The resource status and spatiotemporal patterns of necton community in Taiwan strait

本文根据2006-2007年在台湾海峡进行的四个航次的定点底拖网调查的资料，比较分析了台湾海峡游泳生物的种类组成和数量分布特征及其季节变化；通过分析数量生物量曲线（ABC曲线）和多样性指数特征，探讨了该海域游泳生物资源状况及多样性特点，并用多元分析（聚类分析、非度量的多维尺度、单因子相似性分析和相似性百分比分析）的方法分析游泳生物群聚空间格局特征及环境因素对群落结构的影响。 本次调查共渔获游泳生物种类373种，其中鱼类273种，甲壳类81种，头足类19种。在273种鱼类中，暖水性种最多，有214种，占总数的78.4%；暖温性种次之，有58种，占21.2%；冷温性种仅有一种。根据鱼类栖息水层的...Based on the data from bottom trawl necton resource survey with four cruises (2006-2007) in Taiwan strait, the species composition, biomass and density distribution and seasonal variation were described. The resource status of necton in this area and biodiversity characteristic were analyzed by abundance biomass comparison curve (ABC curve) and diversity index, and the spatio-temporal patterns of ...学位：理学硕士院系专业：海洋与环境学院环境科学与工程系_环境科学学号：2262006115234

Nekton species composition and biodiversity in Taiwan Strait

根据2006-2007年在台湾海峡进行的四个季度航次定点底拖网调查资料,分析了台湾海峡游泳动物的种类组成、数量分布、优势种和多样性等特征。结果表明,调查海域共鉴定出游泳动物373种,其中鱼类273种,甲壳类81种,头足类19种;渔获物组成以鱼类为主,占渔获物总重量的65.6%,其次为甲壳类和头足类,分别占21.1%和13.3%,所有调查站位游泳动物的年平均生物量密度指数为24.91kg/H,主要优势种类为带鱼(TrICHIuruS JAPOnI-CuS)、拥剑梭子蟹(POrTunuS HAAnII)、二长棘鲷(PArArgyrOPS EdITA)、龙头鱼(HArPAdOn nEHErEuS)、竹筴鱼(TrACHuruS JAPOnICuS)、火枪乌贼(lOlIgO bEkA)等。对多样性的分析显示,台湾海峡游泳动物物种多样性指数(H′)变化范围为1.45-3.21,平均为2.47,其中秋季最高,夏季最低,且呈现南高北低的特点。与历史资料相比,目前台湾海峡游泳动物种类数明显减少,尤其是闽东和闽南—台湾浅滩海域表现最为突出;优势种类个体呈现小型化和低龄化趋势,表明台湾海峡游泳动物资源衰退明显。Based on four bottom trawl surveys(2006-2007) in the Taiwan Strait,nekton species composition,biomass and density distribution,dominant species,and community characteristics were analyzed.We re-corded 373 nektonic species including 273 fish species,81 crustaceans and 19 cephalopods.The mean bio-mass density index of the study area was estimated to be 24.91 kg/h with fish species,crustacean species and cephalopod species accounting for 65.6%,21.1% and 13.3% of the total,respectively.Dominant species in-cluded Trichiurus japonicus,Portunus haanii,Parargyrops edita,Harpadon nehereus,Trachurus japonicus and Loligo beka.Shannon-Wiener diversity indices(H') ranged from 1.45 to 3.21,with an average of 2.47 and were higher in autumn and winter than in spring and summer.Compared with historical data,nekton resources are obviously declining,with species richness decreasing especially in the Minnan-Taiwan Bank area.Domi-nant species also exhibited a preponderance of smaller size and age classes compared to historical data.国家海洋专项资助项目(908-02-01-02;908-02-04-01);国家海洋局第三海洋研究所基本科研业务费专项资金资助项目(海三科2010016

