1. Organizing the diversity
Systematics; studying the diversity
Taxonomy to classify organisms & groups

2. Domains Bacteria & Archaea
Domain Eukarya
Prokaryotic
Bacteria and bacteria-like
Simpler
Smaller cell size
DNA without nucleus
Cell wall & other crude protective layers
Lack organelles
Eukaryotic
Protista, Plants, Fungi, & Animals
Complex
>cell size; 10x larger
DNA in nucleus
Cell membrane
Some also have cell wall
Membrane bound organelles
specialization

3. Bacteria Morphology Feeding Oxygen pathways Decomposers Rods (bacilli)
Spheres (cocci)
Spirals
Feeding
Heterotrophic
Autotrophic
Photoautotrophic
Chemoautotrophic
Oxygen pathways
Aerobic
Anaerobic
Facultative anaerobic
Decomposers
Breakdown DOM
Ammonia → nitrate
N2 gas → NH4 → nitrate

4. Archaea Similar in shape and simplicity to Bacteria Extremophiles
Share some genetic similarities with Eukaryotes
Extremophiles
Temperature (>/= 121o)
Salinity pH
e.g. hydrothermal vents

5. Other fun marine microbes
Unicellular algae
Plant-like Protists
Mostly photosynthetic
Autotrophs converting light E to ATP
Primary producers
Planktonic
Drift in the water column

6. Diatoms: Phylum Bacillariophyta
Silicon shell = frustule
Glass-like
2 halves like a petri dish
Major planktonic 1o producer
Dead sink forming much of biogenous sediments

7. Diatom reproduction

8. Dinoflagellates “spinning flagellates”
Grooved perpendicular flagella
Some produce toxins (like some diatoms)
Poison accumulates in shellfish; poisons consumers
Red tides
Bioluminescent
Zooxanthellae
Photosynthetic symbionts of anemones and corals

9. All are important planktonic 1o producers
Chrysophyta
Silicoflagellates
Star shaped; silicon
Desmids
Pectin & silican walls
Golden or yellow
Coccolithorids
Calcium carbonate coccoliths
All are important planktonic 1o producers
Emiliania huxleyi (E. huxleyi)

10. Protozoans Animal-like protists Heterotrophs Unicellular or colonial
Various forms
Foraminiferans
Have a CaCO3 shell
Thin extended pseudopods
Planktonic or benthic
Adds to the calcareous sediments
Radiolarians
Silica shells; thin pseudopods; planktonic; silicious sediments
Ciliates
Aggregate shells or sand particles
Crown of cilia

11. Fungi Heterotrophic Decomposers Some parasitic Some symbiotic
Breakdown DOM
Some parasitic
Some symbiotic
w/ algae &/or cyanobacteria
= Lichens
Fungi provide structure & support (home); algae provides photosynthesis products (sugars)