Estuary Notes

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Estuary Notes

  1. 1. Chapter 12 Estuaries Where Rivers meet the Sea
  2. 2.
  3. 3. Estuaries <ul><li>Semi-enclosed areas where fresh water and seawater meet and mix. </li></ul><ul><li>Interaction of land and sea! </li></ul><ul><li>Some of the most productive environments on earth! </li></ul><ul><li>Most affected by humans! </li></ul><ul><ul><li>Harbors </li></ul></ul><ul><ul><li>Cities </li></ul></ul>
  4. 4. Value of Estuaries <ul><li>Protected fertile habitat – Home for many! </li></ul><ul><li>Vital breeding and feeding grounds </li></ul><ul><li>Cities built near estuaries because of great fishing. (shrimp and crab) </li></ul>
  5. 5. Cape Hatteras Estuary In N. Carolina
  6. 6. Milford Sound in New Zealand is a fjord – a finger-like inlet surrounded by sheer walls with a shallow entrance and deep basin resulting in stagnant, oxygen-depleted deep water.
  7. 7. 4 Types of Estuaries <ul><li>Drowned River Valleys or Coastal Plain </li></ul><ul><ul><li>Sea invaded lowlands </li></ul></ul><ul><ul><li>Most common </li></ul></ul><ul><ul><li>Chesapeake Bay </li></ul></ul><ul><li>Bar-built </li></ul><ul><ul><li>Sand builds up to form sand bars and barriers </li></ul></ul><ul><ul><li>Along Texas coast of Gulf of Mexico </li></ul></ul>
  8. 8. 4 Types of Estuaries <ul><li>Tectonic </li></ul><ul><ul><li>Land sinks or earth moves </li></ul></ul><ul><li>Fjords – Glacier Carved </li></ul><ul><ul><li>Retreating glaciers cut deep valleys that are partially submerged </li></ul></ul><ul><ul><li>Common near Alaska </li></ul></ul>
  9. 9. an IDEAL ESTUARY Isohaline are the same salt content water. How many are there?
  10. 10. High Tide Low Tide The Salt wedge moves in and out with the tide
  11. 11. Physical Characteristics of Estuaries <ul><li>Salinity in a salt wedge </li></ul><ul><li>Substrate </li></ul><ul><ul><li>Rivers carry nutrients into estuary by size and weight. Which travels farther? </li></ul></ul><ul><ul><li>Mud = silt and clay high in nutrients </li></ul></ul><ul><ul><li>Anoxic = low oxygen in mud b/c bacteria respiration. </li></ul></ul><ul><ul><li>Anaerobic bacteria thrive in mud. Why? </li></ul></ul>
  12. 12. Physical Characteristics of Estuaries <ul><li>Water temp varies. Why? When? So? </li></ul><ul><li>Exposed organisms during low tides. </li></ul><ul><ul><li>Sun, Drying out, Predation </li></ul></ul><ul><li>Low water clarity causes what problem? </li></ul>
  13. 13. Types of species living in an idealized estuary in relation to salinity. The width of the bars = relative numbers of species
  14. 14. The body fluids of estuarine animals responds in various ways to the salinity of the water. Osmoregulator = blood salinity stays the same. Osmoconformer=blood salinity will change with the water salinity.
  15. 15.
  16. 16. Look at the shallow roots of this mangrove tree reaching above the mud to get oxygen. Why does mud not have much oxygen in it?
  17. 17. Cordgrass is an important component of salt water marshes
  18. 18. Pickle Weed is a common succulent plant in salt marshes around the world.
  19. 19. The Atlantic menhaden is an important commercial fish spawn offshore and larvae drift with tides into the estuary to grow.
  20. 20. The California horn snail is abundant on mudflats
  21. 21. Mudflat animals in temperate estuaries
  22. 22. Fiddler on the Mud What is this behavior for?
  23. 23.
  24. 24. The daily tides play a crucial role in salt marshes. They help circulate detritus and nutrients and expose mudflat organisms to predation by shorebirds and other animals
  25. 25. A salt marsh near Atlantic Beach, NC. Many of these types of marshes have been filled in and destroyed.
  26. 26. A mudskipper from the mudflats of a mangrove forest in New Guinea. Its eyes can see in air.
  27. 27. An Oyster reef formed by the eastern oyster near Beaufort, NC are exposed at low tide.

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