Ecohydrology & Hydrobiology最新文献_第6页

Ecohydrological impacts of Manjil Dam flushing on the downstream Sefidrud River and two coastal lagoons of the Southern Caspian Sea 曼吉尔大坝冲水对塞菲鲁德河下游和南里海两个沿海泻湖的生态水文影响

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100680

Saeed Poorasadollah , Ziaoddin Shoaei , Mohsen Shariat Jafari , Ali Sorbi

The ecohydrological consequences of dam sediment flushing remain poorly understood, particularly in lowland rivers and coastal systems. This study investigates the long-term impacts of uncontrolled flushing operations from the Manjil Dam on the downstream Sefidrud River and the ecologically sensitive Kiashahr and Zibakenar lagoons along the southern Caspian Sea. Using hydrochemical analyses, sediment core data, and satellite-derived indices of turbidity and eutrophication, we demonstrate that sediment flushing significantly altered riverine and lagoonal processes. Flushing-induced sediment discharge peaked at 8.3 times that of non-flushing days, raising suspended sediment concentrations above ecologically critical thresholds. These pulses led to widespread mass fish mortality and the degradation of benthic communities. Hydrochemical signatures shifted markedly, with elevated total dissolved solids, salinity, and ion concentrations, particularly Na⁺, Cl⁻, driven by evaporite dissolution and sediment remobilization. Remote sensing revealed a strong correlation between riverine turbidity and chlorophyll-a concentrations, evidencing enhanced eutrophication in the lagoons. Sediment core analysis confirmed long-term ecological degradation through the disappearance of charophytes and benthic foraminifera and the formation of azoic layers. Flushing disrupted natural flow regimes, shortened low-flow periods, and altered estuarine morphology. Despite rising Caspian Sea levels, accelerated sedimentation led to a 91 % and 32 % reduction in the area of Kiashahr and Zibakenar lagoons, respectively. A large portion of flushed sediments settled in the riverbed, elevating downstream suspended sediment concentration above upstream levels during non-flushing days, prolonging biotic stress. These findings reveal the lasting ecohydrological impacts of sediment flushing, highlighting its role in degrading the health and biodiversity of the freshwater-to-coastal continuum.

大坝沉积物冲刷的生态水文后果仍然知之甚少，特别是在低地河流和沿海系统。本研究调查了Manjil大坝不受控制的冲刷作业对下游Sefidrud河以及沿里海南部生态敏感的Kiashahr和Zibakenar泻湖的长期影响。利用水化学分析、沉积物核心数据和卫星衍生的浊度和富营养化指数，我们证明了沉积物冲刷显著改变了河流和泻湖的过程。冲水引起的沉积物排放量达到非冲水天数的8.3倍，使悬浮沉积物浓度超过生态临界阈值。这些脉冲导致广泛的鱼类大量死亡和底栖生物群落的退化。水化学特征发生了明显的变化，随着溶解固体总量、盐度和离子浓度的升高，尤其是Na +、Cl⁻，在蒸发岩溶解和沉积物再活化的作用下发生了变化。遥感显示，河流浊度与叶绿素-a浓度之间存在很强的相关性，证明了泻湖富营养化的加剧。沉积物岩心分析证实了长期的生态退化，主要是通过绿叶植物和底栖有孔虫的消失和无氮层的形成。冲积破坏了自然流态，缩短了低流量期，改变了河口形态。尽管里海水位上升，但加速的沉积导致Kiashahr和Zibakenar泻湖的面积分别减少了91%和32%。大部分冲刷后的沉积物在河床上沉淀，使下游悬浮沉积物浓度在非冲刷日高于上游水平，延长了生物压力。这些发现揭示了沉积物冲刷的持久生态水文影响，突出了其在降低淡水-海岸连续体的健康和生物多样性方面的作用。

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引用次数: 0

Impact of environmental selection on spatial heterogeneity of summer phytoplankton community in Pearl River Estuary, China 环境选择对珠江口夏季浮游植物群落空间异质性的影响

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100695

Chunhui Xiong , Chuqian Lu , Houlei Jia , Tao Liu , Zhenxiong Yang , Wei Deng , Zhiming Guo , Yinghua Huang , Yuhong Zhong , Tuanjie Li

