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Lipid unsaturation correlates with population dynamics of the copepod Platychelipus littoralis in intertidal mudflats 潮间带泥滩滨海棕足类动物脂质不饱和与种群动态相关
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-29 DOI: 10.1016/j.ecss.2025.109691
Iene Herman , Bram Martin , Julieta Vigliano Relva, Anna-Maria Vafeiadou, Marleen De Troch
This study provides a one-year baseline dataset for the copepod species Platychelipus littoralis, one of the most abundant benthic copepods inhabiting intertidal mudflats in Western Europe. As a key member of the meiofaunal community, P. littoralis plays an essential role in the estuarine and coastal mudflat ecosystems, particularly through its interactions with microphytobenthos at the base of the food web. This study aims to track seasonal dynamics in the intertidal copepod community and identify key drivers of population abundance for this harpacticoid species. Absolute fatty acid concentrations and unsaturation of P. littoralis were maximal in winter and lowest in summer. The copepods’ fatty acids match the homeoviscous thermal adaptation response of diatoms as their main food source. Rather unusual for copepods, P. littoralis primarily reproduced in winter, with the number of egg-carrying females doubling and egg sacs being 50 % larger compared to summer. We hypothesized that this reproductive strategy maximalizes egg production by aligning with the seasonal availability of diatom-derived polyunsaturated fatty acids (PUFAs) during the colder winter months. During winter diatom blooms, P. littoralis reached up to 25 % of total copepod population abundance, with local variability driven by the mudflat patchiness. Its reproductive success appears to be indirectly temperature-dependent, suggesting a high vulnerability to rising seawater temperatures predicted under climate change scenarios. Given its large geographical range, its temperature sensitivity as a winter breeder, and close association with diatom fatty acid unsaturation, the species shows strong potential as an indicator species for climate change monitoring.
本研究为生活在西欧潮间带泥滩的最丰富的底栖桡足类动物之一——滨海Platychelipus littoralis提供了一年的基线数据。作为小动物群落的重要成员,滨草在河口和沿海滩涂生态系统中起着至关重要的作用,特别是通过与食物网底部的微底栖植物的相互作用。本研究旨在追踪潮间带桡足类群落的季节动态,并确定该物种种群丰度的关键驱动因素。脂肪酸绝对浓度和不饱和度在冬季最高,夏季最低。桡足类动物的脂肪酸符合硅藻作为其主要食物来源的自粘热适应反应。在桡足类动物中很不寻常的是,滨海滨虾主要在冬季繁殖,与夏季相比,携带卵子的雌性数量增加了一倍,卵囊增加了50%。我们假设,在寒冷的冬季,这种繁殖策略与硅藻衍生的多不饱和脂肪酸(PUFAs)的季节性可用性相一致,从而最大限度地提高了卵子产量。在冬季硅藻华期间,滨海沼虾种群丰度高达桡足类总种群丰度的25%,其局部变异受泥滩斑块的驱动。它的繁殖成功似乎间接依赖于温度,这表明在气候变化的情况下,海水温度上升对它们的影响很大。由于其广阔的地理范围、冬季繁殖的温度敏感性以及与硅藻脂肪酸不饱和的密切关系,该物种作为气候变化监测的指示物种具有很强的潜力。
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引用次数: 0
Deciphering gametogenic strategies of Perna viridis in a tropical estuarine ecosystem: Mechanistic links between fatty acid allocation and environmental synchrony 热带河口生态系统中绿滨螺配子发生策略的解读:脂肪酸分配与环境同步性之间的机制联系
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-29 DOI: 10.1016/j.ecss.2025.109687
Md Nayeem Hossain , Afshana Ferdous , Israt Jahan , Md Moshiur Rahman , Md Asaduzzaman