白令海鱼类分类多样性及鱼类区系研究

根据FishBase、Global Species等数据库中的鱼类物种资料,结合中国第四次北极科学考察在白令海的鱼类调查数据,运用分类多样性方法分析了白令海鱼类的分类多样性水平及其区系特征。结果表明:数据库记录白令海鱼类359种,中国第四次北极科学考察在白令海捕获鱼类31种;白令海与阿拉斯加湾鱼类相似性系数最高;白令海鱼类分类阶元包含指数(TINCLi)分别为目级阶元(2.90、8.86、16.48)、科级阶元(3.05、5.67)、属级阶元(1.80),平均分类差异指数△~+为62.7,分类差异变异指数∧~+为185.0;白令海鱼类组成可以分为3个区系。随着全球气候变化导致白令海海域的冷水团北移和海水表面温度上升,部分鱼类持续性北移可能是白令海的鱼类物种组成结构改变的主要原因。国家自然科学基金项目(41876176);;南北极环境综合考察与评估专项(CHINARE2012 2016);;国家海洋局第三海洋研究所基本科研业务费专项(海三科2016011;2018010)资助~

Fauna composition of necton and fishery resources in waters near Dayushan Island

2006年1月--10月福建闽东大嵛山附近海域游泳动物调查研究结果表明,该海域的游泳动物有97种,其中鱼类51种(软骨鱼1种,硬骨鱼类50种),隶属于9目24科42属;甲壳类42种,隶属于2目15科20属;头足类4种,隶属于3目3科3属.暖水性种类为33种,占鱼类总种数的64.7%;暖温性鱼类18种,占鱼类总种数的35.3%,未出现冷温性和冷水性鱼类.种类数的季节变化依次呈夏季>冬季>秋季>春季.生物量的季节变化,依次呈夏季>秋季>春季>冬季;而生物量尾数的季节变化,依次呈夏季>春季>秋季>冬季.平均单位网次渔获生物量和密度分别为9.53kg/H和1 319 Ind/H.生物量优势种和密度优势种分别为大黄鱼和中华管鞭虾.扫海面积法估算年平均现存资源量为57 370 Ind/kM2和404.51kg/kM2.同时,本文对该海域游泳生物的资源结构现状与历史调查数据作了对比分析,并讨论了多样性结构与生物量的季节性变化规律.结果表明,该海域渔业资源有严重衰退的现象,多样性结构与生物量的季节性变化并不具有必然的一致性.A necton investigation was conducted in January and October,2006.It is recorded there were 97 species nekton,among them 51 species were fishes(1 species of chondrichthian fishes,50 species of osteichthian fishes) belonging to 9 orders,24 families and 42 genus.Besides,there were 42 species of crustacean and 4 species of cephalopoda recorded.33 species of warm-water fishes accounting for 64.7% of the total fish,18 species of warm-temperate fishes accounting for 35.3% of the total.There was not any cold-temperate fish recored.The seasonal variations of species in number follows the order of summer>winter>autumn>spring.The seasonal variations of biomass in weight follows the order of summer>autumn>spring>winter.The seasonal variations of density follows the order of summer>spring>autumn>winter.The mean biomass and density were 9.53kg/h·net and 1 319ind/h·net.The dominant species for biomass and density were Pseudosciaena crocea and Solenocera crassicomis.The density and biomass for fishery resource were estimated to be 57 370 ind/h and 404.51 kg/h.At last,the species composition and diversity for the necton were discussed.国家908专项资助项目(908-02-01-02908-02-04-01

97MeV~(16)O+~(51)V反应中α粒子与类弹产物的关联测量

测量了α粒子与类弹产物的关联,得到的α粒子符合能谱呈现出类弹、类靶相继发射的特征;α粒子与类弹产物~(12)C的关联表明了弹核破裂(break-up)机制的存在.在类弹产物探测方向附近,观察到核的阴影效应

97MeV~(16)O轰击~(51)V靶出射α粒子的测量与理论分析

用不同种类的粒子望远镜测量了97MeV~(16)O+~(51)V反应中出射的α粒子.得到了单举α粒子能谱、角分布、E-θ平面内的d~2θ/dEDΩ截面等高图及速度平面内的d~2θ/PCdEdΩ截面等高图.区分了复合核蒸发的α粒子与直接机制发射的α粒子.用激子模型对预平衡发射的α粒子贡献进行估计,得到的预平衡发射和复合核蒸发分别在α粒子总产额中所占的比份

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^