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New Benthic Fossils from the Late Ediacaran Strata of Southwestern China 被引量:2
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作者 LIU Junping LI Ming +5 位作者 TANG Feng ZHAO Jiangtai SONG Sicun ZHOU Ying SONG Xiaohan REN Liudong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第2期311-323,共13页
The Jiangchuan Biota from the Jiucheng Member(Mb.)of the Dengying Formation(Fm.),discovered in Jiangchuan,eastern Yunnan,China,is marked by copious macrofossils at the apex of the Ediacaran strata.This fauna features ... The Jiangchuan Biota from the Jiucheng Member(Mb.)of the Dengying Formation(Fm.),discovered in Jiangchuan,eastern Yunnan,China,is marked by copious macrofossils at the apex of the Ediacaran strata.This fauna features benthic algae with varied holdfasts and other fossils of indeterminate taxonomic affinity and is compositionally unique compared to the Shibantan and Gaojiashan biotas of the Dengying Fm.and the Miaohe and Wenghui biotas of the Doushantuo Fm.,elsewhere in China.One novel benthic saccular macroalgal fossil,named here Houjiashania yuxiensis gen.and sp.nov.,from the Jiangchuan Biota is based on fossils that are sausage-shaped,elongate,tubular,ranging from 0.3 to 4 cm in length,and up to 0.8 cm in diameter.One terminus is blunt and rounded to an obtuse angle,the other is bent with a spread-out surface resembling a holdfast,suggesting a three-dimensional thallus.Thin,stipe-shaped outgrowths,likely vestiges of sessile saccular life forms,are prevalent in macroalgal fossils of analogous size and shape,as well as present brown algae Scytosiphonaceae,such as Colpomenia and Dactylosiphon.The new findings augment the diversity of benthic algae,such as those known from the Early Neoproterozoic Longfengshan Biota in North China.The benthic algal macrofossils in the Jiucheng Mb.add to knowledge of Late Ediacaran metaphyte diversification and offer more clues about the evolutionary positioning of primitive macroalgae.The co-occurrence of numerous planktonic and benthic multicellular algae and planktonic microbes might have facilitated ecologically the more extensive later Cambrian explosion evidenced by the Chengjiang Biota in Yunnan. 展开更多
关键词 paleophytology benthic saccular algae algal evolution NEOPROTEROZOIC Jiucheng Member Jiangchuan Biota Yunnan Province
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Inventory and Distribution of Benthic Macroinvertebrates, Indicators of Water Quality in Four Forested Watercourses in Centre Region of Cameroon
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作者 Eric B. Biram à Ngon Sylvie B. Chinche +9 位作者 Josephine Ndjama Jean Dzavi Donald L. Nyame Mbia Mathias Nwaha Serge R. Gwos Nhiomock Blaise R. Mboye Ivone L. Tchaouapi Ulrich Tchouta Chamberline Ngalamou Samuel Foto Menbohan 《Open Journal of Ecology》 2024年第4期381-394,共14页
The inventory of benthic macroinvertebrate species was carried out in some streams of the Mefou catchment area, from August 2021 to August 2022, in order to determine the biological groups that make up the population ... The inventory of benthic macroinvertebrate species was carried out in some streams of the Mefou catchment area, from August 2021 to August 2022, in order to determine the biological groups that make up the population and characterise these environments. The dataset acquired during this study made it possible to update the existing database and contribute to the knowledge of the