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Plantlike Protists

Plantlike Protists. General characteristics. contain chlorophyll and carry out photosynthesis commonly called algae four phyla: euglenophytes , chrysophytes , diatoms, dinoflagellates accessory pigments help absorb light, give algae a variety of colors . Phylum Euglenophyta. Euglena

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Plantlike Protists

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  1. Plantlike Protists

  2. General characteristics • contain chlorophyll and carry out photosynthesis • commonly called algae • four phyla: euglenophytes, chrysophytes, diatoms, dinoflagellates • accessory pigments help absorb light, give algae a variety of colors

  3. Phylum Euglenophyta • Euglena • live in waterhave 2 flagella for movementuse chlorplasts for photosynthesis, but can turn into heterotrophs if they are kept in the darkhas an eyespot used for sensing light and darkpellicle - like a cell wall, helps maintain their shapes

  4. Euglena algal bloom

  5. Chrysophytesyellow-green algae, "golden plants" • Cell walls made of pectin, not cellulose • Food stored as oil, not starch • Some are colonial

  6. Phylum Bacillariophyta • Diatomsproduce thin cell walls of silicon, main component of glass • Their cell walls are made of silicon; they are glasslike • Used as abrasives • Ex. ___________

  7. Phylum Pyrrophyta • DinoflagellatesOften have two flagellaluminescent • ½ are photosynthetic • Biolumenescent • Cause red tides

  8. Red Tide is caused by a "population explosion" of toxic, naturally occurring microscopic plankton (specifically, a subgroup known as dinoflagellates). "Blooms" of the poison-producing plankton are coastal phenomena caused by environmental conditions, which promote explosive growth. Factors that are especially favorable include warm surface temperatures, high nutrient content, low salinity, and calm seas. Rain followed by sunny weather in the summer months is often associated with red tide blooms.

  9. Alexandriumfundyense, along the Atlantic Northeast coast, ranging from the Canadian Maritimes to Southern New England; • Alexandriumcatenella, on the Pacific West Coast from California to Alaska; and • Karoniabrevis, in the Gulf of Mexico along the West Florida coast. • Does it really color the water?Yes, water in coastal areas can be colored red by the algae, thus the term "red tide.”

  10. Penn Cove, Washington

  11. How harmful are algal blooms? • Red tide algae make potent natural toxins. It is unknown why these toxins are created, but some can be hazardous to larger organisms throught the processes of biomagnification and bioaccumulation. Grazers such as fish and krill are unaffected by the toxins, so as they eat the algae the toxins are concentrated and accumulate to a level that is poisonous eat to organisms that feed on them. Large fish kills and several mammalian diseases and deaths have been attributed to consumption of shellfish during red tide algal blooms. Diseases that may affect humans include:

  12. Red Tides • Paralytic Shellfish Poisoning (PSP )- PSP toxins disrupt nerve function and cause paralysis. Extreme cases may result in death by asphyxiation by respiratory paralysis. It usually comes from shellfisht.

  13. Algae Protists • Pigments- all contain chlorophyll a as well as the following accessory pigments. • Red- phycobilins • Brown- Fucoxanthin • Green- Chlorophyll a and b

  14. Red algae • Live at great depths due to pigments that need little light • Most are multicellula • Provide nutrients to coral reefs

  15. Brown algae • All are multicellular • Large and complex • Mostly marine

  16. The Sargasso Sea 1100 km x 750 km

  17. Image from space

  18. Green algae • Ancestors of green plants • No fossils • Some are single-celled; some colonial; some multicellular • Many multicellular are filamentous, such as spirogyra • Reproduction is similar to mosses by Alternation of Generations.

  19. Alternation of generations • Switching back and forth between haploid (n) gametophyte, which makes gametes (sex cells) and diploid (2n) sporophyte, which makes spores. • Unusual in that the gametophyte is actually an organism that is visible and can live on its own.

  20. Alternation of Generations

  21. Human Uses of Algae • Write down 3 human uses of algae and 1 non-human.

  22. FunguslikeProtists • Slime molds-important decomposers • Phylum AcrasiomycotaCellularslime molds-. They are amoeboid and make fruiting bodies.

  23. Acellular slime molds • Phylum Myxomcota- they also start out amoeboid but then aggregate to form plasmodia. • They can grow to be several meters long.

  24. Ecology of FunguslikeProtists • Use your book to research this.

  25. Ecology • Decomposers • Plant diseases including some major blights. • P. infestans may be responsible for many of you being in the U.S. Explain this and then discuss it with your neighbor.

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