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1.
Wang Xianmin 《海洋学报(英文版)》1988,7(4):632-632
Trachidermus fasciatus is a species of catadromous fish in China. In order to elucidate the phenomenon of their seaward propagation, comparative studies of kidney histological structure of this species collected from fresh-water (salinity 10), sea-water (salinity 32) and artificial sea-water (salinity 17.5, 22.5) have been made. 相似文献
2.
Effect of UV-B radiation on the feeding behavior of the rotifer Brachionus plicatilis 总被引:3,自引:0,他引:3
Effect of UV-B radiation on the feeding behaviour of marine zooplankton is important to assessing the health harm of marine ecosystem due to the gradually enhanced UV-B radiation in air. However, there are a few studies on this topic. The feeding behavior of the rotifer, Brachionus plicatilis, under the treatment of UV-B radiation on five species of microalgae, i.e., Chlorella sp., Tetraselmis chuii, Isochrysis galbana Park 8701, Chaetoceros muelleri Lermumerman, and Nitzschia clostertum, was studied. The results showed that the filtering and feeding rates of the rotifer decreased significantly with the dose increase of UV-B radiation when fed with five species of microalgae respectively (P<0.05) which indicates UV-B radiation inhibits the feeding activities of the rotifer on microalage. The mixed culture experiments shows the rotifer preferred to feed Chlorella sp., then C. muelleri,I. galbana, N. clostertum and T. chuii in turn if without UV-B radiation. Under the highest dose of UV-B radiation treatment (2.70 kJ/m2), the rotifer preferred to feed C. muelleri, then Chlorella sp., N. clostertum, I. galbana and T. chuii in turn. Chlorella sp., I. galbana and C. muelleri became the more favorite foods of the rotifer while T. chuii and N. clostertum became less favorite foods. The change of feeding rate and feeding selectivity of zooplankton driven by the enhanced UV-B radiation will lead to the change in the structure of phytoplankton community. 相似文献
3.
In May 2007, the Marine Hydrophysical Institute of the Ukrainian National Academy of Sciences carried out an oceanographic
expedition in the northwest sector of the Black Sea. This expedition originates a series of surveys scheduled for this region.
It was realized within the framework of national and international projects, such as Climate, Ecoshelf, Stable Ecosystem, SESAM, ECOOP, and Oceanography. We present the data on the works carried out in this expedition and perform a brief analysis of the process of subduction
of waters on the northwest shelf. It is shown that, despite the abnormally warm preceding autumn–winter period, the wellpronounced
subduction of waters formed in the process of autumn–winter cooling was still observed over the drop of depth along the isopycnic
surfaces σt = 14.0 and σt = 14.5–14.6 in May 2007. New data on the intensity of vertical turbulent exchange over the continental slope in the northwest
part of the Black Sea are obtained. 相似文献
4.
The reproductive ecology of the mudskipper Boleophthalmus pectinirostris was investigated during the spawning season in the Funing Bay, Fujian, China. The fish burrows were basically Y-shaped and had two openings onto the mudflats. Part of the intersection at the center of the burrow was dilated to form a "spawning chamber". The dissolved oxygen concentrations (0.40~0.65 mg/dm3)of water 15 cm deep inside the burrows were much lower than those (5.96~6.19 mg/dm3) of intertidal pool water. Water temperatures inside the burrows were much lower than those of intertidal pools. Field investigations indicated that eggs were laid on the inner wall and ceiling of the spawning chamber by means of filamentous attachments, and a male stayed inside the burrows to guard it. Field investigations also suggested that fish of both sexes constructed mud burrows by themselves but that the spawning chamber was made only in the male burrow. The male attracted a female to his burrow for mating and spawning. There was no water in the spawning chamber, and thus the eggs were exposed to the air in the chamber. Changes in spawning readiness and gonadosomatic index indicated that synchronization of spawning was related to the semi-lunar periodicity, and this is the first report of this relationship in the mudskippers. 相似文献
5.
