28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

28.12. Stramenopile flagella

Powdery mildew

28.17. The life cycle of a water mold

28.17. The life cycle of a water mold

28.17. The life cycle of a water mold

Zoospore release

Water mold: Oogonium

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

Absorption spectra for different algal pigments

28.3. Diatoms: Diatom diversity (left), Pinnularia (left)

Diatom shell

28.13. Freshwater diatoms (colorized SEM)

Diatoms (Bacillariophyta)

Cyclotella Navicula

You are given an unknown organism to identify.It is unicellular and heterotrophic. It is motile, with well-developed organelles and two nuclei, one large and one small. You conclude that this organism is most likely a member of which major group?

A. diatoms

B. amoebozoans

C. red algae

D. ciliates

E. water molds (oomycetes)

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

28.14. Dinobryon.A colonial, freshwater golden alga

Yellow (carotene) and brown (xanthophyll) pigments

28.15. Brown Algae: Kelp forest

Kelp forest

28.16. The life cycle of Laminaria:an example of alternation of generations

28.26. The life cycle of Laminaria:an example of alternation of generations

Isomorphic alternation of generationsHeteromorphic alternation of generations

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

Protistan Diversity (see book p. 598)

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

Chlorarachniophytes

Acquired chloroplasts via secondary endosymbiosis

28.3. Foraminiferan (forams) will snail-like shell and thread-like pseudopodia

Calcium carbonate shells

radiolarians

Radiolarian skeleton

Silica shells

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

Absorption spectra for different algal pigments

28.20. Red algae: Rhodophyta

Chromatic adaptation

28.20.Edible seaweed (red algae)

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

28.21 Colonial and multicellular chlorophytes: Volvox (left), Caulerpa (middle) and Ulva (right)

28_03dVolvoxDaughter_SV.mpg

Spirogyra conjugating

28.22. The life cycle of Chlamydomonas: Example of isogamy

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

Amoeba

pseudopodium

Amoebas: Use of pseudopodia for feeding

28.3A phylogenetic hypothesis of eukaryotes(see book page 578)

28.24. Plasmodial slime mold

28.24. The life cycle of a plasmodial slime mold, such as Physarum

Slime mold Sporangia

28.25 The life cycle of a cellular slime mold (Dictyostelium)

Dictyostelium life cycle

28.27. Protists play key roles in ecological relationships(and in public health)

Protists are key producers in aquatic communities. Up to 25% of the world’s photosynthesis is performed by protists.

Organisms in aquatic communities depend on photosynthetic protists for food

28.7. Protists play key roles in ecological relationships(and in public health)

High water temperatures (global warming) and pollution cause corals to expel their symbiotic dinoflagellate protists

This results in coral bleaching and, eventually coral death

28.7. Protists play key roles in ecological relationships(and in public health)

Some examples of parasitic ProtistsEntamoeba histolyticaEntamoeba coliEntamoeba gingivalisEndolimax nanaIodamoeba butschliiNaegleria fowleriGiardia lamblia (intestinalis)Chilomastix mesniliTrichomonas vaginalisLeishmania donovaniLeishmania tropicaLeishmania braziliensisTrypanosoma gambiense and rhodesiense (African trypanosomiasis)Trypanosoma cruzi (American trypanosomiasis)Plasmodium spp. (Malaria)Toxoplasma gondiiPneumocystis cariniiCryptosporidiumSpp spp.Balantidium coli

Entamoeba histolytica (amebic dysentery)

Summary of key concepts (see book p. 598-599)

Each of the following groups includes many planktonic species EXCEPT

A. golden algae.

B. forams (foraminiferans).

C. dinoflagellates (Pyrrhophyta).

D. kinetoplastids.

E. diatoms.