Transcript Food webs
Essential Questions • What are the implications of interconnectedness? • How does understanding interconnectedness affect perception? st 1 law & food webs 1st Law: Everything is connected to everything else Making connections: 1. What is the connection between the rise of McDonalds outlets in China and the massive deforestation in the Amazon forest in Brazil? 2. Take the Carbon footprint test: http://footprint.wwf.org.uk/ How do your actions impact others? How can you reduce your impact? http://footprint.wwf.org.uk/ 1) How do your actions impact others? 2) How can you reduce your impact? Activity: Web Game PART 1: Getting organized 1. Get assigned card or go to http://www.mhhe.com/biosci/genbio/virtual_l abs_2K8/pages/ModelEcosystems.html 2. On your island work together to figure out: 1. 2. What is your role in nature? How can you survive? 3. Discuss vocabulary. 4. As a class, group yourselves according to similarities based on your role in nature. Autotroph / primary producer • Makes it’s own food (glucose) from primary energy source (sun or deep-sea thermal vents) – Use photosynthesis or chemosynthesis – PPP: A plant = producer = photosynthesis Tree’s Mass Video: http://www.youtube.com/watch?v=2KZb2_vcNTg&feature=yo utu.be Heterotroph/ consumer • Cannot make their own food • Must eat other living organisms http://scratch.mit.edu/projects/mrshart/933775 THE TROPHIC PYRAMID Herbivore or primary consumer • Eat producers – Folivore (leaves) – granivore (seed) – necativore (nectar) – xylophage (wood) - frigivore (fruit) - mucivore (sap) -palynivore (pollen) Secondary- quarternary consumers • Eat consumer level below them – Carnivore = meat-eaters – Omnivore = eat animals and plants (like 1⁰ consumers do) • Predator- the animal doing the hunting & eating • Prey- the animal being hunted & eaten Top/ Apex predator • The top-end of the food chain • Is not eaten by anything else (is not prey) because it has little/no natural enemies* * Humans often not consider natural enemies Detritivores • Eat detritus: plant and animal remains, shed parts (skin, antlers, leaves), and wastes • Scavengers- detritivores that specialized in carrion (dead animal bodies) or other animal wastes Decomposers (aka saprotrophs) • Help speed up the decaying process return matter (to the soil) to be reused • digest food outside their bodies – Fungi eat the dead matter by releasing acid found in their body to melt the decaying material, then sucking in all the acid, along with the melted material Cool fact: A gram of soil typically contains 40 million bacterial cells, and the bacteria on Earth form a biomass that exceeds that of all living plants and animals PART 2: Making the web Individual Goal: Find a way to survive 1. Using string, connect yourself to all possible food sources e.g. horse eats the grass grass “eats” the sun (string connects horse to grass and same string connects grass to sun; cut string to indicate end of chain) Note: Use 1 string per food source The difference between webs and chains top predator Food chain vs. Food webs Chain = the path of food energy transfer from ONE producer to it’s primary, secondary and top consumer Web = the interconnection of all the food chains put together PART 2: Making the web Individual Goal: Find a way to survive 1. Using string, connect yourself to all possible food sources e.g. horse eats the grass grass “eats” the sun (string connects horse to grass and same string connects grass to sun; cut string to indicate end of chain) Note: Use 1 string per food source REFLECTION: What are the implications of interconnectedness? 1. What happens when one species is removed? a. producer b. consumer-omnivore/ carnivore/ herbivore c. decomposer 2. What happens when changes with the “SUN” happens? 3. Connect to your e-column (in back of notebook) SOME GLOBAL ISSUES Pollution Deforestation Biodiversity Conservation Endangered Species Renewable Energy Global Warming Ozone Depletion Soil Degradation G M Food Urbanization Pesticides Hazardous Waste WaterFish Depletion Invasive Species Poverty Natural Disaster Prevention Global Infectious Diseases • Following slides to use for web game sun, grasshopper, robin, grass, hawk, quail, mouse, worm, rabbit, caribou, flea, owl, wheat, tick, fox, weeds, coyote, mushrooms, bacteria, vulture, elephant, tree, hyena, zebra, cheetah, termite, lion, snake lion grasshopper sparrow grass dung beetle hawk rat rabbit flea worm wildebeest owl tick fox termite snake mushrooms bacteria vulture elephant acacia hyena zebra cheetah Just for teacher reference http://www.enchantedlearning.com/subjects/foodchain/