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A new species belonging to the genus Haloschizopera Lang, 1944 (Copepoda, Harpacticoida, Miraciidae, Diosaccinae) was identifi ed based on the samples collected from the East China Sea, near the off shore of Zhejiang Province, East China. The new species is closely related to H . pygmaea Norman & Sccot T., 1905 and shares a combination of the following features: A1 eight-segmented;A2 exp-2 with one distal seta, exp-3 with three setae;P1 endopodal segments subequal, enp-1 not exceeding exp-2;exp-3 of P3 with one inner seta, of P4 with two inner setae. The new species is characterized by the presence of one inner seta on P2 exp-3 of both sexes. It can also be distinguished from its congeners by the characters of female: P5 exopod subcircular, endopodal lobe extending beyond half-length of exopod;genital doublesomite ornamented with three dorsolateral rows of spinules on anterior part. 相似文献
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2001年8月至2002年7月,对厦门岛东海岸黄厝沙滩底栖甲藻的种类组成和优势种的时空分布进行了为每月一次的调查,共鉴定甲藻种类46种,其中底栖种39种,常见种14种,优势种4种.Amphidinium britannicum和Adenoides sp.为冬春季优势种,Herdmania litoraris和Peri-dinium quinquecorne为夏秋优势种,优势种的季节更替比较明显.夏秋季节的种数多,冬春季节的种数少,细胞数量高峰出现在春夏季,秋冬两季数量很少,由夏季的200多个每克干沙减少到冬末的0~4个/g干沙;多样性指数和均匀度呈双峰型分布,峰值出现在10和2月,谷值出现在12月和7月.空间分布上,底栖甲藻的总细胞密度和优势种的细胞密度呈现由高潮带向中、低潮带增加的趋势.分析了影响厦门东海岸沙滩底栖甲藻时空分布的主要因素,并探讨了沙滩底栖甲藻与近岸赤潮及着色砂现象的关系. 相似文献
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印度尼西亚北苏拉威西蓝碧海峡浮游动物种类组成及分布 总被引：1，自引：0，他引：1
Based on oceanographic survey data in June 2012 in the Lembeh Strait, the zooplankton ecological characteristics such as species composition, individual abundance, dominant species and distribution were analyzed. The results showed that 183 species(including 4 sp.) had been recognized, most of them belonged to copepoda.Cnidaria followed with 43 species(including 1 sp.) were identified. The average abundance of zooplankton was(150.47±58.91) ind./m~3. As to the horizontal distribution, the abundance of the zooplankton was higher in the southern waters than in the northern waters. The dominant species in the study area were Lensia subtiloides,Sagitta enflata, Lucifer intermedius, Oikopleura rufescens, Diphyes chamissoni, Creseis acicula, Subeucalanus subcrassus, Temora discaudata, Aglaura hemistoma, Doliolum denticulatum, Canthocalanus pauper, Oikopleura longicauda and Nanomia bijuga. Zooplankton biodiversity indexes were higher in study area than previous study in the other regions. The findings from this study provide important baseline information for future research and monitoring programs. 相似文献
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中国海域一些水螅水母类种类名的订正 总被引：4，自引：0，他引：4
本文订正了中国海水螅水母类分类学名31种,其中有3种新组合,例如青岛双手水母,新改级;厦门枝刺水母,改隶新组合;胶州和平水母,改级新组合。并报道一种我国新纪录的柯氏侧丝水母。 相似文献
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Cheng Xinrong 《海洋学报(英文版)》1995,14(4):525-535
Ｄｉｓｔｒｉｂｕｔｉｏｎ ｏｆ ｄｏｍｉｎａｎｔ ｓｐｅｃｉｅｓ ａｎｄ ａｂｕｎｄａｎｃｅ ｏｆ ｎａｎｎｏｆｏｓｓｉｌｓ ｉｎ ｓｕｒｆａｃｅ ｓｅｄｉｍｅｎｔｓ ｏｆ ｔｈｅ ｃｅｎｔｒａｌ ａｎｄ ｎｏｒｔｈｅｒｎ ｐａｒｔｓｏｆ ｔｈｅ Ｓ... 相似文献
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L Roberson H Winker C Attwood L De Vos C Sanguinetti A Götz 《African Journal of Marine Science》2015,37(4):543-556
This first survey of fish in the Betty's Bay Marine Protected Area (MPA), on the south coast of South Africa, was conducted using baited remote underwater video systems (BRUVs). A total of 58 deployments recorded 42 species in 20?km2, including reef, kelp and sand habitats in protected and exploited zones, at between 5 and 40?m depth. Chondrichthyans accounted for 28% of diversity. Teleost diversity was dominated by Sparidae, Cheilodactylidae, Sciaenidae and Ariidae. Diversity (H′) was highest in kelp and lowest over sand. Species composition differed among habitat and depths, but protection had no effect. Among four commercial species, only Pachymetopon blochii responded positively to protection. The apparent failure of protection may attest to poor compliance, but an investigation into fish size might show an effect. Many species were detected at the western extreme of their range. Diversity in Betty's Bay was predictably lower than in the more eastward Stilbaai MPA, but also lower than in the westward Table Mountain National Park MPA. Fish diversity did not follow a linear increase eastwards from Cape Point. Betty's Bay includes the most easterly protected kelp forests and contains seven species not recorded in the other two areas, and is therefore an important element in the MPA network. 相似文献
