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广盐性    
相关语句
  euryhaline
    In the CO_2 source area, phytoplankton abundance was low and zooplankton mainly belonged to true estuary and estuary marine communities; while in the CO_2 sink area, phytoplankton was high and zooplankton mainly belonged to euryhaline marine communities.
    二氧化碳源区,浮游植物的丰度低,浮游动物主要是纯河口类群和河口性海洋类群,而汇区,浮游植物的丰度高,浮游动物主要是广盐性海洋类群。
短句来源
    Data from ship-board incubation experiments carried out in 2003 showed that Synechococcus and picoeukaryotes were more euryhaline and more adaptable to mutive environments (e.g. mixing of water masses) than Prochlorococcus.
    2003年航次现场培养实验的结果表明,聚球藻和微微型真核浮游植物的广盐性比原绿球藻强,且对比较动荡的环境(例如水团混合)的适应性也更强些。
短句来源
    The lenticular Reichelina is widely distributed and may be planton, euryhaline organisms preserved in the different lithologic units.
    凸镜形的Reichelina分布很广,可以保存在各种沉积环境中,它可能是广盐性的浮游生物。
短句来源
    The relatively deep species of foraminifers and ostracods mainly appear in the fine-grained sediments, but euryhaline littoral, shallow water and cold water species of foraminifers and continental, euryhaline and brackish water and shallow water species of ostracods are only found in the normal grading layer.
    有孔虫和介形虫的深水种主要出现在细粒沉积层中,而有孔虫的广盐性滨岸种、浅水种和冷水种以及介形虫的陆相种、广盐性和半咸水种、浅水种等基本上只在正粒序沉积层中出现,且大都表现出从底向上数量递减的趋势。
短句来源
    All kinds of organisms belonged to euryhaline organisms.
    所有生物都属于广盐性生物.
短句来源
  euryhaline
    In the CO_2 source area, phytoplankton abundance was low and zooplankton mainly belonged to true estuary and estuary marine communities; while in the CO_2 sink area, phytoplankton was high and zooplankton mainly belonged to euryhaline marine communities.
    二氧化碳源区,浮游植物的丰度低,浮游动物主要是纯河口类群和河口性海洋类群,而汇区,浮游植物的丰度高,浮游动物主要是广盐性海洋类群。
短句来源
    Data from ship-board incubation experiments carried out in 2003 showed that Synechococcus and picoeukaryotes were more euryhaline and more adaptable to mutive environments (e.g. mixing of water masses) than Prochlorococcus.
    2003年航次现场培养实验的结果表明,聚球藻和微微型真核浮游植物的广盐性比原绿球藻强,且对比较动荡的环境(例如水团混合)的适应性也更强些。
短句来源
    The lenticular Reichelina is widely distributed and may be planton, euryhaline organisms preserved in the different lithologic units.
    凸镜形的Reichelina分布很广,可以保存在各种沉积环境中,它可能是广盐性的浮游生物。
短句来源
    The relatively deep species of foraminifers and ostracods mainly appear in the fine-grained sediments, but euryhaline littoral, shallow water and cold water species of foraminifers and continental, euryhaline and brackish water and shallow water species of ostracods are only found in the normal grading layer.
    有孔虫和介形虫的深水种主要出现在细粒沉积层中,而有孔虫的广盐性滨岸种、浅水种和冷水种以及介形虫的陆相种、广盐性和半咸水种、浅水种等基本上只在正粒序沉积层中出现,且大都表现出从底向上数量递减的趋势。
短句来源
    All kinds of organisms belonged to euryhaline organisms.
    所有生物都属于广盐性生物.
短句来源
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Rotifers are the superior foods for the larvae and juveniles of some fishes and aquatic invertebrates. Therefore, the fundamental studies of ecological conditions and culture techniques of rotifers are undoubtedly important. In order to rear the larvae and juveniles of prawns and fish, we had studied the reproductive conditions and mass-culture techniques of the rotifer, Brachionus plicatilis in the years 1964 and 1965. Results of these experiments were as follows. This rotifer is a brackish water species, however,...

