical changes in membrane composition were monitored, with notable decreases in carbohydrate and lipid contents, while protein levels remained unaltered. Morphological observations revealed a shift toward the oval morphotype under exposure to Cd²⁺ and PBAT, alone and in combination, featuring a stress response. Additionally, the light-harvesting pigments, chlorophyll-a and fucoxanthin, increased in a dose-dependent manner upon Cd²⁺ exposure, while no significant β-carotene changes were observed, except at high Cd²⁺ concentrations in the presence of PBAT. This effect is further amplified under co-exposure conditions, the presence of PBAT leading to a marked increase in all three pigments, β-carotene included. The experimental protocol, which involved the aging of PBAT macroplastics in seawater for a short period, suggests that the degradation products of PBAT themselves are responsible for these observed biological effects. It is worth noting that morphotype shifts occur at lower Cd²⁺ concentrations than those affecting photosynthesis and photoprotective systems. These findings highlight the potential of P. tricornutum membrane fingerprints and morphotype shifts as sensitive ecotoxicological indicators of metal and plastic pollution, particularly in relation to degradation by-products in marine environments.

本文研究了镉（Cd2+）和可生物降解巨塑料聚己二酸丁二酯（PBAT）对海洋硅藻三角藻（P. tricornutum）的单独和联合作用。有趣的是，除了高Cd2+浓度外，与PBAT共暴露可减轻Cd2+毒性。采用具有鲁棒采集参数和主成分分析的非侵入性傅里叶变换红外（FTIR）光谱协议，监测膜组成的特定生化变化，碳水化合物和脂质含量显著降低，而蛋白质水平保持不变。形态学观察显示，在Cd2+和PBAT单独或联合作用下，细胞向椭圆形形态转变，具有应激反应。此外，捕光色素叶绿素-a和岩藻黄质在Cd2+暴露下呈剂量依赖性增加，而β-胡萝卜素没有显著变化，除非在PBAT存在的高Cd2+浓度下。这种效应在共暴露条件下被进一步放大，PBAT的存在导致所有三种色素（包括β-胡萝卜素）的显著增加。该实验方案涉及PBAT宏观塑料在海水中的短时间老化，表明PBAT的降解产物本身是这些观察到的生物效应的原因。值得注意的是，与影响光合作用和光保护系统的Cd2+浓度相比，形态变化发生在较低的Cd2+浓度下。这些发现突出了三角藻膜指纹图谱和形态变化作为金属和塑料污染的敏感生态毒理学指标的潜力，特别是与海洋环境中降解副产物有关。

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引用次数: 0

Bio-invasion and decadal changes in the trophic dynamics of a temporarily closed estuary: An Ecopath model from Veli-Akkulam Estuary, Kerala, India 临时封闭河口营养动态的生物入侵和年代际变化：来自印度喀拉拉邦Veli-Akkulam河口的生态模型

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-29 DOI: 10.1016/j.marenvres.2026.107895

Regi Syamala Ramachandrannair , Kiranya Bella , Sreekanth Giri Bhavan , Smrithy Raj , Appukuttannair Biju Kumar

Temporarily closed estuarine ecosystems (TCEs) are ecologically sensitive environments increasingly impacted by anthropogenic pressures and biological invasions. This study employs a mass-balanced trophic model using the Ecopath with Ecosim (EwE) framework to evaluate long-term changes in the structure and function of the Veli-Akkulam Estuary, a small TCE on the southwest coast of India. Based on field data from 2022 to 2023, the model integrates 17 functional groups, including invasive alien species such as Oreochromis mossambicus, O. niloticus, and Pterygoplichthys pardalis. Model outputs were compared with historical assessments from 1993 to 2008–2010 to examine decadal-scale shifts in ecosystem properties and dynamics.

