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Toxic and Harmful Algal Blooms “You Are What You Eat” Rudo Kashiri.

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Presentation on theme: "Toxic and Harmful Algal Blooms “You Are What You Eat” Rudo Kashiri."— Presentation transcript:

1 Toxic and Harmful Algal Blooms “You Are What You Eat” Rudo Kashiri

2 Learning Objectives Understand food chains and food webs Understand food chains and food webs Recognize the importance of and need for primary producers Recognize the importance of and need for primary producers Appreciate the interconnectedness and interdependence of organisms Appreciate the interconnectedness and interdependence of organisms

3 Activity In this simulation, predators “eat” their prey by tagging their prey’s elbow. In this simulation, predators “eat” their prey by tagging their prey’s elbow. Once an organism is “eaten,” it relinquishes its food bag to its predator and sits down in the feeding area. Once an organism is “eaten,” it relinquishes its food bag to its predator and sits down in the feeding area. During this time, the living krill can continue to graze on the algae. During this time, the living krill can continue to graze on the algae. There has been an algal bloom in the area There has been an algal bloom in the area

4 Who is in the food web? Krill Krill Fish Fish Seal Seal Killer Whale Killer Whale

5 Materials 1 pound of M&M regular candies 1 pound of M&M regular candies Plastic sandwich bags Plastic sandwich bags markers markers cut out “life cards” cut out “life cards” Rope Rope stopwatch or other timing device stopwatch or other timing device

6 Krill You came across an algal bloom and it’s a feeding frenzy! You only have limited time to graze before the current causes the bloom to dissipate. Grab everything that you can to get those needed nutrients! You have seconds to “graze

7 Fish You came across a swarm of krill feeding on an algal bloom. You have just finished eating a bunch of copepods along the coast, so you aren’t very hungry. You eat only 1 of the krill. Enter the feeding area and do what is indicated on your “Life Card.”

8 Seals You came across a school of fish feasting on Krill. Do what is indicated on your “Life Card.”

9 Killer Whale You came across a group of seals feasting on a school of fish. You were successful at catching one of them for your afternoon meal. Enter the feeding area and accomplish what is indicated on the killer whale “Life Card.”

10 Share your “Life Cards” Krill Krill Fish Fish Seal Seal killer whale killer whale

11 Toxic algae All red and orange M&M’s are toxic algae! All red and orange M&M’s are toxic algae! Count the total number of M&M’s collected Count the total number of M&M’s collected Check and sort your food. Check and sort your food. Number of red and orange M&M’s collected. Number of red and orange M&M’s collected. calculate the amount of toxic algae consumed as a percent of the total consumption. calculate the amount of toxic algae consumed as a percent of the total consumption. 100 x [# red + # orange]/[total #] 100 x [# red + # orange]/[total #]

12 Who is alive

13 toxic algae consumed Krill fish seals whale Organism Toxic algae consumed Krill Fish Seals Whale Data collection

14 Conclusions What can we do to reduce use of toxins, or keep them out of the food chains? What can we do to reduce use of toxins, or keep them out of the food chains? How did you feel when you heard that the red and orange M&Ms were toxic? How did you feel when you heard that the red and orange M&Ms were toxic? How can you use this activity with your students? How can you use this activity with your students?


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