5种海鱼的生态生长效率研究   总被引：12，自引：0，他引：12  

李军  杨纪明  庞鸿艳 《海洋科学》1995,19(3):52-54

在常温下进行星鳗、蛹、黑鳗、厚头平Ｙｏｕ和皱唇鲨等五种鱼类的生长实验，得出这５种鱼类摄食巢沙蚕、火枪乌贼、斑Ｊｉ（碎块）、带鱼（碎块）和玉筋鱼的生态生长效率波动于３．８￣３３．６％范围内，平均为１６．０％，相对平均日摄食量处于１．６￣１１．５％之间，另外，对饵料系数、平均日摄食量及平均体重日增长量进行了探讨。  相似文献   

Regional variability in the trophic requirements of shelf sea fisheries in the Northeast Atlantic, 1973-2000     

Heath  Michael R. 《ICES Journal of Marine Science》2005,62(7):1233-1244

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Changes in the structure and function of the North Sea fish foodweb, 1973-2000, and the impacts of fishing and climate   总被引：1，自引：0，他引：1  

Heath  Michael R. 《ICES Journal of Marine Science》2005,62(5):847-868

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长江口及其附近海域细菌和三磷酸腺苷的分布特征   总被引：8，自引：0，他引：8  

史君贤  陈忠元  宁修仁  C.Courties  M.N.Hermin 《海洋与湖沼》1992,23(3):288-296

于1986年1月和7月在长江口及其附近海域进行了细菌的落射荧光直接计数和三磷酸腺苷(ATP)浓度的测定,同时取分样进行了微生物呼吸作用耗氧速率和叶绿素浓度的测定。结果表明,细菌数量和ATP浓度夏季较冬季高,总的分布趋势是,高值区出现在内河段和长江口,向外海逐渐降低;细菌数同悬浮体浓度、硝酸盐浓度和耗氧速率呈正相关,与盐度呈负相关。冬季,在整个海域细菌是ATP的主要贡献者和溶解氧的主要消耗者;夏季,沿冲淡水方向ATP出现两个峰值,第一峰值出现在长江口的最大浊度带,由细菌所贡献;第二个出现在盐度25—30的区域,由浮游植物所贡献。呼吸作用耗氧速率也呈现了与ATP相似的分布特征。  相似文献   

Predation rates by North Sea cod (Gadus morhua) - predictions from models on gastric evacuation and bioenergetics     

Hansson  S.; Rudstam  L. G.; Kitchell  J. F.; Peppard  P. E.; Hilden  M.; Johnson  B. L. 《ICES Journal of Marine Science》1996,53(1):107-114

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近四十年南四湖水文要素变化趋势     

郑召平  王凤鸣 《海洋湖沼通报》1994,(4):16-23

利用实测降水量，水位和计算出的入湖水量，可利用水量、年用水量等资料，分析南四湖近四十年中水文要素的变化趋势，并用倾向率作定量描述，结果表明：南四湖流域降水量，湖内水位，入湖水量，可利用水量等均呈下降趋势，而年用水量却呈增长趋势，年用水量已超过兴利库容，因此，应采取措施解决南四湖的缺水问题。  相似文献   

Biogeochemistry of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in the surface microlayer and subsurface water of the western North Atlantic during spring   总被引：6，自引：0，他引：6  

Gui-Peng Yang  Maurice Levasseur  Sonia Michaud  Michael Scarratt 《Marine Chemistry》2005,96(3-4):315-329

Sixteen surface microlayer samples and corresponding subsurface water samples were collected in the western North Atlantic during April–May 2003 to study the distribution and cycling of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) and the factors influencing them. In the surface microlayer, high concentrations of DMS appeared mostly in the samples containing high levels of chlorophyll a, and a significant correlation was found between DMS and chlorophyll a concentrations. In addition, microlayer DMS concentrations were correlated with microlayer DMSPd (dissolved) concentrations. DMSPd was found to be enriched in the microlayer with an average enrichment factor (EF) of 5.19. However, no microlayer enrichment of DMS was found for most samples collected. Interestingly, the DMS production rates in the microlayer were much higher than those in the subsurface water. Enhanced DMS production in the microlayer was likely due to the higher concentrations of DMSPd in the microlayer. A consistent pattern was observed in this study in which the concentrations of DMS, DMSPd, DMSPp (particulate) and chlorophyll a in the microlayer were closely related to their corresponding subsurface water concentrations, suggesting that these constituents in the microlayer were directly dependent on the transport from the bulk liquid below. Enhanced DMS production in the microlayer further reinforces the conclusion that the surface microlayer has greater biological activity relative to the underlying water.  相似文献   

