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Organizing the diversity

Systematics; studying the diversity Taxonomy to classify organisms & groups. Organizing the diversity. Prokaryotic Bacteria and bacteria-like Simpler Smaller cell size DNA without nucleus Cell wall & other crude protective layers Lack organelles Eukaryotic

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Organizing the diversity

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

  2. 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 Domains Bacteria & Archaea Domain Eukarya

  3. Morphology 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 Bacteria

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

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

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

  7. Diatom reproduction

  8. “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 Dinoflagellates

  9. 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. 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 Protozoans

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

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