Beta diversity (β) refers to the spatial variation in species composition, and understanding its patterns and the driving factors is crucial for comprehending biodiversity. To accurately analyze the factors influencing the maintenance of phytoplankton β diversity in the Pearl River Estuary (PRE), we employed Generalized Dissimilarity Modeling (GDM) to assess the relative importance of environmental and spatial processes. Our findings indicated that both environmental selection and spatial processes shape β diversity, with environmental selection exerting a predominant influence in the PRE. The spatial heterogeneity of phytoplankton in the PRE is affected by both natural and anthropogenic factors. Salinity is the primary driver, followed by transparency, suspended solids, and nutrients. As a distance-based nonlinear regression method, GDM effectively identified community variation of phytoplankton along environmental and spatial gradients. This study provides valuable insights for policy-making and management decisions by the relevant administrative bodies within the PRE.

β多样性（Beta diversity, β）是指物种组成的空间变异，了解其格局及其驱动因素是理解生物多样性的关键。为了准确分析珠江口（PRE）浮游植物β多样性维持的影响因素，采用广义不相似模型（GDM）对环境过程和空间过程的相对重要性进行了评价。研究结果表明，环境选择和空间过程共同塑造了β多样性，其中环境选择在PRE中发挥了主导作用。浮游植物的空间异质性受到自然和人为因素的双重影响。盐度是主要驱动因素，其次是透明度、悬浮物和营养物质。GDM是一种基于距离的非线性回归方法，能有效识别浮游植物群落沿环境和空间梯度的变化。这项研究为PRE内有关行政机构的决策和管理决策提供了宝贵的见解。

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引用次数: 0

Modeling hydrological conditions of oxbow lakes and assessing its effect on carbon sequestration in Diara Ganges plain 迪亚拉恒河平原牛轭湖水文条件模拟及其对碳固存的影响

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100687

Ripan Ghosh, Somnath Saha, Manashi Haldar, Sandipta Debanshi, Swades Pal

Hydrologically irregular, shallower wetlands particularly in isolated oxbow lakes are frequently overlooked due to their low provisioning services neglecting their role towards regulating services. The present study aimed to explore how hydrological condition of oxbow lakes in Diara floodplain of Ganges plain controls carbon sequestration. Both remote sensing and field data were taken for this. Water presence frequency (WPF), hydro-period (HP) and water depth (WD) were taken for developing analytical hierarchy process (AHP)-based weighted water richness (WR) model of from 1991 to 2023. Carbon sequestration was estimated using spectral vegetation index (Normalized difference vegetation index (NDVI)) and field-driven biomass coupled regression. Association between WR and Carbon (C) sequestration was done using correlation and Ordinary least square (OLS) regression approach. Study revealed significant areal shrinkage and seasonal dynamics in hydrological condition. WR model exhibited about 50 % drop area under good WR zone. Total estimated C sequestration potentiality is 1.3 × 10*³ Mg and 1.1 × 10*³ Mg in the cycle I and II with higher in winter and summer seasons. Association between predicted WR and C sequestration reported that low WR condition is more potential for C sequestration due to higher growth of vegetation. These findings indicate that hydrologically poorer wetlands are ambient for vegetation growth which makes it an effective sink of carbon and therefore should be also be preserved amid climate change scenario. For instance, good WR area could be focused for livelihood supporting fishing and poor WR area could be used for carbon sink.

水文不规则、较浅的湿地，特别是在孤立的牛轭湖中，由于其供应服务低而经常被忽视，忽视了它们在调节服务方面的作用。本研究旨在探讨恒河平原Diara漫滩牛轭湖的水文条件对碳固存的控制作用。为此采用了遥感和实地数据。采用1991 - 2023年的水存在频率（WPF）、水周期（HP）和水深（WD）建立了基于层次分析法（AHP）的加权水丰富度（WR）模型。利用光谱植被指数（归一化植被指数（NDVI））和野外驱动的生物量耦合回归估算了碳固存。利用相关和普通最小二乘（OLS）回归分析了WR与碳(C)固存之间的关系。研究结果表明，流域水文条件具有明显的面积收缩和季节动态特征。WR模型在良好的WR区下，下降面积约为50%。循环ⅰ和循环ⅱ的总碳固存潜力分别为1.3 × 10* 3mg和1.1 × 10* 3mg，冬、夏两季碳固存潜力较高。预测WR与碳固存的关联表明，低WR条件下由于植被生长旺盛，碳固存的潜力更大。这些发现表明，水文条件较差的湿地是植被生长的环境，使其成为有效的碳汇，因此在气候变化情景下也应加以保护。例如，良好的水域可重点用于生计支持渔业，而较差的水域可用于碳汇。

