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Terrestrial Ecology


T Reyna

on 25 August 2011

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Transcript of Terrestrial Ecology

Ecology Transfer of Energy Environment Organism Organism Organism BGC
Cycyles Physical
Environment Human
Impact Biogeochemical Cycles Biomes predator-prey symbiosis trophic levels 64-72 69-72 The problem is
carrying capacity Population vs. Time Graph J-curve S-curve Closer to real life Carrying Capacity Linear Growth Mutualism Parasitism Commensalism What are the environmental effects of each? Helps one species but has little or no effect on the other One species feeds on part of another species. Biodiversity? Win - win relationship. Two species interact in a way that benefits both of them Food
Web Energy
Decreases Thermodynamics What do the arrows mean?
What is a niche?
How much energy do you think the organisms
get to "keep" at each stage? 10%
rule p. 70 2nd Law E sources Conservation
Energy Matter Sun Gravity Fusion/Nuclear p. 89 p. 82 Remember 10% rule? What happens to "wasted" energy? Levels
Organization Biotic
Abiotic photosynthesis respiration Carbon Phosphorous Nitrogen Water Fixation Assimilation Ammonification Denitrification Heat Capacity pp.46-52 Desert Tundra Grassland Forest Climate Vegetation Succession Human Impact Vegetation Climate Human Impact Succession Succession Vegetation Human Impact Climate Succession Climate Human Impact Vegetation H.I.P.P.O. Habitat Invasives Population Pollution Overharvest Reclamation This is the first step of the nitrogen cycle where bacteria convert atmospheric nitrogen to ammonia that can be used by plants. This is done by cyanobacteria or bacteria living on the nodules on the roots of plants. Ammonia is converted to nitrite then nitrate Assimilation: Plant roots absorb ammonium ions and nitrate ions for use in making molecules such as DNA, amino acids and proteins Nitrate ions and nitrite ions are converted into nitrous oxide and nitrogen gas.

This happens when a soil nutrient is reduced and released into the atmosphere as a gas. Ammonification: After nitrogen compounds have served their purpose in living organisms, decomposing bacteria convert the nitrogen-rich compounds, wastes and dead bodies into simpler compounds such as ammonia. We increase
biodiversity!! Could decrase the size of a population in a community Look at it another way: Some populations in a community "need " controlling. Hey, look! New habitats for
tree-frogs!! Commensalism
can increase biodiversity!! Direction of Energy Transfer "Multidimensional volume of resource axes"
More of a JOB than a PLACE Heat k Not much.
This is why we use fertilizer
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