南沙群岛多毛类背褶沙蚕属一新种          下载免费PDF全文

沈寿彭  吴宝铃 《海洋与湖沼》1993,24(6):641-644

于１９８８年，中国科学院南海海洋研究所在南沙群岛进行综合考察，在采集到的多毛类标本中，发现了背褶沙蚕Ｔａｍｂａｌａｇａｍｉａ的一新种，其与代表种背褶沙蚕Ｔ．ｆａｕｖｅｌｉ和东方背褶沙蚕Ｔ．ｏｒｉｅｎｔａｌｉｓ在眼、双背须出现的刚节数以及背须的形状等有明显的区别，故定名为中华背褶沙蚕Ｔａｍｂａｌａｇａｍｉａ ｓｉｎｉｃａ，模式标本保存于中国科学院南海海洋研究所。  相似文献   

The role of sediments in the phosphorus cycle in Lake Lugano. II. Seasonal and spatial variability of microbiological processes at the sediment-water interface   总被引：1，自引：1，他引：0  

Maja A. Lazzaretti  Kurt W. Hanselmann  Helmut Brandl  Daniel Span  Reinhard Bachofen 《Aquatic Sciences - Research Across Boundaries》1992,54(3-4):285-299

P, Fe, Mn, and S species were analyzed in water samples from the sediment-water interface collected at four seasonally different times during the course of a year at two sampling sites in the southern basin of Lake Lugano (Lago di Lugano). The results reveal the strong influence of the biogeochemical processes in the sediment on the chemical composition of the lake water above. Consumption of oxygen and nitrate under oxic to microoxic conditions in the water column as well as sequential release of reduced manganese and iron under anoxic conditions was observed as a direct or indirect consequence of microbially mediated degradation of organic matter. The seasonal pattern observed for the release and the retainment of dissolved reduced iron and manganese correlates well with the one for dissolved phosphate. Iron, manganese and phosphorus cycling are coupled tightly in these sediments. Both sediment types act as sinks for hydrogen sulfide and sulfate. An inner-sedimentary sulfur cycle is proposed to couple iron, manganese and phosphorus cycling with the degradation of organic matter. Nutrient cycling at the sediment-water interface might thus be driven by a microbially regulated electron pumping mechanism. The results contribute to a better understanding of the role of sediment processes in the lake's internal phosphorus cycle and its seasonal dynamics.  相似文献   

Intensive sampling of iodine and nutrient speciation in naturally eutrophicated anchialine pond (Rogoznica Lake) during spring and summer seasons     

Vesna Žic  Marina Carić  Eric Viollier  Irena Ciglenečki 《Estuarine, Coastal and Shelf Science》2010

A study of inorganic iodine speciation in the water column of a naturally eutrophicated anchialine pond (Rogoznica Lake, East Adriatic Coast) was conducted in a period between April and July 2004 to obtain information how close the inorganic iodine system is to that of inorganic nutrients during spring, when phytoplankton activity is at maximum, and how the system changes up to summer, when highly reducible redox-conditions prevail in deep water.  相似文献   

春季珠江口水域鱼卵和仔稚鱼的分布及其与环境因子的关系   总被引：4，自引：0，他引：4  

肖瑜璋  王蓉  欧强  方宏达 《台湾海峡》2010,29(4):488-495

根据2004~2007年春季珠江口水域10个站位的鱼卵和仔稚鱼调查资料,着重就鱼卵和仔稚鱼的数量分布和年际变化及其与环境因子的相关关系进行研究.结果表明：其鱼卵和仔稚鱼隶属于9目33科58种（类）,以鲈形目种类数所占比例最高（为53.4%）,其次为鲱形目（为20.7%）.鱼卵和仔稚鱼大致分成半咸水性、近岸性和近海性3个生态类群.鱼卵和仔稚鱼优势种类共9种,其中鱼卵优势种为6种,仔稚鱼的也为6种.青洲附近水域是春季鱼卵和仔稚鱼的最主要分布区域之一.鱼卵和仔稚鱼数量的年际变化明显,鱼卵和仔稚鱼个体数量的最大值均出现在2006年.水温、pH值和溶解氧含量是影响鱼卵个体数量的较显著因子,盐度和溶解氧含量为影响仔稚鱼个体数量的较显著因子.盐度、pH值及溶解氧、悬浮物、叶绿素a含量对鱼卵和仔稚鱼种类数均有不同程度的影响.  相似文献   

