Foodweb chainpp (1)

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  • 1. Relationships: Symbiosis = Living Together a) commensalism b) mutualism c) parasitism
  • 2. Energy Flow (Trophic Levels)  Producers- make their own food  Consumers- get energy from consuming producers
  • 3. Producers   Producers- capture energy from sunlight or chemicals and use the energy to produce food. Producers are autotrophs- they make food from their environment
  • 4. 2 main types of autotrophs  One type gets energy from the sun-by photosynthesis  Another type gets energy without light- by chemosynthesis
  • 5. Consumers  Consumers are heterotrophs- get energy from other organisms
  • 6. Types of Consumers     Herbivores- eat only plants Carnivores- eat animals Omnivores- eat both plants and animals Scavengers- eat dead matter (plants and animals)
  • 7. Feeding Relationships  Energy flows through an ecosystem in one direction from: – 1. the sun – 2. To autotrophs – “self” “feeder” (producers) – 3. To heterotrophs – “other” “feeder”   Consumers Decomposers get energy from decomposing dead organisms
  • 8. Food Chain- a series of steps in which organisms transfer energy by eating or being eaten.
  • 9. Food Web
  • 10. They can become very complex…
  • 11. Trophic levels  Each step in a food chain or a food web is called a trophic level. – Producers are the first trophic level – Consumers are the second, third, or higher trophic level  Each trophic level depends on the one below for energy
  • 12. Energy Losses  Why do we need food? – Movement – Thought – Heat  Some energy is lost at each step – Do deer need energy for these things? – Do plants? – Do fish? Giraffes? Ticks? Energy is lost at EVERY STEP.  Limits the number of trophic levels in an ecosystem  Energy flow is a one way path! (not a cycle) 
  • 13. Energy Pyramid   Only part of the energy stored in one level can be passed to the nextmost energy is consumed for life processes (respiration, movement, etc., and heat is given off) Only 10% of the energy available within one trophic level is transferred to organisms in the next trophic level
  • 14. Biomass Pyramid   Biomass- the total amount of living tissue within a given trophic level. A biomass pyramid represents the amount of potential food available for each trophic level in an ecosystem.
  • 15. All Heat in the End  At each trophic level, the bulk of the energy received from the previous level is used in metabolism  This energy is released as heat energy and lost to the ecosystem  Eventually, all energy is released as heat