Understanding how monsoon-driven environmental variability and trophic interactions regulate fatty acid dynamics during gametogenesis is fundamental to linking marine bivalve reproductive strategies with ecosystem processes in coastal systems. This study assessed the gametogenic strategies of the green mussel, Perna viridis, through an integrative analysis of fatty acid dynamics between gonadal and somatic tissues, revealing the critical roles of trophic interactions and environmental factors in shaping its reproductive cycle in the southeastern Bay of Bengal. Fatty acid profiling demonstrated that polyunsaturated fatty acids (PUFAs), particularly eicosapentaenoic acid (C20:5n-3) and docosahexaenoic acid (C22:6n-3), accumulated substantially in body and gonad during developing and mature stages, whereas saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs) predominated in spawning stage. Transitional developmental stages exhibited initiation of lipid mobilization from body to gonad, while the spent stage showed diminished MUFAs and SFAs reserve, indicating expenditure of energy for somatic recovery. Multivariate analyses (PCA, PLS-DA) clearly separated gonadal and body tissues, with VIP scores highlighting C20:5n-3, C22:6n-3, and n-3 PUFAs as key discriminatory markers of reproductive activity. Volcano plots and heatmap analyses further confirmed dynamic shifts in lipid metabolism, with gonads consistently enriched in long-chain PUFAs relative to body tissues. Correlation analyses demonstrated strong synchrony between gonadal and somatic fatty acids, yet trophic linkages indicated that mussels derived essential fatty acids primarily from Bacillariophyceae, Chlorophyceae, Cyanophyceae, Pyrrophyceae, and zooplankton during favorable conditions, rather than depending on somatic reserves. This pattern reflects an opportunistic energy allocation strategy, whereby immediate dietary inputs fuel gamete maturation, contrasting with conservative schemes reported in many other bivalves. Collectively, these results highlight that reproductive success in P. viridis is shaped by a dynamic interplay between food availability, environmental variability, and fatty acids allocation, with opportunistic strategies ensuring reproductive efficiency under fluctuating environmental conditions. Overall, this work deepens mechanistic insights into the remarkable adaptability of reproductive strategies of green mussels to monsoon-driven stress in tropical coastal ecosystems, highlighting their resilience under fluctuating environmental conditions.
了解季风驱动的环境变化和营养相互作用如何调节配子体发生过程中的脂肪酸动态,是将海洋双壳类生殖策略与沿海系统生态系统过程联系起来的基础。本研究通过对孟加拉湾东南部绿贻贝(Perna viridis)性腺和体细胞组织间脂肪酸动态的综合分析,评估了绿贻贝的配子体发育策略,揭示了营养相互作用和环境因素在塑造其生殖周期中的关键作用。脂肪酸分析表明,多不饱和脂肪酸(PUFAs),特别是二十碳五烯酸(C20:5n-3)和二十二碳六烯酸(C22:6n-3),在发育和成熟阶段在体内和性腺中大量积累,而饱和脂肪酸(sfa)和单不饱和脂肪酸(MUFAs)在产卵阶段占主导地位。过渡发育阶段表现出从身体到性腺的脂质动员的启动,而消耗阶段表现出mufa和sfa储备的减少,表明身体恢复的能量消耗。多变量分析(PCA, PLS-DA)明确区分了性腺和身体组织,VIP评分突出了C20:5n-3, C22:6n-3和n-3 PUFAs作为生殖活动的关键区分标记。火山图和热图分析进一步证实了脂质代谢的动态变化,性腺相对于身体组织始终富含长链PUFAs。相关分析表明,生殖腺和躯体脂肪酸之间具有很强的同步性,但营养联系表明,贻贝在有利条件下主要从硅藻、绿藻、蓝藻、热藻和浮游动物中获取必需脂肪酸,而不是依赖于躯体储备。这种模式反映了一种机会主义的能量分配策略,即即时的饮食输入促进配子成熟,与许多其他双壳类动物报道的保守方案形成对比。总的来说,这些结果强调了绿假单胞虫的繁殖成功是由食物供应、环境变异性和脂肪酸分配之间的动态相互作用形成的,机会主义策略确保了在波动的环境条件下的繁殖效率。总的来说,这项工作加深了对热带沿海生态系统中绿贻贝生殖策略对季风驱动压力的显著适应性的机制见解,突出了它们在波动环境条件下的恢复能力。
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引用次数: 0
Abundance and characteristics of plankton and microplastics along the northern coastline of Central Java, Indonesia 印度尼西亚中爪哇北部海岸线浮游生物和微塑料的丰度和特征
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-27 DOI: 10.1016/j.ecss.2025.109688
Asriningsih Suryandari , Agoes Soegianto , Eko Prasetyo Kuncoro , Carolyn Melissa Payus , Retno Hartati
