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The impact of Ethiopian Green Legacy Initiative (GLI) on landscape functionality and plant species diversity in Lake Hawassa watershed, Ethiopia 埃塞俄比亚绿色遗产倡议(GLI)对埃塞俄比亚哈瓦萨湖流域景观功能和植物物种多样性的影响
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-27 DOI: 10.1002/eco.2676
Bezawit A. Demisse, Saa Dittoh, Eliasu Salifu, Michael M. Moges, Mulugeta Dadi Belete

As one of the responses to the global commitments against climate change, the Ethiopian Government launched a nationwide Green Legacy Initiative (GLI) in 2019, which largely focused on forest tree plantations with some inclusion of fruit trees. Despite its tremendous efforts and investments, its effectiveness and impacts have not been studied. This paper attempted to address this necessity by conducting a cross-sectional quasi-experiment in three randomly selected woredas/districts of Lake Hawassa Watershed from August 20 to September 2, 2023. The research hypothesized the likely impacts of GLI on four dependent variables (hydrological regulation, soil stability, nutrient cycling and plant species diversity). To achieve this, the research considered the two variants of GLI practices (plantation with and without soil and water conservation measures) and the corresponding control sites. Having three sites and three treatments with five replications, the study involved a total of forty-five quadrats of the same size (20 m × 20 m). The first three parameters were analysed using the landscape functionality analysis method, while the fourth employed Shannon's diversity index. Results of ANOVA showed that, on average 87% of randomly selected quadrats were found to significantly improve the local hydrology (runoff potential) (≈ 83.3% with Av. p = 0.012), soil stability (≈100% with Av. p = 0.002), nutrient cycling (≈83.3% with Av. p = 0.017) and plant species diversity (≈83.3% with Av. p = 0.012). The research revealed positive results from the Ethiopian Green Legacy Initiative. The small number of samples is acknowledged as a limitation of the research.

作为对全球应对气候变化承诺的回应之一,埃塞俄比亚政府于 2019 年在全国范围内启动了 "绿色遗产倡议"(GLI),该倡议主要侧重于林木种植,也包括一些果树。尽管埃塞俄比亚政府做出了巨大努力和投资,但尚未对其成效和影响进行研究。本文试图解决这一问题,于 2023 年 8 月 20 日至 9 月 2 日在哈瓦萨湖流域随机选取的三个县/区进行了横断面准实验。研究假设了 GLI 对四个因变量(水文调节、土壤稳定性、养分循环和植物物种多样性)可能产生的影响。为此,研究考虑了两种不同的 GLI 实践(有水土保持措施和无水土保持措施的种植)以及相应的对照地点。研究涉及三个地点、三种处理方法和五次重复,共有 45 个相同大小(20 m × 20 m)的四分格。前三个参数采用景观功能分析法进行分析,第四个参数采用香农多样性指数进行分析。方差分析结果表明,平均 87% 的随机选取的四分地显著改善了当地的水文(径流潜力)(≈ 83.3%,平均值 p = 0.012)、土壤稳定性(≈100%,平均值 p = 0.002)、养分循环(≈83.3%,平均值 p = 0.017)和植物物种多样性(≈83.3%,平均值 p = 0.012)。研究显示,埃塞俄比亚绿色遗产倡议取得了积极成果。样本数量少被认为是研究的局限性。
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引用次数: 0
Enhancing ecological success in Yangtze River channel construction: A numerical modelling approach 提高长江航道建设的生态成功率:数值模拟方法
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-24 DOI: 10.1002/eco.2664
Pengcheng Li, Yike Li, Yang Yang, Qianqian Wang, Weiwei Yao

Channel constructions significantly impact river hydrodynamics, subsequently influencing river ecosystems. To mitigate the negative influence of channel construction and protect fish habitat, it is essential to evaluate fish habitat suitability through the integration of hydrodynamic and habitat models. This study models channel constructions on both the left and right riverbanks to evaluate habitat suitability for Four Major Chinese Carps and the Chinese sturgeon. Initially, flow velocity, water depth and grain size are simulated, followed by an assessment of habitat conditions using the Habitat Suitability Index (HSI) for three distinct construction strategies. Results reveal that constructing channels on the left bank mitigates adverse effects on fish habitat, while constructions on the right bank and both riverbanks lead to habitat degradation. Long-term effects on riverbed elevation and fish habitat suitability post-construction were also investigated. Notably, the Four Major Chinese Carps consistently demonstrate greater suitability for the studied river, regardless of flow rate or construction strategies, in comparison to the Chinese sturgeon. These findings underscore diverse responses to channel construction, providing valuable insights for identifying critical habitat areas for endemic fish conservation. This research presents a robust framework for assessing fish ecology in river systems, offering support for conservation decision-makers.

