The bleaching caused the corals to lose their zooxanthellae.

白化导致珊失去了它们的虫黄藻。

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

它们不能找回自己的虫黄藻，它们就会死。

When the coral is stressed, the zooxanthellae die back.

珊受到压迫会导致黄藻萎缩。

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

虫黄藻通过光合作用来合成食物，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.

这里珊的颜色大都来自只能通过显微镜才能看到的藻类，这种藻类生长在珊的组织--黄藻中。

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，会破坏珊与虫黄藻这种微小藻类间互利共生的微。

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藻。

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藻类（称为虫黄藻）吸收一些阳光。

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

温水珊与称为虫黄藻的微观藻类保持着共生。

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，水螅体与称为虫黄藻的藻类合作。

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合作用，是因为它们与一种叫做虫黄藻的单细胞藻类有一种特殊的伙伴。

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

在虫黄藻的帮助下，珊在动态地层中构建刚性外骨骼，从而形成珊礁的三维结构。

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

所以这是一张显微照片， 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藻。

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

这是一种生物， 就像我们正在谈论的珊一样，它们体内有这些虫黄藻并且可以进行光合作用。

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.

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