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Zostera marina is a flowering vascular plant species as one of many kinds of seagrass, with this species known primarily by the English name of eelgrass with seawrack much less used, and refers to the plant after breaking loose from the submerged wetland soil, and drifting free with ocean current and waves to a coast seashore.
Since the late 19th century, over 20% of the global seagrass area has been lost, with seagrass bed loss occurring at a rate of 1.5% each year. [117] Of the 72 global seagrass species, approximately one quarter (15 species) could be considered at a Threatened or Near Threatened status on the IUCN’s Red List of Threatened Species. [ 118 ]
This seagrass is sensitive to light deprivation and a lowering of salinity in its environment. In a major flooding event in Queensland, half the seagrasses were lost in a shallow study area in Moreton Bay, the Syringodium isoetifolium disappearing almost completely while Zostera muelleri and other seagrass species survived, relatively unaffected. [4]
The current documented seagrass area is 177,000 km 2 (68,000 sq mi), but is thought to underestimate the total area since many areas with large seagrass meadows have not been thoroughly documented. [11] Most common estimates are 300,000 to 600,000 km 2, with up to 4,320,000 km 2 suitable seagrass habitat worldwide. [24]
Enhalus acoroides massive rhizomes (1.5 cm in diameter) help it stay anchored in soft mud substrates, withstanding wave action and tidal currents. it has long strap like leaves (30–150 cm) which make up a significant volume of total plant biomass of shallow water seagrass beds, because of the large structure of the leaves and where they are in the water column, they provide greater surfaces ...
Thalassia testudinum is a perennial grass growing from a long, jointed rhizome.The rhizome is buried in the substrate 5 to 10 cm (2 to 4 in) deep, exceptionally down to 25 centimetres (9.8 in).