河道建设会对河流水动力产生重大影响,进而影响河流生态系统。为了减轻河道建设的负面影响并保护鱼类栖息地,必须通过整合水动力和栖息地模型来评估鱼类栖息地的适宜性。本研究建立了左右岸河道建设模型,以评估四大家鱼和中华鲟的栖息地适宜性。首先模拟了流速、水深和颗粒大小,然后使用栖息地适宜性指数(HSI)评估了三种不同建设策略的栖息地条件。结果显示,在左岸修建河道可减轻对鱼类栖息地的不利影响,而在右岸和两岸修建河道则会导致栖息地退化。此外,还研究了施工后对河床高程和鱼类栖息地适宜性的长期影响。值得注意的是,与中华鲟相比,无论流速或施工策略如何,中华四大家鱼始终对研究河流表现出更高的适宜性。这些发现强调了对河道建设的不同反应,为确定保护特有鱼类的关键栖息地区域提供了宝贵的见解。这项研究为评估河流系统中的鱼类生态提供了一个强有力的框架,为保护决策者提供了支持。
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引用次数: 0
Rainfall partitioning characteristics by two sand-binding shrubs and their impact on shallow soil moisture replenishment in the Northwestern desert steppe of China 中国西北荒漠草原两种固沙灌木的降雨分区特征及其对浅层土壤水分补充的影响
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-22 DOI: 10.1002/eco.2652
Xiaoying Chen, Lin Chen, Xinguo Yang, Minlan Li, Dian Yu, Naiping Song

Rainfall partitioning by the vegetation canopy into stemflow (SF) and throughfall (TF) plays a crucial role in soil infiltration and the local water balance. This study aims to quantify the differences in SF and TF between two sand-binding shrubs, Caragana liouana and Salix psammophila, in the desert steppe, clarify the effects of biotic and abiotic factors on them using the boosted regression trees (BRT) model, and compare soil moisture replenishment during the growing seasons of 2021 and 2022. Under identical rainfall conditions, the canopies of C. liouana and S. psammophila can lead to differences in rainfall partitioning. The SF percentage ranged from 0 to 23.70% for C. liouana and from 0% to 3.3% for S. psammophila, respectively, while the TF percentage ranged from 42.12% to 90.07% for C. liouana and from 52.39% to 94.87% for S. psammophila. The funnelling ratio for C. liouana (69.59) is 1.19 times higher than for S. psammophila (58.36). Rainfall amount is the primary variable affecting rainfall partitioning. The average soil moisture replenishment and soil moisture conversion efficiency under the C. liouana canopy are 11.02 mm and 58.39%, respectively, which are significantly higher than those for S. psammophila (4.84 mm and 24.33%, respectively). These findings suggest that C. liouana, with its relatively higher SF and soil moisture conversion capability compared to S. psammophila, plays a significant ecohydrological role in water-limited ecosystems. This study provides a reference for species selection and ecological management in vegetation restoration efforts in desert steppes and similar regions.