This study aimed to characterize microplastics (MPs) and analyze the composition of plankton in the coastal waters of Central Java's North Coast. The examined characteristics of MPs comprise type, color, size, polymer type, and chemical properties. The plankton samples were classified according to species and size. The study results indicated that the overall abundance of MPs (83 particles/L) across all locations in these coastal waters was significantly higher than that of plankton (57 individuals/L). The concentration of MPs ranged from 10 to 42 particles/L, with Jepara demonstrating the highest level at 42 particles/L. The distribution of plankton among all locations exhibited little variation, ranging from 13 to 15 ind/L at each site. The predominant size of both MPs and plankton was ≤1 mm. MPs measuring ≤1 mm constituted 98 % of the total MPs, whereas plankton of the same size represented 94.7 % of the total plankton. Copepods exhibited the most diversity in size classes, demonstrating abundance in greater categories (>1–2 mm and >4–5 mm), whilst other taxa primarily demonstrated abundance in the ≤1 mm size class. The study identified a variety of MPs, such as fibers, fragments, films, and pellets. Fibers (38.8 %) were the most prevalent form, followed by fragments (31.2 %) in all location. The most prevalent color was black, with 44.8 % of the total, while transparent was second at 29.6 %. Seven polymer types, including polyethylene (PE), polypropylene (PP), low-density polyethylene (LDPE), polystyrene (PS), polyethylene terephthalate (PET), polyurethane (PU), and polyacrylonitrile (PAN), were analyzed utilizing FTIR imaging, with PET being abundantly detected at all sampling sites. This research presents baseline data regarding the concurrent distribution of microplastics and plankton in the coastal waters of northern Central Java. The study enhances the understanding of microplastic dynamics in coastal environments through the comparison of quantitative abundance, size-class analysis, and FTIR-based polymer identification.
本研究旨在表征微塑料(MPs)并分析中爪哇北海岸沿海水域浮游生物的组成。MPs的检测特征包括类型、颜色、大小、聚合物类型和化学性质。浮游生物样本按种类和大小进行分类。研究结果表明,在这些沿海水域的所有地点,MPs的总体丰度(83个/L)显著高于浮游生物(57个/L)。MPs的浓度范围为10 ~ 42颗粒/L,其中Jepara的浓度最高,为42颗粒/L。各样点浮游生物的分布变化不大,在13 ~ 15 ind/L之间。MPs和浮游生物的优势尺寸均为≤1 mm。小于1 mm的浮游生物占总浮游生物的98%,而相同大小的浮游生物占总浮游生物的94.7%。桡足类以1 ~ 2 mm和4 ~ 5 mm的大尺寸为丰度,其他类群以≤1 mm的尺寸为丰度。该研究确定了多种MPs,如纤维、碎片、薄膜和颗粒。纤维(38.8%)是最常见的形式,其次是碎片(31.2%)。最流行的颜色是黑色,占总数的44.8%,其次是透明,占29.6%。利用FTIR成像分析了包括聚乙烯(PE)、聚丙烯(PP)、低密度聚乙烯(LDPE)、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯(PET)、聚氨酯(PU)和聚丙烯腈(PAN)在内的7种聚合物类型,在所有采样点都检测到大量的PET。这项研究提出了关于微塑料和浮游生物在中爪哇北部沿海水域同时分布的基线数据。该研究通过定量丰度、尺寸级分析和基于ftir的聚合物鉴定的比较,增强了对沿海环境中微塑料动力学的理解。
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引用次数: 0
Analysis of fisheries impact on the Vietnamese marine ecosystem based on a linear inverse model 基于线性逆模型的渔业对越南海洋生态系统影响分析
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-27 DOI: 10.1016/j.ecss.2025.109676
Trang Phuc-Hong Hoang , Samuel Guéret , Philippe Bogaerts
A model of the Vietnamese marine ecosystem is proposed to analyze the ecological development level in the decades 2000s and 2010s, the related causes and, especially, the fisheries impact. The ecosystem model consists of Linear Inverse Models (LIMs) that allow reconstructing carbon flows across five different trophic levels, computing four functional attributes, and estimating the fate of organic matter as well as the total system throughput of the ecosystem. The LIMs were solved to determine, on the one hand, the range of admissible solutions of each flux and, on the other hand, a Monte Carlo sampling of the polytope of flux solutions. From that sampling, the investigated functional attributes were consumption, egestion (flow to detritus), respiration and export. Based on the comparison of the total