Phaeophyta

Definition

Phaeophyta, commonly known as brown algae, are a group of mostly marine, multicellular algae that are characterized by their brown color due to the presence of the pigment fucoxanthin. They play significant ecological roles in coastal environments and are used in various industries.

5 Must Know Facts For Your Next Test

1. Phaeophyta contain chlorophyll a and c, but their characteristic brown color comes from the pigment fucoxanthin.
2. Most species of Phaeophyta are found in marine environments, particularly in cold waters.
3. Common examples include kelp and Sargassum, which form large underwater forests or floating mats.
4. Brown algae have complex life cycles that often involve both sexual and asexual reproduction stages.
5. They possess alginic acid in their cell walls, which is harvested for use in food products and industrial applications.

Review Questions

• What pigments are responsible for the coloration of Phaeophyta?
• In what type of environments are Phaeophyta most commonly found?
• Name two common examples of Phaeophyta and describe their ecological roles.

Related terms

Chlorophyll:

A green pigment found in the chloroplasts of plants, algae, and cyanobacteria essential for photosynthesis.

Fucoxanthin:

A brown carotenoid pigment found in brown algae that helps capture light energy for photosynthesis.

Kelp Forests: Underwater areas with high density of kelp, which provide habitat and food for a variety of marine organisms.