One new species and two new records of free-living marine nematodes from the Huanghai Sea   总被引：4，自引：3，他引：1  

ZHANG Zhinan  HUANG Yong 《海洋学报(英文版)》2005,24(4):91-97

1 IntroductionIn January 2003, undisturbed sediments were tak-en from a grid of 22 sampling stations (from 32.5° to37°N, 122° to 125°E) during the cruise of an ecologi-cal survey of the over-winter ground for anchovy inthe Huanghai Sea. Meiofaunal abundance varied from55.3 to 152.0 ind/cm2 [(95.4 ±27.0) ind/cm2], with81% to 93% [(83.1 ±22.7) ind/cm2] of the specimensbeing nematodes. Up to now, twenty-nine species ofmarine nematodes have been recorded from theHuanghai Sea (Zhang and P…  相似文献   

厦门潮间带泥滩和虾池小型底栖动物类群的丰度   总被引：16，自引：4，他引：12  

蔡立哲  李复雪 《台湾海峡》1998,17(1):91-95

１９９６年对厦门三处潮间带和两口虾池的小型底栖动物进行了调查。结果表明,小型底栖动物主要类群自由生活海洋线虫。此外,还有底栖桡足类、多毛类和寡毛类。三处潮间带海洋线虫的平均密度为６０．１３个／ｃｍ＾２,占小型底栖动物平均密度的９４．４６％。除了鸡屿中潮区和低潮区外,其他潮漳带海洋线虫与底栖桡足类丰度比度多在１６．３以下,表明厦大海边和大屿潮间带未受明显污染。刚放虾苗的虾池,小型底栖动物贫乏,随着时  相似文献   

Demographic history,range size and habitat preferences of the groundwater amphipod Niphargus puteanus (C.L. Koch in Panzer, 1836)     

《Limnologica》2020

Niphargus puteanus is the oldest described species of its genus and, in the past, was used as a taxonomic annotation for any subterranean amphipod record. For that reason, no clear knowledge exists about its actual range size and habitat preferences. We here applied a molecular taxonomic and phylogeographical approach based on mitochondrial and nuclear DNA to shed light on its distribution and to infer its demographic history. Furthermore, we analysed aquifer types and water flow regimes to provide a clearer picture of the species’ ecological requirements.Our results indicate that N. puteanus is widely distributed north of the Alps, having its core range in the geomorphological natural region of the ‘South German Scarplands’ (SGS). Additionally, isolated satellite populations exist in the Taunus and the Sauerland, and two single individuals were collected in Luxembourg and in Austria, respectively. The species’ maximal distribution range reaches 756 km between the two single-specimen records and 371 km within the SGS. A very high haplotype diversity was observed, revealing the presence of seven haplotype groups. All the haplogroups were present in the SGS and exhibited distinct spatial-genetic patterns. We thus inferred a high degree of population isolation, with the SGS being a potential long-term refugium for N. puteanus. Historical drift of specimens along major riverine networks (Rhine, Danube) may provide an evolutionary dispersal mechanism explaining the formation of satellite populations.From an ecological perspective, populations of N. puteanus were found to be closely associated with fast-flowing spring environments within fissured aquifers. This species should therefore be classified as both crenophile and stygophile, effectively exploiting resources of surface as well as subsurface spring waters.  相似文献   

中国东海颈栉虫属(多毛纲:双栉虫科)一新记录种     

隋吉星  李新正 《海洋学报(英文版)》2018,37(10):145-147

本文报道和描述了中国东海双栉虫科颈栉虫属一新记录种，沃氏颈栉虫。本文标本与沃氏颈栉虫的原始描述非常吻合，包括具有两对鳃，胸齿片刚节具有两对加长的腹疣足和具有12个腹部齿片刚节。本文的标本具有长的须状的鳃，可延伸到胸部第9刚节，这在原始描述中没有提及。本文首次在中国海域记录本种。  相似文献   

