estuarine

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Aquatic ecology..
FISH 102

• Courage is what it takes to stand up and speak
  but courage is also what it takes to sit down and
  listen. 

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• DO YOU KNOW
• Estuary??

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let us watch a video that will impart knowledge
to you regarding Estuary..
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ESTUARY

• partly enclosed coastal body of water w/ 1 or
  more rivers or streams flowing into it, and with
  a free connection to the open sea.
• affected by tidal action.
• transition zone or ecotone between fresh water
  and marine habitats.
• belongs to class of fluctuating water level
  ecosystem
• maybe define as a wide mouth of a river or arm
  of the sea where tides ebb and flow as they meet
  the river current.

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ESTUARY
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ESTUARY
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ESTUARY
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ESTUARY
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ESTUARY
ST.LUCIA ESTUARY
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Estuaries can be classified according to
salinity as

• Oligohaline - Low salinity brackish (0.5-5 ppt).
• Mesohaline - Moderately brackish water with a
  salinity range of 5-18 ppt.
• Polyhaline - Highly brackish water with a
  salinity of range 18-30 ppt.

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3 GIVEN CLASSIFICATIONS OF ESTUARIES ARE GIVEN AS

• Geomorphology
• Water circulation stratification
• System Energetics

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ESTUARY
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SAN FRANCISCO BAY AREA
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Classification under Water Circulation
Stratification
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• Estuarine water circulation is controlled by the
  inflow of rivers, the tides, rainfall and evaporat
  ion, the wind, and other oceanic events such as
  an upwelling, an eddy, and storms. Water
  circulation patterns are influenced by vertical
  mixing and stratification, and can affect
  residence time and exposure time.
• Highly Stratified or Salt Wedge Estuary
• Partially Mixed or Moderately Stratified Estuary
• Completely Mixed or Vertically Homogenous Estuary

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?Classification under System Energetics

• Physically stressed systems of wide latitudinal
  range
• Natural arctic systems with ice stress
• Natural temperate coastal ecosystems with
  seasonal programming
• Natural tropical coastal ecosystems of high
  diversity
• Emerging new systems associated with man

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FLORA and FAUNA

• Mixture of endemic species(restricted to
  estuaries only) and those w/c come from the sea.
• Sea trout, Menhaden, Oyster, crabs, spawn,
  Salmon, eel, meroplankton, haloplankton, mugils

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