Lesson 6.3 Ecosystems

Lesson 6.3 Ecosystems

Lesson 1.3: Ecological Food Webs Organizational Levels of Ecology: 1. Biosphere: the entire planet, including the land, ocean, and atmosphere, and all living things = WORLD 2. Biome: a group of ecosystems that share similar climates and organisms = COUNTRY 3. Ecosystem: a group of communities

with interacting organisms through which energy is transferred = STATE Organizational Levels of Ecology: 4. Community: a collection of different populations living and interacting within an ecosystem = TOWN 5. Population: a group of individuals (same species!) that live and interact within a community = HOUSE

6. Species: a single organism = INDIVIDUAL *Words in RED are the most important levels to study! Energy Table: *Copy this table! Type of Organism Energy

Source Example Autotroph/Producer Photosynthesi s

Giraffe Autotroph/Producer Chemosynthes is Heterotroph/ Consumer Cellular Respiration

Bacteria Human Ways to Get Energy: Producers are organisms capable of making their own food They can accomplish this two ways:

1. Photosynthesis: Carbon dioxide + water + sunlight = oxygen + sugar 2. Chemosynthesis: Carbon dioxide + water + hydrogen sulfide = oxygen + sugar + sulfur Ways to Get Energy: Consumers are organisms that must eat to get their

energy All heterotrophs accomplish this one way: 1. Cellular Respiration: Converts food and oxygen into energy Oxygen + sugar = carbon dioxide + water + energy (*the opposite of photosynthesis!) Ways to Get Energy:

*Only copy what you dont already know, but you will be tested on them ALL! 1. Herbivore: eats plants (ex. Giraffe) 2. Carnivore: eats meat (ex. Great White Shark) 3. Omnivore: eats plants & meat (ex. Human) 4. Decomposer: break down dead/decaying material and release energy back into the ecosystem (ex. Bacteria) 5. Detritivore (or Scavenger): feed on broken down

dead/decaying material to consume energy for themselves (ex. Vulture) Energy Flow: A food chain is a single series of steps in which organisms transfer energy by eating and being eaten. The arrows point to WHO gets the energy/food! *An example from the Florida Everglades is shown.

Energy Flow: A food web is a network of multiple feeding interactions within an ecosystem. *An example from the Antarctic Ocean is shown. Energy Flow: Ecological Pyramids show the amount of energy contained within each trophic level within a food chain or web

Primary producers will always be the 1st level Consumers will be all of the next levels above

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