Key ecological indicators such as mean trophic level of the catch (2.69), transfer efficiency (7.69 %), and Finn's Cycling Index (2.64 %) point to a simplified, detritus-dominated food web with reduced energy cycling and declining trophic maturity. Biomass is concentrated at lower trophic levels, while apex predators and native piscivores have markedly declined. Mixed Trophic Impact analysis revealed strong negative interactions between invasive species, particularly O. mossambicus, and native fish groups, suggesting competitive displacement and altered trophic relationships. High niche overlap further supports the hypothesis of dietary competition between invasive and native taxa, contributing to trophic reorganization.

System-level metrics, including a relative ascendancy of 37.42% and system overhead of 62.58%, indicate reduced ecosystem organization and rising instability. These trends reflect a transition from a functionally complex system to one increasingly dominated by opportunistic and invasive species. The study underscores the utility of Ecopath with Ecosim-based modelling in diagnosing trophic degradation and informing adaptive management. This study provides the first decadal Ecopath model demonstrating invasion-driven trophic simplification in a temporarily closed tropical estuary, and offers a replicable framework for assessing cumulative ecological impacts in tropical estuarine systems impacted by invasive species.

暂时封闭河口生态系统是受人为压力和生物入侵影响日益严重的生态敏感环境。本研究采用了一个质量平衡的营养模型，使用Ecopath with Ecosim （EwE）框架来评估印度西南海岸的一个小型TCE——Veli-Akkulam河口的结构和功能的长期变化。该模型基于2022年至2023年的野外数据，整合了17个功能群，包括入侵外来物种如Oreochromis mossambicus、O. niloticus和Pterygoplichthys pardalis。将模型输出与1993年至2008-2010年的历史评估结果进行比较，以检验生态系统特性和动态的年代际变化。关键的生态指标，如渔获物的平均营养水平（2.69）、转移效率（7.69%）和芬恩循环指数（2.64%）表明，这是一个简化的、以碎屑为主的食物网，能量循环减少，营养成熟度下降。生物量集中在低营养层，而顶端捕食者和本地鱼食性动物明显减少。混合营养影响分析显示，入侵物种（尤其是莫sambicus）与本地鱼类之间存在强烈的负相互作用，表明竞争位移和营养关系的改变。高生态位重叠进一步支持了入侵和本地类群之间的饮食竞争假说，有助于营养重组。系统级指标，包括37.42%的相对优势和62.58%的系统开销，表明生态系统组织减少，不稳定性上升。这些趋势反映了从一个功能复杂的系统向一个日益由机会主义和入侵物种主导的系统的转变。该研究强调了基于ecosim模型的Ecopath在诊断营养退化和告知适应性管理方面的效用。本研究提供了第一个十年代际生态模型，展示了暂时关闭的热带河口入侵驱动的营养简化，并为评估入侵物种对热带河口系统的累积生态影响提供了一个可复制的框架。

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引用次数: 0

Monsoon mysteries: Impact of rainfall-induced hydrographic changes on coastal zooplankton communities 季风之谜：降雨引起的水文变化对沿海浮游动物群落的影响。

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-29 DOI: 10.1016/j.marenvres.2026.107896