植被冠层将降雨分为茎流(SF)和直流(TF),这对土壤入渗和当地的水分平衡起着至关重要的作用。本研究旨在量化荒漠草原上两种固沙灌木--柳叶沙柳(Caragana liouana)和沙柳(Salix psammophila)--的茎流和直流(TF)差异,利用提升回归树(BRT)模型阐明生物和非生物因素对它们的影响,并比较2021年和2022年生长季节的土壤水分补充情况。在降雨条件相同的情况下,柳穿鱼和红柳的树冠会导致降雨分配的差异。柳叶菜的 SF 百分比从 0% 到 23.70% 不等,红叶石楠的 SF 百分比从 0% 到 3.3% 不等,而柳叶菜的 TF 百分比从 42.12% 到 90.07% 不等,红叶石楠的 TF 百分比从 52.39% 到 94.87% 不等。C. liouana 的漏斗比率(69.59)是 S. psammophila(58.36)的 1.19 倍。降雨量是影响降雨分配的主要变量。六叶莲冠层下的平均土壤水分补充量和土壤水分转化效率分别为 11.02 毫米和 58.39%,显著高于红铃马尾松(分别为 4.84 毫米和 24.33%)。这些研究结果表明,柳叶菜的SF和土壤水分转化能力相对高于红柳,在限水生态系统中发挥着重要的生态水文作用。这项研究为荒漠草原及类似地区植被恢复工作中的物种选择和生态管理提供了参考。
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引用次数: 0
Impacts of two high-head dams on macroinvertebrate communities in the regulated river reaches of Wujiang River, China 两座高水头大坝对中国乌江调节河段大型无脊椎动物群落的影响
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-22 DOI: 10.1002/eco.2659
Shiyun Chi, Juxiang Hu, Xianfu Zhao, Jun Hu, Sixin Li, Hongjun Wang, Lianfeng Zhou, Dewang Li

The impact of two high-head dams on macroinvertebrate communities within the regulated reaches of the Wujiang River in China was explored, using longitudinal monitoring data spanning from 2006 to 2016. In this study, we set up 10 sampling sites categorized into four areas based on different stressors and defined three stages based on the timeline of dam construction. Our findings revealed significant changes in community composition before and after dam impoundment. While certain original dominant taxa, such as Rivularia globosa and Lithoglyphopsis ovatus, remained dominant throughout the stages, mayflies and caddisflies nearly vanished in the downstream reaches of the dams. This trend was accompanied by the disappearance of taxa with low adaptability and the emergence of tolerant taxa downstream of the dams. Additionally, typical limnological taxa colonized the inundated reaches. Dam impoundment affected not only macroinvertebrate community composition but also diversity. In this study, the recovery effect of communities downstream of dams was not observed due to the limited distance, but the presence of Wujiangdu Dam upstream of the two dams for over 20 years makes us believe that in a large river system, macroinvertebrate communities downstream of high-head dams may fully recover if the distance from the dams is long enough. The original and vulnerable species R. globosa, which demonstrated remarkable adaptability and thrived downstream of dams, should be further studied in the future.

本研究利用 2006 年至 2016 年的纵向监测数据,探讨了两座高水头大坝对中国乌江调节河段内大型无脊椎动物群落的影响。在这项研究中,我们设置了 10 个采样点,根据不同的压力因素将其分为四个区域,并根据大坝建设的时间表定义了三个阶段。我们的研究结果表明,大坝蓄水前后群落组成发生了重大变化。虽然某些原有的优势类群,如球花蜉蝣(Rivularia globosa)和卵形蜉蝣(Lithoglyphopsis ovatus),在各个阶段仍占优势,但在大坝下游,蜉蝣和笛鲷几乎消失。伴随着这一趋势的是适应性低的类群的消失和大坝下游耐受性强的类群的出现。此外,典型的湖沼学类群也在被淹没的河段定居。大坝蓄水不仅影响了大型无脊椎动物群落的组成,也影响了其多样性。在本研究中,由于距离有限,没有观察到大坝下游群落的恢复效果,但两座大坝上游的乌江渡大坝存在了 20 多年,这使我们相信,在大型河流系统中,如果与高水头大坝的距离足够长,高水头大坝下游的大型无脊椎动物群落可能会完全恢复。对于在大坝下游表现出极强适应性并繁衍生息的原始脆弱物种 R. globosa,今后应进行进一步研究。
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引用次数: 0
A review of carbon and phosphorus ratios in fresh water ecosystems dominated by phytoplankton: Effects of climate and geography 以浮游植物为主的淡水生态系统中的碳磷比例综述:气候和地理的影响
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-22 DOI: 10.1002/eco.2666
Gohar Ayub, Jinzhu Su, Yuping Su, Luwei Zheng, Yuanyuan Zhou, Sami ur Rehman, Muhammad Zahir

