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Are you ready for the map quiz?

Are you ready for the map quiz?. Galveston Bay is an Estuary. Freshwater inflows from rivers and bayous meet saltwater from the Gulf of Mexico Fresh + Salt = Brackish water. Galveston – we’re #3!.

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Are you ready for the map quiz?

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  1. Are you ready for the map quiz?

  2. Galveston Bay is an Estuary • Freshwater inflows from rivers and bayous meet saltwater from the Gulf of Mexico • Fresh + Salt = Brackish water

  3. Galveston – we’re #3!

  4. Today: What factors affect life in the Bay? Why are certain organisms found in certain places, but not others?

  5. When you see the pattern, suggest another idea • List 2: • Brown shrimp • Oysters • Chord grass • Dolphin • Blue crab • Red drum • List 1: • Dissolved Oxygen • Tides • Wind speed and direction • Salinity • Water depth

  6. Salinity is a critical abiotic factor • Freshwater inflows from rivers and bayous meet saltwater from the Gulf of Mexico • Fresh + Salt = Brackish water

  7. Add to your map! • Trinity River – 54% inflow • San Jacinto River – 28% inflow • Add these numbers to your map! • On your map, add shading: more bluenear mouth of rivers and bayous, • More yellow at mouth of Bay

  8. Tides affect the Bay too! • Tides are caused by the moon. • Two high tides and two low tides each day. • Tides are most dramatic closer to the ocean. • On your map, mark a point where there would be most dramatic tides (TIDES!!!) and least dramatic tides (tides) and (no tides)

  9. New page interactive notebook • Title: Abiotic Factors in an Estuary • Date: check the board!

  10. Copy this on the right side: • Important abiotic factors in Galveston Bay • Dissolved Oxygen • Tides • Wind speed and direction • Salinity • Water depth • Nitrates/Phosphates • pH

  11. Where would you expect to find these? Add them to your map! • Juvenile blue crab - 0.0 - 0.5 ppt salt • Oysters - 0.5 - 15.0 ppt salt • Lady fish- 25.0 ppt salt • Nurse shark – 35 ppt salt • Ocean 35 ppt

  12. Range of Tolerance

  13. *Range of Tolerance • All organisms have a limit for each abiotic factors in their habitat. There is an upper and lower limit for how much they can tolerate.

  14. What about those freshwater inflows? • Blue water = salty • Colorless = fresh • What happens when they mix?

  15. *Salt water is more dense than fresh water! Fresh water comes in and is on top near river mouths.

  16. What factors affect salinity? • Human caused • Natural

  17. So how do oceans become salty anyway? • Salts occur naturally in soil on the land. • Rainwater picks up salts in runoff. • Rivers bring salts to the ocean. • Evaporation in the ocean removes water, leaving salt behind. • Over millions of years, oceans become salty.

  18. Check for understanding! • 1. Which is more dense – salt water or fresh water? • 2. What river contributes the greatest amount of fresh water in Galveston Bay? • 3. Why couldn’t a juvenile crab live at the mouth of Galveston Bay? • 4. List three abiotic factors that affect organisms in an estuary. • 5. Why is the ocean salty?

  19. New Page: • Title: Barrier Islands • Date: check the board!

  20. Barrier Island

  21. Barrier Island

  22. Barrier Island

  23. Build it! • One white board • One marker • One playdough

  24. Interactive notebook: • Draw what you built. • Include: • Ocean • Bay • Beach • Dune • Swale • Prairie • Wetland • Fresh water • Salt water • Brackish water

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