Tuesday, May 25, 2010

Promote Global WORMING! Decomposers in the Biotic Pyramid

Primary succession, showing small tree growing with small amount of soil by Martin LaBar
Attribution-NonCommercial License
What is a Decomposer? What role do Decomposers play in the process of environmental succession within the Biotic Pyramid? What types of living things are considered Decomposers in the Biotic Pyramid? 

In the process of primary and secondary succession, bare rock becomes covered with plants, as well as animals. At first there is little soil, so life is tenuous. As time goes by, the decomposers and small plants begin to wear down the bare rock, and the variety of  life 

Succession in bodies of water, especially fresh water ponds and lakes is similar to bare rock succession. The difference is that water replaces the rock. Decomposers such as worms depend on a moderate level of water in the soil to survive, so they cannot live in either of the first stages of bare rock succession or pond succession.

To help students gain an understanding of succession, the leader (teacher) will use the Project Wild Aquatic activity, Pond Succession, found on pages 66-68. A fieldtrip to a variety of natural environments in the various stages of succession would be a wonderful way to provide students with an opportunity to see these NATURAL environmental changes.

The Beth Chatto Gardens Float My Boat! by antonychammond (playing catchup!)
Attribution-NonCommercial-ShareAlike License
The objectives of Pond Succession would be the same as that of Bare Rock Succession. If you wanted to substitute Bare Rock Succession for Pond Succession that is fine. Remember our focus is on the worms and similar decomposers, so the students will need information about the worm's habitat. Then the worms can be added into the right stage of either type of succession. The objectives are listed below.
In this activity, students will:
  1. recognize that natural environments are involved in a process of continual change.
  2. discuss the concept of succession.
  3. describe succession as an example of the process of change in natural environments. AND
  4. apply understanding by drawing a series of pictures showing stages in pond succession.
When the learners, students, apply understanding of succession, by drawing a series of pictures, showing stages of succession or keeping a log or diary of a related fieldtrip, the teacher should use this as their evaluation (assessment) for this activity.

1 comment:

Anonymous said...

Sorry for my bad english. Thank you so much for your good post. Your post helped me in my college assignment, If you can provide me more details please email me.