Part One: The succession of the ecosystem shown in the animation in chapter 6 was an example of secondary succession. In secondary succession the soil is already there, but with primary succession that is not the case. Also secondary succession is an alteration in species composition that happens after something causes the current vegetation to die. In the animation, beavers built a damn to create a pond so they could then build a lodge. The dam stopped the flow of water from the stream and the water started to flood the valley. Over time the water rose in the forest creating the beaver pond. When the water rose it filled the soil around the trees, and once the tree roots became waterlogged they died. Sedge grass grew in the pond, and the roots began to form a bog mat. While the sedge grass grew, sphagnum moss and leatherleaf started to grow as well. The bog mat produces something called detritus which sinks to the bottom of the pond and begins a process that ends with the production of peat. Peat is the partially carbonized remains of plants. Humans use peat for
This is the end of the preview. Sign up
access the rest of the document.