Tanmoy Nandy , Sabyasachi Sautya , Santosh Gaikwad , Rakesh P.S. , Balaram Sahu

In tropical coastal ecosystems, monsoonal rainfall is a critical driver of seasonal variability, inducing shifts in hydrological parameters such as temperature, salinity, and nutrient concentrations, which subsequently regulate zooplankton community structure. This study investigated the influence of the southwest monsoon on coastal water quality and zooplankton composition along the Mumbai coast, India. Sampling was conducted in the pre-monsoon (May 2022) and post-monsoon (September 2022) periods, corresponding to early (EMP) and later (LMP) monsoonal phases, during which the region receives 1500–2000 mm of precipitation. Analyses revealed distinct hydrological changes and a significant reorganisation of the zooplankton assemblage between phases. Total zooplankton abundance was lower in the EMP compared to the LMP. Among the 25 taxonomic groups identified, Copepoda dominated the community, represented by 27 species (23 Calanoida, 2 Harpacticoida, and 2 Cyclopoida), with families Acartidae and Paracalanidae comprising 70 % of the copepod population. Statistical and biological trait-based analyses demonstrated significant temporal shifts in copepod community composition and functional structure. Temperature, salinity, and nutrient levels were identified as the primary environmental factors shaping the distribution of copepod functional groups. Eleven copepod taxa served as indicator species for specific monsoonal phases. Trophic structure analysis showed a prevalence of omnivorous copepods during the EMP, likely due to reduced phytoplankton availability under lower nutrient concentrations and fluctuating salinity, favouring opportunistic feeding. In contrast, the LMP, characterised by elevated nutrient inputs and stabilised salinity, supported a more complex food web with a balanced representation of herbivorous, omnivorous, carnivorous, and detritivorous functional groups. Herbivores were numerically dominant in both periods. The increased co-dominance of meroplankton (pelagic larvae of benthic invertebrates) during the LMP highlighted their ecological role in coupling benthic and pelagic subsystems. These findings elucidate the mechanistic links between monsoonal hydrography and zooplankton functional ecology, providing a scientific basis for informed conservation and management of monsoon-influenced coastal ecosystems.

在热带沿海生态系统中，季风降雨是季节变化的关键驱动因素，引起温度、盐度和营养物质浓度等水文参数的变化，进而调节浮游动物群落结构。本文研究了西南季风对印度孟买沿岸水质和浮游动物组成的影响。在季风前（2022年5月）和季风后（2022年9月）进行了采样，对应于季风早期（EMP）和后期（LMP）阶段，在此期间该地区收到1500-2000毫米的降水。分析揭示了不同阶段之间明显的水文变化和浮游动物组合的显著重组。与LMP相比，EMP中的浮游动物总丰度较低。在鉴定的25个类群中，桡足类占主导地位，有27种（鹭足类23种、羽足类2种、环足类2种），其中笛足科和副笛足科占总数的70%。基于统计和生物学性状的分析表明，桡足动物群落组成和功能结构在时间上发生了显著的变化。温度、盐度和营养水平是影响桡足类功能群分布的主要环境因素。11个桡足类类群可作为特定季风期的指示种。营养结构分析显示，在EMP期间，杂食性桡足类动物普遍存在，这可能是由于在较低的营养浓度和波动的盐度下浮游植物的可用性减少，有利于机会性捕食。相比之下，LMP的特点是营养投入增加，盐度稳定，支持更复杂的食物网，具有草食性、杂食性、肉食性和营养官能团的平衡代表。在这两个时期，食草动物在数量上都占主导地位。在LMP期间，浮游生物（底栖无脊椎动物的上层幼虫）的共同优势增加，突出了它们在底栖和上层子系统耦合中的生态作用。这些发现阐明了季风水文与浮游动物功能生态学之间的机制联系，为季风影响的沿海生态系统的知情保护和管理提供了科学依据。

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引用次数: 0

Rising herbivory pressure of Sarpa salpa and the emerging threat to Southern European marine forests 萨尔巴萨尔巴不断上升的食草压力和对南欧海洋森林的新威胁

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-28 DOI: 10.1016/j.marenvres.2026.107884

