Major categories of freshwater ecosystems

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Name: Eleazar Salazar Oviedo

Group: 321

Competence: Bases opinions about impacts of science and technology in his daily life, taking ethical considerations.

Stage: 3rd.

Major categories of freshwater ecosystems.

1. Rivers and Streams:

Origin: underground water sources in mountains or hills, near a source, water has plenty of dissolved oxygen but little plant life.

The rivers provide water, transport and deposition half residues. The total area occupied is small but are used more intensely ecosystems by man.The characteristics of the river changes from its source to its mouth because its size and volume of water increase. During underwater slows and becomes muddy, decreasing light and photosynthesis accordingly. Heterotrophic Current is a small range of species in the trophic levels.

2. Lakes and ponds.

A pond is a body of water shallow enough to support rooted plants. Many times plants grow all the way across a shallow pond.

Water temperature is fairly even from top to bottom and changes with air temperature. Plants can, and often do, grow along the pond edge. The amount of dissolved oxygen may vary greatly during a day. In really cold places, the entire pond can freeze solid.

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.

3. Freshwater Wetlands.

Natural wetlands are lands which, due to geological or ecological factors, have a natural supply of water—either from tidal flows, flooding rivers, connections with groundwater, or because they are perched above aquifers or potholes. Wetlands are covered or soaked for at least a part, and often all, of the year. This makes wetlands intermediaries between terrestrial and aquatic ecosystems. They are neither one nor the other, and yet they are both.

Why are estuaries so important?

Estuaries are very important! They provide help to the environment and the economy. They provide homes for many different plants and animals.

These ecosystems also help to keep marine environments clean. Estuaries provide economic, cultural and ecological benefits to communities. Two ecosystem services that estuaries provide are habitat protection and water filtration.

Are more productive ecosystem estuaries. Many coastal communities make their living from transportation, fishing and tourism around the estuary.

Zones in which is divided the ocean:

1. Intertial zone: The intertidal zone, also known as the littoral zone, in marine aquatic environments is the area of the foreshore and seabed that is exposed to the air at low tide and submerged at high tide, ie the area between tide marks.

In the intertidal zone the most common organisms are small and most are relatively uncomplicated organisms.

2. Coastal Ocean: The continental shelf is the area extending from the coast to the shelf break, which is usually defined by the 200 meter depth isobaths. The continental margin is the transition zone between the continental crust and the oceanic crust, including the coastal plain, continental shelf, slope and rise. The coastal ocean is the portion of the global ocean where physical, biological and biogeochemical processes are directly affected by land. It is either defined as the part of the global ocean covering the continental shelf or the continental margin.

3. Open ocean:

A) The open Ocean Photic Zone: The photic zone is the illuminated area, ranging from the sea surface to about 200 meters deep. This is the area where the most popular marine life: most of the fish, jellyfish, snails, octopuses, crabs, algae, etc. Throughout this area there is light, but from 100 meters deep and the light is very low and is not sufficient for algae and other living things perform photosynthesis.

B) The

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