LENTIC

STANDING BODY OF FRESH WATER

• Examples include:
• Lake
• Pond
• Inlet wetlands

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• Oxygen poor at deeper levels
• Become shallower over time from Sediment
• Gradually turns into marsh or swamp
• Temperatures vary at different depths

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• Many lakes and ponds were formed during ice age
• Glaciers cut through the land

HABITAT ZONES

• Littoral- shallow vegetation near shore
• Limnetic- top layer of water. Photosynthesis occurs here
• Profundal- deep bottom water area. No light penetration
• Benthic- bottom surface of lake. Only nutrients is dead matter from above

OLIGOTEOPHIC

• Low levels of nutrients and priductivity

MESOTROPHIC

• Moderate nutrients

EUTROPHIC

• High levels of nutrients
• High priductivity

HYPEREUTROPHIC

• Excess nutrients

STRATIFICATION

• Lakes become layered in summer
• Epilimnion- warmest zone
• Metailmnion-middle, temp declines and changes often
• Hypolimnion- bottom layer, deep & cold

"TURNS"

• Lake turn over in the summer
• Surface layer becomes colder and denser
• It sinks to bottom.
• Self explanitory, really.

AGING NOT GRACEFULLY

• Lentic systems go through succession
• Basically, they slowly fill with sediment
• Thus becoming maeshes, swamps, or bogs