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        3-5, 13+

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        Oregon | Activity 3.4: Decreasing Salmon Populations - Causes and Effects

        Students watch a video about the current salmon depletion and learn that Oregon’s Native Peoples who used to survive on salmon that they fished now must buy salmon because there are too few to fish. Students watch a second video about how warming water is killing salmon eggs, which contributes to the depletion of salmon. They then answer questions and complete a graphic organizer on the causes and effects of salmon depletion. 

        Lesson Summary

        Students watch a video about the current salmon depletion and learn that Oregon’s Native Peoples who used to survive on salmon that they fished now must now buy salmon because there are too few to fish. Students watch a second video about how warming water is killing salmon eggs, which contributes to their depletion. They then answer questions and complete a graphic organizer on the causes and effects of salmon depletion. 

        This lesson is part of "Great States: Oregon | Unit 3: Native Peoples." In this unit, students explore the cultures of Oregon’s Native Peoples population, as well as the interactions of Native groups with others who have come to Oregon.

        Time Allotment

        10 minutes

        Learning Objectives

        Standards: 

        4.9: Explain the influence of Oregon and the Northwest’s physical systems on humans, including Native Americans. 

        4.11: Identify conflicts involving use of land, natural resources, economy, and competition for scarce resources, different political views, boundary disputes, and cultural differences within Oregon and between different geographical areas.

        Supplies

        Directions

        1. Explain that salmon are one of the foods that have sustained Native Peoples life throughout history. People have canned salmon for winter’s food supply and as a means of work. Salmon are also important food for other local wildlife, such as bears, larger fish, and birds of prey.

        1. Distribute the Impacts of Climate Change on Salmon Populations handout and instruct students to take notes on how past overfishing and present reduced salmon populations have economic and lifestyle impacts while watching the video.

        1. Play the video, Salmon Population Depleted. [2:15]

        1. Explain to students that even small changes in the climate can affect the ecosystem. Tell students they will be watching a video about how a change in water temperature affects salmon eggs, which in turn affects the livelihood of Native Peoples. This issue is just one of the multiple effects of climate change.

        1. Instruct students to take notes on how rising water temperatures are affecting the ecosystem while watching the second video.

        1. Play the video, Warmer Water Kills Salmon Eggs. [3:05]

        1. Have students answer questions on the handout and then complete the causes and effects of salmon depletion flowchart.

        Answer Key:

        1. There were so many salmon fished and caught that they couldn’t can them all; they had to throw some back into the water. But now there aren’t enough salmon to catch for survival.

        2. Restoring the balance in nature [video 1, 0:53].

        3. Eggs are not surviving due to the increase in water temperature [video 1, 1:35].

        4. Answers will vary, but can include: reduced number of salmon eggs means fewer salmon, fewer salmon for other animals including humans to eat.

        5. Answers will vary, but should include: less diversity in nature, less diversity in food sources as animals/plants can’t adjust to the changing climate.

        6. Ecosystem flowchart

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