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利用2003年6月和2006年6月在长江口及邻近海域进行的两次大面调查所采集的浮游动物网采样品,对长江口及邻近海域水母类的种类组成、优势种、数量分布及生态类群等进行了探讨。结果表明:研究水域共记录水母类77种,其中水螅水母60种,管水母12种,钵水母1种,栉水母4种。优势种有:五角水母(Muggiaea atlantica),双生水母(Diphyes chamissonis),拟细浅室水母(Lensia subti-loides),四叶小舌水母(Liriope tetraphylla),两手筐水母(Solmundella bitentachlata),嵊山秀氏水母(Sugiura chengshanense)和瓜水母(Bere cucumis)等。其中水螅水母类的优势种存在较大的年际变化,2003年为嵊山秀氏水母,2006年为四叶小舌水母和两手筐水母。研究水域内水母类平面分布不均匀,2003年平均丰度为13.3个/m3,除在长江口外存在一个由河口低盐种贝氏拟线水母(Nemopsis bachei)大量聚集形成的高值区外,在舟山群岛南部还存在一个密集中心;2006年水母类丰度略有上升,平均丰度为16.0个/m3,与2003年相比,其密集中心向东北部偏移。2006年6月研究海域温、盐较2003年同期均大幅升高是造成两航次优势种类更替及水母类分布变化的主要原因。 相似文献
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Diatoms are a globally successful and eukaryotic photosynthetic organism with an ornamented silica external wall. The relationship between their valve morphology and habitat means that diatoms can be used as bioindicators to characterize the aquatic environment. To estimate the differential distribution and diversity of diatom assemblages along the coastal line, we collected phytoplankton samples from 114 coastal sites of waters of R. O. Korea. We applied the unweighted pair-group technique usin... 相似文献
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The inferential basis of species hypotheses: the solution to defining the term 'species' 总被引：2，自引：0，他引：2
Kirk Fitzhugh 《Marine Ecology》2005,26(3-4):155-165
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作者根据2012年5月和2013年11月对日照近岸海域进行的底拖网调查资料,分析了该海域虾蟹类的种类组成、优势种和生物多样性。调查海域共捕获虾蟹类25种,根据相对重要性指数计算优势种为8种,其中经济价值较高的中大型虾蟹类5种,分别为:口虾蛄(Oratosquilla oratoria)、戴氏赤虾(Meraenaeopsis dalei)、鹰爪虾(Trachypenaeus curvirostris)、日本[虫寻](Charybdis japonica)和三疣梭子蟹(Portunus trituberculatus)。分别计算了日照近岸海域春、秋季虾蟹类群落的多样性指数(H')、丰富度指数(D)和均匀度指数(J)。该海域虾蟹类群落多样性整体处在较低的水平,在生物量和丰度上经济较高的中大型虾蟹类物种占据优势。 相似文献
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The eastern stock of Atlantic bluefin tuna (thunnus thynnus) was recently nominated for protection under the Convention on International Trade in Endangered Species of Flora and Fauna (CITES). That nomination failed, which leaves management of the heavily overfished stock in the hands of the International Commission for the Conservation of Atlantic Tunas (ICCAT). This paper reviews the history of ICCAT management of Atlantic bluefin tuna to show that (1) early elimination of competitive forces prevented agreement on management in keeping with scientific advice, resulting in the steep decline of the stock, (2) even just the threat of a CITES listing can provide temporary impetus for marked improvement in ICCAT management, and (3) long-term sustainable management by ICCAT will require continued economic and political pressure. 相似文献
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2010年胶州湾网采浮游植物种类组成与数量的周年变化 总被引：2，自引：1，他引：1
为了研究胶州湾网采浮游植物的种类组成与数量变化,作者根据2010年的胶州湾调查资料,对调查区浮游植物丰度、优势种类和季节变化进行分析研究。结果表明,胶州湾浮游植物主要由硅藻和甲藻两大类组成,硅藻占据绝对优势地位。除了7月以外,甲藻/硅藻比均0.2。生态类型主要以近岸广布种和暖温带种为主,在不同季节也出现了少数暖水种和外洋种。浮游植物丰度表现为明显的"双周期",冬、春两季较高,夏、秋两季较低。2月为全年最高峰,数量为1108×104个/m3,10月为夏、秋两季的高峰,数量为458.7×104个/m3。浮游植物群落的多样性指数平均为1.9。 相似文献
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Preliminary study on seasonal succession and development pathway of phytoplankton community in the Bohai Sea 总被引：5，自引：3，他引：5