四种贝类和鱼类外寄生车轮虫的国内新纪录     

詹子锋  ZENG Hong  LIN Nengfeng  徐奎栋 《海洋学报(英文版)》2018,37(10):91-97

车轮虫是一类主要寄生于贝类和鱼类体表的缘毛类纤毛虫原生动物。本文对分别寄生于海洋贝类－－虾夷扇贝Mizuhopecten yessoensis，半咸水鱼类－－鲻鱼Mugil cephalus和双色鳗鲡Anguilla bicolor bicolor，以及淡水鱼类－－光唇鱼Acrossocheilus fasciatus鳃表和体表的虾夷扇贝车轮虫Trichodina pectenis，亚卓车轮虫T.jadranica，急尖车轮虫T.acuta和喙状车轮虫T.rostrata，进行了详细的分类学研究。本文第一次报道了虾夷扇贝车轮虫的活体和蛋白银染色后特征，该虫体也是国内新记录种。其它三个车轮虫物种感染的鱼类，均属新纪录宿主。同时，也报道了这四种车轮虫对宿主的感染率和感染强度。  相似文献   

浮游软体动物长角螺属(Clio)种类的分类学和谱系地理学     

高阳  李海涛  姜重臣  陈志云  李宏俊 《海洋学报》2020,42(2):96-105

许多终生浮游软体动物接近全球分布或呈环球分布,是海洋酸化和谱系地理学研究的良好材料。本文以西北太平洋和北印度洋的长角螺属(Clio)种类为材料,通过测定其线粒体COI基因(mtCOI,55条)和核18S rRNA基因(9条)序列,结合数据库中已有的序列,对该属进行了分类学和谱系地理学研究。结果表明,矛头长角螺(C. pyramidata)和尖棘长角螺(C. cuspidata)在mtCOI基因系统树中均形成4个明显分化的谱系分支,分别为支系A–D和支系E–H。矛头长角螺的支系A为全球分布,中国海及邻近海域可能仅有支系A的存在,支系B、C和D分布于特定海域。尖棘长角螺也存在明显的谱系地理结构,西北太平洋北赤道流南北两侧存在2个不同的支系,分布于吕宋海峡的支系E为一新的谱系分支。各支系内mtCOI基因的K2P遗传距离在0~0.026之间,支系间的遗传距离在0.031~0.089之间。膨凸长角螺(C. convexa)和曲形长角螺(C. recurva)没有明显的地理遗传分化。18S rRNA基因支持支系D为独立种,但不支持其他支系的划分。矛头长角螺和尖棘长角螺内部可能存在隐存多样性。洋流可能会成为物种扩布和基因交流的障碍。  相似文献   

中国沿海球形棕囊藻(Phaeocystis globosa)的分类、分布及其藻华     

沈萍萍  齐雨藻  欧林坚 《海洋科学》2018,42(10):146-162

球形棕囊藻(Phaeocystis globosa Scherffel)是全球海洋广泛分布的有害藻华种类。1997年10月,中国东南沿海首次暴发了此种藻类的大规模藻华,其后陆续在福建、广东、广西、海南、河北及天津等省市沿海暴发多起同种藻华。中国近海的球形棕囊藻藻华呈现两大独有的特点,即藻类囊体较大(可达3厘米),以及藻华可毒害养殖业。历经20多年,球形棕囊藻在中国沿海已从一个"藻华新记录种"变成了"藻华常见种"。值得注意的是, 2014年以来,广西北部湾海域棕囊藻藻华肆虐,威胁核电冷源安全,受到了社会高度关注,也对球形棕囊藻藻华的研究提出了新的挑战与要求。针对这一生态灾害的最新发展趋势,本文总结了20年来中国球形棕囊藻及其藻华灾害的发生与发展状况,分别就棕囊藻的分类、生活史特征、营养特性、藻华形成的环境驱动因素、生态毒理等诸多方面开展简要综述,冀望为棕囊藻藻华的研究及防治提供基础资料及思路。  相似文献   