biological groups associated in these environments, and to provide additional information on the existing ones in relation to bioindication. Overall 80 families were identified and, on the basis of frequencies of occurrence greater than 75%, 22 families were retained as potential biological indicators. The remarkable diversity of insects and the low abundance of Diptera reflect the low degradation of environments and the good quality of water. The high diversity indices obtained reflect the maintenance of the favourable ecological conditions that favours the development of a balanced and, integrated biological community capable of adapting to changes. 展开更多
关键词 benthic Macroinvertebrates BIOINDICATORS Biological Quality Forest Watercourse Cameroon
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Impact of Dewatering on the Spatio-Temporal Distribution of Benthic Macroinvertebrate Communities in the Okpara River, Benin
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作者 Sylvain Tayéwo Biaou Fadéby Modeste Gouissi +4 位作者 Armelle Sabine Yélignan Hounkpatin Zoulkanerou Orou Piami Wakili Bolatito Yessoufou Souradjou Orou Goura Nonvignon Martial Fassinou 《Journal of Geoscience and Environment Protection》 2024年第2期30-43,共14页
Surface watercourses are areas of very high ecological and heritage value. Macroinvertebrates are bioindicators of the health of aquatic ecosystems. The aim of this study was to assess the effects of dewatering and re... Surface watercourses are areas of very high ecological and heritage value. Macroinvertebrates are bioindicators of the health of aquatic ecosystems. The aim of this study was to assess the effects of dewatering and re-watering cycles on benthic macroinvertebrate (BMI) communities. Two data collections were carried out at two stations (Okpara 1 and Okpara 2) on the Okpara river before and after dewatering. Thus, 8 samples of benthic macroinvertebrates and 12 physico-chemical parameters (T°C, pH, Transparency, Depth, Conductivity, Dissolved Oxygen that were measured in situ, and BOD5, COD, NH<sub>4</sub><sup>+</sup>, NO<sub>3</sub><sup>-</sup>, NO<sub>2</sub><sup>-</sup> and PO<sub>4</sub><sup>3-</sup>) were assayed in the laboratory. Canonical Correspondence Analysis (CCA) was used to match physico-chemical data to MIB families. Shannon and Piélou diversity indices were used to determine the effects of dewatering on MIBs. The increase in temperature values of pH, BOD5, COD, NH4</sub>+</sup>, NO3</sub>-</sup>, NO2</sub>-</sup> and PO4</sub>3-</sup>, after re-watering indicates the effect of dewatering on the quality of Okpara aquatic ecosystems. The benthic macrofauna collected consisted of 62.42% insects, 0.65% crustaceans, 6.48% molluscs, 0.72% worms and 0.14% arachnids. Whereas after re-watering, 21.67% insects, 0% crustaceans, 0.22% molluscs, 7.56% worms and 0.29% arachnids were recorded. Insects, crustaceans and molluscs were more abundant before dewatering than after. This was revealed by low abundances and taxonomic richness, as well as low Shannon index values of samples collected after re-watering. 展开更多
关键词 DEWATERING benthic Macroinvertebrates IMPACT Physico-Chemical Parameters Okpara Rivers Nord-Benin
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Phosphorus speciation,transformation and benthic processes with implications for environmental impacts in the aquaculture area of Rushan Bay
