1. Human Impact Unit 3

2. Algae

3. Algae basics the base of the food chain (largest producer) produces 70-75% of O 2 for the earth’s atmosphere and earth’s water can be unicellular (1 cell) or multicellular

6. Normal algae cycle reproduce + create O 2 nutrients released by bacteria, reabsorbed by algae, cleans water, causes succession % die in winter, aerobic bacteria break down the dead material, use up O 2 algae grow, photosynthesize to create O 2 Plenty of O 2 for aquatic life, and releases into air

7. lakes/ponds are transformed

8. A healthy pond begins to have aquatic vegetation; other inhabitants die, increasing organic matter, and it becomes shallower.

9. possibly a marsh

10. Algae cycle + human impact = eutrophication eutrophication – too much algae, sometimes called “bloom” How humans add nutrients: 1.wastewater, septic 2.farming waste 3.fertilizer ( golf courses, residential ) 4.car washes, soap 5.composting ( leaves, grass ) → good thing

11. Algae reproduce + create O 2 nutrients released by bacteria, reabsorbed by algae, toxic stuff added, succession % die in winter, aerobic bacteria use up all of O 2 Too much algae grows, photosynthesize to create O 2 No O 2 left for fish and toxic gases Algae cycle + human impact = eutrophication Toxic anaerobic bacteria take over, create CH 4 and H 2 S Nutrients added by human activities Tons of dead algae

12. new bigger, deeper low nutrients low biodiversity cold, clear EX: great lakes old shallow warmer, cloudier green algae high nutrients high biodiversity EX: farm pond Classifying water sources

13. Eutrophication

18. Different Types of Algae green algae – contains chlorophyll a, b (green color) which captures light to create energy

19. brown algae – do photosynthesis, but use chlorophyll c (brown) – diatoms (unicellular) are similar

20. Diatoms – unicellular organisms with yellow-brown chloroplast that enables them to photosynthesize.

21. red algae – found in the oceans –use chlorophyll a, but have red pigment – sushi wraps, thickening agents (ice cream)