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排序方式: 共有41条查询结果,搜索用时 15 毫秒
11.
As one of the important microzooplankton in marine pelagic habitats, tintinnids are classified as neritic genera,oceanic genera and cosmopolitan genera. Until now, we know little about the interaction between neritic and oceanic genera in continental shelves. Low species richness area was found in the mixing area between neritic and oceanic genera in the East China Sea. In this study, we investigated the spatial distribution of tintinnid community throughout the entire Bohai Sea in May(spring) of 2014 to find out:(1) whether the tintinnid assembalges differed in the three major bays bordering this shallow inland sea;(2) whether there was low species richness area in the Bohai Sea. Three genera and 11 species attributed to neritic and cosmopolitan taxa were reported from this region. Tintinnid abundance averaged(81±216) ind./L(0–1 234 ind./L). Tintinnid community differed within the three major bays, with each characterized by different tintinnid taxa. Referring to the average abundance of three bays, tintinnids were most abundant in the Laizhou Bay((328±445) ind./L), and least abundant in the Liaodong Bay((34±57) ind./L). A low species richness area occurred in the central Bohai Sea(20–40 m isobaths), in some stations of which no tintinnid was recorded. Our study demonstrates that tintinnid community varied greatly over small spatial scales, and low species richness area was found in the mixing area between neritic and oceanic genera within this inland sea. 相似文献
12.
Wintertime meso-scale horizontal distribution of large tintinnids in the southern Yellow Sea 总被引:1,自引:0,他引:1
Spatial distribution of some large tintinnid species (nominally > 76 μm) is investigated on samples vertically towed in the southern Yellow Sea in winters of 2001 to 2004. Nine tintinnid species are recorded: Codonellopsis morchella, Stenosemella pacifica, S. steini, Tintinnopsis schotti, T. radix, T. karajacensis, Eutintinnus tenuis, Parafavella sp., Leprotintinnus neriticus, of which C. morchella and T. radix dominated in the warm tongue-shaped zone of the Yellow Sea Warm Current (YSWC), and S. pacifica i... 相似文献
13.
Meso-scale spatial distribution of large tintinnids in early summer in southern Yellow Sea 总被引:2,自引:0,他引:2
The spatial distribution of some large tintinnid species (nominally〉76 μm) was investigated according to samples collected by vertical towing in cruises to the southern Yellow Sea in summer 2000-2002 and 2004. Eight species were identified: Codonellopsis mobilis, Leprotintinnus netritus, Tintinnopsis karajacensis, T. japonica, T. kiaochowensis, T. butschlii, T. radix, and Parafavella sp. With maximum abundance of 158.2 ind/L in June 2004, C. mobilis was the dominant species, lasting from May to July 2004. Tintinnid communities were patchy and distributed mainly in shallow waters along the shore. 相似文献
14.
1 IntroductionForthepast 1 5years,muchattentionofoceanographershasbeenfocusedontheroleofironinlimiting phytoplankton productivityinthehigh nutrient ,low chlorophyll(HNLC)regions.OnboardshipironenrichmentincubationshavebeencarriedoutinthethreewellknownHNLCregions :notablyequatorialPacificOcean ,subarcticPacificO ceanandSouthernOcean (seereferencesinTable 1 ) .Theinsituironenrichmentexper imentshavebeenaccomplishedintheequatorialPacific (IronEx1in 1 993 (Wells 1 994)andIronEx2in 1 996(… 相似文献
15.
饵料浓度对中华哲水蚤摄食的影响 总被引:15,自引:2,他引:13
用饵料浓度差减法和排粪率法研究中华哲水蚤(Calanus sinicus)在饵料(青岛大扁藻、新月菱形藻)浓度从1500到350000个/cm3时摄食率的变化。实验证明中华哲水蚤具有很强的摄食潜力,摄食率在实验饵料浓度范围内一直在增加,在较低的饵料浓度(如青岛大扁藻4000个/cm3)下停止摄食。 相似文献
16.