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作者 Yao Feng Jun Liu +4 位作者 Aijun Zhang Yibin Wang Lu Wang Zongqing Lv Xiangbin Ran 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第8期99-112,共14页
Phosphorus(P)is an essential nutrient for many organisms in the ocean,which plays a central role in the stability of ecosystems and the evolution of the environment.The distribution,occurrence and source-sink process ... Phosphorus(P)is an essential nutrient for many organisms in the ocean,which plays a central role in the stability of ecosystems and the evolution of the environment.The distribution,occurrence and source-sink process of P in offshore waters are highly influenced by mariculture activities.P transformation in water-sediment system is the key process in P cycling,however,the mechanism is poorly documented in the coastal sea which is influenced by human activities.Based on the comprehensive surveys in the adjacent waters outside Rushan Bay in May,July and August 2014 and February 2015,the form and transformation of P in the suspended particulate matter(SPM)and surface sediment were analyzed.The results showed that contents of total P,authigenic P and organic P of SPM increased with the increase in distance from the shoreline off Rushan Bay,and the detrital-P decreased.The partition coefficient of P between water and SPM was related to the chemical activity of different forms of P,and a higher reactivity of inorganic P associated with SPM was observed.Hypoxia induced by mariculture changes the distribution and morphological composition of P in SPM and sediment in this typical aquaculture area,which can result in a conversion of sink to source of P in the sediment,thereby having a significant impact on the regional nutrient budget and associated with eutrophication. 展开更多
关键词 phosphorus speciation TRANSFORMATION benthic process AQUACULTURE Rushan Bay
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Environmental heterogeneity and productivity drive the assemblage of benthic diatom:a case study of the Three Gorges Reservoir
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作者 Songqi YANG Tian OUYANG +4 位作者 Shaojun XU Lu ZHAO Lulu JI Junqiong SHI Zhongxing WU 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2023年第3期991-1006,共16页
Dam construction has a critical effect on river ecosystems in the world,resulting in a rapid decline in biodiversity and ecosystem health.However,the effect of dam construction on the assemblage pattern of benthic dia... Dam construction has a critical effect on river ecosystems in the world,resulting in a rapid decline in biodiversity and ecosystem health.However,the effect of dam construction on the assemblage pattern of benthic diatoms remains unclear.The benthic diatoms assemblages in the tributary backwater area of the Three Gorges Reservoir(TGR)were investigated under low water level(LWL)and high water level(HWL)conditions.Results show that Discostella stelligera,Nitzschia palea,and Craticula subminuscula were dominant species in LWL,while Achnanthidium minutissimum and Nitzschia dissipata were dominant in HWL.Furthermore,environmental variables,productivity parameters,diversity indices,and community similarity were found significantly different between LWL and HWL periods.The Mantel test indicated that both environmental and spatial factors had significant effects on diatom communities in backwater area,while productivity was also a key driving force in LWL.The variation partitioning analysis(VPA)further demonstrated that environment factors could explain the largest variance