13 4 Food Chains And Food Webs KEY

13. 4 Food Chains And Food Webs KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem.

13. 4 Food Chains And Food Webs Notice the arrows. Are they pointing in the right direction? GRAMA GRASS DESERT COTTONTAIL HARRIS’S HAWK Why would the arrows be pointing in this direction?

13. 4 Food Chains And Food Webs The arrows point in the direction that energy flows!!!! GRAMA GRASS DESERT COTTONTAIL The Desert Cottontail gets its energy FROM the Grama grass HARRIS’S HAWK The Harris’s Hawk gets its energy FROM the rabbit

13. 4 Food Chains And Food Webs • A food chain is a model that shows a sequence of 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

13. 4 Food Chains And Food Webs • A food web emphasizes complicated feeding relationships and energy flow in an ecosystem. ENERGY

Arctic Marine Food Web

African Grassland Ecosystem

Desert Ecosystem

Wetland Ecosystem

Chaparral Food Web

Temperate Forest Ecosystem

Pg. 410 Create-A-Food Web Must have a title Producers must form the base of the web Arrows show direction of energy flow Organisms must have multiple feeding relationships • Label each organism (Bird, wolf…) • Label producers/consumers • •

Food Web: Bill Nye (21 m)

13. 4 Food Chains And Food Webs At your table please describe these types of consumers: • Herbivores? • Carnivores? • Omnivores? • Detritivores? –Decomposers?

13. 4 Food Chains And Food Webs • Consumers are not all alike. – Herbivores eat only plants. Ex: grasshopper – Carnivores eat only animals. Ex: Lion – Omnivores eat both plants and animals. Ex: Bears – Detritivores eat dead organic matter, including feces (not including scavengers) – Ex: Worms, slugs, sea stars, some flies, millipedes – Decomposers are detritivores that break down organic or dead matter into simpler compounds. Ex: bacteria, Fungi carnivore

13. 4 Food Chains And Food Webs • Specialists are consumers that primarily eat one specific organism (they only eat one thing) Ex: Bamboo is 99% of a panda’s diet • Generalists are consumers that have a varying diet (they eat a lot of different things) Ex: Gray wolf eats elk, moose, deer, and mice

13. 4 Food Chains And Food Webs • Trophic levels are the nourishment levels in a food chain.

13. 4 Food Chains And Food Webs Tertiary consumers: Carnivores that eat carnivores Ex: owl eating a mole ENERGY Secondary consumers: Carnivores that eat herbivores Ex: mole eating a grasshopper Primary consumers: Herbivores that eat producers Ex: grasshopper eating grass Producers: Produce their own food Ex: plants

13. 4 Food Chains And Food Webs Omnivores, such as humans that eat both plants and animals, may be listed at different trophic levels in different food chains. • If you are eating a salad you are…. ? • a primary consumer (omnivore eating a producer) • If you are eating a hamburger you are…. ? • a secondary consumer (omnivore eating a herbivore) • If you are eating shark soup, you are…. ? • a tertiary consumer (omnivore eating a carnivore)

13. 4 Food Chains And Food Webs Balance Within A Food Chain (4 m 14 s)

Finish: Create-A-Food Web Pg. 410 • Color code and label if it is a producer and/or type of consumer MUST HAVE A KEY!!! – Producer – Primary consumer – Secondary consumer – Tertiary consumer

Homework Create-A- Trophic Level Pyramid Pg. 86 (On your own) • Think of an example of a food chain • Create a trophic level pyramid using this food chain • Include an Example of a(n): – producers – primary consumers – secondary consumers – tertiary consumers • Make it realistic!