Bacillariophyta—the diatoms

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Ecology of Chrysophytes Common in the plankton of lakes especially during the colder parts of the year May occasionally form blooms that colour the water brown and give taste and odour problems—Eg Ochromonas Some species also found in cold steams and springs. Acid lakes and bogs, support a diverse Chrysophyte community, most important primary producers in such systems.
Pyrrophyta--Dinoflagellates •Cells fairly large (>25 microns) •Nucleate (1), •Cellulose wall often present •Cells with grooves (sulci) within which flagellae lie •Chloroplasts, 2 or more small disc shaped, brown to golden brown (chlorophyll a, c, plus carotenoids), •Food stored as starch and oils •Cells often emitting bioluminescence •Cells very motile (~ 5-10 mm/sec) •Often live as “mixotrophs” --ingest bacteria--phagocytosis
Page 1 and 2: Bacillariophyta—the diatoms •th
Page 3 and 4: The new valve is always a hypovalve
Page 5 and 6: Some examples of pennate diatoms ge
Page 7 and 8: Some pennate forms are colonial and
Page 9 and 10: Examples of centric diatoms Non-rap
Page 11 and 12: Achnanthes: heterovalvular, one val
Page 13 and 14: Epiphytic pennate diatoms
Page 15 and 16: Chrysophyta--Golden brown algae Cel
Page 17: 50 microns large branched colonies,
Page 21 and 22: Gonyaulax—causes red tides, shell
Page 23: Pfiesteria—a toxic dinoflagellate

Bacillariophyta—the diatoms

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