of diatom assemblages in HWL(9%)and LWL(11%),followed by spatial factors.The relative importance of productivity to diatom community was significantly enhanced in LWL,but only a slight effect was found in HWL.These results indicate that the diatom assemblages were shaped by both environmental filtering and spatial factors.The relative importance of spatial factors depended on the degree of productivity.Therefore,the homogenization of diatom communities due to environmental disturbance,e.g.eutrophication and dam building,is the underlying mechanism in assembling the benthic diatoms. 展开更多
关键词 Three Gorges Reservoir benthic diatom ASSEMBLAGE environmental heterogeneity PRODUCTIVITY
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Benthic Macroinvertebrates of Bull Run Creek: A Pre-Restoration Baseline
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作者 Joe Corsini John Zakrajsek Robert Hassmiller 《Natural Resources》 2023年第6期79-91,共13页
In North America, disturbed riparian zones have had a deleterious effect on the life cycles of anadromous fish, especially the commercially and culturally important salmon and steelhead. The result has been a signific... In North America, disturbed riparian zones have had a deleterious effect on the life cycles of anadromous fish, especially the commercially and culturally important salmon and steelhead. The result has been a significant reduction in the numbers and average size of these fish. Tributaries of the John Day River are important spawning waters for western populations of these fish, and the National Forest Service and the Confederated Tribes of the Umatilla Indian Reservation are cooperating to restore floodplains and riparian zones in a number of these headwater tributaries. Herein we have conducted a pre-restoration study of macroinvertebrates and basic water quality parameters in one of these important spawning locations in central Oregon, Bull Run Creek. Results of the turbidity, pH, dissolved Oxygen, and temperature determinations indicate that overall water quality is good, and benthic macroinvertebrate sampling yielded a number of sensitive organisms, including members of Chloroperlidae, Peltoperlidae, Ryachophilidae, Odontoceridae, and Brachycentridae. At all sites, chironomid larvae (non-biting midge) dominated the assemblages. The EPT Index suggests that Bull Run Creek ranges from fair to excellent in terms of its ability to support sensitive species. Sorensen’s Similarity Coefficient indicates varying degrees of shared diversity between the sites, and Shannon’s entropy calculations suggest moderate to low species diversity at all sites, including the reference site on nearby Boundary Creek. Overall, this study indicates that Bull Run Creek is in fair condition and that it should benefit significantly from the restoration efforts. 展开更多
关键词 benthic Macroinvertebrates RESTORATION Diversity Anadromous Fish BEAVER
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夏季长江口邻近海域活体底栖有孔虫优势种群及分布特征研究
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作者 张晓洁 肖柳 +4 位作者 郭肖伊 南海明 张涵 王飞飞 许博超 《中国海洋大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第8期74-82,共9页