Adhesion of pathogenic Vibrio alginolyticus to the gill mucus of Pseudosciaena crocea 总被引:1,自引:0,他引:1
Adhesion of Vibrio alginolyticus to the gill mucus of Pseudosciaena crocea has been investigated using [methyl—3H]thymidine as isotope tracer. The results showed that: the adhesive quantity of V. alginolyticus increased with bacterial concentrations and reached equilibrium after incubated for 180 min; the higher adhesive quantity was obtained at 15~30 ℃ and sourish conditions; adhesion of V. alginolyticus could not achieved without Na , and Ca2 played an auxiliary role in the bacterial adhesion; adhesion of V. alginolyticus was inhibited remarkably by starvation, heat treatment and periodic acid treatment; all of the eight kinds of carbohydrates investigated enhanced the adhesion of V. alginolyticus to the gill mucus of P. crocea, among them, glucose, mannose, fructose and maltose showed the specially enhanced adhesion. The results indicated that V. alginolyticus could adhere to the gill mucus of P. crocea facilely in seawater, and this bacterial adhesion was influenced by environmental factors and closely related to superficial carbohydrate structures and some heat-sensitive structures. 相似文献
6.
Lobanov V. B. Sergeev A. F. Maryina E. N. Prushkovskaya I. A. Tishchenko P. Y. Kalinchuk V. V. Koltunov A. M. Makseev D. S. Sagalaev S. G. Yurikova D. A. Akulova E. A. Aparina K. A. Zagoruyko O. I. Zverev S. A. Kraynikov G. A. Kukla S. P. Leusov A. E. Lukyanova N. B. Ryumina A. A. Semkin P. Y. Shvetsova M. G. Shkirnikova E. M. Yurikova E. A. Yurtsev A. Y. Yakimov T. S. 《Oceanology》2021,61(5):742-744
Oceanology - The results of research carried out on cruise 62 of the R/V Akademik Oparin from December 14 to 29, 2020 continued monitoring of the interannual variability of the Japan Sea water... 相似文献
7.
A new species, Arietellus unisetosus n. sp, (Copepods, Calanoida, Arietellidae, Arietellus) sampled from the tropical waters of the central Pacific Ocean is described. It is easily distinguished from the other known congeneric species by the following some characters (female):the caudal rami asymmetrical, the outer margin of left ramus swollen, knob-like; leg 5:both knob-like endopods each with a long apical seta; both lobate exopods without any terminal spine, etc. 相似文献
8.
9.
The oceans have rich resources of microbes. In recent years, searching for antibiotic of new structure and special biological activity from marine microbes has received great attention. This paper reports the results of the studies on the distribution and the antibacterial properties of Streptomyces in the intertidal zone of Southern Fujian. These studies have important significance to further investigate 相似文献
10.
A study on the biology of Cultellus scalprum 总被引:1,自引:0,他引:1
Chen Pinjian 《海洋学报(英文版)》1995,14(4):569-578
A study on the biology of Cultellus scalprumChenPinjian(ReceivedJuly8,1995iacceptedOctober20,1995)Abstract:Thispaperreportsin... 相似文献
11.
In this paper, a comparison among the seven large meanders of the Kuroshio is made in order to probe into their similarity and differences. The major results are described as follows.1. Although the three phases for the seven large meanders such as their formations, maturity, as well as decline are very similar to one another, each meander has its own trivial difference in detail.2.The paths of the first six large meanders in the mature phase may be classified into ten types: U1, V1, U2, V2, U1', V1', U2', V2',φ and W.3.The seven large meanders may be grouped into two patterns, i. e. , pattern Ⅰ and pattern Ⅱ. Pattern Ⅰ includes the first and the fourth large meanders, and pattern Ⅱ includes the rest of the above meanders.4. Four standards for identifying the large meanders of the Kuroshio are put forward. 相似文献
12.
Oceanology - Cruise 83 of the R/V Akademik Mstislav Keldysh was organized by the Shirshov Institute of Oceanology in the framework of the Program “Marine Ecosystems of the Siberian... 相似文献
13.
Izvestiya, Atmospheric and Oceanic Physics - For regional earthquakes, the kinematic parameter VP/VS, an analog of the TAU parameter, was analyzed in order to study the state of magmatic matter,... 相似文献
14.
In this paper, numerical modelling of the fluctuation of the thermocline in the Bohai Sea has been made using a two-dimensional nonlinear model in stratified ocean and the model for the depth of the thermocline under the effects of wind stirring. The computed results depict the variations of the fluctuation of the thermocline driven by different kinds of wind fields. The fluctuation of the thermocline in the Bohai Sea varies somewhat with different directions, paths and locations of typhoon (cyclone). Under the effects of strong wind, the thermoclines both sink due to mixing and fluctuate. Furthermore, the fluctuation of the thermocline speeds up mixing. At last, the thermoclines disappear after 12-15 h when the strong wind increases from Force 6 to Force 9. 相似文献
15.
