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Activity 16

Activity 16. Ecosystems Out of Balance.

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Activity 16

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  1. Activity 16 Ecosystems Out of Balance

  2. LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the Science and Global Issues SEPUP course to customize the unit to match their students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of Science and Global Issues within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size. DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of Science and Global Issues or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis.

  3. What do you think population levels would look like if you graphed them for an ecosystem that had no pressure from fisheries?

  4. What do you expect to happen to the graph if an important species within the ecosystem were overfished? • If the fishery were sustainable, would you expect the same results?

  5. Pacific Halibut Population

  6. Pacific Halibut Food Chain

  7. Pacific-halibut-dominated Ecosystem

  8. Read the introduction. • Based on what you have seen, do you think this is a sustainable fishery? What indicators are you looking at to determine this?

  9. What would you expect to be different on a population graph for an ecosystem of a fishery that is not sustainable?

  10. Challenge • How does information about relationships among organisms help to determine the sustainability of a species and an ecosystem?

  11. As you analyze the graphs, start with the population that is being fished, then work up or down the food chain. • Pay close attention to any factors in Part B that might influence population levels.

  12. What else might cause these population changes besides overfishing?

  13. Why do you think that the practices used by the Pacific halibut fishery are not followed by all other fisheries?

  14. Would it change your answer if you knew that the Pacific halibut fishery operates near shore, and only in the United States and Canada?

  15. Analysis 5 • Choose one of the four ecosystems, and in your role as a fisheries scientist, explain to the people who run the fishery what you think is happening in the ecosystem. Citing evidence from the graph and from the history of the fishery, write a summary that explains what is happening in the ecosystem. Include in your summary: • A. your explanation of whether you think the fishery is sustainable • B. what changes in the ecosystem indicate that the fishery is or is not sustainable • C. how the overall biodiversity of the ecosystem has been affected • D. what advice you would provide about making the fishery sustainable, based on the other fisheries in this activity.

  16. Revisit the Challenge • How does information about relationships among organisms help to determine the sustainability of a species and an ecosystem?

  17. Key Vocabulary • fishery • invasive species • population • population growth rate • sustainability

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