In freshwater systems, carbon, nitrogen, and phosphorus are essential macroelements. Changing ecological communities as a result of anthropogenic activity and climate change has become a global issue. C:P has been demonstrated to be a trustworthy and sensitive assay for detecting and monitoring single or multiple species in a wide range of samples. We look at how C:P can be utilized to manage and reduce eutrophication and harmful algal blooms (HABs) in freshwater environments in this review work. Recent research show how C:P has been shown to be a useful strategy for gathering complete data in freshwater ecosystem studies. The total number of papers in ScienceDirect from 2000 to 2023 with the terms “carbon and phosphorus ratios, fresh water ecosystems, and phytoplankton” in the title, abstract, or keywords was acquired for this review. Based on the number of published research demonstrating an increased understanding of the basic scientific concepts behind the carbon and phosphorus ratio, the overall temporal trend in publications on the ratio showed a steady growth. Compared to eutrophic Lake Victoria, which had a C:P of 149, mesotrophic Lakes Malawi and Kivu had a ratio of 263. Applying the carbon-to-phosphorus ratio to lake and reservoir eutrophication assessment is feasible, and the increasing C:P ratio serves as a prime indicator for the initiation of lake and reservoir reoligotrophication. Our findings establish the framework for future study into the relationship between organic nutrients and eutrophication, as well as the ecological ramifications of these relationships in freshwater systems. Furthermore, our prediction was that increases in C:P would change the structure of phytoplankton communities.

在淡水系统中,碳、氮和磷是必不可少的宏量元素。人类活动和气候变化导致的生态群落变化已成为一个全球性问题。C:P 已被证明是一种可靠、灵敏的检测方法,可用于检测和监测各种样本中的单个或多个物种。在本综述中,我们将探讨如何利用 C:P 来管理和减少淡水环境中的富营养化和有害藻华 (HAB)。最新研究表明,C:P 是淡水生态系统研究中收集完整数据的有用策略。本综述收集了 2000 年至 2023 年科学导刊(ScienceDirect)中标题、摘要或关键词中包含 "碳磷比、淡水生态系统和浮游植物 "的论文总数。从发表的研究论文数量来看,人们对碳磷比背后的基本科学概念有了更多的了解,有关碳磷比的论文数量总体上呈稳步增长的时间趋势。富营养化的维多利亚湖的碳磷比为 149,而中营养湖马拉维湖和基伍湖的碳磷比为 263。在湖泊和水库富营养化评估中应用碳磷比是可行的,碳磷比的增加是湖泊和水库开始再富氧的主要指标。我们的研究结果为今后研究有机养分与富营养化之间的关系以及这些关系在淡水系统中的生态影响建立了框架。此外,我们预测 C:P 的增加将改变浮游植物群落的结构。
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引用次数: 0
Advancements and trends in ecological models for lake ecosystems: A bibliometric analysis (2002–2022) 湖泊生态系统生态模型的进展与趋势:文献计量分析(2002-2022 年)
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-21 DOI: 10.1002/eco.2655
Wei Li, Jianjian Wang, Cheng Chen, Jiang Xia, Yong Niu, Zhiguo Yu, Shan Qu, Junjie Jia

Ecological models hold significant potential for advancing lake research. In this study, we employed CiteSpace, a bibliometric analysis tool, and VOSviewer, a visualisation software, to facilitate a comprehensive understanding of recent advancements in ecological modelling within the context of lake research. The objective was to furnish valuable references in support of the widespread application of ecological models in aquatic environments. Using the 4688 articles collected in the Web of Science (WoS) core database as the sample data source, conducting corresponding data mining and quantitative analysis through visualisation analysis software such as CiteSpace and VOSviewer. From the perspectives of literature output patterns, keyword co-occurrence networks and future research directions, in-depth quantitative and visual analysis is carried out on the current status of research on lake ecological models, research institutions, journal publication situations, prolific authors and research hot topics. Through meticulous examination of literature and organisational categorisation techniques, we systematically scrutinised and synthesised the present state, limitations and noteworthy considerations associated with models such as EFDC, CE-QUAL-W2, DYRESM-CAEDYM, AQUATOX, Vollenweider, PCLake, MIKE, WASP and Deflt3D in the context of lake research. Our findings reveal that research focal points from 2002 to 2022 encompass climate change, the ramifications of eutrophication on aquatic ecosystems and the effects of phytoplankton and resuspended sediments on lake management.

