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Food chains and_productivity_modified.9582023
- 1. Food Web dynamics and Productivity movement in ecosystems Big Idea 4: Biological Systems Interact
- 2. Essential Knowledge •4.A.6: Interactions among living systems and with their environment result in the movement of matter and energy.
- 3. Energy Flows in Ecosystem Producers Consumers Decomposers
- 4. Producers: PhototroPhs • Use sun to produce sugar (PS) • Plants, Algae (Phytoplankton), Bacteria • PS is 1 % efficient!
- 5. • Use H2S to produce sugars (chemosynthesis) • Bacteria Producers: chemotroPhs
- 6. consumers: heterotroPhs • Break down stored sugars (aerobic respiration) • C6H1206 + 6H2O + 6O2 6CO +12H O+ Energy (36 ATP)
- 7. simPliFied Food chain • Primary producers get eaten by….
- 8. • Primary consumers get eaten by… simPliFied Food chain
- 9. simPliFied Food chain • Secondary consumers get eaten by…
- 10. Simplified food Chain • Tertiary consumers get eaten by…
- 14. Importance of Decomposers • Make vital elements available to primary producers. Convert organic material into inorganic materials (producers can use in soil/ H2O)
- 15. Food Chains and Webs • Are dependent upon primary productivity!!!
- 16. Gross Primary Productivity (GPP) •Rate at which energy is captured during PS and stored. HIGH LOW
- 17. Net Primary Productivity (NPP) • Energy that remains in producers after respiration; biomass available to consumers • NPP = GPP - Resp. Energy that is available to consumers!
- 19. Keystone Species! • Connected to many species in the food web. • Removal causes trophic cascade. • Ex: Sea Otter
- 21. EnErgy Flows, But MattEr is rEcyclEd! BiogEochEMical cyclEs: c, n, and watEr
- 24. Nitrogen Cycle Video Clip • Study Jams
- 25. Interactions Among Organisms Symbiosis: relationship b/t 2 species •Mutualism (+,+) •Commensalism (+,0) •Parasitism (+,-)
- 26. Mutualism • Both Species Benefit • Rhinos and
- 29. Mycorrhizae• Symbiotic fungus found on plant roots •Aids in water retention, mineral uptake (nitrates) W/out M With M
- 30. Commensalism • One member is helped, the other neither benefits or is harmed • Cows and Cattle Egrets
- 31. Parasitism • + and - relationship •parasite benefits, host loses •parasite usually smaller than host Leech Bite, Thailand Lamprey
- 32. Endoparasites • Parasites that live within the body of the host! • Ex. Tapeworm…
- 33. Ectoparasites • Parasites that feed on the external surface of the host. • Ex: ticks
- 34. Competition • Orgs attempting to use the same scarce resources in same ecosystem.
- 35. Intraspecific Competition • Between SAME species
- 36. Interspecific Competition • Competition between DIFFERENT species