The bleaching caused the corals to lose their zooxanthellae.

白化导致珊瑚失去了它们的虫黄藻。

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

如果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.

珊瑚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，并将其贡献给珊瑚宿主。

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

这里珊瑚的颜色大都来自只能通过显微镜才能看到的藻类，这种藻类生长在珊瑚的组织--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，会破坏珊瑚与虫黄藻这种微小藻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瑚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、未漂白的珊瑚依靠它们的藻类（称为虫黄藻）吸收一些阳光。

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

温水珊瑚与称为虫黄藻的微观藻类保持着共生关系。

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，水螅体与称为虫黄藻的藻类合作。