Ecology Exam 1 Essay

1335 Words Nov 7th, 2013 6 Pages
Ecology Exam 1 Study Guide
Lecture 1- Introduction 1. Ecology is a science of interactions and multiple causal factors 2. Evolutionary history constrains ecological processes and systems 3. Ecological systems are open but resource limited 4. Biotic-biogeochemical cycling coupled through stoichiometry 5. Biotic-biophysical processes coupled through energy budgets 6. Ecological processes and systems are scale dependent
*An ecological system (or ecosystem) will have more trophic levels if there is more primary production

Lecture 2- Research
Scientific Method:
Observation/Research Question->Hypothesis->Experimental/Observational Study->Prediction

Graph: Increasing the amount of CO2 in
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f the continent
Soils- form from bedrock weather Factors Influencing Formation (Hans Jenny) * Climate * Organisms/Vegetation * Relief/Topography * Parent Material * Time
*Soils are important for plant production in terrestrial ecosystems because they are a source of mineral nutrients for plants
Soil Horizons:

Soil Texture/Size: Sand>Silt>Clay Fertility * Nutrient Cycling * Mineralization from soil organic matter * Inputs of carbon and decomposition rates * Cation Exchange Capacity (CEC) * Mineral nutrient retention in soils * CEC depends on soil texture organic matter

*Soils with a deeper A horizon will be more fertile based on soil organic matter content
*Fertility of the soil is influenced by mineralization rates from soil organic matter and CEC, but will also depend on: * Fertilization management * Atmospheric deposition of nutrients * Parent material

Lecture 5- Light, Energy & Primary Production
*Solar radiation causes the following when it reaches the earth’s surface: * Evaporation of water * Increases the temperature of organisms and other objects * Drives primary production

Photosynthetically Active Radiation (PAR) Photosynthesis: 6CO2 + 6H2O + Photons Magic C6H12O6 + 6O2

*Which type of photosynthetic pathway is most

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