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Comparative Ecosystem Ecology
Transcript of Comparative Ecosystem Ecology
A watery environment was almost certainly the original source of all life on this planet
Water provides a protective shield around the plants and animals, preventing the drying out of cells, providing buoyancy transporting food to organism and carrying waste products away.
Water covers 71% of the surface of the earth. This fact is combined with the great depth of many oceans (average depth is 3,700m/12,140ft)
Fresh water biomes supply us with our drinking water and water for crop irrigation
Aquatic Ecosystem are better able to support life than the terrestrial ecosystem.
The fresh water and marine biomes are probably the most important of all biomes. Their major natural resource.
Water is the basis of life, it supports life, and countless species live in it for all part of their lives
Water has a high capacity of heat, and because the earth is mostly covered with water, the temperature of the atmosphere is kept fairly constant and able to support life
FACTORS THAT CONTROL THE NATURE OF DIFFERENT AQUATIC ECOSYSTEM
Water has several unusual properties that combine to minimize temperature changes, thus the range of variation is smaller and changes more slowly in water than in air.
At ordinary temperature, it conducts heat better than any common liquid except mercury.
Water is the only natural substance that expands when it freezes, hence the density of ice is less than water - so it floats.
Water freezes more slowly than other liquids.
When the sun comes up in the morning, bodies of water warm up more slowly than the land, when it goes down at night, they cool off more slowly.
Water is never pure, it contains solute.
Electronic sensors such as
used for more convenient and efficient measurement of temperature in water.
It is most important factor which depends principally upon the amount of social chloride dissolved in it.
Salinity is lowest typically 30 parts per thousand near the estuaries of large rivers.
High salinity (70ppt) is recorded where rainfall is low and evaporation is high in the red sea.
The amount of salinity divides the aquatic environment into two main groups:
fresh water ecosystem
A vital component of all aquatic ecosystem.
Most oxygen is found on the surface of the water bodies especially in turbulent streams or when waves break.
The amount of dissolved oxygen in water can be severely altered due to human activity.
It depends upon the quantity of suspended material and floating organisms in the water.
Usually some of 50% of red, orange and yellow light is absorbed in the top 2m (61/2 ft)
20m (65 ft) only small amount of the blue green light remain to give its typical color.
The rapid removal of sunlight makes all aquatic ecosystems that are more than several meters deep into dark relatively cold environments.
Provides a living space estimated to 200 times larger than all the land of ecosystem.
Aquatic ecosystem can be divided into fresh water system (rivers and lakes) and marine systems (salt water).