生态模型在推动湖泊研究方面具有巨大潜力。在这项研究中,我们采用了文献计量分析工具 CiteSpace 和可视化软件 VOSviewer,以促进全面了解湖泊研究中生态模型的最新进展。目的是提供有价值的参考文献,以支持生态模型在水生环境中的广泛应用。以科学网(WoS)核心数据库收录的 4688 篇文章为样本数据源,通过 CiteSpace 和 VOSviewer 等可视化分析软件进行相应的数据挖掘和定量分析。从文献产出模式、关键词共现网络和未来研究方向等角度,对湖泊生态模型的研究现状、研究机构、期刊发表情况、多产作者和研究热点等进行了深入的定量和可视化分析。通过细致的文献检索和组织分类技术,我们系统地梳理和归纳了湖泊研究中 EFDC、CE-QUAL-W2、DYRESM-CAEDYM、AQUATOX、Vollenweider、PCLake、MIKE、WASP 和 Deflt3D 等模型的研究现状、局限性和值得注意的问题。我们的研究结果表明,从 2002 年到 2022 年的研究重点包括气候变化、富营养化对水生生态系统的影响以及浮游植物和再悬浮沉积物对湖泊管理的影响。
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引用次数: 0
Critical linkages among floodplain hydrology, geomorphology and ecology along a lowland meandering river, Illinois, USA 美国伊利诺伊州一条低地蜿蜒河流沿岸洪泛区水文、地貌和生态之间的重要联系
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-17 DOI: 10.1002/eco.2661
Tanya Shukla, Chelsy R. Salas, Ryan C. Pankau, Bruce L. Rhoads

The ecology of forested floodplains is intricately linked to river hydrology through the frequency, magnitude, timing and duration of floodplain inundation. Spatial variability in inundation characteristics is influenced by the geomorphic template of a floodplain, both in terms of the topography of floodplain features and connectivity of these features to the main river channel. Spatial variability in inundation, in turn, has the potential to produce spatial variability in forest ecological characteristics. This study examines the influence of floodplain geomorphic features on spatial variability in inundation frequency as well as the relationship between these geomorphic features and the ecological characteristics of a floodplain forest. The frequencies of floods of different magnitudes are determined from flow-duration analysis of over 100 years of discharge data for a lowland meandering river in Illinois, USA. Data on discharge, stage, and topography are then used to calibrate a two-dimensional hydraulic model of flow across the floodplain at different levels of inundation. Integrating the frequency and inundation data yields mapping of average annual inundation frequency for different parts of the floodplain. Significant differences in inundation frequency correspond to three distinct floodplain geomorphic features: secondary channels (frequency = 12%), closed depressions (frequency = 4%) and the floodplain surface (frequency = 3%). Tree density is similar among the three types of geomorphic features, but tree species composition and canopy density differ significantly between secondary channels and the floodplain surface. The results provide insight into linkages among hydrology, geomorphology and tree characteristics of forested floodplains of lowland meandering rivers.

森林冲积平原的生态通过冲积平原淹没的频率、规模、时间和持续时间与河流水文错综复杂地联系在一起。淹没特征的空间变化受洪泛区地貌模板的影响,包括洪泛区地貌特征以及这些特征与主河道的连接性。淹没的空间变化反过来又有可能产生森林生态特征的空间变化。本研究探讨了洪泛区地貌特征对淹没频率空间变化的影响,以及这些地貌特征与洪泛区森林生态特征之间的关系。通过对美国伊利诺伊州一条低地蜿蜒河流 100 多年的排水数据进行流量-持续时间分析,确定了不同量级洪水的频率。然后,利用有关排水量、河段和地形的数据,校准在不同淹没水平下流经洪泛区的二维水力模型。综合频率和淹没数据,绘制出洪泛区不同区域的年平均淹没频率图。淹没频率的显著差异与三种不同的洪泛区地貌特征相对应:次级河道(频率 = 12%)、封闭洼地(频率 = 4%)和洪泛区地表(频率 = %)。这三类地貌特征的树木密度相似,但次级河道和洪泛平原表面的树种组成和树冠密度差异很大。研究结果有助于深入了解低地蜿蜒河流森林泛滥平原的水文、地貌和树木特征之间的联系。
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引用次数: 0
Bubbling trouble: Effects of supersaturated water on benthic macroinvertebrates 沸腾的烦恼过饱和水对底栖大型无脊椎动物的影响
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-15 DOI: 10.1002/eco.2665
Gaute Velle, Trond Einar Isaksen, Robert J. Lennox, Ulrich Pulg

