The first trophic level is the primary producers, the grass.

第一层营养是初级生产者，草。

Ecologists call this row of biological dominoes a trophic cascade.

生态家把这一系列生多米诺骨牌效应称为营养级联。

Decomposers can also be considered to occupy their own trophic level.

分解者也可被认为占据自己的营养级。

They can be used to show numbers of organisms or biomass of each trophic level in ecosystem.

它们可用来显示生态系统中每营养水平的生数量或生量。

The bars each represent trophic levels, and their order represents the flow of energy.

每条形代表营养水平，它们的顺序代表能量的流动。

The organisms in a food chain are classified into their trophic level depending on their feeding behavior.

食链中的生根据它们的摄食行为被划分为不同的营养等级。

The third trophic level is secondary consumers which is the example of fox.

第三营养等级是次级消费者，为例。

From the producers, the second trophic level is the herbivores, the organisms that eat the plants.

从生产者来看，第二营养层次是食草动，即植为食的生。

The impact of a predator down through the food web all the way to plants is called a trophic cascade.

捕食者沿食链往下一路直达植的影响被称为“营养级联”。

We've included decomposers in a trophic level five, in this example, it's the fungi.

我们把分解者包括在营养级五级，在这例子中是真菌。

The width of the bar in the number pyramids represents the number of organisms in that trophic level.

数字金字塔中条形的宽度代表该营养级中生的数量。

This carefully balanced trophic cascade has fallen apart in Northern California.

这种精心平衡的营养级联在加利福尼亚州北部已经崩溃。

The trophic cascade fell out of balance.

营养级联失去了平衡。

Scientists call this type of carefully balanced relationship between different species a trophic cascade.

科家将不同种之间这种精心平衡的关系称为“营养级联”。

Another is that there's generally more food easily available at lower trophic levels.

另一原因是，在较低的营养水平下通常更容易获得更多食。

The second trophic level, and so on up through secondary consumers, tertiary consumers until you reach the highest trophic level in that ecosystem.

第二营养级，依此类推，然后是二级消费者，三级消费者，直到达到生态系统中最高的营养层。

We've restored the trophic interactions that we want to see in a rain forest.

我们已经恢复了我们希望在雨林中看到的营养相互作用。

The width of the bar in biomass pyramids represents the biomass of the organisms in that trophic level.

生量金字塔中条形的宽度代表该营养级生体的生量。

Now let's look at the trophic levels in this community.

现在让我们来看看这群落的营养水平。

These categories are not strictly defined, as many organisms feed on several trophic levels.

这些类别没有严格定义，因为许多生几种营养水平为食。