Lab 9- Algae
Lab Report Oddities
• Post lab 9, Question 4- – Only 2 kingdoms, not 3
• Pre Lab 10, Question 1 (255) – Answer for A in the blank for A below question
Gametic Life Cycle Adult 2N- two copies of chromosomes
Examples- Diatoms, Fucus
1 Zygotic Life Cycle
Adult 1N- one copies of chromosomes
2N Zygote
1N
Examples- Spirogyra, Chlamydomonas
Sporic Life Cycle 2 Adults: 1N, 2N
Examples- Laminaria, Ulva
General Algae Characteristics
• Autotrophic (mostly) – Chlorophyll a • Aquatic – Marine or Fresh Water • Phytoplankton or Microalgae- Unicellular • Macroalgae- multicellular • Sessile (generally) – Attached to a solid substrate (ex- rocks, trees) – Few found on slow moving mammal (sloths)
2 Kingdom Stramenopila
• General Characteristics – Hairy Flagella (usually in reproductive phase) – Autotrophic OR Heterotrophic •Phylums – Oomycota – Chrysophyta – Diatom – Phaeophyta
Kingdom Stramenopila
Hyphae & Oogonia • Phylum Oomycota – Hetertrophic – Cellulose cell wall – Dioecious – Gametic meiosis
zoosporangia
Phylum Diatoms
• Phytoplankton • Chlorophyll a & c, • Carotenoids • Silica cell walls • Reproduce asexually (mostly) • Gametic Meiosis during sexual reproduction
3 Phylum Diatoms
Centric Pennate (Marine water) (fresh water)
Not Diatoms
Dinoflagellata Foraminifera Actinopoda (Radiolarian)
Phylum Phaeophyta
• Macroalgae
• Chlorophyll a & c & Carotenoids
• Store energy as laminarin and mannitol
• Cellulose cell walls
• Gametes: 2 flagella
4 Macroalgae Anatomy
• Blade
•Stipe
• Air bladder – pneumatocyst
• Holdfast
Phylum Phaeophyta
• Genus Laminaria
• Sporic Meiosis
• Similar life cycle to plants
Phylum Phaeophyta
• Genus Fucus
• Gametic Meiosis
• Called “Brown” algae, but isn’t necessarily
5 Macrocystis Kelp Forest California Kelp Forests
Kingdom Plantae
• Autotrophic
• Chlorophyll a, b & Carotenoids
• Starch as food reserve
Phylum Chlorophyta
• Genus Spirogyra
• Unicellular Colonial
• Zygotic Meiosis – Reproduction via conjugation
6 Phylum Chlorophyta
• Genus Ulva
• Macroalgae
• Sporic Meoisis
Phylum Chlorophyta
• Genus Codium
• Gametic Meiosis
Phylum Chlorophyta
• Genus Chlammydomonas
• Freshwater phytoplankton
• Glycoprotein cell wall
• Zygotic meiosis
7 Phylum Chlorophyta
• Genus Volvox
• Colonial microalgae
• Asexual and Sexual reproduction
Phylum Rhodophyta
• Macroalgae (mostly)
• Autotrophic (mostly)
• Chlorophyll a, phycobilins, carotenoids
• Varied cell walls – Cellulose,
–CaCO3, – Sulfacted galactons
Phylum Rhodophyta
• Forms- filamentous
8 Phylum Rhodophyta
• Forms- filamentous highly branched
Phylum Rhodophyta
• Forms- foliacous
Phylum Rhodophyta
• Forms- encrusting coralline
9 Phylum Rhodophyta
• Forms- jointed coralline
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