海床基自动监测系统中央控制单元设计与实验     

张毅  孙思萍  齐尔麦  常延年 《海洋技术学报》2007,26(4):1-3

根据海洋监测仪器及系统工作环境的特点,需要从高可靠性、低功耗、长时间工作、小体积、轻重量等几个方面进行深入分析和研究。论文设计的海床基自动监测系统的中央控制单元,采用工业MSP430、带中断输出的时钟芯片DS1305、FLASH RAM和低阈值VMOS功率管等低功耗3.3 V器件,应用中断和休眠软件设计方法,很好地满足了使用要求。通过实验和分析,指出了低功耗海洋监测仪器及系统设计的基本原则,总结了MSP430闲置的管脚处理、上拉电阻阻值合理选择和电池自放电电流等问题的解决方案和应用经验。  相似文献   

Diel feeding, daily food consumption and the predatory impact of whitemouth croaker (Micropogonias furnieri) in an estuarine environment     

Gisela Mandali de  Figueiredo & João Paes Vieira 《Marine Ecology》2005,26(2):130-139

Diel feeding pattern and food consumption of whitemouth croaker (Micropogonias furnieri) were examined and related to seasonal variations in an estuarine environment. To determine diel feeding pattern whitemouth croaker were collected from the Patos Lagoon Estuary over 24 h (～3‐h intervals) and their stomach contents were examined. Food consumption of whitemouth croaker was determined from evacuation rates estimated experimentally and in the field. The results suggested that whitemouth croaker in the Patos Lagoon estuary feed all day long. However, whitemouth croaker showed higher feeding intensity and food consumption during daylight hours when the water transparency increased than in others when water transparency was low. Thus, whitemouth croaker seemed to intensify their feeding when they could see their prey. Daily food consumption was between 0.9 and 5.3% of body wet weight (these being the lowest and highest consumption rates during the winter and summer, respectively). The maximum predation impact of whitemouth croaker on their preferential prey, the tanaid Kalliapseudes schubartii, was 27indiv·m^?2·day^?1. The results suggested that the changes in water transparency seem to affect the diel feeding pattern and food consumption of whitemouth croaker. This could have important consequences for fish growth.  相似文献   

黄河流域化学风化作用与大气CO2的消耗   总被引：24，自引：0，他引：24  

李晶莹  张经 《海洋地质与第四纪地质》2003,23(2):43-49

通过对黄河水化学的相关分析和因子分析,得到大气CO2、碳酸盐、蒸发盐、硅酸盐风化过程对黄河水溶解质的贡献率分别为9.78%、37.3%、37.6%和7.54%,表明黄河流域碳酸盐和蒸发盐的溶解是最主要的风化过程,对河水化学的总贡献率达到74.9%.黄河水中约90%的HCO3-来自碳酸盐风化过程,10%来自硅酸盐化学风化.由此对流域现代风化率和大气CO2消耗量进行了估算,得到黄河流域化学风化率和CO2消耗率分别为33.6 t/km2*a和143.85×103 mol/km2*a,其中碳酸盐和硅酸盐风化过程消耗的CO2分别为117.70×103 和26.15×103 mol/km2,黄河流域每年消耗的大气CO2总量达到108×109 mol.与世界流域盆地年均消耗CO2量相比,虽然黄河流域的化学风化率属世界平均水平,但黄河流域风化作用的CO2消耗率却比世界平均值低约41%,这是因为黄河流域是世界上蒸发盐含量最高的地区之一,流域蒸发盐、碳酸盐风化作用占主导地位,而硅酸盐风化作用很微弱.  相似文献