system throughput, fate of organic matter, and functional indices over the temporal periods, five conclusions are highlighted: (1) the flow of ecosystem energy in the 2010s period has increased by 32 % with respect to the previous decade; (2) catches of tunas, small pelagic fishes and cephalopods in the 2010s have significantly increased due to the La Niña phenomena, while other fisheries declined due to an increase of ocean temperature; (3) sea turtles in Vietnam are on the edge of extinction caused by tuna catches regardless of the recent raising awareness programs on protection and conservation; (4) the population of marine mammals on the coast of Vietnam up to the 2010s has decreased due to climate change, habitat destruction, overfishing, pollution and bycatch; (5) a contrasting sensitivity analysis between the 2000s and 2010s revealed reduced ecological resilience, calling for priority protection of vulnerable trophic groups.
本文提出了一个越南海洋生态系统模型,分析了2000年和2010年的生态发展水平、相关原因,特别是渔业影响。该生态系统模型由线性逆模型(LIMs)组成,该模型允许在五个不同的营养水平上重建碳流,计算四种功能属性,并估计有机物的命运以及生态系统的总系统吞吐量。求解lim一方面是为了确定每个通量的可容许解的范围,另一方面是为了确定通量解多面体的蒙特卡罗抽样。从该采样中,调查的功能属性是消耗,排泄(流向碎屑),呼吸和出口。通过对系统总通量、有机质通量和功能指标的比较,得出以下5个结论:(1)2010年代生态系统能量流量比前10年增加了32%;(2) 2010年代受La Niña现象影响,金枪鱼、小型远洋鱼类和头足类捕捞量显著增加,其他渔业捕捞量因海洋温度升高而下降;(3)越南的海龟由于金枪鱼捕捞而濒临灭绝,尽管最近提高了保护和养护意识;(4)受气候变化、栖息地破坏、过度捕捞、污染和副渔获等因素影响,2010年代以来越南沿海海洋哺乳动物数量呈下降趋势;(5) 2000年至2010年的敏感性对比分析表明,生态恢复力有所下降,应优先保护脆弱营养类群。
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引用次数: 0
Turbidity shapes the spatial diversity of the high-frequency dynamics of bottom layer dissolved oxygen in shallow coastal oceans 浊度决定了浅海近岸海域底层溶解氧高频动态的空间多样性
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-26 DOI: 10.1016/j.ecss.2025.109684
Yishan Wang , Changyuan Yan , Yanzhen Gu , Fangguo Zhai , Peiliang Li , Jianying Liu , Peidong Liu
High-frequency variations in bottom layer dissolved oxygen (DO) critically influence marine ecosystem metabolism and benthic habitats, yet their controlling mechanisms and spatial heterogeneity in shallow coastal oceans remain poorly understood. Based on four years of in-situ observations and high-resolution numerical simulations, this study systematically investigates the spatial diversity of high-frequency dynamics of bottom layer DO concentrations in the coastal oceans of China. The results show that the high-frequency fluctuations of bottom layer DO concentrations are most pronounced in summer and have two dominant frequency bands at diurnal and semi-diurnal periods. Further analyses indicate that bottom-layer DO concentrations are primarily influenced by diurnal variations in shallow waters with low turbidity, whereas semi-diurnal variations exert the strongest influence in high-turbidity environments. Model experiments further confirm turbidity as the key factor shaping the spatial diversity of high-frequency bottom DO dynamics by regulating underwater light availability and the relative importance of biogeochemical and physical processes. Under low-turbidity conditions, sufficient light penetration enhances near-bottom photosynthesis, leading to diurnal dominance. In contrast, under high-turbidity conditions, strong light limitation suppresses biological regulation, allowing semi-diurnal tidal mixing to become the dominant driver of bottom-layer DO variability. Overall, this study underscores the pivotal role of turbidity in mediating the balance between tidal dynamics and biogeochemical processes, offering new insights into high-frequency oxygen variability in shallow coastal oceans.
