台湾海峡蓝圆鲹的食性研究   总被引：2，自引：0，他引：2  

黄美珍 《台湾海峡》1995,(4)

本文材料系1965年，1977年，1988年至1989年台湾海峡灯光围网、拖山网的渔获物。采用个体百分比（N），重量百分比（W），出现频率（F），出现频率百分比，胃饱满系数，类群更替率等指标进行分析，并根据3个指标，计算了相对重要性指标。蓝圆鲹食性广泛，主要食料有桡足矣、小型鱼类、糠虾类、长尾类和短尾类等。幼鱼食料以桡足类最为重要，成鱼食料则以鱼类为重要。蓝圆鲹摄食强度有明显的季节变化。周年摄食强度呈双峰型，高峰期正好比两个产卵期迟1个月，说明蓝图鲹生殖后强烈摄食。幼鱼摄食强度昼夜变化明显，以黄昏和黎明摄食较强烈。蓝图鲹主要饵料生物的高生物量区，可作为寻找中心渔场的良好生物学指标之一，这在生产实践中有重要意义。  相似文献   

海洋沉积样品~(14)C测年差异来源及其结果解释     

苗兰庆  冯炎基  黄卫平 《热带海洋学报》1991,(2)

~(14)C测年已为海洋研究工作广泛应用,但由于时有不合理取样或在运用数据时没有充分考虑各种海洋环境和动力因素,因而产生无法使用数据作合理解释的现象。本文试从海洋样品本身和海洋各种营力作用分析各种数据差异的来源,认为海洋环境特别是海岸带环境的复杂性是造成海洋样品~(14)C测年数据差异的主要原因,它可能影响样品的代表性或使数据解释时得出错误结论.并指出在运用年代结果时一定要充分考虑地质地理和各种营力作用因素。  相似文献   

福建罗源湾海滩互花米草盐沼中18种金属元素的分布   总被引：13，自引：0，他引：13  

钦佩  谢民  仲崇信 《海洋科学》1989,13(6):23-27

本文对福建罗源湾可湖海滩互花米草盐沼中的18种金属进行了测试,结果表明,罗源湾可湖海滩的环境质量基本是好的,并探讨了开发利用互花米草的新途径。  相似文献   

云贵高原湖泊沉积物─水界面碱度扩散通量研究   总被引：4，自引：0，他引：4  

吴丰昌  万国江  黄荣贵 《海洋与湖沼》1997,28(1):66-71

于１９９１－１９９５年间５次在云贵高原泸沽湖，洱海湖和贵州阿哈湖，百花湖的湖心采集沉积物柱芯，界面水和湖水样品，通过其ｐＨ值和ＨＣＯ３浓度剖面及界面碱度扩散通量的研究，首次定量评估高原湖泊界面扩散作用上不体碱度的影响程度，研究结果表明，云贵高原某些湖水寄宿时间对较长，湖水深度相对小的湖泊，界面扩散作用是水体碱度的重要来源之一，湖水寄宿时间较短，深度较小的湖泊，界面扩散对上覆水体的影响可以忽略不地。  相似文献   

The influence of hydrography on the distribution of phytoplankton in the southern Taiwan Strait     

R. Huang 《Estuarine, Coastal and Shelf Science》1988,26(6)

During the period August 1985 to May 1986, phytoplankton in the southern Taiwan Strait was collected and studied for distributional variability in relation to hydrography. The results indicated that maximum standing crops of phytoplankton occurred in October and May due to the outgrowth of certain species of diatoms and blue-green algae. The majority of phytoplankton appeared in the water in the top 25 m and occurred in distinct clusters under the influence of water movement. Multivariate analysis indicated that hydrographic parameters, which accounted for the variability of phytoplankton distribution, varied seasonally. Vertical, spatial and temporal variabilities were also apparent. The close relationship between hydrography and algal distribution justifies the use of variations in the phytoplankton population as a useful tracer of water movement.  相似文献   

大深度触底指示器Pinger换能器及其声反射系统     

王清池  许肖梅  许鹭芬  黄锡明 《海洋科学》1997,21(6):61-63

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The impact of several chemical poisons on the absorbing ⁴⁵Ca by the Arca granosa     

