The bleaching caused the corals to lose their zooxanthellae.

白化导致珊失去了它们的虫黄。

If they do not recover their zooxanthellae, they will die.

如果它们不能找回自己的虫黄，它们就会死。

When the coral is stressed, the zooxanthellae die back.

珊受到压迫会导致黄萎缩。

Zooxanthellae supply their coral hosts with food, which they produce through photosynthesis.

虫黄通过光作用食物，并将其贡献给珊宿主。

Here corals get most of their colour from the microscopic algae that live inside their tissues, the zooxanthellae.

里珊的颜色大都自只能通过显微镜才能看到的类，类生长在珊的组织--黄中。

When tropical waters get too warm, it destroys the delicate, symbiotic relationship between coral and microscopic algae called zooxanthellae.

当热带水域的温度过高时，会破坏珊与虫黄微小类间互利共生的微妙关系。

They have the same zooxanthellae that we saw within the corals.

它们具有与我们在珊中看到的相同的虫黄。

Healthy, unbleached corals rely on their algae, known as zooxanthellae to absorb some sunlight.

健康、未漂白的珊依靠它们的类（称为虫黄）吸收一些阳光。

Warm-water corals maintain a symbiotic  relationship with microscopic algae called zooxanthellae.

温水珊与称为虫黄的微观类保持着共生关系。

To get the energy and nutrients they need to grow, the polyps team up with algae called zooxanthellae.

为了获得生长所需的能量和营养，水螅体与称为虫黄的类作。

Corals are able to photosynthesize because of a special partnership, a symbiosis that they havewith a single-celled algae called zooxanthellae.

珊之所以能够进行光作用，是因为它们与一叫做虫黄的单细胞类有一特殊的伙伴关系。

With the help of zooxanthellae, corals build rigid exoskeletons in dynamic formations, which  create a coral reef's three-dimensional structure.

在虫黄的帮助下，珊在动态地层中构建刚性外骨骼，从而形珊礁的三维结构。

So this is a micrograph, a microscopic photograph I've taken, of some zooxanthellae from the tentacleof the upside-down jellyfish Cassiopeia.

所以是一张显微照片， 我拍的一张显微照片，是倒置水母仙后座触须中的一些虫黄。

This is an organism that, just like the corals we were talking about, has these zooxanthellae inside of them and can photosynthesize.

是一生物， 就像我们正在谈论的珊一样，它们体内有些虫黄并且可以进行光作用。

And some of these nudibranchs that do thatare able to take those zooxanthellae that we were talking about earlier, put them inside of their own cells, and then they become photosynthetic.

一些样做的裸鳃类动物能够吸收我们之前谈到的那些虫黄，将它们放入自己的细胞内，然后它们就会进行光作用。