J. de Azevedo , J.N. Franco , M. Dolbeth , H.S. Meyer , A. Barreiro , E.A. Salas-Leitón , F. Arenas

Climate change (CC) is driving shifts in marine ecosystems, particularly affecting temperate and subtropical marine forests, which are critical for biodiversity and ecosystem stability. Dominated by canopy-forming seaweeds, these forests are sensitive to CC-induced stressors, such as rising temperatures and tropicalisation, which favour turf-forming algae and increase the abundance of herbivorous fish, threatening ecosystem structure and function. Along the western coast of Portugal in Southern Europe, the herbivorous fish Sarpa salpa plays a key role in tropicalisation, potentially exacerbating the decline of cold-water seaweeds, whilst the Iberian upwelling system may offer localised protection through cooler conditions. This study combines stomach content analysis, subtidal surveys, functional trait analyses, fish landing records, and sea surface temperature (SST) data across the North, Centre, and South regions to assess the ecological role of S. salpa. Results confirmed a preference for brown algae, including habitat-forming species, with clear regional variation: kelps dominated diets in the North, whilst Cystoseira s.l. and turf-forming species prevailed in the Centre and South. Fish landing analyses revealed region-specific dynamics: landings in the North increased with higher SST, those in the Centre were unaffected by temperature, and those in the South were negatively correlated with SST. These findings highlight the potential threat of S. salpa to temperate marine forests under CC.

气候变化正在推动海洋生态系统的变化，特别是影响到对生物多样性和生态系统稳定至关重要的温带和亚热带海洋森林。这些森林以形成树冠的海藻为主，对气候变化引起的压力敏感，如温度上升和热带化，这有利于形成草坪的藻类和增加草食性鱼类的丰度，威胁到生态系统的结构和功能。在南欧的葡萄牙西海岸，草食性鱼类萨尔帕萨尔帕在热带化中起着关键作用，可能会加剧冷水海藻的减少，而伊比利亚上升流系统可能会通过较冷的条件提供局部保护。本研究结合胃内容物分析、潮下调查、功能特征分析、鱼类登陆记录和北、中、南三个区域的海温数据，评估了萨尔帕的生态作用。结果证实了对褐藻的偏好，包括栖息地形成物种，具有明显的区域差异：北部以海带为主，而中部和南部则以Cystoseira s.l.和草坪形成物种为主。鱼类登陆分析揭示了区域特有的动态：北部的登陆量随着海温的升高而增加，中部的登陆量不受温度的影响，南部的登陆量与海温呈负相关。这些发现突出表明，在CC条件下，salpa对温带海洋森林的潜在威胁。

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引用次数: 0

Genomic resilience to sequential environmental perturbations in two sympatric costal fish species 两种同域沿海鱼类对连续环境扰动的基因组恢复力

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-28 DOI: 10.1016/j.marenvres.2026.107893

Maribet Gamboa , Florence Tellier , Constanza Millán-Medina , Diego Silva , Eduardo Hernández-Miranda

Natural disasters impose acute environmental stressors that can drastically reshape marine populations. Abrupt changes in habitat, resulting from hypoxia due to upwelling and seismic-induced tsunamis, are known chronic events, but their effects on marine taxa are poorly studied. This study investigates the genomic and mitochondrial responses of two coastal fish species, Aphos porosus and Normanichthys crockeri, to two sequential disturbances: a hypoxic upwelling event in 2008 and a seismic-induced tsunami in 2010 in Coliumo Bay, Chile. Whole-genome and mitochondrial DNA analyses may reveal strong genetic differentiation and reduced genetic diversity in N. crockeri, indicating a demographic bottleneck and adaptive shifts. While A. porosus could exhibited genomic resilience, likely due to parental care and sex-biased dispersal, with moderate mitochondrial divergence and increased matrilineal diversity post-disturbance. Functional annotations highlighted possible signatures of stress response, metabolic adaptation, and mitochondrial plasticity. These findings may underscore the complex interplay of ecological traits, environmental stressors, and genetic mechanisms driving population resilience and structuring in marine systems.