Bacterial diversity and community structure in the East China Sea by 454 sequencing of the 16S rRNA gene 总被引:1,自引:0,他引:1
The 454 sequencing method was used to detect bacterial diversity and community structure in the East China Sea. Overall, 149 067 optimized reads with an average length of 454 nucleotides were obtained from 17 seawater samples and five sediment samples sourced in May 2011. A total of 22 phyla, 34 classes, 74 orders, 146 families, and 333 genera were identified in this study. Some of them were detected for the first time from the East China Sea. The estimated richness and diversity indices were both higher in the sediment samples compared with in the seawater samples. All the samples were divided by their diversity indices into four regions. Similarity analysis showed that the seawater samples could be classified into six groups. The groups differed from each other and had unique community structure characteristics. It was found that different water masses in the sampling areas may have had some influence on the bacterial community structure. A canonical correspondence analysis revealed that seawater samples in different areas and at different depths were affected by different environmental parameters. This study will lay the foundation for future research on microbiology in the East China Sea. 相似文献
17.
18.
桑沟湾浮游纤毛虫丰度和生物量分布的季节变化 总被引:1,自引:0,他引:1
于2011年4、8、10月及2012年1月对桑沟湾进行了浮游纤毛虫丰度和生物量的季节调查。纤毛虫的平均丰度为(7 552±10 979)个/L,范围为408~61 667个/L;纤毛虫的平均生物量(以碳计)为(4.79±5.77)μg/L,范围为0.35~33.09 μg/L。无壳纤毛虫丰度和生物量主要分布在湾内,湾中和湾外丰度相对较低;砂壳纤毛虫丰度和生物量在盐度较高的海区总体较高,呈现朝向外海分布的趋势。纤毛虫丰度和生物量的高值区春季主要出现在湾的西北,夏季向湾中部迁移,秋季主要出现在湾的西南,冬季主要出现在湾的西部,高值区随季节大致呈顺时针迁移的趋势。纤毛虫的丰度春季最高,冬季最低;生物量夏季最高,冬季最低。无壳纤毛虫夏季粒级较大,冬季粒级较小;砂壳纤毛虫壳的平均口径夏季较大,秋季较小。共鉴定出砂壳纤毛虫8属27种,其中拟铃虫属(Tintinnopsis)种数最多。砂壳纤毛虫在纤毛虫总丰度中的比例平均为16.3%±21.9%,夏季最高(36.3%±27.8%),冬季最低(4.9%±5.9%)。纤毛虫丰度与温度、盐度、Chl a浓度及微微型真核浮游生物丰度均没有明显的相关性,但与蓝细菌及异养细菌丰度呈显著的正相关关系。 相似文献
19.
二叠纪海相碳酸盐的锶同位素演化及其意义 总被引:4,自引:0,他引:4
本文从沫阳和熊家场剖面二叠纪海相碳酸盐和玄武岩的锶同位素变化出发,讨论了碳酸盐的锶同位素组成与峨嵋山玄武岩喷发之间的关系,以及玄武岩中海相碳酸盐的锶同位素贫化原因,指出海相碳酸盐的锶同位素组成可作为了解地球构造演化的工具。 相似文献
20.
海洋浮游生态系统中小型浮游动物的生态功能 总被引:8,自引:0,他引:8
小型浮游动物在海洋生态系统中的作用,主要指有多少能量通过小型浮游动物传递到桡足类,从而比较沿"浮游植物→中型浮游动物"和"浮游植物+细菌→小型浮游动物→中型浮游动物"两条食物链到达中型浮游动物的能流大小.为达到这个目的,需要研究各个能流路径的传递效率,即能量在各个营养级(初级生产--小型浮游动物,细菌生产--小型浮游动物,小型浮游动物的生长率,小型浮游动物--中型浮游动物)的传递效率.综述了国内外对上述营养级传递效率的研究现状,以期为我国的同类研究提供参考.浮游植物初级生产力被小型浮游动物摄食的比例平均为每天60%~75%,大大高于桡足类对浮游植物初级生产力的摄食压力每天10%.海洋浮游细茵的二次生产力相当于初级生产力的30%.其中80%~180%被小型浮游动物摄食.小型浮游动物的毛生长率为30%~40%,生产力是初级生产力的21%~34%.在西班牙西北部沿海,桡足类每天摄食2%~51%小型浮游动物生产力.因此,桡足类通过微食物网摄食的能量是初级生产力的0.4%~17%,与桡足类摄食初级生产的10%处于同一量级.不考虑碎屑提供的能流,小型浮游动物对桡足类饵料的贡献为20%以上,甚至可高达50%. 相似文献
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