针对长江口及其邻近海域活体底栖有孔虫相关研究较为缺乏的问题,本研究对2016年7月长江口海域33个站位的表层沉积物进行了活体底栖有孔虫属种的鉴定和分析。发现研究海域活体底栖有孔虫共23属31种,丰度范围为0~21 ind./g,简单分异度范围... 针对长江口及其邻近海域活体底栖有孔虫相关研究较为缺乏的问题,本研究对2016年7月长江口海域33个站位的表层沉积物进行了活体底栖有孔虫属种的鉴定和分析。发现研究海域活体底栖有孔虫共23属31种,丰度范围为0~21 ind./g,简单分异度范围为0~16种。优势种群为优美花朵虫(Florilus decorus)、杰克逊小九字虫(Nonionella jacksonensis)、亚易变筛九字虫(Cribrononion subincertum)、耳状脓泡虫(Cancris auriculus)、日本半泽虫(Hanzawaia nipponica)、条纹判草虫(Brizalina striatula)、亚洲沙壁虫(Arenoparella asiatica)、毕克卷转虫变种(Ammonia beccarii vars.)和压扁卷转虫(Ammonia compressiuscula)。活体有孔虫丰度较高的区域多集中在A3和A4断面所在海域,而在研究区域的东北部海域丰度整体较低。除长江口门以外,近岸海域具有“丰度高、属种少”的特征,而在A3和A4断面的远岸海域,则具有“丰度高、属种多”的特征。有孔虫的分布情况表明,A.beccarii vars.是研究区域内活体分布最广的种群,F.decorus是活体占比最高的种群,同时也是除A.beccarii vars.以外分布最广的种群。C.subincertum的丰度随离岸距离的增大而迅速减小,是典型的近岸优势种。 展开更多
关键词 活体底栖有孔虫 长江口 优势种群 丰度 简单分异度
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砂质海岸底栖硅藻的研究进展
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作者 陈敏 黄国彪 +2 位作者 戚洪帅 刘璇 许亚 《生态科学》 CSCD 北大核心 2024年第2期246-252,共7页
文章综述了国内外关于砂质海岸底栖硅藻的研究进展。作为砂质海岸主要的植物群,底栖硅藻通过一系列机制以适应多变的沙生环境。在潮间带的沉积物中,底栖硅藻是初级生产力和沙滩食物网的重要组成部分。沉积物、温度、盐度、光照、营养盐... 文章综述了国内外关于砂质海岸底栖硅藻的研究进展。作为砂质海岸主要的植物群,底栖硅藻通过一系列机制以适应多变的沙生环境。在潮间带的沉积物中,底栖硅藻是初级生产力和沙滩食物网的重要组成部分。沉积物、温度、盐度、光照、营养盐和生物因素等等都会对底栖硅藻的生长和群落分布产生影响。近年来,陆续有了关于我国潮间带底栖硅藻群落分布特征的研究,但总体来说,关于沙生境底栖硅藻的研究相对较少,需要进一步的调查以完善我国的硅藻生态学研究。 展开更多
关键词 砂质海岸 底栖硅藻 潮间带
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西北江下游河流底栖动物群落健康评价
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作者 肖许沐 马卓荦 +1 位作者 蒋任飞 王赛 《环境监测管理与技术》 CSCD 北大核心 2024年第4期30-35,共6页
2020年12月在西北江下游河流设置11个采样点,调查底栖动物群落结构,应用底栖动物完整性指数(B-IBI)评价河流健康状况,并分析B-IBI值与环境因子的关系。结果表明,参照点位的B-IBI值在0.59~4.00之间,处于中等—优状态;受损点位的B-IBI值在... 2020年12月在西北江下游河流设置11个采样点,调查底栖动物群落结构,应用底栖动物完整性指数(B-IBI)评价河流健康状况,并分析B-IBI值与环境因子的关系。结果表明,参照点位的B-IBI值在0.59~4.00之间,处于中等—优状态;受损点位的B-IBI值在0~0.82之间,处于很差—良好状态,其中较差和很差状态占比为87.5%。氨氮浓度与B-IBI值呈现极显著的负相关性,降低水污染负荷是促进底栖动物群落恢复健康的有效途径。在水质已经实现好转的基础上,可通过营造河底卵石生境来促进底栖动物群落恢复,同时也应加强河岸带的修复。 展开更多
关键词 底栖动物 群落结构 底栖动物完整性指数(B-IBI) 河流健康评价 西北江下游
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基于底栖动物生物完整性指数的黄河干流生态健康评价 被引量:4
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作者 冯治远 侯易明 +3 位作者 阴琨 金小伟 韩谞 潘保柱 《湖泊科学》 EI CAS CSCD 北大核心 2024年第2期512-522,共11页
黄河为世界上最长的多沙河流,全河段水沙异质性及其生态健康的空间差异明显。本文基于黄河干流全河段44个断面春秋两季(2019年)底栖动物的系统调查数据,构建黄河底栖动物生物完整性评价体系。该体系融入指示水沙过程变化的ASPT指数及EP... 黄河为世界上最长的多沙河流,全河段水沙异质性及其生态健康的空间差异明显。本文基于黄河干流全河段44个断面春秋两季(2019年)底栖动物的系统调查数据,构建黄河底栖动物生物完整性评价体系。该体系融入指示水沙过程变化的ASPT指数及EPT分类单元个体相对丰度,且参照点与受损点得分差异显著,适用于多沙河流生态健康评价。评价结果显示:黄河干流亚健康及以上状态的断面占比为秋季(75.0%)高于春季(54.5%);自源区沿河而下,底栖动物生物完整性指数值呈下降趋势;库区断面底栖动物生物完整性指数低于临近自然河段。回归分析表明,黄河干流底栖动物生物完整性指数与盐度、总氮、城镇及农田用地占比呈显著负相关,与林地及草地占比呈显著正相关。本研究结果可为黄河生态保护与管理提供科学依据。 展开更多
关键词 黄河干流 大型底栖无脊椎动物 生物完整性 生态健康评价
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基于大型底栖动物完整性指数与综合生物指数的水生态评价 被引量:1
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作者 姚琦 黎明杰 +7 位作者 麻林 唐哲 朱熠 刘阳圆 蔡永久 燕文明 张又 李宽意 《中国环境科学》 EI CAS CSCD 北大核心 2024年第3期1476-1486,共11页
针对不同流域部分生物指数评价标准并不统一的问题,利用熵权法构建综合生物指数(CBI)统一模糊评价标准,同时计算底栖动物完整性指数进行评价结果验证.以2021年秋季和2022年春季东洞庭湖10个监测点的数据为基础,通过对25个候选参数逐步筛... 针对不同流域部分生物指数评价标准并不统一的问题,利用熵权法构建综合生物指数(CBI)统一模糊评价标准,同时计算底栖动物完整性指数进行评价结果验证.以2021年秋季和2022年春季东洞庭湖10个监测点的数据为基础,通过对25个候选参数逐步筛选,选出M3(软体动物分类单元数)、M9(耐污类群相对丰度)、M13(BI指数)和M22(Shannon-Wiener指数)4个秋季核心参数以及M6(摇蚊个体相对丰度)、M13、M16(BPI指数)和M24(Margalef指数)4个春季核心参数,采用比值法统一量纲后累加计算底栖动物完整性指数,再对BPI、FBI、Shannon-Wiener、BMWP指数客观定权后计算CBI指数划分出5个状态进行对比,结果表明:B-IBI指数和CBI指数均得出靠近出湖河道点位较为健康,湖体点位多为一般和较差,整体秋季健康状况略好于春季,六门闸附近为极差状态,可能是因为该区域是东洞庭湖的闸口之一,常年关闭导致水体流动性较差,开闸放水后沉积物中的淤泥会释放污染物使得湖区总氮超标,进而影响了大型底栖动物的完整性.CBI指数与B-IBI指数以及COD_(Mn)、TLI(∑)指数等相关分析结果良好,表明利用综合生物指数和底栖动物完整性指数结合能为东洞庭湖的水生态健康评价提供参考. 展开更多
关键词 大型底栖动物 生物完整性指数 熵权法 水生态健康 东洞庭湖
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无定河流域不同水土流失区底栖动物生物完整性指数构建与健康评价 被引量:1
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作者 侯湘然 潘保柱 +3 位作者 侯易明 胡恩 贺瑶 冯治远 《湖泊科学》 EI CAS CSCD 北大核心 2024年第1期274-285,I0026-I0037,共24页