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引用次数: 0

The role of crustacean zooplankton in water quality monitoring: Findings from two Portuguese reservoirs 甲壳类浮游动物在水质监测中的作用：来自两个葡萄牙水库的发现

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100646

Ivo Pinto , Luísa Azevedo , Sara C. Antunes

Zooplankton is a key biological element in the aquatic food web. Although currently the European Water Framework Directive (WFD) does not include zooplankton in the biological assessments, the investigation of its potential contribution to water quality is crucial for an integrated evaluation of aquatic ecosystems. For one year, zooplankton communities from Portuguese reservoirs Rabagão and Aguieira, were sampled seasonally and characterized with several metrics and indexes (proportion of Calanoid/Cyclopoid ratios, feeding strategies and Zooplankton Reservoir Trophic Index - ZRTI). This strategy aimed to evaluate the ability of these endpoints to detect differences among trophic status and ecological potential in heavily modified water bodies. The two target reservoirs presented different classifications according to the WFD. Rabagão has good ecological potential, with higher Calanoid/Cyclopoid ratios and a greater proportion of large Cladocera to total Cladocera. On the other hand, Aguieira showed a poor ecological potential, mainly due to high phosphate concentrations, as well as low quality of phytoplankton (e.g., cyanobacteria concentration). In this reservoir, a greater abundance and diversity of zooplankton, was observed, which include highly efficient filter feeders organisms. Additionally, the ZRTI proved to be a sensitive discriminating element regarding the zooplankton community, which vary according to the quality of the two studied reservoirs. Our data, although limited to two reservoirs, indicate that ZRTI can complement the information given by the phytoplankton community in the water reservoir evaluation and, can be included in monitoring programs providing an effective indicator of bottom-up and top-down water quality.

浮游动物是水生食物网中的关键生物元素。尽管目前《欧洲水框架指令》（WFD）并未将浮游动物纳入生物评价，但调查其对水质的潜在贡献对于水生生态系统的综合评价至关重要。对葡萄牙rabag o和Aguieira水库的浮游动物群落进行了为期一年的季节性采样，并采用若干指标和指标（类Calanoid/ cyclopooid比值、摄食策略和浮游动物水库营养指数- ZRTI）对其进行了表征。该策略旨在评估这些端点在重度改造水体中检测营养状况和生态潜力差异的能力。根据WFD，两个目标储层呈现出不同的分类。rabag具有良好的生态潜力，类callanoid / cyclopooid比值较高，大型枝目占总枝目的比例较大。另一方面，Aguieira显示出较差的生态潜力，主要是由于磷酸盐浓度高，以及浮游植物质量低（如蓝藻浓度）。在这个水库中，观察到更丰富和多样性的浮游动物，其中包括高效滤食性生物。此外，ZRTI被证明是浮游动物群落的敏感区分因子，浮游动物群落因两个研究水库的质量而异。虽然我们的数据仅限于两个水库，但表明ZRTI可以补充浮游植物群落在水库评价中的信息，并且可以纳入监测方案，为自下而上和自上而下的水质提供有效指标。

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引用次数: 0

Spatio-temporal patterns of habitat suitability for two exotic fishes under climate change in a tropical river basin 气候变化下热带河流流域两种外来鱼类生境适宜性的时空格局

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100704

Arvind Kumar Dwivedi , Kritish De

Climate change and exotic species cumulatively poses a significant threat to global biodiversity, particularly in tropical regions, leading to substantial ecosystem alterations. Exotic fishes impact over half of the world's river basins, but studies on their climatic suitability are limited, especially in India. In this study we used the Random Forest species distribution model to examine the current and future climatically suitable areas for two exotic fish species, Common Carp (Cyprinus carpio) and Mozambique Tilapia (Oreochromis mossambicus) in the Bhima River basin of the Deccan Plateau, India. Our findings indicate an expansion of moderately suitable habitats over time, providing new colonization areas for these fishes. The majority of suitable climatic zones are in the arid and semi-arid regions of the lower Bhima River basin. Minimal overlap in climatic niches suggests limited interspecific competition, potentially allowing wider spread without direct competition. Increased climatic niche overlap may facilitate coexistence through efficient resource partitioning. Understanding effect of climate change on these exotic fish species' distribution is essential to mitigate their impact on aquatic ecosystems. Further research is recommended to assess the population and evaluate climatic and trophic niche dynamics of these exotic species for their better management practices in large river basins.

