What is seaweed?
Multicellular algae
Kingdom Protista
Primary producers
chlorophyll to transform light energy from the
sun into chemical energy
How are seaweeds different
from plants?
Differences
Support
Seaweed
No roots,
holdfasts
From roots
Through cells,
surrounding
water
Vascular System Hydrostatic
Water
Fresh
Salt
Tissue types
Several
One
Roots
Nutrients
Land Plants
YES
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
Laurencia
Sargassum
Padina
Dictyoda
Examples of Phaeophyta (Kelp)
Laminaria
How tall would
you be if you
grew 20 inches
per day?
Macrocystis
Nereocystis
Red algae (Rhodophyta)
Pigments: chlorophyll
AND red or blue
Dominant algae in the
tropics, grow in all
oceans
Deepest depths
Red > Green + Brown
Pterocladia
Examples of Rhodophyta
Liagora
Galaxaura
Examples of Rhodophyta
Gracilaria (Ogo)
Examples of Rhodophyta
What type of marine animal does this look like?
Encrusting
Coralline
Branching
And even more examples!
Chondrus - Irish Moss
Would you consider boiling
one of these to make
pudding?
Amansia
Botryocladia
Invasive Seaweed
Uses of Seaweed
 How do you think people use seaweed?