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AIM: SWBAT identify different roles within a food web

AIM: SWBAT identify different roles within a food web. Please Do Now: Write down what you eat in a typical day. Then write down whether you are best described as a producer, a primary consumer, a secondary consumer, a tertiary consumer or even higher. Agenda. Do now Food Webs Data Analysis

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AIM: SWBAT identify different roles within a food web

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  1. AIM: SWBAT identify different roles within a food web Please Do Now: Write down what you eat in a typical day. Then write down whether you are best described as a producer, a primary consumer, a secondary consumer, a tertiary consumer or even higher.

  2. Agenda Do now Food Webs Data Analysis Cladistics Activity Lion vs. Elephant Video

  3. What are the shortcomings of representing energy flow through ecosystems as a pyramid? • The energy flow through ecosystems is staggeringly more complex than a simple pyramid • Most organisms do not fit neatly into a given trophic level, since most organisms have lots of things in their diet.

  4. Except for… • For what kind of organisms is placing them in their trophic level (almost) always simple and straightforward?

  5. What is more realistic? • To show as many of the trophic interactions in an ecosystem as possible, we use “food webs” • Arrows point from an organism that gets eaten to what it gets eaten by

  6. Carnivores vs. herbivores • Basic terms for meat-eaters and plant-eaters • Carnivores = meat eaters • Herbivores = plant eaters

  7. Data Analysis You will be a presented a series of graphs and charts (every Thursday) For each chart or graph, on a blank sheet of paper you will answer 1-2 questions. Once we have gone through all of them, you will be posed a question that unifies all the figures. Respond in 3-4 sentences.

  8. Data Analysis: Trophic Level vs. Tissue Mercury Concentration • 1. What is being measured on the y- axis? • 2. What are the categories on the x axis? • 3. What organisms have higher concentrations of Mercury in their bodies?

  9. Data Analysis: PCB Concentration in the Lake Ontario Food Web • 1. What is the concentration of PCBs in the water of the Lake? • 2. What is the concentration in the bed sediments? • 3. What eats mysids? • 4. What are the PCB levels in trout/salmon?

  10. Data Analysis: CFC tissue concentrations in Arctic animals • 1. What are on the x and y axes on this graph? • 2. Which organism has the highest concentration of pollutants in its tissues?

  11. Unifying question What is the overall relationship between trophic level and concentration of pollutants in the tissues of organisms? How should this influence what humans decide to eat from polluted areas/ecosystems (they are all polluted)?

  12. Which of the following organisms is a producer? • Water fleas • Tadpoles • Algae • Large Fish

  13. Which of the following organisms is a primary consumer? • Water fleas • Turtles • Algae • Large Fish

  14. Which of the following organisms is a tertiary consumer? • Water fleas • Tadpoles • Algae • Large Fish

  15. Which of the following populations probably contains the largest number of organisms? • Water fleas • Tadpoles • Algae • Large Fish

  16. Which of the following organisms is a secondary consumer? • Water fleas • Small fish • Algae • Turtles

  17. Which of the following populations probably contains the smallest number of organisms? • Water fleas • Tadpoles • Algae • Large Fish

  18. Which of the following organisms is an autotroph? • Water fleas • Tadpoles • Algae • Large Fish

  19. Which of the following organisms is a heterotroph? • Water fleas • Tadpoles • Algae • A and B

  20. Which of the following organisms is a herbivore? • Small Fish • Tadpoles • Algae • Large Fish

  21. Which of the following organisms is a carnivore? • Water fleas • Tadpoles • Algae • Large Fish

  22. What would happen to the turtle population if small fish were removed? • Increase • Decrease • Stay the same

  23. What would happen to the tadpole population if large fish were added? • Increase • Decrease • Stay the same

  24. If there are 20,000 calories available on the primary consumer level, how many are available on the secondary consumer level? • 200,000 cal • 20,000 cal • 2,000 cal • 200 cal

  25. If there are 20,000 calories available on the primary consumer level, how many are available on the producer level? • 200,000 cal • 20,000 cal • 2,000 cal • 200 cal

  26. Imagine you are on a spaceship to another galaxy. The spaceship is very large, and there are 10 total astronauts. The trip will last 50 years, so NASA has built a large field in the middle of the spaceship where you can grow things like corn, wheat, tomatoes and rice. The field can provide 8,000,000 calories a year. You also have 4 chickens and 2 foxes. You can breed these animals to increase the population. NASA is allowing you to decide what you would like to eat over the next 50 years. You need 6,000,000 calories a year to keep all ten astronauts alive. Would you: • Eat all the corn, wheat, tomatoes and rice? • Feed the corn, wheat, tomatoes and rice to the chickens and eat the chickens? • Feed the corn, wheat, tomatoes and rice to the chickens, feed the chicken to the foxes and eat the foxes?

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