1 / 10

Repairing the damage

Wangari Maathai. Repairing the damage. The Greenbelt Movement planting trees in Kenya restoring a sustainable ecosystem establishing democracy empowering women. Nobel Peace prize 2004. 7800 acres. Studying ecosystems. 38 acre deforestation. Hubbard Brook Experimental Forest.

kamea
Télécharger la présentation

Repairing the damage

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Wangari Maathai Repairing the damage • The Greenbelt Movement • planting trees in Kenya • restoring a sustainable ecosystem • establishing democracy • empowering women Nobel Peace prize 2004

  2. 7800 acres Studying ecosystems 38 acre deforestation Hubbard Brook Experimental Forest

  3. Effects of deforestation 40% increase in runoff • loss of water • 60x loss in nitrogen • 10x loss in calcium loss into surface water nitrate levels in runoff 80 40 loss out of ecosystem! Concentration of nitrate (mg/l ) 4 Deforestation 2 Why isnitrogen soimportant? 0 1965 1966 1967 1968 Year

  4. Ecosystem inputs biosphere energy flowsthrough nutrients cycle inputs • energy • nutrients

  5. loss of energy loss of energy Energy flows through ecosystems sun secondary consumers (carnivores) primary consumers (herbivores) producers (plants)

  6. sun Food chains Level 4 Tertiary consumer top carnivore • Trophic levels • feeding relationships • start with energy from the sun • captured byplants • 1st level of all food chains • food chains usually go up only 4 or 5 levels • inefficiency of energy transfer • all levels connect to decomposers Level 3 Secondary consumer carnivore Level 2 Primary consumer heterotrophs herbivore Level 1 Producer autotrophs Fungi Decomposers Bacteria

  7. sun energy lost todaily living energy lost todaily living Inefficiency of energy transfer • Loss of energy between levels of food chain • To where is the energy lost? The cost of living! 17% growth only this energymoves on to the next level in the food chain 33% cellular respiration 50% waste (feces)

  8. sun Ecological pyramid • Loss of energy between levels of food chain • can feed fewer animals in each level 1 100 100,000 1,000,000,000

  9. Humans in food chains • Dynamics of energy through ecosystems have important implications for human populations • how much energy does it take to feed a human? • if we are meat eaters? • if we are vegetarian? What is yourecological footprint?!

  10. Food webs • Food chains are linked together into food webs • Who eats whom? • a species may weave into web at more than one level • bears • humans • eating meat? • eating plants?

More Related