IThe Phytoplankton spoteS succession is a major characteristic Of PhytOPlankton behavior inthe an, and is Of major swificance tO PhytOPlankton d~cs and in coupling the PhytOPlankton cornxnunity to hasher trophic levels (Smayda, 1980). But another conception species ence that be defined by BraarUd often confUSeS with speCies sucCeSSion. Spotes su~ is thechange of speCies compeition within a given water mass resulting from changing physical,chemical and biological factors within the wa… 相似文献
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秦皇岛海域浮游植物的群落结构特征 总被引：1，自引：0，他引：1
2014年4~9月对秦皇岛海域进行了调查,共鉴定出浮游植物3门33属70种,以硅藻门为主,7、8月份浮游植物种类数最多,约40种。在整个调查期间,浮游植物丰度在不同站位和月份之间差异较大,平均值为2.42×108个/m3,浮游植物优势种有北方娄氏藻、尖刺拟菱形藻、丹麦细柱藻、微小原甲藻等,优势种种类数9月最多,6月最少。浮游植物多样性指数为1.27~3.6,均匀度为0.31~0.73,6月份群落结构较单一,其他月份群落结构较稳定。 相似文献
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通过对南海采集的沉积物进行分析,发现一新种奇足威伦狭腹猛水蚤,这也是首次在中国海报道威伦狭腹猛水蚤属。新种奇足威伦狭腹猛水蚤与同属其它种的主要区别特征是：身体表面除尾节有小刺外,其余各节表面均光滑;第四胸足外肢第三节内侧具两根刚毛;雌性第五胸足內肢具4根刚毛和刺,外肢顶端具一根尖刺,尾叉长约为宽的六倍。 相似文献
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M. Hourston I.C. Potter R.M. Warwick F.J. Valesini K.R. Clarke 《Estuarine, Coastal and Shelf Science》2009
This study has determined the ways in which the density, number of species, species composition and trophic structure of free-living nematode assemblages in the subtidal waters of a large southern hemisphere microtidal estuary change spatially and seasonally, and has explored whether those four biotic characteristics are related to certain environmental factors. Based on data derived from samples collected seasonally at 12 sites throughout the estuary, the densities and number of species of nematodes decreased progressively with distance from estuary mouth, to reach a minimum at sites where salinities were most variable, and then increased slightly in the uppermost part of the estuary where salinities were least. Densities were also generally greatest in spring, due largely to increases in the abundance of epistrate-grazing species at this time and thus when the amount of primary food (microphytobenthos) peaked. The spatial distribution of the composition of the nematode assemblages was closely correlated with salinity and, to a lesser extent, grain-size composition and amount of particulate organic material (%POM) in the sediment. Although species composition changed sequentially along the estuary, the change was particularly pronounced between sites above and below the area where salinities started to decline markedly and become more variable and %POM increased markedly. This reflected, in particular, far greater abundances of Spirinia parasitifera at the six downstream sites and of Theristus sp. 1 at the six sites further upstream. Species composition underwent pronounced seasonal cyclical changes at all sites, presumably reflecting interspecific differences in the timing of peak reproduction and thus of recruitment. The trophic structure of the nematode assemblages changed both spatially and temporally in relation to the relative abundance of different food sources. Thus, for example, non-selective deposit feeders, such as Theristus sp. 1, dominated samples in the upper estuary, where %POM was by far the greatest, and was rare or absent at downstream sites. Conversely, epistrate grazers, such as species of the Chromadoridae, were most abundant at downstream sites in spring, when the density of the microphytobenthos reached its maximum. 相似文献
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海洋微型鞭毛虫是海洋微型真核浮游生物中非常重要的一大类群,在构成和维持海洋生态系统的结构和功能中扮演着重要角色。微生物群落通常由少数优势种和大量稀有种组成,这种分布模式在海洋微型鞭毛虫群落中也极为常见,并且二者的内在特征可能对群落生物地理分布格局以及生态系统功能产生不同影响。然而在多数研究中并未将两种不同亚群落进行区分,对二者的分布特征、对环境和空间因子的响应以及在总体群落中的生态地位等的认识十分有限。本研究利用高通量测序技术,调查了中国近海亚热带 热带3个自然海区微型鞭毛虫群落中优势种和稀有种的分布特征,并探讨了环境因子和空间因子与不同亚群落之间的关系,利用中性模型揭示了中性过程在群落构建中的作用,最后通过共现网络分析解析了两种不同亚群落在总体群落中的生态地位。结果表明：3个海区微型鞭毛虫群落中的优势类群和稀有类群在多样性和物种组成上具有不同的特征,表现出一定的生物地理分布格局;这与它们受到不同程度环境因子和空间因子的驱动作用有关;中性模型的结果体现了随机过程在两种亚群落中的重要作用;最后,共现网络关系反映出不同丰富程度的生态类群具有重叠但又相异的生态位,从而在同一环境中形成物种的共存,维持了群落结构的稳定,而稀有类群以较高的连接度和更高比例的关键种数目,在网络关系中起到重要的连接作用。本研究初步揭示了中国近海微型鞭毛虫优势种和稀有种的分布特征和建群机制,为深入认识海洋微型鞭毛虫的群落结构、分布格局以及影响其群落构建的生态过程提供理论依据。 相似文献