Rotifers are the superior foods for the larvae and juveniles of some fishes and aquatic invertebrates. Therefore, the fundamental studies of ecological conditions and culture techniques of rotifers are undoubtedly important. In order to rear the larvae and juveniles of prawns and fish, we had studied the reproductive conditions and mass-culture techniques of the rotifer, Brachionus plicatilis in the years 1964 and 1965. Results of these experiments were as follows. This rotifer is a brackish water species, however, it is truely an euryhaline organism. It was observed that they can reproduce and grow in the salinity range of 2-50‰, but the more suitable range was 10-30%) and the optiomum range was 15—25‰. The resting eggs laid by rotifers hatched in the salinity range 1.5-35‰ and the optimum salinity range for hatching was 15-20‰. The highest hatchability observed in the present experiments was 10.47%. In the temperature range of 5-35℃ the resting eggs hatched, but the duration of hatching period varied greatly with temperatures. The optimum temperature for hatching ranged from 20° to 25℃, and in this temperature range, hatching period was shorter and the hatchability higher. In the suitable temperature range it is more advantageous for hatching to vary the temperature than to keep it constant. The highest hatchability observed in these experiments was 17.53%. This species of rotifer can reproduce and grow in the range of temperature 5-40℃, but higher temperature increases its reproduction rate and lower temperature markedly decreases it. The more suitable temperature for reproduction was in the range of 25-40℃, while at temperature 30-35℃ the reproduction rate was the fastest. When the temperature of rotifer culture is above 30℃, the body-size of rotifers markedly became smaller and this variation of bodysize is reversible. The experiments showed that diatom Nitzschia closterium forma minutissma and green algae Platymonas subcordiformis, Chlorella sp. and Chlamydomonas sp. all were excellent algae foods for this species, and yet, from the view-point of mass-culture, the green algae Ptatymonas was better than the others for the rotifers. The suitable density of dietary algae as rotifer's food were estimated as: Platymonas 1-15×10~4 cells/ml, and Nitzschia 5-100×10~4 cells/ml, mhile the most suitable density of the Platymonas was estimated as about 2.5-5×10~4 cells/ml or the Nitzschia as about 50×10~4 cells/ml. Experimental results showed that when the concentration of rotifer in the culture media is low, the reproduction rate will be high, or otherwise, when the concentration of rotifers is high, the reproduction rate will be low. In consideration of the relationship between the rate of reproduction and the number of individuals produced, it is suitable to keep the concentration of rotifers in the culture media at a level of about 1,000 individuals per liter medium. When the condition of food supply changed suddenly, either being superfluous or very lacking, sexual reproduction would take place and resting eggs would be laid. This characteristic of reproduction may be used in rotifer culture. By stopping food supply suddenly, resting eggs can be collected within 2-3 days generally. The experiments of mass-culture of rotifer had been performed in big glass-jars, aquariums, cement tanks and earth ponds, and all of these were successful. The most critical problem in mass-culture of rotifers is the condition of food supply. For fast reproduction and growth of rotifers, it is necessary to maintain the concentration of dietary algae at a suitable level throughout the whole culture process. In the experiments of mass-culture we found that a better effect might be obtained by adding 2-5% human urine by volume to the culture medium of dietary algae. In the culture experiments of rotifers, the highest density reached a number of 324,000 individuals of living rotifers per liter medium. In the detritus on the bottoms of culture vessels, the number of living rotifers reached a highest level of 1,400,000 individuals per liter and they became much smaller in their body-size under this case than that under normal conditions. when the food algae are cultured with rotifers in a high density in a same tank or pond, it is necessary to provide another source of food algae to avoid sudden discontinuation of food supply which would exert an adverse influence over the mass culture and use of rotifers.

轮虫是一些水生动物或其幼体的良好食饵,其大量培养供应的技术,无疑是很重要的。本文报告一种海水和咸淡水种——褶皱臂尾轮虫(B.Plicatilis)的繁殖生态条件和大量培养技术的实验结果。此种轮虫为广盐性生物,能在2—50‰的盐度范围内生长繁殖,但其适宜的繁殖盐度为10—30‰,而尤以15—25‰为最适宜。休眠卵子能在1.5—35‰的盐度范围内孵化,但以15—20‰为最适宜;最高的孵化率为10.47%。在5—35℃的温度范围内,休眠卵子都能孵化,但孵化时间则随温度的不同而有明显差异。最适宜的孵化温度为20—25℃,时间短,孵化率高;在适宜温度范围内,变温似较恒温对孵化更有利。最高的孵化率为17.53%。在5—40℃的实验温度范围内,此种轮虫都能繁殖生长。但以高温者繁殖快,低温者很慢。较适宜的繁殖温度为25—40℃,而以30—35℃条件下繁殖最快。在温度超越30℃时,轮虫的个体显著变小,这种体形变异是可逆的。实验证实:小新月摄氏菱形硅藻、亚心形扁藻,衣藻和小球藻都是此种轮虫的好饵料;而从大量培养角度看,以扁藻为饵则尤为适宜。较适宜的饵料密度为:扁藻1—15万个/毫升;硅藻5—100万个/毫升。而以扁藻...