无定河流域位于黄土高原与毛乌素沙地过渡带,水土流失严重,生态环境具有脆弱性和波动性。于2021年春季(4月)和秋季(10月)对无定河流域上、中、下游及其6条支流和流域内的3个淤地坝开展水生态系统调查,旨在厘清无定河流域底栖动物群落特... 无定河流域位于黄土高原与毛乌素沙地过渡带,水土流失严重,生态环境具有脆弱性和波动性。于2021年春季(4月)和秋季(10月)对无定河流域上、中、下游及其6条支流和流域内的3个淤地坝开展水生态系统调查,旨在厘清无定河流域底栖动物群落特征,构建底栖动物生物完整性指数并开展健康评价。无定河流域春季共采集到底栖动物105种,平均密度为181 ind./m^(2),平均生物量为0.760 g/m^(2),秋季共采集到底栖动物67种,平均密度为94 ind./m^(2),平均生物量为0.454 g/m^(2)。通过对两季度研究区域内底栖动物27个生物参数开展分布范围检验、判别能力分析和相关性分析,构建无定河流域底栖动物生物完整性指数,对全流域40个样点(6个参照点和34个受损点)进行B-IBI健康评价。评价结果表明,总体上无定河流域底栖动物生物完整性较好,40个样点中春季有19个处于健康或亚健康状态,秋季有23个处于健康或亚健康状态,其中无定河上、中游干支流大都以健康和亚健康为主,无定河下游干支流以及3个淤地坝水体健康状况较差。在不同水土流失类型区域,底栖动物群落特征和生物完整性评价具有显著性差异。本研究结果可为无定河流域河流健康评估提供科学依据。 展开更多
关键词 无定河流域 水土流失 底栖动物完整性指数 大型底栖无脊椎动物 健康评价
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南水北调西线工程上线水源区大型底栖动物群落结构及环境驱动因子 被引量:4
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作者 张丰搏 胡鹏 +3 位作者 闫龙 唐家璇 闫肖瑶 王玉莲 《水资源保护》 EI CSCD 北大核心 2024年第1期135-141,共7页
为评估南水北调西线工程上线水源区大型底栖动物群落结构及环境驱动因子,于2022年7月(汛期)和11月(非汛期)开展监测采样工作。采用生物多样性指数和丰度-生物量比较曲线(ABC曲线)作为大型底栖动物群落特征参数,分析大型底栖动物群落在... 为评估南水北调西线工程上线水源区大型底栖动物群落结构及环境驱动因子,于2022年7月(汛期)和11月(非汛期)开展监测采样工作。采用生物多样性指数和丰度-生物量比较曲线(ABC曲线)作为大型底栖动物群落特征参数,分析大型底栖动物群落在水源区的结构,并对其进行多元排序和Pearson相关性分析。结果表明:共采集45种大型底栖动物,隶属于4门5纲10目32科44属,其中优势种8种,所有优势物种出现频率均大于50%,水源区大型底栖动物群落结构一致性较高;水源区Margalef丰富度指数、Shannon-Wiener多样性指数和Pielou均匀度指数均值分别为4.01、1.68、0.61;多数采样区域大型底栖动物的ABC曲线呈纠缠态势,其丰度和生物量累积百分比的差值面积在0附近波动,群落以小个头物种为主;优势种以耐污值低的敏感种类为主,说明河流几乎不受污染,水体清洁;pH值是影响水源区大型底栖动物群落结构的主要环境驱动因子。 展开更多
关键词 南水北调西线工程 大型底栖动物群落 生物多样性指数 ABC曲线 环境驱动因子
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The Community Structure of Benthic Macroinvertebrates Associated with Spartina alterniflora in the Yangtze Estuary, in China 被引量:7
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作者 谢志发 章飞军 +1 位作者 刘文亮 陆健健 《Zoological Research》 CAS CSCD 北大核心 2007年第2期167-171,共5页
Benthic macroinvertebrate communities in Spartina alterniflora zones in the Yangtze Estuary, in China, were investigated seasonally in 2005, and their structure and biodiversity were analyzed. Twenty-one species were ... Benthic macroinvertebrate communities in Spartina alterniflora zones in the Yangtze Estuary, in China, were investigated seasonally in 2005, and their structure and biodiversity were analyzed. Twenty-one species were identified, across four Classes; 10 species of Crustacea, five species of Polychaeta, five species of Gastropoda, and one species of Lamellibranchia. Dominant species included: Assiminea sp., Notomastus latericeus, Cerithidea largillierl, Gtauconome chinensi and Gammaridae sp. Functional groups were comprised of a phytophagous group and a detritivorous group. The average density of all benthic macroinvertebrates was 650.5 ±719.2 inds/m^2 in the survey area. The high value of the standard deviation of the average density was a result of abundant Assiminea sp. at Beihu tidal flats. The average density of macroinvertebrates from Beihu tidal flat, Chongming Dongtan to Jinshanwei tidal flat decreased gradually. There was significant difference between compositions and abundance of macroinvertebrates along the estuary gradient (P 〈 0.05). The density and biodiversity were highest in summer and lowest in winter. The mean biomass of macroinvertebrates was 20.8 ± 6.1 g/m^2. Biomass changed seasonally in the same way as density, with the change in biomass being: summer (Aug.) 〉autumn (Oct.) 〉spring (Apr.) 〉 winter (Dec.). A BIO-ENV analysis showed that the mean grain size of sediment, height of Spartina and salinity were the ma- jor factors which affected the structure of the macroinvertebrate community. Variations in the community structure were probably caused by the population dynamics of S. alterniflora along with the variation in sampling time and location. 展开更多
