1. EUKARYOTES — having a true nucleus Chromophyta - containing chlorophyll a and c
Coscinodiscus waelesii
Phytopia CD-ROM
Bigelow Laboratory

2. EUKARYOTES (continued): Division Chromophyta Class Cryptophyceae
Motile
Contain phycobiliproteins
Can be recognized by size and fluorescence
(flow cytometry)
Cryptomonas
clases.htm

3. EUKARYOTES (continued): Division Chromophyta Class Bacillariophyceae (Diatoms)
Cannot swim; Can regulate buoyancy (some can migrate)
Require silicon; Encased in Pill-box shaped silica frustule
Important in coastal areas and spring blooms

4. Diatoms P. Roger Sweet, Indiana University

5. Images from http://www.microscopy-uk.org.uk/mag/wimsmall/diadr.html
Diatoms
pennate
pennate
Images from
Silica frustule
centric

6. EUKARYOTES (continued): Division Chromophyta Class Pyrrophyta (Dinoflagellates)
Motile; Can migrate vertically
“Red tides” and shellfish poisoning
There are autotrophic and heterotrophic species

7. Dinoflagellates: Some are bioluminescent
Noctiluca
Noctiluca bloom

8. EUKARYOTES (continued): Division Chromophyta Class Prymnesiophyceae (Haptophyceae) Coccolithophores
Near-real-colour SeaWiFS image of a coccolithophore bloom in the Bering Sea, April 1998.
earthguide.ucsd.edu/demo/zalaska/08_03_1999a.html
CaCO3 skeletal plates
pCO2 increases
DMS production
Emiliania huxleyi
earthguide.ucsd.edu/images/eg/img/ehuxleyi.gif

9. EUKARYOTES (continued): Division Chromophyta Class Prymnesiophyceae (Haptophyceae) Phaeocystis
Jelly-like colonies clog nets and cause big problems on beaches in Europe
Food-web alterations
DMS producer
Common in Antarctic

10. Aureococcus brown tides
EUKARYOTES (continued): Division Chromophyta Class Chrysophyceae Silicolagellates, Pelagomonas, Aureococcus
Aureococcus brown tides

11. toxic or harmful blooms
EUKARYOTES (continued): Division Chromophyta Class Raphidophyceae Chattonella, Fibrocapsa, Heterosigma
toxic or harmful blooms
Chattonella marina
Chattonella antiqua
Cells of Chattonella marina showing different forms (ovoid, pointed-end and sausage-shaped) and a temporary cyst.