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The Distribution and Abundance of the Non-native Eelgrass Zostera japonica in Oregon Estuaries Chana Dudoit Mentor: D

The Distribution and Abundance of the Non-native Eelgrass Zostera japonica in Oregon Estuaries Chana Dudoit Mentor: Dr. Sylvia Yamada Zoology Dept. Zostera marina. Zostera japonica. The Importance of Eelgrass Meadows in an Estuary. Nursery for juvenile fish. Foraging habitat. prey.

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The Distribution and Abundance of the Non-native Eelgrass Zostera japonica in Oregon Estuaries Chana Dudoit Mentor: D

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  1. The Distribution and Abundance of the Non-native Eelgrass Zostera japonica in Oregon Estuaries Chana Dudoit Mentor: Dr. Sylvia Yamada Zoology Dept.

  2. Zostera marina Zostera japonica

  3. The Importance of Eelgrass Meadows in an Estuary Nursery for juvenile fish Foraging habitat prey Commercial industries Nutrient cycling

  4. First Introduction: Seed oyster industry Used as packaging material Washington State 1950’s

  5. How is it transported? Waves ~plants are carried in the currents Birds ~seeds are eaten Ships ~plants were used as packaging material People ~accidental or purposefully moved ~attached to boat motors

  6. Distribution of Eelgrass Pacific Northwest Low Tide

  7. Distribution of Eelgrass Pacific Northwest

  8. Z. Japonica Netarts Bay Low Tide Importance of mapping • Comparative analysis of Z. japonica expansion • Effect on habitat composition • Change in species composition and abundance

  9. Species Composition

  10. Stabilize substrate

  11. Habitat degradation

  12. Study Sites: • Netarts Bay • South Slough National Estuarine Research Reserve (SSNERR) • Bandon Marsh National Wildlife Refuge

  13. 1-24% 25-49% 50-74% 75-100%

  14. Penetrometer: measures the density of a substrate

  15. Netarts Bay

  16. >75% 50-74% 25-49% 1-24% Small isolated patches Percent Cover of Z. japonica in Netarts Bay 2005

  17. South Slough National Estuarine Research Reserve (SSNERR)

  18. Percent Cover of Z. japonica in South Slough National Estuarine Research Reserve >75% 50-74% 25-49% 1-24% Small isolated patches 1984 2004 2005

  19. Bandon Marsh National Wildlife Refuge

  20. Percent Cover of Z. japonica in Bandon Marsh National Wildlife Refuge, 2005 >75% 50-74% 25-49% 1-24% Small isolated patches

  21. Discussion: • Developing technologies • Aerial photographic surveys using • true color (TC) film • false-color near-infrared (color infrared, CIR) film

  22. Acknowledgments: Dr. Sylvia Yamada, Zoology Dept. OSU Dr. Samuel Chan, Oregon Sea Grant, OSU Dr. David Young, EPA Newport Derek Sowers, SSNERR Scott Growth, DFW Chelsea Dudoit, volunteer

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