Brown algae

Definition

Brown algae are large, multicellular marine algae belonging to the class Phaeophyceae. They are known for their brownish color due to the presence of the pigment fucoxanthin.

5 Must Know Facts For Your Next Test

1. Brown algae contain chlorophyll a and c, but their brown color is due to the pigment fucoxanthin.
2. They play a significant role in marine ecosystems as primary producers and habitats for various marine organisms.
3. Many species of brown algae have commercial uses, including alginate extraction for food thickening and medical applications.
4. Kelp forests, which are formed by certain types of brown algae, are among the most productive and dynamic ecosystems on Earth.
5. Brown algae reproduce both sexually and asexually through complex life cycles involving alternation of generations.

Review Questions

• What pigment gives brown algae their distinctive color?
• How do brown algae contribute to marine ecosystems?
• Name one commercial use of brown algae.

Related terms

Chlorophyll:

A green pigment found in cyanobacteria and the chloroplasts of algae and plants.

Fucoxanthin:

A natural pigment found in brown algae that gives them their characteristic color.

Alginate: A polysaccharide derived from brown seaweed used as a food additive and in medical products.