自然灾害造成了严重的环境压力，可以极大地重塑海洋种群。由于上升流和地震引起的海啸引起的缺氧导致栖息地的突然变化是已知的慢性事件，但它们对海洋分类群的影响研究很少。本研究调查了两种沿海鱼类，Aphos porosus和Normanichthys crockeri对两个连续干扰的基因组和线粒体反应：2008年缺氧上升流事件和2010年智利Coliumo湾地震引发的海啸。全基因组和线粒体DNA分析可能揭示出克罗克氏北蝽强烈的遗传分化和减少的遗传多样性，表明种群瓶颈和适应性转变。然而，由于亲代抚育和性别偏倚的分散，棘豆可能表现出基因组弹性，线粒体分化适度，干扰后母系多样性增加。功能注释突出了应激反应、代谢适应和线粒体可塑性的可能特征。这些发现可能强调了生态特征、环境压力源和遗传机制之间复杂的相互作用，这些因素推动了海洋系统中种群的恢复力和结构。

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引用次数: 0

Relationships of the summer nutrient concentrations in the East China Sea with the Changjiang diluted water, upwellings and Kuroshio intrusion, from an interannual perspective 东海夏季营养物浓度与长江稀释水、上升流和黑潮入侵的年际关系

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-28 DOI: 10.1016/j.marenvres.2026.107891

Qingling Zhang , Xinyan Mao , Yifei Luo , Xinyu Guo , Jie Shi

In summer, the East China Sea (ECS) faces ecological challenges like harmful algal blooms, hypoxia, and jellyfish blooms, linked to nutrient distributions influenced by Changjiang Diluted Water (CDW), Kuroshio intrusion, and Zhejiang Coastal Upwelling (ZCU). The inconsistent interannual variations of these processes complicate nutrient dynamics. This study used the Empirical Orthogonal Function (EOF) analysis to reveal the interannual variations (1993–2022) of summer dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) concentrations in the ECS. We demonstrated that interannual variability in southerly wind strength was a key regulator controlling the relative influence of CDW and ZCU on surface nutrients. Weaker southerly wind combined with stronger Changjiang discharge (e.g., 1999, 2002, 2020) enhanced the nearshore influence of CDW and reduced the ZCU intensity. This suppressed DIP supply and biological consumption of DIN, leading to accumulated surface DIN but depleted surface DIP in the Zhejiang Coastal (ZC) region. Conversely, stronger southerly wind combined with stronger Changjiang discharge drove the CDW moving offshore that increased offshore DIN concentrations. Simultaneously, the stronger southerly wind also intensified ZCU that enhanced coastal DIP supply and biological DIN uptake, resulting in reduced coastal surface DIN. Critically, we identify the distinct drivers for bottom DIP. Weaker ZCU led to increasing (decreasing) of bottom DIP concentrations in an area deeper (shallower) than 20 m, while stronger Kuroshio intrusion substantially boosted bottom DIP, influencing productivity in both ZC region and the East Zhejiang coastal (EZC) region. The intricate interplay of these physically driven nutrient fluxes, characterized by differing N/P ratios, underpinned the ECS's complex and variable summer nutrient structures with profound implications for understanding its ecological responses.

在夏季，东海面临着有害藻华、缺氧和水母繁殖等生态挑战，这与长江稀释水（CDW）、黑潮入侵和浙江沿海上升流（ZCU）对营养物分布的影响有关。这些过程不一致的年际变化使养分动力学复杂化。本研究采用经验正交函数（EOF）分析，揭示了1993-2022年夏季ECS中溶解无机氮（DIN）和溶解无机磷（DIP）浓度的年际变化。结果表明，南风强度的年际变化是控制CDW和ZCU对地表养分相对影响的关键调节因子。较弱的南风与较强的长江流量（如1999年、2002年、2020年）相结合，增强了CDW对近岸的影响，减弱了ZCU强度。这抑制了DIP的供应和DIN的生物消耗，导致浙江沿海地区表面DIN积累而表面DIP耗竭。相反，较强的南风结合较强的长江流量驱动CDW向近海移动，使近海DIN浓度增加。同时，较强的南风也增强了ZCU，增加了海岸DIP供应和生物DIN吸收，导致海岸表面DIN减少。关键是，我们确定了底部DIP的不同驱动因素。较弱的ZCU导致20 m（浅）以下区域底部DIP浓度增加（减少），而较强的黑潮入侵显著提高了底部DIP浓度，影响了ZC区域和浙东沿海（EZC）区域的生产力。这些物理驱动的营养通量的复杂相互作用，以不同的N/P比率为特征，支撑了ECS复杂多变的夏季营养结构，对理解其生态反应具有深远的意义。

