LIM-13-7a-Ek Sg & Danau.ppt

8/10/2019 LIM-13-7a-Ek Sg & Danau.ppt

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Freshwater L i fe Zones

Salt concentration of less than 1%

Standing bodies (lakes, ponds, inlandwetlands)

Flowing bodies (streams and rivers)


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Rain and snow

Water

Sediment

LakeGlacier

RapidsWaterfall

Tributary Flood plain

Oxbow lake

Salt marsh

Delta

Ocean

DepositedsedimentSource Zone

Transition Zone

Floodplain Zone

Major

Character ist ics o f Freshwater

Streams and Rivers


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Water f low s downh i ll

Surface water

Runoff

Watershed

Drainage basin

River basin


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Types of organisms

Phytoplankton cyanobacteria and algae

Zooplankton primary and secondary consumers

Nekton Swimming consumers (fish, turtles, and whales)

Benthos bottom dwellers

Barnacles and oysters Worms Lobsters and crabs

Decomposers bacteria


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Food

Drinking water

Irrigation water

Hydroelectricity

Transportation

corridors

Recreation

Employment

Climate moderation

Nutrient cycling

Waste treatment

Flood control

Groundwater

recharge

Habitats for many

species

Genetic resources

and biodiversity

Scientific

information

Economic

Services

Freshwater Systems

Ecological

Services

Natural Capital


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Factors Limiting Life in AquaticLife Zones

1) Temperature2) Access to sunlight

Euphotic zone3) Dissolved oxygen

5 ppm

4) Available nutrients Shallow water upwelling


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L i fe Zones Found in Freshwater

Littoral zoneconsists of shallow waternear the shore to the depth at whichrooted plants quite growing.

Limnetic zone

the open sunlite watersurface away from the shore. The mainphotosynthetic body of the lake.

Profundal zone

deep, open water, toodark for photosynthesis.

Benthic zoneat the bottom of the lake.

Cool temperatures and low oxygen levels.


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Sunlight

Painted

turtleGreen

frog

Pond

snail

Blue-winged

teal

Muskrat

Plankton

Northern

pike

BloodwormsYellow

perch

Diving

beetle

Littoral zone

Limnetic zone

Profundal zone

Benthic zone


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Seasonal Changes in Lakes

Epilimnion

Thermocline

Hypolimnion

Fall overturn

Spring

overturn Fig . 7-22 p. 159


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Effec ts o f Plan t Nutr ien ts on

Lakes:

Too Much of a Good Thing

Cultural eutroph icat ion:

Human inputs of nutrients from the

atmosphere and urban and agricultural areas

can accelerate the eutrophication process.


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LIM-13-7a-Ek Sg & Danau.ppt

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