Seagrass meadows slow water, trap particles, anchor sediment and create nursery and feeding habitat. Their roots and oxygen-poor soils can store organic carbon for long periods, making loss important far beyond the plants themselves.
Three things to know
- Seagrass is
- A flowering plant
- It evolved from land-plant ancestors and produces flowers, pollen and seeds.
- Carbon store
- Mostly soil
- Buried roots, rhizomes and trapped particles build long-lived stocks.
- Habitat users
- Turtles to sharks
- Meadows feed grazers and shelter juvenile fish and invertebrates.
A submerged grassland
Leaves capture sunlight in shallow water while rhizomes spread through sediment. Unlike seaweeds, seagrasses have roots and internal vascular tissues. They require enough light, so turbidity and algal growth can set their depth limit.
The meadow changes the water around it
Dense blades slow currents and waves, encouraging particles to settle. Roots and rhizomes bind the bottom. This can improve water clarity and reduce erosion, creating feedbacks that help the meadow persist when conditions remain suitable.
Loss can unlock stored carbon
Dredging, poor water quality, heat stress, propeller scars and disease can fragment beds. When soils erode or become oxygenated, stored organic matter may decompose more quickly. Protection therefore preserves habitat and avoids some emissions; it is not a substitute for reducing fossil-fuel carbon.
What people usually ask
Is seagrass the same as seaweed?
No. Seagrasses are true flowering plants; seaweeds are algae.
Do seagrasses grow in the deep sea?
No. They need sunlight and are mostly restricted to shallow coastal waters.
Here’s where the answer came from
Open the original government science or research-institution source behind this page.