共查询到19条相似文献，搜索用时 156 毫秒
1.
越南沿海的双壳纲软体动物 总被引：2，自引：1，他引：1
报道了越南沿海的双壳钢软体动物320种，隶属3亚纲，6目，26总科，41科，148属，从种类的组成中，帘蛤科有57种，蚶科32种，樱蛤科29种，贻贝科25种，鸟蛤科16种，牡蛎科14种，蛤蜊科13种，珍珠贝科和扇贝科各12种，紫云蛤科11种，竹蛏科10种，其他各科的种类均在7种以内，按种的性质而论，越南沿海主要是由热带种和亚热带种类组成，还有与珊瑚礁紧密联系的热带种，就越南沿海双壳纲软体动物分类区系而论，应属印度－西太平洋区的印尼－马来亚区。 相似文献
2.
报道了中国南沙群岛的双壳纲贝类141种,分隶于5亚纲8目36科77属.从种类的组成中,帘蛤科有18种,蚶科15种,扇贝科11种,鸟蛤科10种,锉蛤科8种,贻贝科、海菊蛤科和樱蛤科各7种,砗磲科6种,其他各科的种类均在5种以内.按种的性质而论,大多数属于和珊瑚礁有密切联系的热带种或亚热带种,区系性质为印度-西太平洋区的印尼-马来亚区. 相似文献
3.
中国南沙群岛的双壳纲贝类 总被引：2，自引：0，他引：2
报道了中国南沙群岛的双壳纲贝类141种，分隶于5亚纲8目36科77属。从种类的组成中，帘蛤科有18种，蚶科15种，扇贝科11种，鸟蛤科10种，锉蛤科8种，贻贝科、海菊蛤科和樱蛤科各7种，砗磲科6种，其他各科的种类均在5种以内。按种的性质而论，大多数属于和珊瑚礁有密切联系的热带种或亚热带种，区系性质为印度-西太平洋区的印尼-马来亚区。 相似文献
4.
雷州半岛红树林海区的软体动物 总被引：3，自引：0，他引：3
2 0 0 2年 7～ 9月 ,对雷州半岛主要红树林区的软体动物进行调查 ,计有 110种 ,隶属 3纲、6亚纲、12目、37科、75属 ,主要为亚热带海岸区系种类。其中全国沿海广泛分布的暖水种有 36种 ,占 32 .8% ;分布于东、南沿海的暖水种有 6 0种 ,占 5 4.3% ;分布于南海的暖水种有 13种 ,占 11 8% ;1种外来种 ,占 0 .9% ;具有较高经济和可以开发利用的贝类约占总数的 1/2。由于人为过度采捕和环境污染严重 ,部分软体动物资源已遭到破坏 ,因此 ,急需加强红树林区生态保护和环境污染整治。 相似文献
5.
雷州半岛红树林海区的软体动物 总被引：10，自引：1，他引：9
2002年7—9月，对雷州半岛主要红树林区的软体动物进行调查，计有110种，隶属3纲、6亚纲、12目、37科、75属，主要为亚热带海岸区系种类。其中全国沿海广泛分布的暖水种有36种，占32．8％；分布于东、南沿海的暖水种有60种，占54．3％；分布于南海的暖水种有13种，占11．8％；1种外来种，占0．9％；具有较高经济和可以开发利用的贝类约占总数的1／2。由于人为过度采捕和环境污染严重，部分软体动物资源已遭到破坏，因此，急需加强红树林区生态保护和环境污染整治。 相似文献
6.
7.
广东南澳岛贝类区系的研究 总被引：1，自引：0，他引：1
本文报导南澳岛的贝类375种,按水平分布可分4组:(1)84种为我国沿海广温广布种;(2)144种分布于东海和南海的亚热带种;(3)141种分布于南海的亚热带—热带种;(4)6种为分布于黄、渤海的温带种。南澳岛的贝类区系大多由暖水性亚热带种组成,属印度—西太平洋区系区中国—日本亚区。 相似文献
8.