气候变化和外来物种累积起来对全球生物多样性构成重大威胁，特别是在热带地区，导致大量的生态系统改变。外来鱼类影响着世界上一半以上的河流流域，但对其气候适应性的研究有限，特别是在印度。本研究采用随机森林物种分布模型对印度德干高原Bhima河流域两种外来鱼类鲤鱼（Cyprinus carpio）和莫桑比克罗非鱼（Oreochromis mossambicus）的当前和未来气候适宜区进行了研究。我们的研究结果表明，随着时间的推移，适度适宜的栖息地不断扩大，为这些鱼类提供了新的定居区域。大部分适宜的气候带位于比马河下游的干旱和半干旱地区。气候生态位的最小重叠表明种间竞争有限，可能允许在没有直接竞争的情况下更广泛的传播。增加的气候生态位重叠可以通过有效的资源分配促进共存。了解气候变化对这些外来鱼类分布的影响对减轻其对水生生态系统的影响至关重要。建议进一步研究这些外来物种的种群数量、气候和营养生态位动态，以便在大流域进行更好的管理。

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引用次数: 0

Exploring a method for evaluating regional ecological water demand and its satisfaction degree: A case study of the Hanjiang River Basin, China 区域生态需水量及其满足度评价方法探讨——以汉江流域为例

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100666

Hailong Yu , Guangming Yu , Daman Yang , Fan Yu , Jing Guo , Yong Fan , Di Lu

Ecological water demand is an important aspect for the research of water supply-demand balance, which has a significant impact on regional ecological security and sustainable development. Although many ecological water demand models have been explored, a unified and complete regional ecological water demand model (REWD) has not yet been formed due to insufficient understanding of the connotation and composition of ecological water demand. Therefore, we redefine and clarify the composition of regional ecological water demand from the perspective of ecosystem division, and divide regional ecological water demand into biological water demand (BWD) and abiotic water demand (AWD). On this basis, a comprehensive regional ecological water demand model was constructed, which includes two major parts: the biological water demand model and the abiotic water demand model. The article applied the model to calculate and evaluate the ecological water demand in the Hanjiang River Basin (HRB), and estimated the ecological water-satisfied degree in the study area. The results show that, the range of ecological water demand in the study area is 481–2567,373 m³ /a, with the largest ecological water demand in the rivers and relatively small ecological water demand in the north-western region. The ecological water-satisfied degree in the HRB is basically above 100 percent, which is higher in the north-eastern and southern parts of the basin, and lower in the central and north-western areas. The integrated regional ecological water demand model is a unified and universal ecological water demand model, and the results can describe the spatial pattern of ecological water demand in a region and provide services for finer water resource regulation and allocation.

生态需水量是水资源供需平衡研究的一个重要方面，对区域生态安全和可持续发展具有重要影响。虽然已经探索了许多生态需水量模型，但由于对生态需水量的内涵和构成认识不足，尚未形成统一完整的区域生态需水量模型。因此，我们从生态系统划分的角度重新定义和厘清区域生态需水量的构成，将区域生态需水量划分为生物需水量（BWD）和非生物需水量（AWD）。在此基础上，构建了区域生态需水量综合模型，该模型包括两大部分：生物需水量模型和非生物需水量模型。应用该模型对汉江流域生态需水量进行了计算和评价，并对研究区生态水满足程度进行了估算。结果表明：研究区生态需水量为481 ~ 2567373 m3 /a，河流生态需水量最大，西北地区生态需水量相对较小；流域生态水满足程度基本在100%以上，东北部和南部较高，中部和西北部较低。综合区域生态需水量模型是一种统一的、通用的生态需水量模型，其结果可以描述区域生态需水量的空间格局，为更精细的水资源调控和配置提供服务。

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引用次数: 0

Occurrence and seasonal variability of analgesic and anti-inflammatory drugs (AAIDs) in the influent and effluent from WWTP in Słupsk (Poland) Słupsk（波兰）污水处理厂进水和流出物中镇痛和抗炎药物（AAIDs）的发生及季节变化