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引用次数: 0

Deeper waters, more calcifiers: Spatial variation in benthic assemblages highlight conservation challenges in sub-Antarctic Marine Protected areas 更深的水域，更多的钙化：底栖生物组合的空间变化突出了亚南极海洋保护区的保护挑战。

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2026-01-28 DOI: 10.1016/j.marenvres.2026.107889

Lucía Bergagna , Luciana Riccialdelli , Gustavo Lovrich , Gisela A. Morán , Laura Schejter , Gabriela Palomo , Ricardo Sahade

Marine Protected Areas (MPAs) aim to preserve species, habitats, and the Nature Contributions to People they support. In the sub-Antarctic MPAs Namuncurá – Burdwood Bank I and II, the primary conservation features are the rich and abundant benthic assemblages across two distinct habitats: the plateau and the slope of the bank. Currently, these MPAs face significant threats from anthropogenic CO₂ emissions, which drive climate change and ocean acidification processes. Here, we establish an ecological baseline by analysing the diversity and structural patterns of benthic assemblages to evaluate MPA effectiveness, monitor climate change impacts, and inform management strategies. Comparisons were performed across three areas: the MPA, the Beagle Channel, and the Atlantic shelf of Tierra del Fuego, and between zones and habitats within the MPA. Sampling was conducted at depths of 90–710 m using bottom trawls, with megafauna identified to the lowest possible taxonomic level. Uni- and multivariate analyses revealed marked differences across areas. A total of 236 taxa were distinguished, but only 16 were shared among all the three areas, while 167 were unique to the MPAs. The habitats were characterized by different biotas, with sponges (mainly Demospongiae) dominating shallower environments and calcifying taxa, such as corals and echinoderms, predominating in deeper habitats. High β-diversity turnover within the MPAs suggests that the current zonation may inadequately protect benthic habitats, which is further exacerbated by ocean acidification predictions. Our findings highlight the biodiversity and conservation value in two opensea sub-Antarctic MPAs, providing a basis for effective management and the assessment of ecological responses to environmental change.

海洋保护区（MPAs）旨在保护物种、栖息地以及它们所支持的自然对人类的贡献。在亚南极海洋保护区namuncura - Burdwood Bank I和II中，主要的保护特征是丰富的底栖生物组合跨越两个不同的栖息地：高原和河岸斜坡。目前，这些海洋保护区面临着人为二氧化碳排放的重大威胁，二氧化碳排放推动了气候变化和海洋酸化过程。在此，我们通过分析底栖生物群落的多样性和结构模式来建立生态基线，以评估海洋保护区的有效性，监测气候变化的影响，并为管理策略提供信息。在三个区域进行了比较：海洋保护区、比格尔海峡和火地岛的大西洋大陆架，以及海洋保护区内的区域和栖息地之间的比较。利用底拖网在90-710米的深度进行取样，在尽可能低的分类水平上确定了巨型动物。单变量和多变量分析显示了不同地区之间的显著差异。共鉴定出236个分类群，但3个地区共有的分类群只有16个，167个是保护区特有的。浅层以海绵类为主，深层以珊瑚、棘皮类等钙化类群为主。海洋保护区内β-多样性的高更替表明，目前的地带性可能无法充分保护底栖生物栖息地，海洋酸化预测进一步加剧了这一问题。本研究结果强调了两个亚南极公海海洋保护区的生物多样性和保护价值，为有效管理和评估生态对环境变化的响应提供了依据。

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引用次数: 0