The saturation of total dissolved gases (TDG) in water remains around 100%. Certain circumstances can lead to TDG values exceeding 100%, resulting in TDG supersaturation (TDGS). TDGS above about 110% can be toxic to animals that rely on water for gas exchange. However, saturation beyond 200% can occur in freshwater downstream of dams and hydroelectric power plants. Despite its impact, TDGS is often overlooked as a hazard to aquatic life, particularly for benthic macroinvertebrates. This study aimed to examine the effects of TDGS on nine species of benthic macroinvertebrates. We used replicated tank studies to manipulate TDGS levels from 100% to 120% and investigated the overall survival and species-specific effects on survival and buoyancy. We also present a summary on the effects of TDGS on invertebrate species previously tested. The results indicate that seven of nine species exhibited increased buoyancy when exposed to TDGS, causing them to float on the water surface. Additionally, a Cox Proportional Hazards model revealed a significant effect of TDGS on the survival of the macroinvertebrates. The sensitivity towards TDGS varied greatly among species of benthic macroinvertebrates, and significant species-specific effects were only observed for Isoperla grammatica, Baetis rhodani and Asellus aquaticus. Among these, the two latter species showed clear dose-related effects caused by TDGS, enabling the assessment of LT50 (time required to kill half of the tested population). B. rhodani was most sensitive with a LT50 of 3.7 days at 119% TDGS. Both species had visible air bubbles under the exoskeleton. Our findings highlight that direct and indirect effects on benthic macroinvertebrates can occur even at low to moderate levels of gas supersaturation, likely causing reduced density, decreased species diversity and altered species composition. The emerging evidence strongly supports the implementation of regulations on TDGS in freshwaters.

水中总溶解气体 (TDG) 的饱和度保持在 100% 左右。某些情况下,TDG 值会超过 100%,从而导致 TDG 过饱和(TDGS)。超过约 110% 的 TDGS 会对依靠水进行气体交换的动物产生毒性。然而,在大坝和水电站下游的淡水中,饱和度可能会超过 200%。尽管 TDGS 会对水生生物,尤其是底栖大型无脊椎动物造成危害,但人们往往忽视了它的影响。本研究旨在考察 TDGS 对九种底栖大型无脊椎动物的影响。我们使用重复的水槽研究,将 TDGS 水平控制在 100% 到 120% 之间,并调查了总体存活率以及特定物种对存活率和浮力的影响。我们还总结了 TDGS 对之前测试过的无脊椎动物物种的影响。结果表明,九种物种中有七种在接触 TDGS 后浮力增加,导致它们浮在水面上。此外,考克斯比例危害模型显示,TDGS 对大型无脊椎动物的存活率有显著影响。不同种类的底栖大型无脊椎动物对 TDGS 的敏感性差异很大,只有 Isoperla grammatica、Baetis rhodani 和 Asellus aquaticus 对特定种类有显著影响。其中,后两个物种显示出 TDGS 造成的明显剂量相关效应,从而可以评估 LT50(杀死一半受测种群所需的时间)。B. rhodani 最敏感,在 119% TDGS 的条件下,LT50 为 3.7 天。这两个物种的外骨骼下都有明显的气泡。我们的研究结果表明,即使气体过饱和度处于中低水平,也会对底栖大型无脊椎动物产生直接和间接影响,可能导致密度降低、物种多样性减少和物种组成改变。新出现的证据有力地支持了在淡水中实施 TDGS 法规。
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引用次数: 0
The assessment of water quality by macroinvertebrate and water quality indices in small reservoir (Damsa, Türkiye) 用小型水库(土耳其达姆萨)中的大型无脊椎动物和水质指数评估水质
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-14 DOI: 10.1002/eco.2658
Özlem Fındık, Seval Aras

The composition and spatial distribution of macroinvertebrates in the Damsa reservoir have been analysed. Also, reservoir water was evaluated with water quality index (WQI). Damsa reservoir is significant for both biodiversity and recreation in the region. Except for the winter season, the lake water is of good quality for WQI. There is pollution in the lake in terms of phosphorus, especially for winter. In terms of phosphate, all of the stations are mezotrophic for the OECD; however, Stations 4 and 5 are eutrophic for the Türkiye Surface Water Quality Management Regulation (the others are mezotrophic). Community variation and status of benthic macroinvertebrate were evaluated with Ecological Status Class Assessment Tools (ESCATs) indices which have been widely used in the literature. In the present study, 1062 individual benthic macroinvertebrates from 11 orders and 17 families were collected. A total of 46 macroinvertebrates taxa were identified. The first three dominant groups are Oligochaeta (42.66%), Hemiptera (Micronecta scholtzi, 23.07%) and Chironomidae (19.67%).