黄海獐子岛几种大型红藻的分类研究     

王艺晓  陈彦伟  杨楠  丁兰平  刘金梅  姜晶晶  黄冰心 《中国海洋大学学报(自然科学版)》2020,(2):75-84

对2017年8月采集自辽宁大连獐子岛的部分红藻门海藻样品进行形态分类学研究。经鉴定,样品中包含角叉菜属1种及1变种,即角叉菜(Chondrusocellatus Holmes)和角叉菜小型变型(C.ocellatus f.parus Mikami);马泽藻属1种,即日本马泽藻(Mazzaella japonica(Mikami)Hommersand);蜈蚣藻属4种,即亚洲蜈蚣藻(Grateloupia asiatica Kawguchi et Wang)、链状蜈蚣藻(Grateloupia catenata Yendo)、青岛蜈蚣藻(Grateloupia qingdaoensis Li et Ding)和带形蜈蚣藻(Grateloupia turuturu Yamada)。文中提供了详细的物种鉴定特征描述、解剖学特征图片及生物地理分布信息等内容,研究结果丰富了中国黄海北部地区红藻门的物种多样性,对该地区海藻资源的保护和利用提供了一定的分类学依据。  相似文献   

Inoceramid bivalves and biostratigraphy of the upper Albian and lower Cenomanian of the United States Western Interior Basin     

《Cretaceous Research》2016

Inoceramid bivalves of the upper Albian and lower Cenomanian of the United States Western Interior are revised, Eleven species-level taxa and three genera are described. Two new species, Gnesioceramus mowriensis, characterizing the Mowry Shale of the early, but not the earliest, Cenomanian, and Posidonioceramus merewetheri, of the lower Cenomanian, and on new genus, Posidonioceramus, are recognised. The Western Interior inoceramid species from this interval are strongly endemic and are not good tools for long-distance correlations, although they are very effective in regional dating.In terms of the inoceramid biostratigraphy, middle and upper parts of the upper Albian can be referred to the Gnesioceramus Biozone, represented by G. comancheanus (Cragin) and G. bellvuensis (Reeside). These taxa are endemic to the Western Interior and some adjacent areas (Gulf Coast; Greenland?), but are closely allied to the cosmopolitan species, Gnesioceramus anglicus (Woods). At approximately the Albian-Cenomanian boundary, the endemic clade of ‘Inoceramus’ nahwisi appears, now referred to the newly erected Posidonioceramus, resulting in a distinct P. nahwisi biozone. This zone corresponds to the lower part of the ammonite Neogastroplites’ stratigraphic range. Gnesioceramids re-appear in the early Cenomanian. Close to base of the Cenomanian, for the first in the Western Interior, the genus Inoceramus, represented by Inoceramus irenensis Warren and Stelck, 1958, apparently immigrated into the Western Interior Basin.The Western Interior inoceramids do not allow for direct correlation to chronostratigraphic standard subdivision. The Albian-Cenomanian boundary, as earlier recognized on geochronologic correlations and confirmed, to some extent, based on ammonites, may approximately be located close to the appearance level of the genus Posidonioceramus.  相似文献   

New Cretaceous Scoliidae (Vespida=Hymenoptera) from the Lower Cretaceous of Spain and Brazil     

A. P. Rasnitsyn  X. Martínez-Delcls 《Cretaceous Research》1999,20(6):767

A new genus, Cretaproscolia, and three new species of scoliid wasps, Archaeoscolia hispanica, Cretoscolia montsecana and Cretaproscolia josai, are described from the Lower Cretaceous of Spain and Brazil. The species representing the new genus is attributed to the plesiomorphic extant subfamily Proscoliinae, while the two other new species are assigned to two previously described genera in the extinct, archaic subfamily Archaeoscoliinae. The Brazilian species is the first Mesozoic scoliidid to have been described from the New World.  相似文献