轮虫是一些水生动物或其幼体的良好食饵,其大量培养供应的技术,无疑是很重要的。本文报告一种海水和咸淡水种——褶皱臂尾轮虫(B.Plicatilis)的繁殖生态条件和大量培养技术的实验结果。此种轮虫为广盐性生物,能在2—50‰的盐度范围内生长繁殖,但其适宜的繁殖盐度为10—30‰,而尤以15—25‰为最适宜。休眠卵子能在1.5—35‰的盐度范围内孵化,但以15—20‰为最适宜;最高的孵化率为10.47%。在5—35℃的温度范围内,休眠卵子都能孵化,但孵化时间则随温度的不同而有明显差异。最适宜的孵化温度为20—25℃,时间短,孵化率高;在适宜温度范围内,变温似较恒温对孵化更有利。最高的孵化率为17.53%。在5—40℃的实验温度范围内,此种轮虫都能繁殖生长。但以高温者繁殖快,低温者很慢。较适宜的繁殖温度为25—40℃,而以30—35℃条件下繁殖最快。在温度超越30℃时,轮虫的个体显著变小,这种体形变异是可逆的。实验证实:小新月摄氏菱形硅藻、亚心形扁藻,衣藻和小球藻都是此种轮虫的好饵料;而从大量培养角度看,以扁藻为饵则尤为适宜。较适宜的饵料密度为:扁藻1—15万个/毫升;硅藻5—100万个/毫升。而以扁藻2.5—5万个/毫升左右和硅藻50万个/毫升左右为最适宜的饵料密度。轮虫分布密度小者,其繁殖速度快;分布密度大者,繁殖慢。大量培养中兼顾繁殖速度和数量的关系,以每升培养基中含有1,000个轮虫的接种密度较为适宜。在饵料条件突变、过多或过缺的情况下,轮虫即进行有性生殖,形成休眠卵子。培养中利用此特点,突然停止给饵,一般在二、三日内即可采收得休眠卵子。在大玻璃交瓶、水族箱、水泥池和土池中都能进行不同规模的大量培养,实验中都已取得培养效果。大量培养中最重要的问题为饵料条件,要维持适宜且经常的饵料密度,才能保证轮虫及时、迅速地繁殖生长。在大量培养中,在饵料培养基(或轮虫和饵料混同培养基)中加入2—5‰的人尿,则培养效果更好。培养中最高密度达到324,000个/升的活体轮虫,在培养容器的水底腐渣中最高达到1,400,000个/升的个体很小的褶皱臂尾轮虫。在饵料与轮虫同池培养时,如作高密度培养,则必须另外备有可以补充的饵料来源,以防突然饵料不足,影响轮虫大量培养使用的效果。

The upper and lower tolerance limits of Mnina mongolica to salinity under different temperatures were tested. Tolerance limit is defined as the salinity at which 50% of mortality was occured within 24 hours.It has been shown that this cladoceran may be the most euryhaline species. If they are transferred directly from the natural seawater to the water with higher salinities, their lethal upper salinity limit is resulted as 53.6-55.45%. If they are treated with gradually increasing salinity, it has got anoth...

The upper and lower tolerance limits of Mnina mongolica to salinity under different temperatures were tested. Tolerance limit is defined as the salinity at which 50% of mortality was occured within 24 hours.It has been shown that this cladoceran may be the most euryhaline species. If they are transferred directly from the natural seawater to the water with higher salinities, their lethal upper salinity limit is resulted as 53.6-55.45%. If they are treated with gradually increasing salinity, it has got anoth -er result as 65.2-71.5%. The lethal lower salinities limits of them were also tested as 1.36-0,40% and 0.67-0.30% respectively.The present study revealed a better tolerance of animal to a wider range of salinity at the lower temperatures, but their maximum salinity resistance is at 24℃ when the animal were directly transferied to the water with higher salinities.

根据24小时半致死盐度值,测定了不同温度下蒙古裸腹溞(M(?)ina mongolic(?))生存和生殖的盐度上限和下限,试验表明这种溞可能是枝角类中最广盐性的种类,当直接从天然海水移到高盐水中时,其耐盐上限为5(?)6~55.45‰。当逐渐提高盐度时其耐盐上限达到65(?)~74.5‰。两种情况下的耐盐下限分别为1.3~0.40‰和0.67~0.3‰。 试验表明蒙古裸腹溞在低温下耐盐幅度较宽,但从海水直接移到高盐水时以24℃下耐高盐能力最强。

Zooplankton samples were collected in the main stream of Haihe River between May and September 1984. 40 species were identified. The dominant species are euryhalinous species, which reflects the relatively high chlorinity between 0.058—2.204g/l. in the river. The number of species and total individuals of zooplankton decrease with the increasing chlorinity from the upper to the lower reach. Other factors affecting the distributions and fluctuations of zooplankton are also discussed.

海河是流经天津市的主要河流。本文报道了1984年5月和9月两次对海河干流5个站位的浮游动物调查的结果。两次采样共获浮游动物40种。海河干流的氯度变动幅度大,从上游Ⅰ站到下游Ⅴ站变动幅度为0.058—2.204克/升。因此,所获浮游动物中,多数优势种类是广盐性种类。而且,从上游至下游各站位的种类数和个体数随着氯度的增高而减少。同时,还讨论了其他影响海河浮游动物种类分布和变动的因素。

 
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