Seagrass restoration in Little Lagoon May 2 nd and 3 rd 2009 Bart Christiaen.

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Presentation transcript:

Seagrass restoration in Little Lagoon May 2 nd and 3 rd 2009 Bart Christiaen

What are seagrasses? flowering plants salt water ShoalgrassWidgeongrassTurtlegrass

Why are they important? Food & shelter

Why are they important? sediment stabilization input organic matter sediment chemistry

Problem: worldwide decline seagrass declines reported since 1970 (Short & Echeverria 1996)

Underlying cause...

For example: in Florida Population increase Decrease in seagrass cover

Mechanism Direct effects: prop scarring, construction,...

Mechanism Indirect effects: shading

Shading

What can we do? Government: protection of existing beds regulation of dredging, watershed development,... Citizens: responsible boating

What can we do?

If water quality is sufficient Seagrass restoration

Seagrass restoration in Little Lagoon

Not as simple as it looks Notoriously high failure rate You’ve got to do it right!

Site selection Site selection based on water quality, sediment, exposure to wave energy,... NE corner of Bon Secour Wildlife Refuge, near the Jeff Friend Trail

Method selection & test Best candidate for restoration: shoalgrass

Method selection & test Appropriate method: transplantation % survival shoalgrass plugs weeks % survival

Method selection & test

It works = bigger scale!

But... Seagrass transplantation is a lot of work

We need help When? → 2 nd & 3 rd May of 2009 → in the morning Where? → parking lot of Jeff Friend Trail What? → short demonstration → planting together with students from Dauphin Island Sea Lab → knee deep – waist deep water

We need help If you want to volunteer, please contact Dennis Hatfield Bart Christiaen THANK YOU

If you have any questions Please ask!