What is seaweed?

Multicellular algaeKingdom ProtistaPrimary producers chlorophyll to transform light energy from

the sun into chemical energy

Observe seaweed and land plant… what are differences? Similarities?(use a Venn Diagram)

How are seaweeds different from plants?

Differences

Land Plants Seaweed

Roots YES No roots, holdfasts

Nutrients From roots Through cells, surrounding water

Support Vascular System Hydrostatic

Water Fresh Salt

How would you classify seaweed?

Did you know….

There are 3 main types of seaweed?

Chlorophyta (Green algae)

Phaeophyta (Brown algae)

Rhodophyta (Red algae)

Green algae (Chlorophyta)

Pigments: Chlorophyll

Fresh water, Brackish water, and coastal waters

Only 10% of 6-7000 species are marine

Ulva

Examples of Chlorophyta

Halimeda

•Calcareous green algae helps in coral reef growth.

Examples of Chlorophyta

Neomeris

Cladophoropsis

Brown Algae (Phaeophyta)

Pigment: chlorophyll AND additional colors to make it brown

Dominate colder region coastlines

Size: small and delicate to large and thick

Kelp

Examples of Phaeophyta

SargassumPadina

Laurencia

Dictyoda

Examples of Phaeophyta (Kelp)

Laminaria

Nereocystis

MacrocystisHow tall would you be if you grew 20 inches per day?

Red algae (Rhodophyta)

Pigments: chlorophyll AND red or blue

Dominant algae in the tropics, grow in all oceans

Deepest depths

Red > Green + BrownPterocladia

Examples of Rhodophyta

Liagora

Galaxaura

Examples of Rhodophyta

Gracilaria (Ogo)

Examples of Rhodophyta

CorallineEncrusting Branching

What type of marine animal does this look like?

And even more examples!

Chondrus - Irish Moss

Botryocladia

Amansia

Would you consider boiling one of these to make pudding?

Make a list 1-8… walk around and decide what Phylum each belongs to.

Invasive Seaweed

The Super Sucker!

Uses of Seaweed

How do you think people use seaweed?

Using the reading list down 10 uses for seaweed (only 5 can be food related)