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The Science Behind Sustainable Seafood: Solving the Ecosystem Problem

Explore the effect of removing a primary food source in Alaskan waters and understand the interconnectedness of organisms in a food web. Learn about the Bering Sea ecosystem and the importance of maintaining balance within the entire ecosystem.

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The Science Behind Sustainable Seafood: Solving the Ecosystem Problem

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  1. Science Behind Sustainable Seafood • Solving the Ecosystem Problem • Alaska Fisheries Science Center

  2. What is the effect of removing a primary food source in Alaskan waters?

  3. Organisms are interconnected by what they consume.

  4. Free write Write down what comes to your mind when I say the word food web. Underline three things you wrote which are important to a food web http://www.afsc.noaa.gov/REFM/REEM/Manuals/Default.htm

  5. Krill video http://jonbowermaster.com/blog/2009/01/krill-baby-krill/ http://video.nationalgeographic.com/video/animals/invertebrates-animals/crabs-lobsters-shrimp/krill/ What animals ate krill in the video? Describe a food chain they saw in the video How does a food web differs from a food chain?

  6. Parts of the Bering Sea ecosystem • The sun’s energy is converted into nutrients for plants through a process called photosynthesis. • Phytoplankton are microscopic plants that drift in the ocean. They are at the base of all food chains in the Bering Sea • Zooplankton are microscopic animals and are found near the bottom of the Bering Sea food chain. • Zooplankton like amphipods and copepods are prey to many small fish. • Big baleen whales eat zooplankton (Humpback whales)

  7. Parts of the Bering Sea ecosystem • Small fish like herring and juvenile walleye pollock can be both predator and prey since they sit in the middle of the food chain. • Feed on zooplankton • Adult walleye pollockcan also be both predator and prey. they are not the top predator. • Feed on krill and juvenile pollock • Humansare at the top of the food chain. • In the Bering Sea, northern fur seals are also a top-predator • Feed on walleye pollock, Atka mackerel and Pacific cod

  8. Stomach data To better understand the relationships between predators and prey in the Bering Sea, scientists at the Alaska Fisheries Science Center annually collect and examine the stomachs of thousands of fish. What they see tells them a lot about how important all species in the Bering Sea are to maintaining balance within the entire ecosystem.  http://www.afsc.noaa.gov/REFM/REEM/Manuals/Default.htm

  9. WALLEYE POLLOCK STOMACH DATA http://www.afsc.noaa.gov/species/pollock.php

  10. PACIFIC COD STOMACH DATA http://www.afsc.noaa.gov/species/Pacific_cod.php#

  11. http://www.dfw.state.or.us/MRP/finfish/sp/flatfish.asp ARROWTOOTH FLOUNDER STOMACH DATA

  12. FLATHEAD SOLE STOMACH DATA http://www.dfw.state.or.us/MRP/finfish/sp/flatfish.asp

  13. Stomach Data Discussion WALLEYE POLLOCK, PACIFIC COD, ARROWTOOTH FLOUNDER, FLATHEAD SOLE • Which animals have similar diets? • Which prey species occurs in all of the diets? • Which prey species occurs in most of the diets? • Which predator has the most different or specialized diet?

  14. Why do you think a predator has multiple types of prey?

  15. What advantages would more prey types in a diet give an animal? • Do Pacific cod eat the same prey in all 3 places? • Do cod eat the most of the same prey in all 3 places?

  16. Make your own food web

  17. http://www.sciencedirect.com/science/article/pii/S096706450700197Xhttp://www.sciencedirect.com/science/article/pii/S096706450700197X http://access.afsc.noaa.gov/REEM/WebDietData/DietTableIntro.php

  18. Bering Sea Ecosystem

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