LAKES AND PONDS ECOSYSTEM
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LAKES AND PONDS ECOSYSTEM. Ponds and Lakes. Range in size from just a few square meters to thousands of square kilometers. Ponds may be seasonal, lasting just a couple of months (such as sessile pools). Lakes may exist for hundreds of years or more. Ponds and Lakes.

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LAKES AND PONDS ECOSYSTEM

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Lakes and ponds ecosystem

LAKES AND PONDS ECOSYSTEM


Lakes and ponds ecosystem

Ponds and Lakes

  • Range in size from just a few square meters to thousands of square kilometers.

  • Ponds may be seasonal, lasting just a couple of months (such as sessile pools).

  • Lakes may exist for hundreds of years or more.


Lakes and ponds ecosystem

Ponds and Lakes

  • May have limited species diversity

    • they are often isolated from one another and from other water sources like rivers and oceans.

  • Most ponds and lakes have outlet streams and both are generally temporary features on the landscape


Lakes and ponds ecosystem

Formation of Lakes and Ponds:

  • Some of the oldest lakes and ponds (more than three hundred thousand years old) were formed by tectonic activity related to movement of Earth's crust.

  • EXAMPLE: Lake Baikal in Siberia formed from the movement of tectonic plates and is the largest freshwater lake by volume in the world.


Lakes and ponds ecosystem

Formation of Lakes and Ponds:

  • Lakes and ponds are formed through a variety of events, including glacial, tectonic, and volcanic activity.

  • Most lakes and ponds form as a result of glacial processes.

    • As a glacier retreats, it may leave behind an uneven surface containing hollows that fill with water.


Lakes and ponds ecosystem

Formation of Lakes and Ponds:

  • Volcanic activity can also lead to lake and pond formation.

  • EXAMPLE: the collapse of a volcanic cone of Mount Mazama in Oregon led to the formation of Crater Lake, the seventh deepest lake in the world.


Lakes and ponds ecosystem

Lake Baikal

Crater Lake , Oregon


Lakes and ponds ecosystem

Ponds and Lakes

  • Temperature varies seasonally.

  • During summer the temp. is from 4°C near the bottom to 22°C at the top.

  • During winter the temp. is from 4° C while the top is 0° C (ice).

  • during the spring and fall seasons is a mixing of the top and bottom layers resulting in a uniform water temperature of around 4° C.


Lakes and ponds ecosystem

Ponds and Lakes

  • divided into four different “zones” determined by depth and distance from the shoreline

    • littoral zone

    • limnetic zone

    • profundal zone

    • Photic zone

    • Benthic zone


Lakes and ponds ecosystem

Littoral

Zone

Limnetic

Zone

Photic Zone

Profundal (aphotic) zone

Benthic Zone


Lakes and ponds ecosystem

Littoral Zone

  • warmest since it is shallow and can absorb more of the Sun’s heat

  • sustains a fairly diverse community

    • several species of algae (like diatoms)

    • rooted and floating aquatic plants

    • grazing snails

    • Clams

    • Insects

    • Crustaceans

    • Fishes

    • amphibians


Lakes and ponds ecosystem

Littoral Zone

  • the egg and larvae stages of some insects are found in this zone

  • vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks


Lakes and ponds ecosystem

Limnetic Zone

  • near-surface open water surrounded by the littoral zone

  • well-lighted (like the littoral zone) and is dominated by plankton, both phytoplankton and zooplankton

  • plankton are small organisms that play a crucial role in the food chain – most life would not be possible without them

  • variety of freshwater fish also occupy this zone


Lakes and ponds ecosystem

Profundal Zone

  • much colder and denser

  • little light penetrates all the way through the limnetic zone into the profundal zone

  • Plankton have short life spans—when they die, they fall into the deep-water part of the lake/pond

  • Animals found are decomposers


Lakes and ponds ecosystem

Photic zone

  • Primary production in the photic zone is influenced by three major factors

    • Nutrients

    • Light- For photosynthesis

    • Grazing pressure-the rate at which the plants are eaten by herbivores. 


