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Mentor: Dr. Sylvia Yamada

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Presentation on theme: "Mentor: Dr. Sylvia Yamada"— Presentation transcript:

1 Mentor: Dr. Sylvia Yamada
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 Native eelgrass, Zostera marina provides invaluable habitat to a multitude of native fishes and invertebrates, as well as numerous species of prey including small crustaceans, bivalves, and gastropods. 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 Birds Ships People
~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 Importance of mapping Comparative analysis of Z. japonica expansion
Effect on habitat composition Change in species composition and abundance Z. Japonica Netarts Bay Low Tide

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

16 Netarts Bay

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

18 Estuarine Research Reserve (SSNERR)
South Slough National Estuarine Research Reserve (SSNERR)

19 1984 2004 2005 Percent Cover of Z. japonica in
South Slough National Estuarine Research Reserve 50-74% 25-49% 1-24% >75% Small isolated patches 1984 2004 2005

20 Bandon Marsh National Wildlife Refuge

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

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

23 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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