On the basis of the wind-energy method, we estimate the distributions of the parameters of a longshore flux of sediments formed
near the west coast of the Bakal’skaya Spit (in the northwest part of the Crimea) under the conditions of heavy storms whose
action caused a significant erosion of the west coast of the spit and retreat of the coastline in January and November 2007.
The calculations are carried out by using the actual directions and velocities of the winds recorded in the investigated region.
We analyze the trends of changes in the formation of the coastal zone caused by the nonuniform distribution of the intensity
of longshore transportation of sediments. In analyzing the causes of formation of gullies in the barrier of the Bakal’skoe
Lake and in the narrow distal part of the body of the spit, we make an attempt of interpretation of the quantities characterizing
the force of the frontal action of waves. The obtained numerical results are confirmed by the data of field observations. 相似文献
16.
From 1979 to 1989, the current Qingshuigou course of the Huanghe River formed a sub - delta which resembles a beak extending into the Laizhou Bay. It covers 618 km2 in area. To meet the needs of developing and constructing the Huanghe River Delta and under the presupposition of keeping the current course for 15-20 a, we forecast mainly by using the OM (1, 1) model that the front border of the sub-delta will be close to 119°30'E and its area will become 923 km2by the end of the year 2000. The Huanghe River will make land 760 km2 in area. 相似文献
17.
Comparison of airsea fluxes of CO2 in the Southern Ocean and the western Arctic Ocean 总被引:1,自引:0,他引:1
The data were collected during Chinese Arctic and Antarctic Expeditions in the western Arctic Ocean and the marginal sea ice zone (MSIZ) of the Southern Ocean, respectively in the boreal summer from July to September of 1999 and in the austral summer from December of 1999 to January of 2000. The concentrations of CO2 in surface water of the survey regions would mostly present lower than those in the atmosphere. A significant biological driving force could also been observed in summer waters in both of the above oceans. Air to sea CO2 fluxes were also calculated to compare oceanic uptake capacity of CO2 in both oceans with the world oceans using Liss, Wanninkhof, and Jacobs‘s methods. The averaged CO2 fluxes of air to sea in the western Arctic Ocean or in the MSIZ of the Southern Ocean doubled that in the world oceans. 相似文献
18.
The mussel (Mytilus virids Linnaeus) were cultured in seawater containing ~(60)Co, ~(137)Csand ~(60)Co plus ~(137)Cs respectively with different concentrations (10~(10)--10~(-6) Ci/ 1) for one month.Then, the loss experiments were carried on for another month. It was studied that therelation between the accumulation amount of radioactivity in every parts of mussel bodyand pollution amount of radioactivity in seawater. The results showed that ~(60)Co can be 相似文献
19.
Influence of waterlogging time on the growth of Kandelia candel(L.) Druce seedlings grown for 70 d in the artificialtidal tanks‘ simulated semidiurnal tide under greenhouse is studied. Sand and soil act as the substrate and artificial seawater with salinity of 15 is used in cultivation. Shorter waterlogging time (inundated for about 2 ~ 4 h) promotes the growth of K candel seedlings, while longer time (inundated more than 8 h) or no waterlogging (0 h) inhibits their growth. The number and length of aerating roots increase with the increase of waterlogging time. Under existing conditions, the optimal waterlogging time for the growth of K. candel seedlings is about 2 ~ 4 h in every tide cycle. Compared with other treatments, the 2 h sanded treatments obtain the highest biomass of seedlings, have the lowest mass loss ofhypocotyl and broaden the photosynthetic area by increasing the area per leaf after 70-d cultivation. And the soil treatments have the similar tendency. However, waterlogging for 8h in every tide cycle is critical for normal development of seedlings.K. candel seedlings are highly tolerant to waterlogging and a proper waterlogging is beneficial to the growth of K. candel seedlings. 相似文献
20.
- Abundance of total bacteria, heterotrophic bacteria, coliform and oil degradable bacteria and their relations with salinity and suspended matter in the frontal waters in the Hangzhou Bay are described. The results obtained show that the highest abundances of total bacteria , heterotrophic bacteria are encountered around the front and near the northern shore of the Hangzhou Bay, where a positive correlation ( r =0. 70) between the total bacteria abundance and the total suspended matter (TSM) is persent. Moreover,the abundance of oil degradable bacteria being an indicator of oil pollution, is also high in that region. 相似文献