Annual Cycle of Zooplankton Biomass, Abundance and Species Composition in the Neritic Area of the Balearic Sea, Western Mediterranean   总被引：7，自引：0，他引：7  

MªLuz Fernández de  Puelles  David Grás  & Santiago Hernández-León 《Marine Ecology》2003,24(2):123-139

Abstract. Seasonal changes in zooplankton biomass, abundance and species composition were studied at a neritic station in the Balearic Sea between April 1993 and May 1994. Sampling was carried out every 10 days in a zone influenced by the main current circulating through the Mallorca channel. Three main peaks of zooplankton biomass and abundance were observed: (1) at the beginning of summer when the thermocline developed, (2) in autumn when the thermocline broke down, and (3) in early spring. The smaller zooplankton fraction (100–250 μm) comprised on average 32 % of the total biomass and 73 % of total abundance. Copepods were the predominant group (64 % of the total abundance) with Clausocalanus, Oithona and Paracalanus being the most abundant genera. Paracalanus parvus, Clausocalanus furcatus, Acartia clausi, Oithona plumifera, Temora stylifera, Centropages typicus and Oncaea mediterranea were found to be the most important species in the area. Other abundant groups were cladocerans (15 %) and meroplankton larvae (12 %), both of which were particularly numerous during the stratified period. The copepod community was characterized by the above‐cited perennial species, which were abundant during the cycle studied. However, the influence of the hydrological conditions of the Balearic Sea, such as the Atlantic water influx and the physical structure of the water column (stratification and mixing), promoted the observed variability in zooplankton as well as the appearance of characteristic species during the annual cycle.  相似文献   

Recent changes in the winter distribution and movements of northern Atlantic cod (Gadus morhua Linnaeus, 1758) on the Newfoundland-Labrador Shelf     

Kulka  David W.; Wroblewski  J. S.; Narayanan  Savi 《ICES Journal of Marine Science》1995,52(6):889-902

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Seasonal Variation in the Biomass of Marine Macrophyta from Greek Coasts     

S. Haritonidis    G. Nikolaidis  I. Tsekos 《Marine Ecology》1986,7(4):359-370

Abstract. The marine plant communities of the littoral zone in different biotopes of the Greek coasts were investigated in 1980-81. Seasonal distribution and variation of marine plant biomass were assessed. The communities of Cystoseira crinita and C. compressa were outstanding with maximum biomass during the summer months. Corallina officinalis and Pterocladia capillacea + Viva rigida communities predominated with maximum biomass in autumn and exhibited a decrease in winter, except in stressed biotopes. The species diversity and productivity of seaweeds along the Greek coasts are interpreted in relation to a number of environmental parameters.  相似文献   

Protracted Environmental Issues on a Proposed Titanium Minerals Development in Kenya's South Coast     

J. O. Z. Abuodha  P. O. Hayombe 《Marine Georesources & Geotechnology》2006,24(2):63-75

This study takes cognizance of the fact that the TIOMIN (TIOMIN Resources Inc. of Canada) project has resulted in controversy over its handling of environmental issues and especially the Environmental Impact Assessment (EIA). The authors address many of the protracted issues that have slowed the development of the mining project in Kwale. The main emphasis is on the impacts of the mining and mineral separation processes on the environment, including the governing legislation, the role of consultation and public participation, and socioeconomic issues. In their public documents TIOMIN has specified neither the type of minerals it wants to extract from the area nor their chemical composition. It is well known, however that the titanium minerals and zircon targeted have impurities of iron, thorium and uranium. In the absence of an Environmental Management Plan, the effects of stockpiling radioactive wastes and other impurities that could possibly lead to environmental degradation in both the terrestrial and marine environments have not been publically addressed. The measures proposed to mitigate ecological damage as a result of the establishment of a minerals processing plant in the area seem inadequate. Pollution resulting from accidental spillage or breakage could have significant impact on marine life and residents living near the mining site. Other issues that have not been addressed satisfactorily pertain to the use of surface and underground water. The area already faces a huge water deficit and the calculations presented on aquifer recharge and stream flow rates do not indicate the large quantities of water that would be required in the mineral processing plant. The project, if approved in its present state, risks violation of international conventions. Furthermore, it could cause a conflict between Kenya and Tanzania in the event of an oil spill at the proposed ship loading facility at Shimoni. The proposed mining area includes the district's most fertile land, is home to many fisherfolk and is a major tourist destination. An analysis of the effects of this project on other available opportunities must be thoroughly understood to ascertain the economic and environmental benefits and costs of the mining venture. The proposed compensation rate of $1,000 per acre, for resettlement for example, appears to be grossly inadequate. Compensation should take into account family size and structure family assets and the cost of relocation.  相似文献   

