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Contents contributed and discussions participated by Megan G

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Megan G

The freshwater biome - 0 views

www.ucmp.berkeley.edu/...freshwater.php

shared by Megan G on 14 Nov 11 - Cached
    • Megan G
      Megan G on 14 Nov 11
       
      I'm interested in the Great Blue Heron . - Megan G. 
Megan G

Earth Floor: Biomes - 0 views

www.cotf.edu/...biomes.html

shared by Megan G on 03 Nov 11 - Cached
  • Megan G on 03 Nov 11
     
    - Megan's 2nd one . 
Megan G

The Aquatic Biome - 1 views

www.ucmp.berkeley.edu/...aquatic.html

shared by Megan G on 03 Nov 11 - Cached
  • Temperature varies in ponds and lakes seasonally. During the summer, the temperature can range from 4° C near the bottom to 22° C at the top. During the winter, the temperature at the bottom can be 4° C while the top is 0° C (ice). In between the two layers, there is a narrow zone called the thermocline where the temperature of the water changes rapidly. During the spring and fall seasons, there is a mixing of the top and bottom layers, usually due to winds, which results in a uniform water temperature of around 4° C. This mixing also circulates oxygen throughout the lake. Of course there are many lakes and ponds that do not freeze during the winter, thus the top layer would be a little warmer.
  • Water is the common link among the five biomes and it makes up the largest part of the biosphere, covering nearly 75% of the Earth’s surface. Aquatic regions house numerous species of plants and animals, both large and small. In fact, this is where life began billions of years ago when amino acids first started to come together. Without water, most life forms would be unable to sustain themselves and the Earth would be a barren, desert-like place. Although water temperatures can vary widely, aquatic areas tend to be more humid and the air temperature on the cooler side. The aquatic biome can be broken down into two basic regions, freshwater (i.e, ponds and rivers) and marine (i.e, oceans and estuaries). Freshwater Regions Freshwater is defined as having a low salt concentration—usually less than 1%. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt c
  • oncentration (i.e, ocean)
  • ...8 more annotations...
  • The topmost zone near the shore of a lake or pond is the littoral zone. This zone is the warmest since it is shallow and can absorb more of the Sun’s heat. It sustains a fairly diverse community, which can include several species of algae (like diatoms), rooted and floating aquatic plants, grazing snails, clams, insects, crustaceans, fishes, and amphibians. In the case of the insects, such as dragonflies and midges, only the egg and larvae stages are found in this zone. The vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks.
  • Wetlands
  • Streams and Rivers
  • onds and Lakes
  • Freshwater Regions
  • These regions range in size from just a few square meters to thousands of square kilometers. Scattered throughout the earth, several are remnants from the Pleistocene glaciation. Many ponds are seasonal, lasting just a couple of months (such as sessile pools) while lakes may exist for hundreds of years or more. Ponds and lakes may have limited species diversity since they are often isolated from one another and from other water sources like rivers and oceans. Lakes and ponds are divided into three different “zones” which are usually determined by depth and distance from the shoreline.
  • Marine Regions
  • Oceans
  • Megan G on 03 Nov 11
     
    - Megan's 1st one .
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