Protists
• The most diverse kingdom of eukaryotes
• Mostly aquatic organisms
• Mode of nutrition is used to classify
protists into 3 main groups
– Protozoa (ingestive, animal-like)
– Algae (photosynthetic, plant-like)
– Slime molds (absorptive, fungus-like)
Directions
• READ CAREFULLY
• LOOK AT PICTURES
• REMEMBER INFORMATION AND
PICTURES
• USE YOUR NOTES TO RELATE PPT TO
THE TAXONOMY AND INFORMATION
GIVEN
A common protozoan is the paramecium –
can you see the cilia?
http://faculty.plattsburgh.edu/jose.deondarza/research/Photos/Paramecium.jpg
Protozoans
• Trypanosoma --------- is
the protozoan that causes
African sleeping sickness
• Giardia ------------------
causes the diarrhea
sickness contracted from
contaminated water (yuck! –
always bring your own water
on hikes!)
www.innovations-report.com/. ../report-19279.html martin.parasitology.mcgill.ca/.../ GIARDIA.HTM
Rhizopods
•This drawing of an
amoeba illustrates the
pseudopod.
• Can you recognize the
pseudopod in this
amoeba?
http://shs.westport.k12.ct.us/mjvl/biology/cells/amoeba.gif
Plasmodium
•These protozoans may seem
harmless since they can’t
move far on their own, but they
use vectors, such as insects,
to get them where they want to
go.
•Plasmodium (purple in a field
of red blood cells) is the
protozoan that causes malaria
with the help of mosquitoes as
the vector.
parasitol.wkhc.ac.kr/ image/oth/mosq.GIF
More Rhizopods: Note
the psdeudopods
• Heliozoans
• Radiolarians
• Foraminiferans
Now that you are a protozoan pro, do you
remember the next group of protists – those that
make their own food?
Click to see the correct answer…
ALGAE
Algae
There are 6 main phyla of these plant-like
protists:
1. Green algae
2. Euglena
3. Dinoflagellates
4. Diatoms
5. Red algae
6. Brown algae
Let’s take a look…
Green algae:
chlorophyta
•Green algae are thought to
be the direct ancestor of
land plants
http://www.acadweb.wwu.edu/courses/envr429-rm/Robin/images/envr429/27_oedogonium_40x.jpg
www.sonoma.edu/biology/ algae/Green.html www.acadweb.wwu.edu/.../ 25_hydrodictyon_40x.jpg
Euglena
The euglena
performs
photosynthesis like
a plant, but has a
flagellum and
moves around like a
protozoan – cool!
http://www.cartage.org.lb/en/themes/Sciences/BotanicalSciences/MajorDivisions/KingdomProtista/Protists/euglena.gif
http://www.bgbm.org/kusber/images/euglena.gif
Dinoflagellates
• have 2 flagella that
make them spin;
some can secrete
dangerous toxins –
one example is the
red tides caused by
Pfiesteria, which lead
to fish kills
http://www.infectiousdiseasenews.com/199906/S9a06587.gif
http://biology.nebrwesleyan.edu/Courses/Labs/Biology_of_Animals/ZooLab9/Dinoflagellates_100X.jpg
Zooxanthellae
• Dinoflagellate that lives in a symbiotic
relationship with coral. When removed via
water warming coral dies (coral bleaching).
Note the tentacle colonized by the
zooxanthellae.
Red Tides: Another dinoflagellate
Diatoms
This phylum of algae is noted
for its symmetry and beautiful
glass shells
http://www.lifesci.ucsb.edu/mcdb/research/facilities/microscopy/diatom.jpg
http://www.acnatsci.org/research/biodiv/diatompics/diatom.jpg
http://www.nhm.ac.uk/hosted_sites/quekett/Others/Gallery/Helios/diatom.jpg
Red algae:
rhodophyta
* The red pigment,
phycoerythrin, allows red algae
to photosynthesize at greater
depths
* The agar in the plates that we
used for the bacteria lab was a
red algae
* Carrageenan (an ingredient
in many ice creams) and Nori
(the wrapping around sushi)
are both red algaes
www.alumni.ca/ ~thoga3n/redalgae.gif faculty.clintoncc.suny.edu/ faculty/Michael.Gr ...
Nori: red algae used for makisushi
Brown algae; phaeophyta
The largest living algae; kelp forms an underwater
forest-like habitat.
http://www.sonoma.edu/biology/algae/Nereocystis.GIF http://www.nmnh.si.edu/botany/projects/algae/Imag-Pha.htm
Slime molds
• Slime molds obtain
food through
decomposition of
organic material
• This is a slime mold>
commonly found on
grass. It’s called the
dog vomit slime mold
– eewww, gross!
Okay, quiz time!
• Name the three categories of protists –
say them out loud to your partner
* hint: one is animal-like, one is plant-
like, and one is fungus-like
click to see the answers
1. Protozoans (animal-like)
2. Algae (plant-like)
3. Slime molds (fungus-like)
Matching:
match each protozoan with it’s mode of locomotion
Cilia (ciliaphora)
Flagella (mastigophora)
Pseudopod (sarcodina)
Click to see the correct answers
What protozoan doesn’t
move? Click again to see answer…
Apicomplexa
Matching Part Deux:
On a separate sheet of paper, match each numbered
statement with the correct lettered organism (some used
twice). Answers are on the next slide.
1. Pretty glass shells a. Dinoflagellates
2. Huge kelp beds
b. Trypanasoma
3. Lead to red tides
4. Causes African Sleeping Sickness c. Slime molds
5. Sushi wrap
d. Diatoms
6. One type is “dog vomit”
7. Has flagella and chloroplasts e. Red algae
8. Have 2 flagella
f. Brown algae
9. Decompose their food
10. Causes malaria g. Green algae
11. Ancestors of land plants
h. Euglena
12. Can photosynthesize at great depths
i. Plasmodium
Answers
• 1 d
• 2 f
• 3 a
• 4 b
• 5 e
• 6 c
• 7 h
• 8 a
• 9 c
• 10 I
• 11 g
• 12 e
Matching practice: Answers on next page
a. Dinoflagellates g. phaeophyta
b. Trypanasoma h. chlorophyta
c. Slime molds i. rhodophyta
d. Diatoms j. Euglena
e. Paramecium k. Plasmodium
f. Giardia l. rhizopoda
1 2 3 4
5 6 7 8
Answers
• 1. i
• 2. c
• 3. h
• 4. l
• 5. e
• 6. d
• 7. k
• 8. j
Yes, you are
now excused!