蔡英亚 《广东海洋大学学报》1978,(2)
1975年4月,我们在海南岛三亚采集贝类标本,从浅海捞起的珊瑚中,采到一种奇特的双壳类软体动物,经鉴定其学名为拟海菊足蛤 Pedum spondylioideum(Gmelin)。这种贝类属瓣鳃纲(Lamellibranchia)、异柱目(Anisomyaria)、扇贝超科(Pactinacea),扇贝科(Pectinidae),足蛤属(Pedum)。足蛤属全世界目前唯有报导过这一种,在我国是首次纪录,现简介如下:1.标本采集地广东省海南岛崖县(三亚)。 相似文献
9.
施氏獭蛤(Lutraria sieboldiiReeve)俗称象鼻螺,隶属瓣鳃纲(Lamellibranchia)、异齿亚纲(Heterodon-ta)、帘蛤目(Veneroida)、蛤蜊总科(Mactracea)、蛤蜊科(Mactridae)、獭蛤属(Lutraria),自然分布于热带、亚热带的海区,在我国主要分布在浙江、广东、广西和海南的部分沙或沙泥底质的海区。施氏獭蛤足部和水管非常发达,肉质鲜美,经济价值较高。其生长速度较快,一龄贝平均壳长可以达到6 cm以上,养殖1.5 a即可达到理想的商品规格,适于人工养殖。李琼珍等对大獭蛤的胚胎、幼虫及稚贝发育及盐度对大獭蛤胚胎发育的影响进行了研究[3,4],蔡英亚… 相似文献
10.
流沙湾的底栖大型海藻调查 总被引：1，自引：0，他引：1
2008年3月～2009年1月调查了流沙湾潮间带及湾内(109°55'～109°59'E,20?22'～20°28'N)底栖大型海藻资源,定性、定量分析该海湾底栖大型海藻种类、生态分布、区系性质、群落结构及生物量的季节变化规律。共采集底栖大型海藻3门10目17科19属32种,其中红藻门4目9科9属15种,绿藻门4目6科7属14种,褐藻门2目2科3属3种,以亚热带藻种占绝对优势,达59.4%,温带成分21.9%,热带成分18.7%。采样海藻具印度-西太平洋海洋植物区系中国-日本亚热带海洋植物亚区特点。调查区域内底栖大型海藻群落组成的季节变化明显。 相似文献
11.
The three dimensional structure of the western boundary current east of the Vietnam coast was determined from measurements
by Argo profiling floats which deployed near the east of the Vietnam Coast in October 2007. The trajectories of the Argo floats
provided robust evidence that there does exist southward flowing current along the Vietnam coast. The southward current begins
at about 15°N, 111°E, flowing along the 1 000 m isobath and extending to 5°N south. The estimated surface and parking depth
velocities obtained from the floats suggest that this southward current can extend to 1 000 m depth. The mean surface velocity
of the western boundary current is about 49 cm/s, with the maximum speed exceeding 100 cm/s occurring at 11.6°N, 109.5°E in
the direction of 245°. The mean parking depth (1 000 m) velocity is 12–16 cm/s with the maximum speed of 36 cm/s occurring
at 12.1°N, 109.7°E in the direction of 239°. 相似文献
12.
中越北部湾红树林差异性研究 总被引：1，自引：0，他引：1
红树林是一种能够同时适应海洋和陆地的一种特殊植物种类,分布在约30°S~30°SN之间的热带、亚热带海岸和河口交界的潮间带上。红树林的分布除了受自然条件和气候的制约,还受一定程度的人为活动的干扰。本文选取了地貌、气候相似和经济发展不同的中国广西段和越南北部段的2个相邻海岸作为研究区,基于Landsat TM遥感影像,采用监督分类和人工解译的方法,获取了研究区1988、2000和2015年3个时期的红树林分布数据,并对比分析了2个岸段红树林时空转化、景观格局变化及驱动力的差异。研究表明：① 1988-2015年,中国广西段红树林面积呈增长趋势,2000年比1988年增长18%、2015年比2000年增长了75%;越南北部段先减少后增加,2000年红树林面积比1988年减少了20%,2015年比2000年增加了50%;② 红树林景观格局方面,中国广西段红树林平均斑块面积相对较小、破碎程度高,斑块形状较规则,趋近于正方形,受人为因素干扰程度较大,而越南北部段红树林斑块面积大、破碎化程度低,斑块呈带状或条状分布,受人为因素干扰的程度较小。 ③ 主要人为驱动因素方面,影响中国广西段红树林变化的主要人为驱动因素是变化的,1988-2000年以围垦建造养殖池为主,2000-2015年则以城镇用地和工矿建设为主,而越南北部段在1988-2015年一直以围垦养殖池为主。 相似文献
13.
