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DO NOW • What is carrying capacity? • What happens when a population reaches carrying capacity? • The arrows in a food chain represent the… • For an ecosystem to be stable (in homeostasis), do you think there should be more producers or consumers? WHY? SATURDAY?? • 10am-3pm • 250 minutes of lab • Practice Regents Carrying Capacity • The maximum population of a species that can be supported by an ecosystem. • Resources are finite, so population growth is limited. • Once a population reaches the carrying capacity, the population will be in a state of dynamic equilibrium. Dynamic Equilibrium • When an ecosystem is balanced, or stable, the ecosystem is in a state of dynamic equilibrium. • Dynamic equilibrium is another name for homeostasis • DYNAMIC- moving/changing • EQUILIBRIUM- balance Stability of the Ecosystem • In every ecosystem, organisms are supported by other organisms in the food chain. • In order for food chains to be stable, there must be MORE producers than consumers • In ANY ecosystem, PRODUCERS are the most abundant organisms. • Plants support all other organisms directly or indirectly. • Plants directly support herbivores. • Plants indirectly support carnivores. • Without plants, there would be no herbivores • In order for a food chain to be stable, there must be more prey than predators • Prey support predators – Prey provide food energy for predators • Without prey, there would be no predators • The abundance (amount) of species in an ecosystem can be represented by a pyramid. • The arrows in food chains represent the transfer of energy • Energy flows through ecosystems in one direction • Energy starts as solar energy, which is converted into chemical energy in plants Water + Carbon Dioxide Glucose + Oxygen H2O + CO2 C6H12O6 + O2 Photosynthesis is the process that provides the ecosystem with vital energy • Energy in an ecosystem can also be represented in a pyramid. • In an ecosystem, producers have the most energy • Every time energy is transferred, energy is lost • The energy is lost when it is converted to ATP to run all cellular processes.