桡足类

During their long evolutionary history, starting in the Lower Cretaceous, copepods spread over all the continents, as well as they successfully colonized about all the available water habitats of the Planet, becoming well adapted or specialized to very different salinity regimes, from marine and hypersaline waters to continental freshwater bodies, and to a wide range of temperature from the polar to the hot springs waters.

在长期进化史，最早始於早期的白垩纪，桡足类散布在各大洲，牠们不但成功地移植居住於地球上所有可利用的水域，而且从海洋与高盐度水域到大陆棚淡水的水体，变成容易适应或限定在不同盐度范围，从极区到热泉的水域具有宽广的温度范围。

A total of 206 copepod species recorded coexisted respectively to 5 ecotypes.

所记录的206种浮游桡足类中，5种生态类群共存。

The salinity tolerance range of this copepod extended effectively after acclimation, and display its potential distribution area.

盐度驯化能有效地扩大该种桡足类的耐盐范围，从而了解其潜在的地理分布范围。

Calanus sinicus is the dominant planktonic copepod in the Yellow Sea and the East China Sea. The population abundance is high in spring and decreases in summer.

中华哲水蚤是我国黄海和东海中浮游桡足类中的优势种，其种群的数量变动影响到整个海洋系统的结构和功能的变化。

Calanus sinicus is the dominant planktonic copepod in the Yellow Sea and the East China Sea. The population abundance is high in spring and decreases in summer .

中华哲水蚤是我国黄海和东海中浮游桡足类中的优势种，其种群的数量变动影响到整个海洋生态系统的结构和功能的变化。

This was attributed to high population growth rates for rotifers under these ecological conditions because of reduced copepod predation on them through a trophic cascade from fish.

这个归因于轮虫在这些生态条件下的较高种群增长率，这些生态条件是由于桡足类对它们的捕食通过一个鱼类高富营养阶段。

Copepod larvae also formed an important component.

此外，桡足类幼体也是底边界层动物的重要组成部分。

During vertical migration , the copepod is assumed to instantaneously check the variations of the environmental parameters and can thereby make the optimal behavioral strategy to maximize the value of venturous revenue , i .

在垂直迁移的过程中，我们假设桡足类个体能够即时识别环境参数的变化从而采取最优的行为策略以获取风险收益的最大值，即以尽可能小的死亡代价获取尽可能多的食物。

The main dominants were copepod species, with the dominance degree of Paracalanus parvus being the highest.

海区内桡足类在种类和数量上占绝对优势，其中小拟哲水蚤优势度最高。

The copepod assemblage was composed of omnivorous and carnivorous species, which added invertebrate predation to the experiment and which intensified as the season progressed.

桡足类群体由杂食性和食肉性种组成，为试验中无脊椎动物的掠食增加，同时加剧季节性进展。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。