Using 10-year (January 1998–October 2007) dataset of Sea-viewing Wide Field-of-view Sensor (SeaWiFS), we extracted the dominant spatial patterns and temporal variations of the chlorophyll distribution in the central western South China Sea (SCS) through Empirical Orthogonal Function (EOF) analysis. The results show that the first EOF mode is characterized by a high chlorophyll concentration zone along the Vietnam coast. We found two peaks in summer (July–August) and in winter (December), respectively, in no... 相似文献
14.
Gigantidas platifrons(Bivalvia,Mytilidae),the dominant species at the Formosa cold seep,relies on methanotrophic symbionts dwelling in its gills for nutrition.The reproductive patterns of G.platifrons provide fundamental information for understanding the population recruitment of this species.However,we know very little about important processes in reproduction,such as gametogenesis and symbiotic bacteria transmission.To this end,we described the developmental patterns of the gonads from nine surveys and juvenile length-distribution from one-year larval traps and detected bacteria in gonad from G.platifrons samples.Our results show that G.platifrons is a functionally dioecious species.The reproduction of G.platifrons is discontinuous,with spawning maturity peak around the fourth quarter of the year.The seasonal reproduction of G.platifrons was further supported by the unimodal shell length distribution of the trapped juvenile mussels.Given the small oocyte size(48.99-70.14 μm),which was comparable to that of coastal mussels,we proposed that G.platifrons developed via a free-living,planktotrophic larval stage before settlement.The blooms at the water surface can also supply the development of the planktonic larvae of G.platifrons.Meanwhile,no bacteria were observed in gonads,suggesting a horizontal symbiont transfer mode in this mussel.Collectively,these results provide fundamental biological information for an improved understanding of the early life history of G.platifrons in the Formosa cold seep. 相似文献
15.
《中国海洋湖沼学报》2017,(5)
The species richness of benthic harpacticoid copepod fauna in Jiaozhou Bay,Qingdao,on the southern coast of Shandong Peninsula,has not been comprehensively studied.We present a preliminary inventory of species for this region based on material found in nine sediment samples collected from 2011to 2012.Our list includes 15 species belonging to 15 genera in 9 families,the most speciose family was the Miraciidae Dana,1846(seven species);all other families were represented by single species only.Sediment characteristics and depth are determined to be important environmental determinants of harpacticoid distribution in this region.We briefl y detail the known distributions of species and provide a key to facilitate their identifi cation.Both harpacticoid species richness and the species/genus ratio in Jiaozhou Bay are lower than in Bohai Gulf and Gwangyang Bay.The poor knowledge of the distribution of benthic harpacticoids,in addition to low sampling ef fort in Jiaozhou Bay,likely contribute to low species richness. 相似文献
16.
Temporal and spatial variations in the distribution of macroalgal communities along the Yantai coast,China 总被引：1，自引：0，他引：1
To explore the impact of environmental variables on macroalgal communities, their temporal and spatial distributions were examined along the Yantai coast, China between April 2010 and March 2011. Macroalgae sampling was conducted monthly at four sites along the coast： Jiahe River estuary, Zhifu Island, Fisherman＇s Wharf, and Yangma Island. The species composition and abundance, and their relationship with environmental variables were assessed. Along the Yantai coast, 35 macroalgae species were identified, including 24 Rhodophyta spp., 7 Chlorophyta, and 4 Phaeophyta spp. Highest species numbers were recorded in the summer at all sampling sites, except in the Jiahe River estuary. Macroalgae biomass was the greatest in the summer. Year-round, the highest species number and dry biomass recorded at Fisherman＇s Wharf and Yangma Island was attributed to the substrate type. In summer, Ulva pertusa Kjellman was the dominant species identified along the Yantai coast, which indicates a risk ofmacroalgae blooms. Our results show that seawater temperature and nutrients appear to significantly affect the temporal and spatial patterns of macroalgal abundance along the Yantai coast. The effects of environmental variables on the macroalgae on the Yantai coast need further study. 相似文献
17.