海底溶解氧(DO)的高频变化严重影响海洋生态系统代谢和底栖生物栖息地,但其在浅海沿岸的控制机制和空间异质性尚不清楚。基于4年的原位观测和高分辨率数值模拟,系统研究了中国沿海海洋底层DO浓度高频动态的空间多样性。结果表明:夏季水体底层DO浓度的高频波动最为明显,在日较日和半日较日存在两个主导频带;进一步分析表明,在低浑浊度的浅水中,底层DO浓度主要受日变化的影响,而在高浑浊度环境中,半日变化的影响最大。模型实验进一步证实,浊度通过调节水下光可用性以及生物地球化学和物理过程的相对重要性,是塑造高频海底DO动态空间多样性的关键因素。在低浊度条件下,充足的光穿透增强了近底光合作用,导致昼夜优势。相反,在高浊度条件下,强光限制抑制了生物调节,使半日潮混合成为底层DO变率的主要驱动因素。总体而言,本研究强调了浊度在调节潮汐动力学和生物地球化学过程之间平衡中的关键作用,为浅海沿岸海洋高频氧变化提供了新的见解。
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引用次数: 0
Environmental and human impacts on fish assemblages in shallow bay areas of South-eastern Brazil 环境和人类对巴西东南部浅海湾地区鱼类群落的影响
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-26 DOI: 10.1016/j.ecss.2025.109683
Wagner Uehara, Gustavo Henrique Soares Guedes, Marcia Cristina Costa de Azevedo, Victória de Jesus Souza, Francisco Gerson Araújo
Environmental and human influences strongly shape fish assemblages in coastal marine ecosystems, yet their combined effects remain unclear. This study examines how anthropogenic activities and environmental variables (e.g., salinity, substrate roughness, beach dimensions, and water renewal) influence fish assemblage descriptors (species composition, abundance, richness, taxonomic diversity, and trophic guilds) in two bays, two types of sandy beaches (continental vs. insular), across two seasons (winter and summer) in southeastern Brazil. We hypothesized that (H1) fish assemblage characteristics vary between bays, beach types, and seasons due to differing environmental features, and (H2) ecological and anthropogenic factors have distinct effects on assemblage descriptors. We conducted 312 beach-seine samples and analyzed the data using PERMANOVA and Generalized Additive Mixed Models (GAMMs). Results show that fish assemblages differ significantly by bay, beach type, and season, with significant interactions between bays and beach types, supporting H1. Fish abundance and richness, as well as the abundance of benthivorous and planktivorous species, were higher on continental beaches. Environmental factors differentially influenced assemblage descriptors, supporting H2. For example, human impact (Human Footprint Index) was a major predictor of fish abundance, richness, and specific trophic guilds (e.g., planktivores and opportunists). Species richness peaked at intermediate salinity (∼30), substrate roughness positively affected planktivores but negatively affected benthivorous, beach length was negatively associated with total abundance and opportunistic species, and depth negatively correlated with taxonomic distinctness and benthivore abundance. These findings highlight the role of local environmental conditions in structuring fish assemblages and emphasize the need for conservation strategies that preserve habitat complexity in tropical marine ecosystems.