西北太平洋围线海绵科(海绵动物门:六放海绵纲:双盘海绵目)一新种   总被引：2，自引：1，他引：1  

龚琳  李新正 《海洋学报(英文版)》2018,37(10):175-179

本文记录了西太平洋深海围线海绵科1新种——扭形白须海绵。该海绵共含2个标本，其中1个采集于雅浦海山932米处，另1个采集于卡罗琳海山775.3米处。该新种含有椭圆形大双盘骨针、3种类型的双盘骨针、棒状骨针和节杖骨针，使其很容易与该属下的现有8种区分开。该种为西北太平洋报道的第4种白须海绵属的种。  相似文献   

浙江沿岸海域虾类优势种空间生态位分析   总被引：5，自引：2，他引：3  

卢占晖  周永东  朱文斌  徐开达 《海洋学报》2018,40(2):77-86

生态位与种间竞争、资源利用密切联系，体现了物种在群落中利用资源的能力。为探明浙江沿岸海域虾类分布格局的形成和影响因素，通过相对重要性指数确定了虾类群落优势种，分别采用Levins公式和Pianka指数计测了虾类优势种生态位宽度和生态位重叠，并通过典范对应分析（CCA）研究生态位分化情况。结果表明:研究海域共出现13种虾类优势种，根据生态位宽度大小将研究海域内的虾类优势种分为3类，细巧仿对虾、细螯虾、鲜明鼓虾和中华管鞭虾属于第一类群，以上4种虾类的空间生态位宽度较宽；日本鼓虾、哈氏仿对虾、鹰爪虾、中国毛虾和葛氏长臂虾属于第二类群，这5种虾类空间生态位略低于第一类群，但其生态位仍相对较宽；戴氏赤虾、脊腹褐虾、东海红虾和大管鞭虾这4种虾类的空间生态位较窄，属第三类群；生态位重叠指数变化范围在0.00~0.78，将重叠指数按照大于0.6、0.3~0.6和小于0.3划分为重叠度较高、重叠度较低和重叠度低3个重叠度等级，结果表明，虾类优势种生态位重叠以较低和低2个等级为主；虾类分布受水深、底层溶解氧和底层盐度的影响较大，受水温影响较小。虾类群落优势种空间生态位与生活习性、种间竞争、摄食以及海洋环境因子等多种因素有关。  相似文献   

西太平洋及其边缘海的浮游动物系统分类、物种多样性及新物种-中国海洋生物分类专著的简要编目   总被引：1，自引：1，他引：0  

王雨  黄宗国  王春光  黄将修  刘镇胜  许振祖  黄加祺  陈瑞祥  连光山  戴燕玉  林景宏  林茂 《海洋学报(英文版)》2018,37(10):229-242

生物多样性的研究和保护首先从认识物种开始，并需要内容全面的的基础资料，这很大程度上依赖于通过现场调查和文献研习所获得的物种编目和分布图集研究成果。由于分类学人才储备不足，重要标本的收集和鉴定变得越来越困难。西太平洋是全球海洋生物种源中心，许多海洋生物类群的最高物种多样性都出现于该区域。本文在西太平洋及其边缘海（105-152°E，0–45°N）701个测站获取的6203份浮游动物样品分类鉴定基础之上，对1965-2008年该区浮游动物主要类群的系统分类、物种多样性和新物种新纪录进行了汇编和总结。本文共记录和编入西太平洋及其边缘海10个浮游动物类群206科686属2657种（含亚种）。包括水螅水母类99科251属697种，栉水母类12科22属59种，浮游软体动物14科36属85种，介形类8科91属416种，桡足类51科156属908种，糠虾类4科60属202种，磷虾类2科8属56种，十足类8科23属105种，毛颚类5科13属48种，被囊类5科26属81种。文中详细列举了10大类群的主要优势种，并记述了筒螅水母科2新种以及棒状水母科1新属2新种。许多赤道热带海、高纬度寒带海、深海深层的浮游动物物种在我国首次记录，较以往我国所记录的1852种增加了806种，增录43.5%，包括赤道热带种增录1.4%，高纬度冷水种增录3.5%，深海深水种增录3.2%。作者还对中国海洋浮游动物研究的5个主要领域进行了展望。本文的定性系统分类信息对海洋浮游动物多样性和生物地理学研究具有重要意义，特别是对2008年以后中国海洋生物种类全面系统总结的专著而言。  相似文献   