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.01.002

Marcin Stec , Aleksander Astel , Katarzyna Kamińska

The study aimed to seasonal monitoring of analgesic and anti-inflammatory drugs (AAID) in the wastewater influent and effluent. Samples were collected from the wastewater treatment plant (WWTP) in Słupsk for 12 months at two-week intervals. Analytes were extracted using solid phase extraction (SPE). Detection was carried out using the UHPLC-DAD system. Paracetamol (PARA), ibuprofen (IBU), ketoprofen (KET), diclofenac (DIC), naproxen (NPX), acetylsalicylic acid (ASA), and salicylic acid (SA) were detected in wastewater influent and effluent in the concentration range from 0.08 μg·L^–1 to 30.59 μg·L^–1. Determined concentrations were characterized by seasonal variability. The highest values were observed in the winter while the lowest in the summer. The removal efficiency (RE %) ranged from 76.1 % to > 99.9 % and was classified as high (> 70 %). The lowest average RE % was found for DIC (81.5 %), while the highest was for IBU (98.2 %). The most effective RE % was observed in the summer while the lowest was in the winter. An environmental risk assessment based on risk quotient (RQ) was accomplished to complement chemical analysis. Generally, the estimated RQ_effl values for AAIDs released from WWTP in Słupsk were classified as low-risk for the environment (RQ_effl < 0.1). However, in the case of fish embryos, a moderate risk was estimated for DIC, KET, and PARA.

本研究旨在对废水进出液中镇痛抗炎药（AAID）的季节性监测。从Słupsk的污水处理厂（WWTP）每隔两周采集样品，为期12个月。分析物采用固相萃取法（SPE）提取。采用UHPLC-DAD系统进行检测。对乙酰氨基酚（PARA）、布洛芬（IBU）、酮洛芬（KET）、双氯芬酸（DIC）、萘普生（NPX）、乙酰水杨酸（ASA）、水杨酸（SA）在废水进、出水中的浓度范围为0.08 ~ 30.59 μg·L-1。测定的浓度具有季节变化特征。冬季最高，夏季最低。去除率（RE %）范围为76.1% ~ 99.9%，为高去除率（RE %）；DIC的平均RE %最低（81.5%），IBU的平均RE %最高（98.2%）。有效RE %以夏季最高，冬季最低。基于风险商（RQ）的环境风险评价是对化学分析的补充。一般情况下，Słupsk地区污水排放对艾滋病的RQeffl估计值为低环境风险（RQeffl < 0.1）。然而，在鱼类胚胎的情况下，DIC、KET和PARA的风险估计中等。

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引用次数: 0

Exploring a large European river: Unraveling the spatial distribution and diversity of benthic invertebrates along the Vistula River (Poland) 探索一条欧洲大河：揭示维斯瓦河（波兰）沿岸底栖无脊椎动物的空间分布和多样性

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100681

Mariola Krodkiewska , Aneta Spyra , Adrianna Koczorowska , Bartosz Łozowski , Robert Czerniawski , Łukasz Sługocki , Marcin Libera , Andrzej Woźnica , Damian Absalon , Magdalena Matysik , Małgorzata Bąk , Edyta Sierka , Dariusz Halabowski , Anna Cieplok

Along with ongoing climate change, large rivers have experienced dramatic changes in conditions over time, subjected to multiple pressures and disturbances. A study on aquatic invertebrate linear diversity was conducted along the entire course of the large European Vistula River in Poland. The study aimed to evaluate which environmental variables are most important in determining diversity and variation in benthic communities from the upper to the lower parts of the river. A total of 39 macroinvertebrate taxa were recorded. Macroinvertebrate densities varied greatly, ranging from 93 to 19,200 individuals/m². Fourteen alien invertebrate species were identified, including oligochaetes (Branchiura sowerbyi), polychaetes (Leonome xeprovala), crustaceans (Chelicorophium curvispinum, Gyraulus tigrinus, Dikerogammarus villosus, Orconectes limosus), gastropods (Potamopyrgus antipodarum, Ferrissia wautieri, Physa acuta, Lithoglyphus naticoides), and bivalves (Dreissena polymorpha, Rangia cuneata, Corbicula fluminea, Sinanodonta woodiana). The proportion of alien species ranged from 0 % to over 99 %. Canonical Correspondence Analysis (CCA) revealed that conductivity, turbidity, pH, dissolved organic matter (DOM), and water oxygen content best explained the variation in the distribution of macroinvertebrate taxa in the Vistula River. Nereidae, Tatetidae, and Gammaridae were associated with high conductivity. In contrast, Gomphidae, Cyrenidae, Caenidae, and Ceratopogonidae were more abundant in well-oxygenated waters with higher turbidity. Some mollusk taxa (Viviparidae, Sphaeriidae, Dreissenidae, and Bithyniidae) were linked to higher levels of DOM. Our results support the conclusion that changing patterns in invertebrate composition along the course of large rivers reflect longitudinal changes in environmental pressures and conditions, providing valuable insight for evaluating changing climate and development.