环境和人类影响强烈地塑造了沿海海洋生态系统中的鱼类组合,但它们的综合影响尚不清楚。本研究考察了巴西东南部两个海湾、两种类型的沙滩(大陆与岛屿)、两个季节(冬季和夏季)的人为活动和环境变量(例如盐度、基质粗糙度、海滩尺寸和水体更新)如何影响鱼类组合描述子(物种组成、丰度、丰富度、分类多样性和营养行会)。我们假设(H1)由于环境特征的不同,不同海湾、海滩类型和季节的鱼类组合特征不同;(H2)生态和人为因素对组合描述符有不同的影响。我们采集了312个海滩围网样本,使用PERMANOVA和广义加性混合模型(GAMMs)对数据进行了分析。结果表明,不同海湾、不同海滩类型和不同季节的鱼类组合存在显著差异,且海湾和海滩类型之间存在显著的相互作用,支持H1。鱼类的丰度和丰富度,以及底栖和浮游生物物种的丰度,在大陆海滩较高。环境因素对组合描述符的影响不同,支持H2。例如,人类影响(人类足迹指数)是鱼类丰度、丰富度和特定营养行会(如浮游动物和机会主义者)的主要预测指标。物种丰富度在中等盐度(~ 30)时达到峰值,基质粗糙度对浮游动物有积极影响,但对底栖动物有消极影响,海滩长度与总丰度和机会性物种呈负相关,深度与分类独特性和底栖动物丰度呈负相关。这些发现突出了当地环境条件在鱼类组合结构中的作用,并强调了保护热带海洋生态系统中栖息地复杂性的保护策略的必要性。
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引用次数: 0
Corrigendum to “Implications of surface modifying on seawall hydrodynamics performance: Reflection and run-up / down” [Estuarine, Coastal and Shelf Science (329), February 2026, 109666, Received 30 September 2025, Revised 12 December 2025, Accepted 12 December 2025, Available online 13 December 2025, Version of Record 13 December 2025] “表面修饰对海堤流体力学性能的影响:反射和上升/下降”的勘误表[河口,海岸和大陆架科学(329),20262,109666,2025年9月30日接收,2025年12月12日修订,2025年12月12日接受,2025年12月13日在线提供,2025年12月13日记录版本]
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-25 DOI: 10.1016/j.ecss.2025.109682
May R. ElKotby , Omnia Abouelsaad , Ali Masria
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引用次数: 0
Spatiotemporal patterns and environmental drivers of Physalia physalis strandings along mainland Portugal (northeastern Atlantic) 葡萄牙大陆(大西洋东北部)Physalia physalis搁浅的时空格局及环境驱动因素
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-23 DOI: 10.1016/j.ecss.2025.109674
Patrícia Carvalho , Clara Cordeiro , Soraia Pereira , Antonina dos Santos
Physalia physalis is a cosmopolitan colonial organism frequently observed in Portuguese waters. The species has long tentacles, provided with cnidocytes, which release a strong poison when in contact with other organisms, and cause skin reactions and severe pain in humans. Events of rapid reproduction, common in these species, may have important economic and social consequences. This study explores for the first time, the relationships between long-term assessment of P. physalis strandings, using data from the GelAvista citizen science project, and environmental variables - Sea Surface Temperature (SST), wind direction and intensity, the North Atlantic Oscillation (NAO), and upwelling indices - along the Portuguese coast, using a Generalized Linear Mixed-Effects Model.
Strandings of P. physalis were concentrated along the western coast and were rare in the south. More than 54 % of the records corresponded to a single individual. Sightings peaked from November through May (winter and spring), mirroring the negative correlation with SST. Wind patterns strongly influenced stranding events: winds likely pushed colonies toward the shore, while calm conditions facilitated their arrival on beaches. In March 2018, an upwelling event in the south coast combined with a series of storms likely underlay the high stranding numbers observed in the southern area, with more than 50 individuals of P. physalis per record.