Cai Fulong  Chen Ying  Huang Lingyi 《海洋学报(英文版)》1992,11(3):435-440

The impact of several chemical poisons on the Arca granosa absorbing 45Ca was studied. The results showed that the absorption of 45Ca in the blood and the soft tissue by Arca granosa was inhibited by the inorganic compounds of Cu, Zn, Pd, Cd, Hg and so on, among which the inhibition of Cd was the strongest, next was that of Cu and Hg. But the inhibition of the absorption of 45Ca in the shell of Arca granosa was little. The impact of three kinds of energy metabolism inhibitory substances on the absorption of 45Ca by the Area granosa showed that the absorption was an active transfer process.  相似文献   

三峡工程对河口及邻近海域渔业影响的初步探讨     

罗秉征  薛频  卢继武  黄颂芳 《海洋科学集刊》1992,(33):341-352

河口只是河流与海洋之间的一小部分水域,但对人类社会的发展和生物的进化起着重要的作用。它不仅是生物种群繁殖、育幼和栖息的场所,而且是溯河和降海鱼类洄游的必经之路,因此,河口对生物种群的繁衍延续和资源补充,以及保持生态平衡具有十分重要的意义。 然而,河口又是生态环境十分脆弱和敏感的水域,同时也是受人类干扰最为严重的区域。因此,河口的生态环境问题愈来愈引起人们的关注,其中包括长江三峡水库的兴建对长江口及其附近海域生态、环境的影响,特别是对位于河口两侧的我国著名两大渔场——舟山渔场和吕四渔场的影响问题。影响渔业资源的因子是多方面而且错综复杂的。本文主要通过长江径流的变化与环境因子变量的相关分析,并根据三峡水库不同蓄水方案,对河口近海渔业的影响问题进行初步探讨。  相似文献   

The Rossby wave as a key mechanism of Indian Ocean climate variability     

Mark R. Jury  Bohua Huang 《Deep Sea Research Part I: Oceanographic Research Papers》2004,51(12):2123-2136

We analyze the time-longitude structure of composite cases from model-assimilated ocean data in the period 1958–1998, following on from earlier work by Huang and Kinter (J. Geophys. Res. 107(C11) (2002) 3199) that studied east–west thermocline variability in the Indian Ocean. Our analysis focuses on the Rossby wave signal along the thermocline ridge in the tropical SW Indian Ocean (10°S, 60–80°E), where wind stress curl is important. Anomalous winds in the equatorial east Indian Ocean force successive Rossby waves westward at speeds of 0.1 m s⁻¹±30%. With a wavelength of 7000 km, the period of oscillation is in the range 1.9–5.2 years. The Indian Ocean Rossby wave is partially resonant with the global influence of the El Nino–Southern Oscillation, except during quasi-biennial rhythm. The presence of the Rossby wave offers potential predictability for east–west atmospheric circulation systems and climate that affect resources in countries surrounding the Indian Ocean.  相似文献   

Practical implementation of Hilbert-Huang Transform algorithm   总被引：12，自引：0，他引：12  

Huang Daji  Zhao Jinping  Su Jilan 《海洋学报(英文版)》2003,22(1):1-14

Hilbert-Huang Transform (HHT) is a newly developed powerful method for nonlinear and non-stationary time series analysis. The empirical mode decomposition is the key part of HHT, while its algorithm was protected by NASA as a US patent, which limits the wide application among the scientific community. Two approaches, mirror periodic and extrema extending methods, have been developed for handling the end effects of empirical mode decomposition. The implementation of the HHT is realized in detail to widen the application. The detailed comparison of the results from two methods with that from Huang et al. (1998, 1999), and the comparison between two methods are presented. Generally, both methods reproduce faithful results as those of Huang et al. For mirror periodic method (MPM), the data are extended once forever. Ideally, it is a way for handling the end effects of the HHT, especially for the signal that has symmetric waveform. The extrema extending method (EEM) behaves as good as MPM, and it is better t  相似文献