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Mudflat

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General sketch-map of a tidal plain, showing the typical tripartition in supratidal, intertidal and subtidal zones. The most apparent character of the area is the development of tidal channels, affecting mainly the intertidal zone. In this case, the tidal flat is protected seaward by a beach barrier, but in many cases (low-energy waves and longshore currents) the tidal flats may directly pass into a shallow marine environment.

Mudflats or mud flats, also known as tidal flats, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A recent global analysis suggested they are as extensive globally as mangroves. [1] They are found in sheltered areas such as bays, bayous, lagoons, and estuaries; they are also seen in freshwater lakes and salty lakes (or inland seas) alike, wherein many rivers and creeks end.[2] Mudflats may be viewed geologically as exposed layers of bay mud, resulting from deposition of estuarine silts, clays and aquatic animal detritus. Most of the sediment within a mudflat is within the intertidal zone, and thus the flat is submerged and exposed approximately twice daily.

In the past tidal flats were considered unhealthy, economically unimportant areas and were often dredged and developed into agricultural land.[3] Several especially shallow mudflat areas, such as the Wadden Sea, are now popular among those practising the sport of mudflat hiking.

On the Baltic Sea coast of Germany in places, mudflats are exposed not by tidal action, but by wind-action driving water away from the shallows into the sea. These wind-affected mudflats are called windwatts in German.

Ecology

Mudflats near Oban on Stewart Island, New Zealand

Tidal flats, along with intertidal salt marshes and mangrove forests, are important ecosystems.[4] They usually support a large population of wildlife, and are a key habitat that allows tens of millions of migratory shorebirds to migrate from breeding sites in the northern hemisphere to non-breeding areas in the southern hemisphere. They are often of vital importance to migratory birds, as well as certain species of crabs,[5] mollusks and fish.[6] In the United Kingdom mudflats have been classified as a Biodiversity Action Plan priority habitat.

The maintenance of mudflats is important in preventing coastal erosion. However, mudflats worldwide are under threat from predicted sea level rises, land claims for development, dredging due to shipping purposes, and chemical pollution.[1] In some parts of the world, such as East and South-East Asia, mudflats have been reclaimed for aquaculture, agriculture, and industrial development. For example, around the Yellow Sea region of East Asia, more than 65% of mudflats present in the early 1950s had been destroyed by the late 2000s.[7][8] It is estimated that up to 16% of the world tidal flats have disappeared since the mid-1980s. [1]

Mudflat sediment deposits are focused into the intertidal zone which is composed of a barren zone and marshes. Within these areas are various ratios of sand and mud that make up the sedimentary layers.[9] The associated growth of coastal sediment deposits can be attributed to rates of subsidence along with rates of deposition (example: silt transported via river) and changes in sea level.[9]

Barren zones extend from the lowest portion of the intertidal zone to the marsh areas. Beginning in close proximity to the tidal bars, sand dominated layers are prominent and become increasingly muddy throughout the tidal channels. Common bedding types include laminated sand, ripple bedding, and bay mud. Bioturbation also has a strong presence in barren zones.

Marshes contain an abundance of herbaceous plants while the sediment layers consist of thin sand and mud layers. Mudcracks are a common as well as wavy bedding planes.[9] Marshes are also the origins of coal/peat layers because of the abundant decaying plant life.[9]

Salt pans can be distinguished in that they contain thinly laminated layers of clayey silt. The main source of the silt comes from rivers. Dried up mud along with wind erosion forms silt dunes. When flooding, rain or tides come in, the dried sediment is then re-distributed.[9]

Mudflats in Brewster, Massachusetts, United States, extending hundreds of yards offshore at the low tide. The line of wrack and seashells in the foreground indicates the high-water mark.
Gulls feeding on mudflats in Skagit Bay, Washington.

Selected example areas

See also

References

  1. ^ a b c Murray, N.J.; Phinn, S.R.; DeWitt, M.; Ferrari, R.; Johnston, R.; Lyons, M.B.; Clinton, N.; Thau, D.; Fuller, R.A. (2019), "The global distribution and trajectory of tidal flats", Nature, 565 (7738): 222–225, Bibcode:2019Natur.565..222M, doi:10.1038/s41586-018-0805-8, PMID 30568300/
  2. ^ Swamps and marshes (with thick and deep mud beneath surfaces in hot season) are either freshwater, salty, or brackish.
  3. ^ Dredging Indian River Lagoon Wetlands 1920 - 1950s
  4. ^ Tidal flat habitats
  5. ^ Triño, A. T., & Rodriguez, E. M. (2000). Mud crab (Scylla serrata) culture in tidal flats with existing mangroves. In J. H. Primavera, M. T. Castaños, & M. B. Surtida (Eds.), Mangrove-Friendly Aquaculture: Proceedings of the Workshop on Mangrove-Friendly Aquaculture organized by the SEAFDEC Aquaculture Department, January 11-15, 1999, Iloilo City, Philippines (pp. 171–176). Aquaculture Department, Southeast Asian Fisheries Development Center. https://repository.seafdec.org.ph/handle/10862/454
  6. ^ Manko - Tidal Flat, Mangrove Forest
  7. ^ MacKinnon, J.; Verkuil, Y.I.; Murray, N.J. (2012), IUCN situation analysis on East and Southeast Asian intertidal habitats, with particular reference to the Yellow Sea (including the Bohai Sea), Occasional Paper of the IUCN Species Survival Commission No. 47, Gland, Switzerland and Cambridge, UK: IUCN, p. 70, ISBN 9782831712550
  8. ^ Murray, N.J.; Clemens, R.S.; Phinn, S.R.; Possingham, H.P.; Fuller, R.A. (2014), "Tracking the rapid loss of tidal wetlands in the Yellow Sea" (PDF), Frontiers in Ecology and the Environment, 12 (5): 267–272, doi:10.1890/130260/
  9. ^ a b c d e Reineck, H.E, and I.B Singh, Depositional Sedimentary Environments, 2nd Ed. New York: Springer-Verlag Berlin Heidelberg, 1980, pp. 418-428
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