辽东湾西海岸潮间带大型底栖动物群落生态位特征   总被引：3，自引：0，他引：3  

李轶平  李玉龙  付杰  于旭光  邹存杰 《海洋科学》2019,43(3):32-39

基于2014年9月和2015年4月辽东湾西海岸潮间带10个断面3个潮区的调查数据,对12个优势种的生活型、生态位宽度和生态位重叠度进行了分析,结果表明:12个优势种分别隶属于3门4纲12科;面上生活类群和面下生活类群的比值GS/GSB表现为春季秋季;秀丽织纹螺、日本大眼蟹和丽核螺的生态位宽度较宽(2.171、2.170和2.169),猫爪牡蛎和短角双眼钩虾的生态位宽度较窄(0.637和0.173);生态位重叠较为显著的种类有四组,均是生态位宽度较宽的物种。以上结果也从一个侧面反映了底栖生物对季节和生境的适应情况,由于季节变化和生境不同,使物种生态位宽度值发生了变化,从而影响物种之间的生态位重叠值。  相似文献   

鲁西苍峄铁矿带构造控矿特征浅析          下载免费PDF全文

甘延景  杜显彪  朱宁  唐秀花  王学仁 《山东国土资源》2018,34(4)

鲁西苍峄铁矿带是山东省典型的"鞍山式"铁矿带之一,区内先后发现和评价了多个大中型铁矿床,但对成矿带控矿因素缺乏系统的研究。该文通过对重点矿床的剖析,阐述了区内断裂构造和褶皱构造对铁矿层的控制规律,研究表明:区内构造形式主要表现为一系列复式向斜和复式背斜,具有相间出现、平行产出的特征,对区内铁矿层的展布起控制作用。  相似文献   

Movement patterns of an endemic South African sparid,the black musselcracker Cymatoceps nasutus,determined using mark-recapture methods     

TS Murray  PD Cowley  BQ Mann  JQ Maggs  G Gouws 《African Journal of Marine Science》2019,41(1):71-81

This study made use of data from three long-term fish tagging projects along the South African coastline to investigate the movement behaviour of the endemic black musselcracker Cymatoceps nasutus (Sparidae). From 1984 to 2016, a total of 3 430 C. nasutus (178–980 mm fork length) were tagged (with small plastic dart tags) throughout the species’ distributional range, with an overall reported recapture rate of 7.2%. Recaptured individuals displayed high levels of residency, moving an average of 14.8 km, with time-at-liberty ranging from 0 to 6 809 days. The majority of recaptures (84.6%) were made within 1 km of the tagging sites; however, some large-scale movements, of up to 528 km, were recorded. Although C. nasutus individuals moving greater distances were characterised by greater mean sizes (mm fork length) at time of recapture, the distances moved by juveniles were not significantly different from those of adults (p > 0.05). Low levels of connectivity among coastal regions were therefore expected due to the high degree of residency displayed by this species. Combining traditional management approaches together with a well-designed network of no-take marine protected areas is likely to be the most effective way to protect this vulnerable species. A lack of data on the movements of adults remains a challenge, but this could be overcome by tracking large individuals tagged with long-life acoustic transmitters.  相似文献