随着气候的持续变化，大河的状况随着时间的推移经历了巨大的变化，受到多种压力和干扰。一项关于水生无脊椎动物线性多样性的研究沿着波兰的欧洲大河维斯瓦河的整个河道进行。该研究旨在评估哪些环境变量在决定从河流上游到下游底栖生物群落的多样性和变化方面最重要。共记录到39个大型无脊椎动物类群。大型无脊椎动物密度变化很大，在93 ~ 19200只/m2之间。鉴定出14种外来无脊椎动物，包括少毛纲动物（Branchiura sowerbyi）、多毛纲动物（Leonome xeprovala）、甲壳类动物（Chelicorophium curvispinum、Gyraulus tigrinus、Dikerogammarus villosus、Orconectes limmosus）、腹足类动物（potamopydarum、Ferrissia wautieri、Physa acuta、Lithoglyphus naticoides）和双壳类动物（Dreissena polymorpha、Rangia cuneata、Corbicula fluinea、Sinanodonta woodiana）。外来物种所占比例从0%到99%以上不等。典型对应分析（CCA）表明，电导率、浊度、pH、溶解有机物（DOM）和水氧含量是维斯瓦河大型无脊椎动物类群分布变化的最佳解释。neeidae， tetetidae和Gammaridae与高电导率相关。相比之下，Gomphidae、Cyrenidae、Caenidae和Ceratopogonidae在含氧良好、浊度较高的水体中数量较多。一些软体动物类群（胎胎动物科、球胎胎动物科、小胎胎动物科和双胎胎动物科）与较高水平的DOM有关。我们的研究结果支持这样的结论，即大型河流沿岸无脊椎动物组成的变化模式反映了环境压力和条件的纵向变化，为评估气候变化和发展提供了有价值的见解。

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引用次数: 0

Environmental degradation of Townsville coast and coastal waters of the Great Barrier Reef, Australia – findings and solutions 汤斯维尔海岸和大堡礁沿岸水域的环境退化-发现和解决办法

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100672

Eric Wolanski, Chris Hopper

The degradation of the Townsville coast and coastal waters of the Great Barrier Reef Marine Park ecosystem is severe. It involves, among several other symptoms, a large dam that traps riverine sand, land reclamation, extensive dredging, dumping of 400,000 m³/year of unconsolidated mud in coastal water, severe coastal erosion, sandy beaches turning muddy, healthy coral reefs turning to coral rubble, the decrease of water clarity of waters by 87 % since the 1960s, and a decrease of 80 % of the dugong population from 2016 to 2022. It is shown that this degradation is largely due to human activities on land and at sea. Climate change occurred later and is likely to impact mud and sand transport in the future. The degradation is still increasing because the management decisions suffer from the shifting baseline syndrome. For sustainable management, a holistic, ecohydrology-based approach is needed. It must involve all stakeholders and integrates hydrotechnical, biophysical and social approaches over the whole watershed including Magnetic Island, and all coastal waters. Several such solutions are proposed. These solutions may be applicable to all Queensland ports facing the Great Barrier Reef, as they all suffer from similar issues to various degrees.