Lakes and ponds ecosystem

Photic zone

  • Nutrients, especially phosphate and nitrate, are often scarce in the photic zone because they are used up quickly by plants during photosynthesis.

  • External inputs of nutrients are received through:

  • Rainfall

  • Riverflow

  • Weathering of rocks and soil 

  • Human activities- sewage dumping.


Lakes and ponds ecosystem

Benthic Zone

The area of the bottom. 

Many groups and varieties of animals live here, a few are worms, crustaceans, and protozoa.  

The life in this zone is mostly made up of bottom dwellers which get most of their food from dead and decaying organisms.  

most of the organisms in the benthic zone are scavengers because they depend on dead flesh as their main food source.


Lakes and ponds ecosystem

LAKES ECOSYSTEM


Lakes and ponds ecosystem

Clasification of Lake

  • Oligotrophic lakes- deep, nutrient-poor lakes in which the phytoplankton is not very productive.

    • The water is usually clear

  • Eutrophic lakes-shallow, nutrient-rich lakes with very productive phytoplankton.

    • The waters are usually murky due to large phytoplankton populations

    • the large amounts of matter being decomposed may result in oxygen depletion.


Lakes and ponds ecosystem

Lakes Ecosystem

A lake is bigger than a pond, and is too deep to support rooted plants except near the shore. Some lakes are big enough for waves to be produced.

Lakes may exist for hundreds of years or more.

Lakes are often classified as oligotrophic or eutrophic, depending on the amount of organic matter produced.


Lakes and ponds ecosystem

Oligotrophic lake

Eutrophic Lake


Lakes and ponds ecosystem

Examples of lakes

Taal volcano lake

Mitchigan lake

Silver lake

Lake lamonia

Grasmere lake


Lakes and ponds ecosystem

Layers of lake separated by density gradient.


Lakes and ponds ecosystem

1. Epilimnion

 the top-most layer in a thermally stratified lake.

It is warmer and typically has a higher pH and dissolved oxygen concentration than the hypolimnion.

It typically mixed as a result of surface wind-mixing.

Free to exchange dissolved gases (ie O2 and CO2) with the atmosphere.

It contains the most phytoplankton.


Lakes and ponds ecosystem

2. Thermocline

(sometimes metalimnion) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake, or air, such as an atmosphere).

Temperature changes more rapidly with depth than it does in the layers above or below.

Thermoclines may be a semi-permanent feature of the body of water in which they occur, or they may form temporarily in response to phenomena such as the radiative heating/cooling of surface water during the day/night.

Factors that affect the depth and thickness of a thermocline include seasonal weather variations, latitude, and local environmental conditions, such as tides and currents.


Lakes and ponds ecosystem

3. Hypolimnion

The hypolimnion is the dense, bottom layer of water in a thermally-stratified lake. It is the layer that lies below the thermocline.

Typically the hypolimnion is the coldest layer of a lake in summer, and the warmest layer during winter. Being at depth, it is isolated from surface wind-mixing during summer, and usually receives insufficient irradiance (light) for photosynthesis to occur.

In deep, temperate lakes, the bottom-most waters of the hypolimnion are typically close to 4°C throughout the year. The hypolimnion may be much warmer in lakes at warmer latitudes.


Lakes and ponds ecosystem

BLUE LAKE


Lakes and ponds ecosystem

Mono Lake

Dal Lake

Okanagan Lake

Lake Titicaca


Lakes and ponds ecosystem

Lac Pavin in France is a meromictic crater lake


Lakes and ponds ecosystem

Lake Hoare


Lakes and ponds ecosystem

Freshwater: biological communities of lakes


Lakes and ponds ecosystem

PONDS ECOSYSTEM


Lakes and ponds ecosystem

Ponds Ecosystem

A pond is a small, shallow body of fresh, standing water in which relatively calmwater and extensive plant growth.

