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1A2_2013 Group 6 - Freshwater Lake

Page history last edited by Mr Tan Zhi Yao 8 years ago



Names/Roles :

  • Raudhah      (Leader)
  • Sorfina      (Wiki Writer)
  • Arafah      (Researcher)
  • Atthirah     (Researcher)
  • Ilyanah      (Researcher) 

.Freshwater biomes consist of streams and rivers, wetlands, ponds and lakes, and the plants and animals that live within them. Freshwater biomes exist worldwide, and they are different in every country.



  • Location of the ecosystem - They are usually found in low lying areas and are fed from streams, rivers and runoff from the surrounding area.
  • Description of ecosystem - Freshwater lakes are bodies of still, unsalted water surrounded by land. Freshwater lakes provide a unique habitat for micro-organisms because they differ from other aquatic habitats such as oceans and moving water. These micro-organisms help to remove inorganic compounds, mineralize nitrogen, and decompose organic matter, as well as other important processes.
  •  Biodiversity of ecosystem (richness of life in ecosystem) -  Freshwater biodiversityconstitute a valuable natural resource, in economic, cultural, aesthetic, scientific and educational terms. Theirconservation and management are critical to the interests of all humans, nations and governments.



Physical Factors

Search the Internet for information on the following physical factors in the allocated ecosystem.

  • Light (availability of sunlight in the ecosystem) - It's used in photosynthesis along with CO2 (carbondioxide) to make oxygen and sugars.
  • Temperature (temperature of the ecosystem) - The average temperature in summer, winter & spring is 4-22°C, 4-22°C, 4°C respectively.
  • Water (water quality in the ecosystem) - It is drinkable.


  • Air (quality of air in the ecosystem) - Air is not polluted.



Classification of Living Organisms

Classify at least eight of the living organisms found in the allocated ecosystem into the categories below:

  1. Producers - Plants and Algae. 


- It can usually be found on Humid soil, rocks and tree barks. Algae have two colours, which is Brown and Green.

  1. Primary Consumers - Zooplankton.


- They are usually found under the Oceans and Fresh Water. 

  1. Secondary Consumers - Planktivorous Fish.


- Planktivorous is found where there is a huge amount of Zooplankton .  

  1. Tertiary Consumers - Alligators, Turtles, and Large fish.


-Snapping turtles live only in fresh or brackish water. They prefer water with muddy bottoms and lots of vegetation so that they can hide more easily. Snapping turtles spend almost all their time in water, but do go on land to lay their eggs in sandy soil.

  1. Decomposers - Bacteria, Fungi.


-Fungi can be found in rising bread, moldy bread, and old food in the refrigerator, and on forest floors.

For each of the living organism, find a picture and write a short description on the organism. You may wish to include feeding habits, region in the ecosystem where it is normally found etc. 




Food Web 




Interrelationship in Ecosystem

Give at least one example for each of the following relationships in the ecosystem:

  1. Predator-prey relationship - Predators are animals which catch and eat other animals. The animals they eat are their prey.



  1. Parasitism - An organism gains benefits from another organism .


  1. Mutualism - Mutualism is a relationship between two organism and both benefits.




Useful Links

Plagarism is a strongly discouraged.


Include the links of all websites you obtained information from to complete your ecology wiki. 

For example:

Wild World @ nationalgeographic.com ( http://www.nationalgeographic.com/wildworld/terrestrial.html )  


Climate change

Climate change is already beginning to affect plants and animals that live in freshwater lakes and rivers, altering their habitat and bringing life-threatening stress and disease.


-  Effects on reproduction. Earlier snowmelt, rising amounts of precipitation that falls as rain rather than snow, and more severe and frequent flooding (linked to global warming)may affect the reproduction of aquatic species. Some salmon populations have declined, for example, as more intense spring floods have washed away salmon eggs laid in stream beds.


Displacement of cold-water species.  As air temperatures rise, water temperatures do also.  Streams and lakes may become unsuitable for cold-water fish but support species that thrive in warmer waters. Some warm-water species are already moving to waters at higher latitudes and altitudes.


- Dead zones.  In a warming climate, a warmer upper layer in deep lakes slows down air exchange.This, in turn, often creates large "dead zones"—areas depleted of oxygen and unable to support life. Persistent dead zones can produce toxic algal blooms, foul-smelling drinking water, and massive fish kills.





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