Topic-5.-ENERGY-Flow-through-ecosystems.pptx

ENERGY FLOW THROUGH ECOSYSTE MS KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem. Food chain A MODEL THAT SHOWS A SEQUENCE OF FEEDING RELATIONSHIPS.  A food chain links species by their feeding relationships.  A food chain follows the connection...

ENERGY FLOW THROUGH ECOSYSTE MS KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem. Food chain A MODEL THAT SHOWS A SEQUENCE OF FEEDING RELATIONSHIPS.  A food chain links species by their feeding relationships.  A food chain follows the connection between one producer and a single chain of consumers within an ecosystem. GRAMA GRASS DESERT COTTONTAIL HARRIS’S HAWK  Consumers are not all alike. – Herbivores eat only plants. – Carnivores eat only animals. – Omnivores eat both plants and animals. – Detritivores eat dead organic matter. – Decomposers are detritivores that break down organic matter into simpler compounds. carnivore decomposer  Specialists are consumers that primarily eat one specific organism or a very small number of organisms. Generalists are consumers that have a varying diet.  Trophic levels are the nourishment levels in a food chain. – Producers/autotrophs produce their own food – Primary consumers are herbivores that eat producers. – Secondary consumers are carnivores that eat herbivores. – Tertiary consumers are carnivores that eat secondary consumers. A FOOD WEB SHOWS A COMPLEX NETWORK OF FEEDING RELATIONSHIPS. An organism may have multiple feeding relationships in an  ecosystem.  A food web emphasizes complicated feeding relationships and energy flow in an ecosystem. KEY CONCEPT Pyramids model the distribution of energy and matter in an ecosystem. AN ENERGY PYRAMID SHOWS THE DISTRIBUTION OF ENERGY AMONG TROPHIC LEVELS.  Energy pyramids compare energy used by producers and other organisms on trophic levels. Only 10 percent of the energy at each tier is transferred from one trophic level to the next. energy lost energy transferred OTHER PYRAMID MODELS ILLUSTRATE AN ECOSYSTEM’S BIOMASS AND DISTRIBUTION OF ORGANISMS.  Biomass is a measure of the total dry mass of organisms in a given area. tertiary 75 g/m2 consumers 150g/m2 secondary consumers primary consumers 675g/m2 producers 2000g/m2 2000g/m2 producers  A pyramid of numbers shows the numbers of individual organisms at each trophic level in an ecosystem. 5 tertiary consumers secondary 5000 consumers primary 500,000 consumers producers producers 5,000,000 A vast number of producers are required to support even a few top level consumers.