The amount of dissolved oxygen may vary greatly during a day. In really cold places, the entire pond can freeze solid.

Water temperature is fairly even from top to bottom and changes with air temperature.


Lakes and ponds ecosystem

Types of ponds

Cypress Ponds

Bog Ponds

Meadow-Stream Ponds

Mountain Ponds

Farm Ponds


Lakes and ponds ecosystem

1. Cypress Ponds

Commonly found in the central or lower Mississippi Basin

Waters are described as being brownish in color

Many dry out during parts of the year.

Willows, bay trees mixed with cypress trees, grow along the shore and are often found out in the waters.


Lakes and ponds ecosystem

Cypress Pond on the Conecuh River near River Falls, Alabama


Lakes and ponds ecosystem

2. Bog Ponds

Bog Ponds are often found in the moist temperature regions of North America.

Water is highly acidic and often muddy.

Alders and cedar trees dominate

Floating-leaf plants usually cover the surface.


Lakes and ponds ecosystem

3. Meadow-Stream Ponds

Where streams widen and the speeds of its currents slow down tremendously.

The shallow part of the pond usually has an abundance of pondweeds, cattails, stoneworts and other plants.

Floating leafy plants on the surface of the water, such as lilies and water shields.


Lakes and ponds ecosystem

4. Mountain Ponds

Formed by glaciers

Bottoms range from being rocky, graveled or muddy.

Most of the time Mountain Ponds have ice in them and they usually dry up at some point during the summer.

Sedges grow along its margins. In spite of the pond’s short summer season, a variety of animals and plants live in these icy waters.


Lakes and ponds ecosystem

5. Farm Ponds

Man-made ponds built to help keep the farmlands fertile.

It should also have a spillway to control the water level.

Farm ponds usually become abundant in fish, and are usually good waters for swimming and boating.

They should also fill from seepage, not from another stream which would fill the basin of the pond with silt and eventually kill the pond.


Lakes and ponds ecosystem

Examples of ponds


Lakes and ponds ecosystem

VEGETATION IN LAKES AND PONDS ECOSYSTEM


Lakes and ponds ecosystem

Animals in Lakes and Ponds

Bitterling

Green and Gold

Bell Frog

Bullfrog

Common Carp

Largemouth Bass 

Great Crested Grebe

Great White Pelican

Zambesi Softshell

Platypus

Lake Trout


Lakes and ponds ecosystem

Functions:

  • Lakes and ponds typically contain a diversity of organisms that perform different ecological functions.

  • Lakes and ponds are an important source of fresh water for human consumption

  • Water has a high capacity for heat and earth is mostly covered with water, so the temperature of the atmosphere is kept fairly constant and able to support life.

  • Plankton which account for most of the photosynthesis on Earth found in lakes, ponds and oceans. Without, there might not be enough oxygen to support such a large world population and complex animal life.

  • We fish from the ponds and we often eat the fish we catch. Most of the time our water comes from the lakes and ponds, but purified.


Lakes and ponds ecosystem

Environmental Problems:

  • Freshwater biomes have suffered mainly from pollution.

  • Runoff containing fertilizer and other wastes, and industrial dumpings enter into rivers, ponds, and lakes tend to promote abnormally rapid algae growth- ARTIFICAIL EUTROPHICATION

  • When algae die, dead organic matter ends up in the water. This makes the water unusable, and it kills many of the organisms living in the habitat.


Lakes and ponds ecosystem

Possible Solution:

  • Pond Aeration

  • To restore a pond or lake to a healthy condition, we must restore the natural processes that allow them to assimilate the nutrient load that it receives.

    • Ideally, nutrient inputs should be reduced or eliminated wherever possible. Only use phosphorus-free fertilizers on lawns.

  • Preventing nutrients from flowing down storm sewers is a good way to prevent pollution. 


Lakes and ponds ecosystem

THE END……


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