Mentor: Dr. Sylvia Yamada

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Presentation transcript:

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.

Zostera marina Zostera japonica

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

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

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

Distribution of Eelgrass Pacific Northwest Low Tide

Distribution of Eelgrass Pacific Northwest

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

Species Composition

Stabilize substrate

Habitat degradation

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

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

Penetrometer: measures the density of a substrate

Netarts Bay

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

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

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

Bandon Marsh National Wildlife Refuge

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

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

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