Chapter 5 - o Young pine forest and developing understory...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5 Ecosystems change! Not static o Seasons, weather, life cycles Disturbances to Ecosystems o Natural disasters (volcano, fire, hurricanes, floods, avalanches) o Man-made (clear cut, mountaintop mining, pollution, agriculture, non- native species) Disturbances will alter the ecosystem not necessarily for good or bad, just different Development Primary Succession: bare rocks o No soil, no organic matter, slower (1000s of years) o Bare lava (Hawaii) Secondary succession: abandoned fields (bare soil) o Oil soil, organic matter, faster (100s of years) Primary Succession I and II o Pioneers Rocks, lichens, mosses soil Then Succession III: Grasses and herbaceous plants (non woody stems) Succession IV: shrubs=woody stems Succession V: young forest Climax forest is stable as long as climate remains the same Each biome has different climax community Secondary Succession o Annual weeds o Annual and perennial weeds (annuals die and their seeds grow, perennials return every season) o Pine seedlings and saplings
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o Young pine forest and developing understory of hardwoods o Mature hardwood forests Aquatic Succession o Nutrient enrichment, break down of organisms in the pond o Climax community can be same as terrestrial habitat, marsh or wetland Dynamics Equilibrium: constant adjustment to change maintains over all balance through three factors o Feedbacks Positive: outputs that promote the current trend Negative: outputs that interfere with the current trend Inertia: resistance to change One change in the nutrients in a ecosystem can greatly affect all life living there: Great Lakes and phosphorous o Species interactions o Population dynamics Example of Positive Feedback which has a negative outcome: CO2 raises temperature, ice melt reduce albedo (reflective energy from ice) increase temperature Example of Negative Feedback: grasslands shrubs FIRE (would become trees if not for this output) grasslands...
View Full Document

Page1 / 2

Chapter 5 - o Young pine forest and developing understory...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online