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Lota A. Lleve

Jonna Marie P. Marquez-I

Juval Niel A. Morden

Michaela Rosabelle D. MasangkayJulita T. Hermoso

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LAKES A body of relatively still fresh or salt water

of considerable size, localized in a basin,

which is surrounded by land.

Generally found in mountainous areas, rift

zones and areas with ongoing glaciations.

Also found in endorheic basins or along the

courses of mature rivers.

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CASPIAN

SEA

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NON-LIVING COMPONENTS Non-living components in lakes consists of:

*Water

*Dirt*Rocks and Stones

*Remains of Plants and Animals

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HYDROLOGIC CYCLE

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PHYSICAL CHARACTERISTICS

STRATIFICATION - formationof layers

As summer progresses, mostlakes form three layersnamely :

EPILIMNION(upper layer)- characterized by

warmer(less dense) water.

METALIMNION orTHERMOCLINE

- is a narrow band- colderthan the upper and warmerthan the lower water.

HYPOLIMNION(bottom layer)- has much colder water

among the three

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WHAT HAPPENS.. . .• During SUMMER, the water in lakes in climate tend

to stratify or form layers.

•

During WINTER, many lakes are stratified becauseice covers the lake surface.

• During SPRING, ice melts, the surface waters warm;

sink; and mix with the deeper water.

• During the FALL TURNOVER, surface waters cool

until they are as dense as the bottom and wind

action mixes the lake.

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CHEMICAL CHARACTERISTICSNutrients

• Phosphorus

- controls the extent of algae growth, if morephosphorus is added in a lake, more algae will

grow.

Nitrogen

- second to phosphorus as an importantnutrient for plant and algae growth.

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UNIQUE CHARACTERISTICS Lakes are not subjected to tides.

Lakes are characterized by still waters,

unlike seas, oceans and rivers which arecharacterized by moving waters.

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FOOD CHAIN

Phytoplankton(predominantlyalgae)

- primary producers in theaquatic environment

- requires sunlight, water, andnutrients for photosynthesis

Zooplankton(shrimp-like

Daphnia and Bosmina)- considered herbivorous because

they consume plants

Planktivores(fish such asminnows, small sunfish and

gizzard shad)- organisms that eat Zooplankton

Piscivores(fish-eating fish,

such as bass, pike, and walleye)

- at the top of the aquatic food

chain

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FOOD WEB

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SOURCES: http://en.wikipedia.org/wiki/Lake 

http://en.wikipedia.org/wiki/Caspian_Sea 

http://www.ecy.wa.gov/programs/wq/plants/lakes/characteristics.html 

http://www.iwr.msu.edu/edmodule/water/c

ycle.htm 

http://www.google.com.ph/imgres?q=food+web+in+lakes&hl