关键词 benthic macroinvertebrate Spartina alterniflora Yangtze Estuary Community structure
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辽宁省大型底栖无脊椎动物耐污值修订研究
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作者 姜永伟 王业耀 +6 位作者 袁俊斌 张峥 李杨 李曌 丁页 金小伟 徐昨非 《中国环境监测》 CAS CSCD 北大核心 2024年第5期154-164,共11页
收集整理了2011—2021年辽宁省47个点位的水质理化监测数据和大型底栖无脊椎动物定量监测数据,水质理化监测数据27368个,大型底栖无脊椎动物样本总量632个,定量监测数据3180个。合计监测到大型底栖无脊椎动物4门9纲23目85科188属297种,... 收集整理了2011—2021年辽宁省47个点位的水质理化监测数据和大型底栖无脊椎动物定量监测数据,水质理化监测数据27368个,大型底栖无脊椎动物样本总量632个,定量监测数据3180个。合计监测到大型底栖无脊椎动物4门9纲23目85科188属297种,以水生昆虫为主(226种),占总种类数的76.1%;其次为软体动物、环节动物和甲壳动物,分别占12.5%、7.1%和4.0%;扁形动物仅1种,占0.3%。采用累积百分位数法、直接引用法和专家经验法,修订了辽宁省85科188属(合计273个)大型底栖无脊椎动物耐污值。其中,通过计算法得到耐污值135个,直接引用其他地区已建立的耐污值100个,根据专家经验确定耐污值38个。采用参照点位和受损点位的BI箱线图法对该研究和以往辽宁省建立的大型底栖无脊椎动物耐污值数据进行判别能力分析,结果表明,通过计算法确定的耐污值能更好地反映不同环境梯度,其适应性好于仅仅通过专家经验法确定的耐污值。 展开更多
关键词 大型底栖无脊椎动物 修订 耐污值 BI
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Bioturbation Effects of Benthic Fish on Soil Microorganism of Paddy Field 被引量:5
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作者 胡勇军 孙刚 +1 位作者 房岩 韩国军 《Agricultural Science & Technology》 CAS 2010年第4期172-175,共4页
[Objective]The research aimed to explore the bioturbation effects of benthic fish Misgurnus anguillicaudatus on soil microorganism(microflora,biomass,and special physiological groups) of paddy field.[Method]The expe... [Objective]The research aimed to explore the bioturbation effects of benthic fish Misgurnus anguillicaudatus on soil microorganism(microflora,biomass,and special physiological groups) of paddy field.[Method]The experiments were conducted locally and quantitatively in field,using plate count and MPN methods.[Result]In the microflora of paddy soil tested,the quantity of bacteria is the largest,followed by actinomycetes and fungus.Compared with the control paddy fields,in rice-fish paddy fields the quantities of bacteria,actinomycetes and fungus were higher,at significance level P 〈0.05,P 〈0.01,and P 〈0.01 respectively.The microbial biomass C and N in rice-fish paddy fields is remarkably higher than those in control paddy fields,both at significance level P 〈0.01;the microbial biomass P in rice-fish paddy fields is higher than that in control paddy fields,but at significance level P 〈0.05.Benthic fish promotes the growth of soil azotobacter,cellulolytic bacteria,nitrobacteria,sulfur bacteria,and ammonifying bacteria,restricts the reproduction of nitrate reducing bacteria and sulfate reducing bacteria.[Conclusion]The benthic fish had important effects on microflora,microbial biomass,and special microorganism physiological groups of paddy soil,improves the living conditions of soil microorganisms,promotes the soil fertility and bio-chemical activity,which is beneficial for improving the supply ability of soil nutrients such as N,P,S,as well as the efficiency of nutrient utilization. 展开更多
关键词 benthic fish Soil microorganism Paddy field Integrated ecosystem BIOTURBATION
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基于环境DNA评价鸭绿江口底栖生态质量状况
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作者 王桂营 李宏俊 +3 位作者 邵魁双 刘滨玮 楚奇 叶金清 《海洋学报》 CAS CSCD 北大核心 2024年第3期75-88,共14页
