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By Damon Donaldson Science 10 November 23, 2013


Bare Rock

Glacial Retreat This rock has been left bare after a glacial retreat due to Global Warming

Soil: None Species Diversity: No organisms present Trophic Levels: None Niches: No niches to be filled Nutrient Recycling: None


Primary Succession Stage 1: Pioneer Species

Lichen ( producer) growth on bare rock

Rise of the Lichen Here, the Lichen (a pioneer species) has inhabited the bare rock. The Lichen release chemicals that break down the rock and turn it into soil. Dead Lichen also release nutrients to help develop future growth

Soil: Very shallow Species diversity: Only lichen here Trophic levels: One producer Niches: Simple, Lichen to turn rock into soil Nutrient Recycling: Very minimal


Primary Succession

Stage 2: Early Colonizers

This grass began to grow on the soil (producer)

Some flowers have also started to appear (producer)

Grasses, flowers, and shrubs have begun to grow at this point. Some insects, such as grasshoppers ,worms, cicadas, and micro-organisms have appeared.

This Cicada is a primary consumer

Grasshopper (Primary Consumer)

Soil: soil is slowly becoming deeper Species diversity: some diversity, not a lot Trophic levels: two, producers and primary consumers

Niches: a few simple niches Nutrient Recycling: some nutrient recycling occurs


Primary Succession Stage 3: Opportunists

Deciduous Oak tree (Primary Producer)

Mushroom (Decomposer)

Tree seeds have been transported to the area from the animals. Deciduous trees start to grow and more animals begin to inhabit the place and small plants are replaced by plants that don't require as much sun.

Deer (Primary Consumer)

American Robin (Secondary Consumer)

Soil: Fairly deep, nutrient rich. Species diversity: Quite diverse Trophic levels: 3, producer, primary consumer, & secondary consumer Niches: Many niches, somewhat complex Nutrient Recycling: Quite a bit, not too complex


Primary Succession

Stage 4: Mature Forest/Climax Community

Douglas Fir Tree

Squirrel (Primary Consumer)

Tall Coniferous trees have populated the area and have shaded out the Deciduous trees. There is now a large species diversity including Tertiary consumers

Coyote (Secondary Consumer)

Mountain Lion (Tertiary Consumer)

Soil:Very deep, somewhat rich Species Diversity: Lots of Diversity Trophic Levels: 4 Niches: Very complex Nutrient Recycling: Very complex


Disturbance

FIRE! My forest has been destroyed by a massive forest fire. It destroyed everything and only left soil.

Soil: Deep and still somewhat fertile Species Diversity: Some grass and brush Trophic Levels: One Niches: Few Nutrient Recycling: Not much


Secondary Succession

Now Coniferous trees are beginning to grow back quickly and animals are inhabiting the forest once again, and the forest took a few decades to grow back completely.

Soil: Deep and still somewhat fertile Species Diversity :Lots Trophic Levels: 3-4 Niches: Many, complex Nutrient Recycling: Quit complex


Sources http://www.youtube.com/watch? v=TLpc71YOtcE http://en.wikipedia.org/wiki/Oldgrowth_forest http://www.britannica.com/EBchecked/topic/ 132754/coniferous-forest


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