汤斯维尔海岸和大堡礁海洋公园的沿海水域生态系统严重退化。除了其他几个症状外，它还包括一个大型水坝，它捕获了河沙，土地开垦，大规模疏浚，在沿海水域倾倒40万立方米/年的未固结泥浆，严重的海岸侵蚀，沙滩变成泥泞，健康的珊瑚礁变成珊瑚碎石，自20世纪60年代以来，水域的清晰度下降了87%，从2016年到2022年，儒艮数量减少了80%。研究表明，这种退化主要是人类在陆地和海洋上的活动造成的。气候变化发生得较晚，可能会影响未来的泥沙运输。由于管理决策受到基线转移综合症的影响，这种退化仍在增加。为了实现可持续管理，需要一种全面的、基于生态水文的方法。它必须涉及所有利益相关者，并将整个流域（包括磁岛和所有沿海水域）的水文技术、生物物理和社会方法结合起来。提出了几种这样的解决办法。这些解决方案可能适用于所有面对大堡礁的昆士兰港口，因为它们都不同程度地面临着类似的问题。

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引用次数: 0

Overlap evidence in fish microhabitat use in low-order rivers affected by small hydropower plants 受小型水电站影响的低阶河流鱼类微生境利用的重叠证据

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100683

Renan Leite , Isabel Boavida , Maria J. Costa , Francisco Godinho , Antonio N. Pinheiro , José Maria Santos

Understanding fish habitat requirements is essential for freshwater conservation, especially in ecosystems affected by hydropower production. Hydropower-driven hydropeaking can disrupt habitat dynamics by altering flow regimes, affecting fish mobility and microhabitat use. This study examined microhabitat overlap in fish populations in two Iberian small rivers, Avelames and Couto (River Douro basin, NE Portugal), affected by small hydropower plants (SHPP; Bragado and Covas). Fish sampling was conducted using modified point electrofishing techniques at reference (upstream) and disturbed (downstream) sites relative to each SHPP during two sampling seasons with hydropeaking (early and late summer). Target species included the leuciscids Northern straight-mouth nase (Pseudochondrostoma duriense), Northern Iberian chub (Squalius carolitertii), calandino (Squalius alburnoides), and the salmonid brown trout (Salmo trutta). Seasonal and spatial interspecific microhabitat overlap was assessed through Schoener’s index. At disturbed sites, cover and depth played a key role in fish microhabitat use. Fish tended to concentrate in shallower, covered habitats. Microhabitat overlap was significantly higher at disturbed sites, with no overlap at reference sites in early summer. Spatial overlap was predominantly observed among dominant leuciscid species, including nase, chub, and calandino. Seasonal variation was less evident at disturbed sites. These findings show that habitat overlap was more pronounced in hydropeaking-affected sites, where seasonal variations in microhabitat use were reduced. This suggests hydropeaking disrupts natural habitat selection, likely limiting fish's ability to adjust to seasonal changes based on ecological requirements. Such alterations may intensify interspecific interactions and constrain species' access to suitable environments, highlighting the need for strategies to mitigate hydropeaking effects.

了解鱼类栖息地需求对淡水资源保护至关重要，特别是在受水电生产影响的生态系统中。水力驱动的水力调峰可以通过改变水流状态，影响鱼类的流动性和微栖息地的利用来破坏栖息地的动态。本研究调查了受小型水电站（SHPP； Bragado和Covas）影响的两条伊比利亚小河，Avelames和Couto（葡萄牙东北部的Douro河流域）的鱼类微生境重叠。在两个有水峰的采样季节（夏初和夏末），在相对于每个SHPP的参考（上游）和干扰（下游）地点，采用改进的点电捕鱼技术进行鱼类取样。目标物种包括北直口鼻鱼（Pseudochondrostoma duriense）、北伊比利亚丘鱼（Squalius carolitertii）、卡兰提诺鱼（Squalius alburnoides）和鲑科褐鳟（Salmo trutta）。利用Schoener’s指数评价种间微生境的季节重叠和空间重叠。在受干扰的地点，覆盖和深度对鱼类微生境的利用起关键作用。鱼倾向于集中在较浅、有盖的栖息地。初夏，受干扰样地的微生境重叠显著增加，参考样地无重叠。优势种间的空间重叠主要存在于nase、chub和calandino。受干扰地点的季节变化不太明显。这些发现表明，在受水峰影响的地点，生境重叠更为明显，微生境利用的季节性变化减少。这表明，水峰值破坏了自然栖息地的选择，可能限制了鱼类根据生态需求适应季节变化的能力。这种变化可能会加强种间的相互作用，限制物种进入合适的环境，强调需要采取策略来减轻水峰效应。

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引用次数: 0