the distribution and abundance of the non-native eelgrass zostera japonica in oregon estuaries chana...
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The Distribution and Abundance of the Non-native Eelgrass Zostera japonica in Oregon Estuaries
Chana Dudoit
Mentor: Dr. Sylvia Yamada
Zoology Dept.
The Importance of Eelgrass Meadows in an Estuary
Nursery for juvenile fish
Foraging habitat
Commercial industries Nutrient cycling
prey
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
•Comparative analysis of Z. japonica expansion
•Effect on habitat composition
•Change in species composition and abundance
Z. Japonica Netarts Bay Low Tide
Netarts Bay
South Slough National Estuarine Research Reserve (SSNERR)
Bandon Marsh National Wildlife Refuge
1984 2004 2005
50-74%
25-49%
1-24%
>75%
Small isolated patches
Percent Cover of Z. japonica in
South Slough National Estuarine Research Reserve
50-74%
25-49%
1-24%
>75%
Small isolated patches
Percent Cover of Z. japonica in
Bandon Marsh National Wildlife Refuge, 2005
Developing technologies
Aerial photographic surveys using
•true color (TC) film
•false-color near-infrared (color infrared, CIR) film