Sea grass

group of plants, with the same habit

Sea grasses are flowering plants which live in the sea. They come from one of four plant families in the order Alismatales. They are monocotyledons which grow in marine, fully saline environments.

A sea grass bed in Florida Bay
Young mangroves and carbonate mud in the internal part of the lagoon – Florida Bay
Diagram of plant evolution from the Precambrian to the sea grasses.

Sea grass (seagrass) is a key part of continental shelf ecosystems where phytoplankton produce carbonate sediment. This kind of ecosystem occurs in subtropical places like Florida Bay, and around Bermuda. Sea grass beds often contain many species from various phyla. Apparently, seagrass herbivory is a highly important link in the food chain. Many species feed on sea grasses, such as green turtles, dugongs, manatees, fish, geese, swans, sea urchins and crabs.

The surface of the seagrass is the place where Melobesia, a small alga, makes chalk as a by-product of its metabolism. That is not the only chalk-producing organism in the seagrass beds.[1]

Largest plantEdit

A huge bed of seagrass has been found off the coast of Western Australia.

Researchers collected shoots from the bay and looked at 18,000 genetic markers. It is all from the same plant, and covers about 77 square miles (200 square kilometres).[2]

BibliographyEdit

  • Green E.P. & Short F.T. (eds) 2003. World atlas of seagrasses. University of California Press, Berkeley, CA. ISBN 0-520-24047-2
  • Hemminga M.A. & Duarte C. 2000. Seagrass ecology. Cambridge University Press, Cambridge. ISBN 9780521052498
  • Hogarth, Peter 2007. The biology of mangroves and seagrasses Oxford University Press. ISBN 9780198568711
  • Larkum A.W.D; Orth R.J & Duarte C.M. (eds) 2006. Seagrasses: biology, ecology and conservation Springer. ISBN 1-4020-2942-X

ReferencesEdit

  1. Westbroek, Peter 1991. Life as a geological force, p158–165. W.W. Norton, New York. ISBN 0-393-30817-0
  2. Tiffanie Turnbull BBC News Sydney. World's biggest plant discovered off Australian coast. [1]