利用PCR技术分别扩增连云港及启东沿海蛤蜊科的西施舌(Coelomactra antiquata)、中国蛤蜊(Mactrachinensis)和四角蛤蜊(Mactra veneriformis)3种双壳贝的16S rRNA基因片段和ITS2核苷酸序列,测序后用DNA star软件分析了核苷酸差异。结果显示:三种贝类16S rRNA基因片段长度相同,均为306bp(去除引物),核苷酸存在多态性,共有45个变异位点,54个核苷酸发生了变异,全部为碱基置换。西施舌与中国蛤蜊此片段核苷酸的同源性为88.9%,与四角蛤蜊的同源性为88.6%,中国蛤蜊与四角蛤蜊的同源性为90.6%。三种蛤蜊ITS2序列分别为390 bp(西施舌)4、41 bp(四角蛤蜊)和466 bp(中国蛤蜊),存在长度多态性,ITS2核苷酸差异分析结果显示,西施舌与中国蛤蜊的同源性为70.9%-71.1%,西施舌与四角蛤蜊的为70.5%-71.0%,中国蛤蜊与四角蛤蜊的同源性为88.1%-88.8%。ITS2序列分析结果与16S rRNA基因片段分析结果一致,2种分子分析法均显示中国蛤蜊与四角蛤蜊的亲缘关系近。 相似文献
18.
Randomly amplified polymorphic DNA (RAPD) technique was applied to assess the genetic variations and phylogenetic relationships
in 4 species ofPorphyra. The samples were collected from the coast of Canada, Vietnam, Zhoushan, Fujian and Qingdao in China. Amplifications with
20 primers were carried out under predetermined optimal reaction conditions (samples were first heated at 94°C for 5 min.
and followed by 45 cycles of 1 min at 94°C, 1 min at 36°C, and 2 min at 72°C, then held at 72°C for 10 min). The amplified
products were scored as present (1) or absent (0) for each DNA sample and an index of genetic similarity (F) was calculated
by using Nei & Li’s matching coefficient method (1979). The value of (1−F) was used to quantify the genetic distances between
species and construct a phylogenetic tree. The relationship indicated by the UPGMA and NJ cluster analysis on the values of
the genetic distance is in good overall agreement with classical taxonomy. The obvious differences between natural and cultivated
population ofP. haitanensi suggest that variation or hybridization with other species occurred during the culture.
Contribution No. 100 from the Experimental Marine Biology Laboratory, IOCAS.
Contribution No. 3289 from the Institute of Oceanology, Chinese Academy of Sciences.
The research supported by the Foundation of the Chinese Academy of Sciences. 相似文献
19.
大连地区碳酸盐岩分布广泛 ,裂隙溶洞发育 ,洞穴堆积物中蕴含了丰富的更新世哺乳动物化石和古文化遗物 ,在境内陆地和附近海域陆续发现了 30余处化石点。在众多的化石点中尤以古龙山遗址和大连动物群最引人注目 ,前者在同一地点内采集到 377种上万件的脊椎动物骨骼化石 ,并伴有石器、骨器、灰烬等远古人类活动的遗物 ;后者包括了 2 8种早更新世的小型哺乳动物 ,这是大连乃至东北地区的首次报导。这些事实说明了东北地区不只是仅有晚更新世的动物群 ,至少还有早更新世的大连动物群 ,即使在晚更新世 ,也不只是单一的披毛犀 -猛犸象动物群 ,还存在着具有从华北向东北过渡性质的古龙山动物群。今后工作中应注意寻找古人类及中更新世的哺乳动物化石 ,加强对全新世动物遗骨的研究。 相似文献