A positive trend in sightings over the study period suggests that P. physalis occurrences may be rising, even after accounting for wind and SST, which might be linked to climate change. Our findings underscore the value of ongoing jellyfish monitoring via citizen science platforms like GelAvista and highlight the need for expanded high-resolution environmental datasets. Moreover, this work establishes a foundation for experimental studies to elucidate the mechanisms behind P. physalis strandings. For future research, time series techniques for imputing missing values may be utilized to enhance the completeness of environmental datasets and strengthen analytical robustness in subsequent studies focused on time series analysis.
Physalia physalis是一种在葡萄牙水域经常观察到的世界性殖民地生物。这个物种有长长的触手,上面有刺丝细胞,当与其他生物接触时,刺丝细胞会释放出强烈的毒素,并引起皮肤反应和人类的剧烈疼痛。在这些物种中常见的快速繁殖事件可能会产生重要的经济和社会后果。本研究首次使用广义线性混合效应模型,利用GelAvista公民科学项目的数据,探索了葡萄牙海岸对physalis搁浅的长期评估与环境变量(海表温度(SST)、风向和强度、北大西洋涛动(NAO)和上升流指数)之间的关系。physalis的搁浅主要集中在西海岸,在南部很少见。超过54%的记录对应于单个个体。目击高峰从11月到5月(冬季和春季),反映了与海温的负相关。风的模式强烈地影响了搁浅事件:风可能会把殖民地推向海岸,而平静的条件则有助于它们到达海滩。2018年3月,南海岸的上涌事件加上一系列风暴可能是南部地区观察到的高搁浅数量的基础,每次记录有超过50只physalis个体。在研究期间,一个积极的趋势表明,即使在考虑了可能与气候变化有关的风和海温之后,physalis的发生率可能正在上升。我们的研究结果强调了通过公民科学平台(如GelAvista)持续监测水母的价值,并强调了扩展高分辨率环境数据集的必要性。此外,这项工作为实验研究奠定了基础,以阐明物理假单胞菌搁浅的机制。在未来的研究中,可以利用缺失值的时间序列技术来提高环境数据集的完整性,并在后续的时间序列分析研究中增强分析的鲁棒性。
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引用次数: 0
Sediment mixing across heterogeneous benthic habitats: environmental and faunal controls along multiple gradients 异质性底栖生物栖息地的沉积物混合:沿多个梯度的环境和动物控制
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-23 DOI: 10.1016/j.ecss.2025.109677
Marta Szczepanek , Emma Michaud , Marc J. Silberberger , Monika Kędra
In this study, we present a comprehensive, seasonal assessment of sediment reworking across heterogeneous benthic habitats along the southern coast of the Baltic Sea. By integrating sediment mixing metrics based on tracer profiles (biodiffusion coefficient Db, non-local mixing coefficient r, and effective mixing depth L) with macrofaunal community structure, vertical distribution of functional groups, and bioturbation potential of community (BPc), we identified key drivers of sediment mixing in a region subjected to strong natural and anthropogenic gradients. Our results demonstrate that both the magnitude and mode of bioturbation are primarily governed by sediment type and local environmental settings, with cohesive muds dominated by shallow, non-local mixing, and fine sands additionally supporting biodiffusive transport. Notably, gallery-diffusors emerged as key drivers of non-local mixing, independent of broader community composition or habitat type. However, sites with reduced faunal biomass and diversity, particularly under hydrodynamic or oxygen stress, exhibited minimal mixing depths and low BPc, underscoring the functional consequences of community simplification. Despite its utility as a trait-based proxy, BPc showed only moderate correlation with sediment mixing metrics, emphasizing the importance of context-dependent environmental settings, including seasonal changes in food supply. Altogether, our findings enhance understanding of the environmental and faunal controls on sediment mixing in low-salinity coastal systems, across structurally and functionally diverse benthic habitats.
