Consumption of bacteria by larvae of a deep-sea polychaete     

Adele J. Pile  & Craig M. Young 《Marine Ecology》2006,27(1):15-19

We investigated whether trochophore larvae of the polychaete Hesiocaeca methanicola, which lives on exposed ice‐like methane hydrates between 500 and 600 m, could consume near‐bottom picoplankton. In laboratory trials larvae significantly reduced the growth rates of all types of picoplankton, including heterotrophic bacteria, Prochlorococcus sp., Synechococcus‐type cyanobacteria and phototrophic eucaryotes <3 μm. Our findings suggest that these types of plankton may be important food sources for deep‐sea planktotrophic larvae.  相似文献   

Mapping sediment acoustic impedance using remote sensing acoustic techniques in a shallow-water carbonate environment     

Donald J. Walter  Douglas N. Lambert  David C. Young  Kevin P. Stephens 《Geo-Marine Letters》1997,17(4):260-267

 Real-time trackline plots of surficial sediment acoustic impedance delineate several sedimentary facies off Garden Key in the Dry Tortugas. The sea floor within a 6×6 km surveyed area consists of carbonate muds (silts), sands and shell, rock, and live corals. The 4-kHz acoustic data supports this finding by providing a pictographic representation of the distribution and structure of several sediment facies types. Plotting the gridded acoustic data with commercial mapping software (Surfer) provides a three-dimensional (3D) perspective of the bottom topography with a color contour map of surficial sediment impedance (upper 0.4 m) draped over the 3D surface.  相似文献   

Effects of cadmium on the induction and activities of enzymes of xenobiotic metabolism in plaice     

Stephen C. George  Peter Young  Helen Morrison 《Marine environmental research》1985,17(2-4)

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Advances in Vent, Seep, Whale- and Wood-Fall Biology     

Lisa A. Levin  James P. Barry  Horst Felbeck  Craig R. Smith  & Craig M. Young 《Marine Ecology》2007,28(1):1-2

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热带气旋活动对中国夏季雨带类型与ENSO的响应关系   总被引：2，自引：0，他引：2  

陈文玉  陈菊英 《海洋预报》1997,14(1):25-36

本文分析研究了热带气旋１）活动与中国夏季２）３组（包括８种）主要多雨带类型的响应关系。同时对热带气旋活动与夏季大陆气温和ＥＮＳＯ事件的始终时间的响应关系，也进行了探讨。分析表明，夏季中国的雨带分布特征对热带气旋活动有着十分重要的指示意义。热带气旋活动与中国大陆气温有着正相关关系，与ＥＮＳＯ事件的发生有着反相关关系  相似文献   

上海石化总厂化工物料码头对附近水下地形变化的影响     

劳治声  陈全 《海洋湖沼通报》1993,(2):31-39

分析了上海石化总厂化工物料码头周围水下地形工程前后的变化。指出在淤泥质岸段,由于沿岸工程的影响,造成工程附近水域动力环境的改变,水下地形随之作出相应的调整。特别在淤泥质岸段附近流急、含沙量高的水域中构筑沿岸工程,工程的水流下方一侧,水流减缓,水流挟沙能力大大减弱,出现明显的局部淤浅地形,为提高工程效益,对各工程之间的相互影响,应予以重视。  相似文献   

Frequency-selective attenuation of sound propagation and reverberation in shallow water     

Qiu Xinfang  Zhang Renhe  Li Wenhu  Zhu Baixian  Jin Guoliang 《海洋学报(英文版)》1997,16(4):475-490

Ｆｒｅｑｕｅｎｃｙ－ｓｅｌｅｃｔｉｖｅ　ａｔｔｅｎｕａｔｉｏｎ　ｏｆ　ｓｏｕｎｄ　ｐｒｏｐａｇａｉｏｎ　ａｎｄ　ｒｅｖｅｒｂｅｒａｔｉｏｎ　ｉｎ　ｓｈａｌｌｏｗ　ｗａｔｅｒTXＦｒｅｑｕｅｎｃｙ－ｓｅｌｅｃｔｉｖｅａｔｔｅｎｕａｔｉｏｎｏｆｓｏｕｎｄｐ...  相似文献   