Persistent volcanic signature observed around Barren Island, Andaman Sea, India     

C. M. Laluraj  K. K. Balachandran  P. Sabu  S. U. Panampunnayil 《Marine Geophysical Researches》2006,27(4):283-288

This study delineates the formation of a warm pool (>34°C) of air to the west (downwind) of the active volcano of the Barren Island during October–November 2005. Barren Island is located in the Sumatra–Andaman region, about 135 km east of Port Blair, and lies within the Burma microplate, the southern tip of which experienced a submarine earthquake (M _w 9.3) causing a tsunami in December 2004. Barren Island is the only volcano, which has shown sustained eruptive activity since shortly after the Great Sumatran Earthquake of December 2004. Our observations require further corroboration to relate how submarine earthquakes activate volcanoes and how far these thermal emissions influence climate changes. Because it links global warming and climate changes to the frequent emissions from a volcano activated by submarine earthquakes, this case study is of special interest to the earth-ocean-atmosphere sciences community.  相似文献   

台湾海峡毛颚动物分布的初步研究   总被引：9，自引：0，他引：9  

蒋玫  王云龙  徐兆礼 《台湾海峡》2003,22(2):150-154

本文分析了台湾海峡毛颚动物的种类组成、数量分布特征，并就其与环境因素的关系进行了初步探讨．结果显示与台湾海峡西部、东海等邻近海域相比，本区毛颚动物具种数少，数量小，季节变化幅度较小等特点．它的数量分布状况与闽斯沿岸流、南海西南季风漂流以及黑潮支流在本区运动消长有关。  相似文献   

涠洲岛珊瑚礁生态系中浮游动植物与环境因子关系的初步探讨   总被引：2，自引：0，他引：2  

韦蔓新  黎广钊  何本茂  梁文 《海洋湖沼通报》2005,(2):34-39

本文根据1990年4月、10月间的理化分析数据，结合2002年9月涠洲岛珊瑚礁生态环境的调查状况，首次从珊瑚礁生态系的角度初步探讨该岛区浮游动植物与环境因子的关系。结果表明：该岛区浮游动植物的分布具有明显的区域性和季节性，既体现了珊瑚礁生态系具有较高的初级生产力特征，也体现了浮游动植物具有显著的季节交替现象。相关分析显示，水温、盐度、N，P，Si营养盐对浮游植物的种类组成及数量变动均有明显影响，但对浮游动物的影响不大；N是该生态系中浮游植物的限制因子，P限制状况只有在珊瑚礁生长带较深的海域出现，Si呈相对富足状态。  相似文献   

泉州湾海域表层沉积物矿物碎屑分布特征及其环境意义   总被引：4，自引：0，他引：4  

谷东起  边淑华  胡泽建  张绪良 《海岸工程》2003,22(2):22-30

对泉州湾13个表层沉积物样品进行了矿物碎屑定量分析．通过矿物分析，发现泉州湾不同站位的轻、重矿物组分、含量和表征存在差异．根据矿物的分布和组合特征．将耒州湾划分为4个组合区，不同组合区所处沉积环境是不同的．分析表明，研完区表层沉积物的碎屑矿物具有明显的亲陆性，物质来源主要为河流输砂和沿湾海岸侵蚀来砂，且其分布受物源、水动力条件和矿物物理性质等因素所控制。  相似文献   

两项新技术及其在海水苗种生产中的应用   总被引：4，自引：0，他引：4  

杜守恩 《海洋湖沼通报》1995,(3):59-62

本文介绍了两项新技术，用泡沫净化空气、海水和生物效应灯，及其在海水苗种生产中的应用。文中分别讨论了它们的原理、设计安装及使用效果。希望这两项新技术能够得到推广，以提高出苗率，增加海水苗种生产的经济效益。  相似文献   

Using benthic macrofauna to assess environmental quality of four intertidal mudflats in Hong Kong and Shenzhen Coast   总被引：4，自引：0，他引：4  

Cai Lizhe  Nora F. Y. Tam  Teresa W. Y. Wong  Ma Li  Gao Yang  Yuk-Shan Wong 《海洋学报(英文版)》2003,22(2):309-319

Abstract-Intertidal zone is a significant wetland between land and ocean. It plays an important rolein maintaining local ecological balance. Both Mai Po and Futian intertidal mudflats are located in Shen-zhen Bay and are important "refueling" point along the East Asian/Australian flyway of migratory birds.The environmental quality of Mai Po and Futian mudflats have aroused great concern due to rapid eco-nomic developments in Hong Kong and Shenzhen in recent decades. Microinfauna of Mai Po and Futianmudflats was investigated in December 2000 and the faunal data were used to assess their environmentalquality. Two other mudflats, namely Ma Wan Typhoon Shelter (a more disturbed area) and Luk Kengintertidal mudflat (a place with relatively less human disturbance), were also sampled for macroinfaunaand used as reference mudflats. Shannon-Weaver species diversity index (I_(sd)), biotic coefficient (C_b)and macrofaunal pollution index (I_(mp)) of the macrofauna community on four intertidal mudflats wereused to  相似文献