在这项研究中,我们对波罗的海南部海岸异质底栖生物栖息地的沉积物改造进行了全面的季节性评估。通过将基于示踪剖面的沉积物混合指标(生物扩散系数Db、非局部混合系数r和有效混合深度L)与大型动物群落结构、功能群垂直分布和群落生物扰动潜力(BPc)相结合,我们确定了受强自然和人为梯度影响的地区沉积物混合的关键驱动因素。我们的研究结果表明,生物扰动的大小和模式主要受沉积物类型和当地环境条件的控制,粘性泥浆主要是浅层的,非局部混合,细砂也支持生物扩散运输。值得注意的是,画廊扩散器成为非本地混合的关键驱动因素,独立于更广泛的群落组成或栖息地类型。然而,动物生物量和多样性减少的地点,特别是在水动力或氧胁迫下,表现出最小的混合深度和低BPc,强调了群落简化的功能后果。尽管BPc作为一种基于特征的代理工具,但它与沉积物混合指标只有适度的相关性,这强调了与环境相关的环境设置的重要性,包括食物供应的季节性变化。总之,我们的研究结果增强了对低盐度沿海系统中沉积物混合的环境和动物控制的理解,跨越了结构和功能多样化的底栖动物栖息地。
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引用次数: 0
Before the bloom: How pre-winter conditions influence jellyfish production 开花前:冬前环境如何影响水母的生产
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2025-12-23 DOI: 10.1016/j.ecss.2025.109679
D. Ford, N.E.C. Fleming
Jellyfish are being increasingly targeted by fisheries, but their complex life cycles make it difficult to predict stock availability. The seasonal recruitment of juvenile jellyfish (ephyrae) is regulated by the reproductive output of the benthic polyp life stage. Within temperate environments, polyps typically undergo strobilation and produce ephyrae in spring. While previous works have documented how winter conditions can influence strobilation success, the potential role of pre-winter environmental conditions on ephyra production remains unknown. This research investigated a well-studied jellyfish species of bioresource interest (Aurelia aurita) in a multi-phase experiment designed to a) quantify the effects of temperature and food availability on polyp development, and b) determine how the environmental conditions in which polyps were reared influence ephyra production and size following a controlled winter simulation. The results demonstrated that warmer pre-winter conditions not only enhanced initial somatic growth rates and bud production, but also increased the likelihood of mature polyps strobilating after temperatures had been reduced. Although polyps grew larger and subsequently produced more ephyrae when pre-winter food availability was increased, the likelihood of strobilation and total ephyra production of polyp populations was unaffected by previous feeding regimes. There was also no relationship between the diameter of parent polyps prior to winter simulation and the mean diameter of their ephyra progeny. Warmer pre-winter conditions could promote strobilation by increasing development rates or strengthening the environmental stimulus when temperatures decrease. These results demonstrate the potential value of considering pre-winter temperature when forecasting the recruitment of jellyfish stocks during summer.
水母越来越多地成为渔业的目标,但它们复杂的生命周期使得很难预测种群的可用性。幼水母的季节性招募是由底栖水螅生命阶段的生殖输出调节的。在温和的环境中,珊瑚虫通常在春天进行交配并产生苔藓。虽然以前的工作已经记录了冬季条件如何影响杂交成功,但冬前环境条件对麻黄生产的潜在作用仍然未知。本研究对一种具有生物资源价值的水母(Aurelia aurita)进行了多阶段实验,旨在a)量化温度和食物供应对水螅发育的影响,b)在受控的冬季模拟中确定水螅生长的环境条件如何影响水螅的产量和大小。结果表明,温暖的冬前条件不仅提高了初始体细胞生长速率和芽产量,而且增加了温度降低后成熟息肉的可能性。虽然当冬前食物供应增加时,息肉变大并随后产生更多的前驱虫,但息肉种群的交配和总前驱虫产量的可能性不受先前喂养制度的影响。在冬季模拟前亲代息肉的直径与其子代的平均直径之间也没有关系。当温度降低时,温暖的冬前条件可以通过增加发育速率或加强环境刺激来促进突变。这些结果表明,在预测夏季水母种群的补充时,考虑冬前温度的潜在价值。
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引用次数: 0
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Estuarine Coastal and Shelf Science
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