Are you ready for the map quiz?

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Are you ready for the map quiz?
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Galveston Bay is an Estuary

• Freshwater inflows from rivers and bayous meet
  saltwater from the Gulf of Mexico
• Fresh Salt Brackish water

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Galveston were 3!
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Today What factors affect life in the Bay? Why
are certain organisms found in certain places,
but not others?
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When you see the pattern, suggest another idea

• List 1
• Dissolved Oxygen
• Tides
• Wind speed and direction
• Salinity
• Water depth

• List 2
• Brown shrimp
• Oysters
• Chord grass
• Dolphin
• Blue crab
• Red drum

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Salinity is a critical abiotic factor

• Freshwater inflows from rivers and bayous meet
  saltwater from the Gulf of Mexico
• Fresh Salt Brackish water

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Add to your map!

• On your map, add shading more blue near mouth
  of rivers and bayous,
• More yellow at mouth of Bay

• Trinity River 54 inflow
• San Jacinto River 28 inflow
• Add these numbers to your map!

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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)

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New page interactive notebook

• Title Abiotic Factors in an Estuary
• Date check the board!

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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

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• 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

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Range of Tolerance

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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.

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What about those freshwater inflows?

• Blue water salty
• Colorless fresh
• What happens when they mix?

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Salt water is more dense than fresh water!
Fresh water comes in and is on top near river
mouths.
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What factors affect salinity?

• Natural

• Human caused

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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.

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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 couldnt 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?

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New Page

• Title Barrier Islands
• Date check the board!

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Barrier Island
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Barrier Island
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Barrier Island
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Build it!

• One white board
• One marker
• One playdough

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(No Transcript)
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Interactive notebook

• Draw what you built.
• Include
• Ocean
• Bay
• Beach
• Dune
• Swale
• Prairie
• Wetland

• Fresh water
• Salt water
• Brackish water