Evaluation of bending moments and shear forces at unit connections of very large floating structures using hydroelastic and rigid body analyses   总被引：1，自引：0，他引：1  

Byoung Wan Kim  Sa Young Hong  Jo Hyun Kyoung  Seok Kyu Cho 《Ocean Engineering》2007,34(11-12):1668-1679

This paper investigates the characteristics of bending moments, shear forces and stresses at unit connections of very large floating structures (VLFS) under wave loads. The responses of VLFS are calculated by solving multi-body motion equation considering hydroelasticity and connection stiffness. Hydroelastic responses are calculated by the direct method. Higher-order boundary element method (HOBEM) is used for fluid analysis and finite element method (FEM) is introduced for structural analysis. The equation of motion is modified to describe the unit connections by employing spring elements. Bending moments and shear forces at the connections are obtained from the dynamic equilibrium condition for pressures and inertia forces. Two types of VLFS units such as tandem arranged units and side-by-side arranged units are considered in the numerical examples. The influences of connection stiffness, wave frequency and heading angle on responses of VLFS are investigated through the numerical examples. Rigid body analysis along with hydroelastic analysis is also carried out in the numerical analysis and comparison of those two approaches is discussed.  相似文献   

Effects of an Artificial Breakwater on the Distributions of Planktonic Microbial Communities     

Young-Ok Kim  Eun Jin Yang  Jung-Hoon Kang  Kyoungsoon Shin  Man Chang  Cheol Soo Myung 《Ocean Science Journal》2007,42(1):9-17

The summer distributions of planktonic microbial communities (heterotrophic and phtosynthetic bacteria, phtosynthetic and heterotrophic nanoflagellates, ciliate plankton, and microphytoplankton) were compared between inner and outer areas of Lake Sihwa, divided by an artificial breakwater, located on the western coast of Korea, in September 2003. The semienclosed, inner area was characterized by hyposaline surface water (<17 psu), and by low concentrations of dissolved oxygen (avg. 0.4 mg L¹) and high concentrations of inorganic nutrients (nitrogenous nutrients >36 μM, phosphate <4 μM) in the bottom layer. Higher densities of heterotrophic bacteria and nanoflagellates also occurred in the inner area than did in the outer area, while microphytoplankton (mainly diatoms) occurred abundantly in the outer area. A tiny tintinnid ciliate, Tintinnopsis nana, bloomed into more than 10⁶ cells L¹ at the surface layer of the inner area, while its abundance was much lower (10³-10⁴ cells L¹) in the outer area of the breakwater. Ciliate abundance was highly correlated with heterotrophic bacteria (r = 0.886, p < 0.001) and heterotrophic flagellates (r = 0.962, p < 0.001), indicating that rich food availability may have led to theT. nana bloom. These results suggest that the breakwater causes the eutrophic environment in artificial lakes with limited flushing of enriched water and develops into abundant bacteria, nanoflagellates, and ciliates.  相似文献   

Strength Analysis of Turret Mooring Productive/Storage Tanker     

Zhang Shilian Jin Dexian Associate Professor 《中国海洋工程》1997,(3)

The longitudinal strength of turret mooring productive/storage tanker is studied.A numeri-cal example has been implemented according to the method presented in this paper to give practical il-lustration.From the results of the numerical example,it is concluded that the turret hole located near theforward of the amidships has small effect on the longitudinal strength of the ship hull.As for design ex-treme value of wave bending moment of storage tanker,statistic method is a more reasonablemethodology,especially with the consideration of the servere environmental conditions.The primary esti-mation of design section modulus of turret storage tanker can be determined by this design bending mo-ment.  相似文献