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

第一层营养是初级生产者，草。

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

解者也可以被认为占据自己营养级。

Ecologists call this row of biological dominoes a trophic cascade.

生态学家把这一系列生物多米诺骨牌效应称为营养级联。

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

它们可以用来显示生态系统中每营养水平生物数量或生物量。

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

食物链中生物根据它们摄食行为被划为不同营养等级。

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

每条形代表营养水平，它们顺序代表能量。

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

捕食者沿食物链往下一路直达植物影响被称为“营养级联”。

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物，即以植物为食生物。

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，以狐狸为例。

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

数字金字塔中条形宽度代表该营养级中生物数量。

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

我们把解者包括在营养级五级，在这例子中是真菌。

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

科学家将不同物种之间这种精心平衡关系称为“营养级联”。

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

这种精心平衡营养级联在加利福尼亚州北部已经崩溃。

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营养相互作用。

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

另一原因是，在较低营养水平下通常更容易获得更多食物。

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

生物量金字塔中条形宽度代表该营养级生物体生物量。

The trophic cascade fell out of balance.

营养级联失去了平衡。

The number of steps an organism is from the start of the food chain is a measure of its trophic level.

一生物体从食物链开始步骤数是衡量其营养水平标准。

So to summarise, trophic levels are the number of steps in an organisms is within a food chain.

总而言之，营养级是一生物体在食物链中层级数。

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

这些类别没有严格定义，因为许多生物以几种营养水平为食。