为研究环境DNA鉴定底栖生物评价生态质量状况的应用潜力,本研究采集17份鸭绿江口底栖生物样品,分别利用环境DNA与形态学进行鉴定,并对所得生态质量评价指数(AMBI、BENTIX、香浓-维纳H'、M-AMBI)进行比较分析。结果显示:环境DNA鉴定... 为研究环境DNA鉴定底栖生物评价生态质量状况的应用潜力,本研究采集17份鸭绿江口底栖生物样品,分别利用环境DNA与形态学进行鉴定,并对所得生态质量评价指数(AMBI、BENTIX、香浓-维纳H'、M-AMBI)进行比较分析。结果显示:环境DNA鉴定生物隶属于10纲16目19科20属22种,形态学鉴定生物隶属于9纲27目43科55属57种,共有生物10种;两种鉴定方法得出的AMBI指数间(R=0.428,p=0.043,y=0.32x+1.08)、BENTIX指数间(R=0.430,p=0.043,y=0.28x+3.59)存在显著一致性,而香浓-维纳H'指数间存在显著差异性;两种鉴定方法得出的AMBI等级间、M-AMBI等级间相似性较高,分别为51.02%、44.90%;两种鉴定方法得出的AMBI与M-AMBI等级更符合实际情况,且评价鸭绿江口整体生态质量状况为良。本研究表明,基于环境DNA鉴定底栖生物评价生态质量状况,在海洋环境监测调查中具有较高的应用潜力。 展开更多
关键词 环境DNA 底栖生物 生态质量
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底栖扰动对城市河流沉积物CO_(2)和CH_(4)释放的影响
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作者 史思捷 黎鸿莉 +6 位作者 姚婧梅 韩乐 谭秋君 刘亚丽 韦冰 于雪松 王程成 《中国环境科学》 EI CAS CSCD 北大核心 2024年第4期1885-1893,共9页
以具有不同扰动功能的黄色羽摇蚊幼虫(Chironomus flaviplumus)、苏氏尾鳃蚓(Branchiura sowerbyi)和椭圆萝卜螺(Radix swinhoei)为对象,通过微宇宙实验探究不同底栖动物扰动效应下的沉积物界面理化因子演变特性以及对温室气体CO_(2)和CH... 以具有不同扰动功能的黄色羽摇蚊幼虫(Chironomus flaviplumus)、苏氏尾鳃蚓(Branchiura sowerbyi)和椭圆萝卜螺(Radix swinhoei)为对象,通过微宇宙实验探究不同底栖动物扰动效应下的沉积物界面理化因子演变特性以及对温室气体CO_(2)和CH_(4)释放的影响规律.结果表明,不同扰动类型的底栖动物对沉积物-水界面的溶氧(DO)特征带来差异化改变,并影响了有机质的好氧/厌氧分解和碳素转化,进而改变了CO_(2)和CH_(4)的产生及释放量:1)3种底栖动物对CO_(2)和CH_(4)释放的影响存在差异:苏氏尾鳃蚓对两种温室气体的释放呈现最强的促进作用(为对照组的1.59和1.64倍),椭圆萝卜螺对两种温室气体释放的影响不显著,而摇蚊幼虫一定程度上抑制了CH_(4)释放.2)尾鳃蚓扰动下更多的碳素被消耗(表层沉积物和上覆水的TC含量减少)并生成CO_(2)和CH_(4)从系统逸出,其最低的DO渗透深度也为有机物厌氧分解产生CH_(4)创造了更有利的条件;萝卜螺仅在沉积物表面活动,对DO渗透深度以及系统TC和TOC改变较小,进而对温室气体释放的影响也最弱;摇蚊幼虫对CH_(4)释放的抑制作用可能是由于其扰动增大了DO渗透深度,抑制了有机物厌氧分解. 展开更多
关键词 底栖动物 扰动功能群 河流沉积物 温室气体 影响
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大亚湾湿地底栖微藻对氮素的吸收存储及影响因素探究
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作者 赵春宇 王岩 +2 位作者 黄小平 唐艳 刘富刚 《海洋通报》 CAS CSCD 北大核心 2024年第2期240-247,共8页
为探讨不同类型湿地表层沉积物中底栖微藻对氮素的吸收存储能力及其影响因素,于2017年3月(枯水期)和8月(丰水期)分别采集大亚湾光滩湿地(T1)、河口湿地(T2)和红树林湿地(T3)表层沉积物底栖微藻样品,并进行了反复冻融实验。研究结果表明... 为探讨不同类型湿地表层沉积物中底栖微藻对氮素的吸收存储能力及其影响因素,于2017年3月(枯水期)和8月(丰水期)分别采集大亚湾光滩湿地(T1)、河口湿地(T2)和红树林湿地(T3)表层沉积物底栖微藻样品,并进行了反复冻融实验。研究结果表明,大亚湾滨海湿地表层沉积物中的底栖微藻丰度具有显著的时空差异,温度、营养盐和沉积物粒径可能是影响底栖微藻生长繁殖的主要因素。不同季节比较发现,底栖微藻的氮累积存储能力表现为枯水期强于丰水期,主要由于丰水期较高温度和强光照引起的过度干燥和光刺激,限制了底栖微藻的生长繁殖。河口湿地丰富的营养物质能促进底栖微藻的生长繁殖,致使在淡澳河河口湿地叶绿素含量最高,底栖微藻丰度也最大。底栖微藻胞内溶解无机氮(DIN)含量表现为T2(河口湿地)>T1(光滩湿地)>T3(红树林湿地)的空间分布特征,这与其生物量的时空分布特征相一致(P<0.01),并且底栖微藻对氨氮(NH_(4)-N)有较强的累积存储能力,胞内氨氮(IC-NH_(4))占胞内无机氮(IC-DIN)高达90.4%。底栖微藻IC-DIN占整个沉积物氮库的24.2%,其中约20.0%的NH_(4)-N、17.6%的NO_(3)-N和16.0%的NO_(2)-N被吸收累积在底栖微藻细胞内。整体上,大亚湾湿地沉积物底栖微藻的氮素累积能力受营养负荷的影响,且NH_(4)-N负荷越高,底栖微藻对氮的吸收存储能力越强,能有效降低近岸富营养化水平。 展开更多
关键词 底栖微藻 氮存储 影响因素 滨海湿地
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鄱阳湖湿地大型底栖无脊椎动物多样性对群落次级生产力及稳定性的影响
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作者 夏迎 阳文静 +3 位作者 钟洁 张琍 刘丹丹 游清徽 《生态学报》 CAS CSCD 北大核心 2024年第8期3337-3347,共11页
理解生物多样性对生态系统功能及稳定性的影响对于制定有效的保护管理策略有重要意义。然而,目前生物多样性与群落生产力、稳定性的关系仍存在争议。在鄱阳湖湿地布设30个采样点,于2019年秋季开展大型底栖无脊椎动物群落野外调查。基于... 理解生物多样性对生态系统功能及稳定性的影响对于制定有效的保护管理策略有重要意义。然而,目前生物多样性与群落生产力、稳定性的关系仍存在争议。在鄱阳湖湿地布设30个采样点,于2019年秋季开展大型底栖无脊椎动物群落野外调查。基于底栖动物群落数据,采用广义加性模型分析物种、谱系、功能多样性对鄱阳湖湿地底栖动物群落次级生产力与稳定性的影响。结果表明:底栖动物群落的次级生产力与反映物种多样性的指数(Simpson多样性指数、Shannon⁃Wiener多样性指数、Pielou均匀度指数)、分类多样性指数、平均分类差异指数、功能丰富度指数等呈显著的负相关,其中Pielou均匀度指数与次级生产力的相关度最高(r^(2)=0.33)。功能多样性对群落次级生产力的空间分异有最高的解释度(r^(2)=0.75)。P/B值(次级生产力与生物量之比代表群落稳定性)与物种、谱系、功能多样性指数均呈正相关,其中功能丰富度与P/B值的相关度最高(r^(2)=0.22)。反映物种多样性的三个指数总体上对P/B值的空间分异解释度最高(r^(2)=0.37)。谱系多样性与次级生产力、P/B值的相关性相对较弱。生物多样性指数总体分别解释了次级生产力和群落稳定性中81.9%、54.8%的变异。上述研究结果表明,生物多样性与群落生产力、稳定性的关系可能因具体的生物群落而异。研究结果对于鄱阳湖湿地的底栖生物多样性保护有参考价值。 展开更多
关键词 大型底栖无脊椎动物 生物多样性指数 次级生产力 群落稳定性 鄱阳湖
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