分析了达姆萨水库中大型无脊椎动物的组成和空间分布。此外,还用水质指数(WQI)对水库水进行了评估。达姆萨水库对该地区的生物多样性和娱乐活动都具有重要意义。除冬季外,湖水水质指数(WQI)良好。湖中存在磷污染,尤其是在冬季。就磷酸盐而言,根据经合组织(OECD)标准,所有监测站均为弱营养型;但根据土耳其地表水水质管理条例,4 号和 5 号监测站为富营养型(其他监测站均为弱营养型)。底栖大型无脊椎动物的群落变化和状态采用文献中广泛使用的生态状态等级评估工具(ESCATs)指数进行评估。本研究收集了 11 目 17 科 1062 个个体的底栖大型无脊椎动物。共鉴定出 46 个大型无脊椎动物类群。前三个主要类群分别是偶蹄目(42.66%)、半翅目(Micronecta scholtzi,23.07%)和摇蚊科(Chironomidae,19.67%)。
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引用次数: 0
Dam-induced difference of fish habitat distribution in the fluctuating backwater zone of the Three Gorges Dam 大坝引起的三峡大坝波动回水区鱼类生境分布差异
IF 2.5 3区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2024-05-02 DOI: 10.1002/eco.2657
Li Wang, Qingrong Xie, Shengfa Yang, Guanbing Xu, Wei Yang, Jiang Hu

Changes in fish habitat induced by dam construction in the downstream river have been well documented in an increasing body of literature. Fish habitats in the backwater zone of dams have undergone dramatic changes, which have still remained poorly understood. This study aims to provide a more complete understanding of fish habitat distribution and clarify fish habitat utilization patterns in the upstream dam in order to adopt effective remediation activities. This study was conducted in the Three Gorges Dam (TGD) as it is the world's largest installed capacity hydropower station, with a backwater zone length of about 660 km. Four major Chinese carp (FMCC) were selected as target fish species, and fish habitat distribution upstream of TGD was assessed by integrating the swimming ability and environmental preference of different fish species into their critical life stages. Assessment results at different life stages of the target fish species showed that June was a critical period for spawning activities FMCC in the fluctuating backwater zone of TGD. The riverbank was an important feeding habitat for FMCC, and the high-velocity flow in the centre of the channel exceeded the limits of the swimming ability of target fish. The fish habitat distribution in the fluctuating backwater zone of TGD was heavily affected by runoff from April to September and by dam operation from October to March of the next year. This work provide valuable information about river conservation and management in the upstream of TGD.

越来越多的文献详细记录了下游河流中大坝建设引起的鱼类栖息地变化。大坝背水区的鱼类栖息地发生了巨大变化,但人们对这些变化的了解仍然很少。本研究旨在更全面地了解大坝上游鱼类栖息地的分布情况,并阐明鱼类栖息地的利用模式,以便采取有效的补救活动。三峡大坝是世界上装机容量最大的水电站,回水区长约 660 公里。研究选取了四大家鱼(FMCC)作为目标鱼种,并结合不同鱼种在关键生命阶段的游动能力和环境偏好,评估了三峡大坝上游的鱼类栖息地分布。目标鱼种不同生命阶段的评估结果表明,6 月是大亚湾溯河波动区大口鲶产卵活动的关键时期,河岸是大口鲶重要的觅食栖息地。河岸是洄游鱼类重要的觅食栖息地,河道中心的高速水流超过了目标鱼类的游动能力极限。4 月至 9 月的径流和 10 月至翌年 3 月的大坝运行对天津港发展区波动回水区的鱼类栖息地分布影响很大。这项工作为大沽河上游的河流保护和管理提供了有价值的信息。
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引用次数: 0
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Ecohydrology
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