The tours
Trail

Algae

A form of life that appeared 3.5 billion years ago, at the origin of the oxygen we breathe and of plant life on land.

Before it was ever a resource or a livelihood, seaweed was a living organism. This first tour explains its nature: how it is classified, what it is made of, how it feeds, breathes, communicates and reproduces — and why it sits at the base of the entire marine food chain.

The stops

  1. Algae, an ancient and varied form of life
  2. Classification by size: microalgae and macroalgae
  3. Classification by colour: green, brown and red
  4. Portrait Pierre Arzel, biologist and seaweed specialist
  5. The different parts of an alga
  6. The physiological needs of algae
  7. The different ways algae reproduce
  8. A plant at the base of ecosystems and the food chain
  9. Invasive and proliferating algae