Testing preconceptions Connecting concepts and Big ideas Where
Testing preconceptions Connecting concepts and “Big” ideas
Where does most of the mass in this piece of wood come from? 1. Air 2. Soil 3. Water 4. Nutrients dissolved in water
Where does most of the mass in this piece of wood come from? 1. Air 2. Soil 3. Water 4. Nutrients dissolved in water
What is the basic molecule from which this mass is derived? 1. N 2 2. O 2 3. CO 2 4. H 2 O
What is the basic molecule from which this mass is derived? 1. N 2 2. O 2 3. CO 2 4. H 2 O
Answer to Q 1 provided prior to Q 2 Answer to Q 1 NOT provided prior to Q 2
Photosynthesis – part of a big idea, a spanning idea THE PERSPECTIVE OF AN ECOLOGIST Energy and Ecosystems Plant physiology Cell biology Chemistry Anatomy Psynth Carbon from Air Carbon Fixation Net Primary productivity Joining biological and abiological Energy flow Nutrient cycles Human impacts Limiting factors Feedbacks
Starch Cellulose
Calvin Cycle – light independent Carbon CO 2 RUBISCO Ru. BP 3 PG CARBOX ATP ADP ATP REGEN REDUCT NADPH NADP+ G 3 P
Temperature and Enzyme Activity for the two is not on the same scale
Psynth & Patterns of Primary Productivity 3 2 1 0 kg. C/m 2 -yr
Energy & Nutrient dynamics • Primary production • Secondary production energy flow Psynth and CO 2 fixation 54. 1
The Carbon Cycle photosynthesis Green plants res pir ati on Atmosphere Consumers Detritivores microbes Detritus Ocean Fossil fuel Sediments
Energy/biomass transfer Food chain--system level Florida Bog Trophic efficiency (%) 14% 29% 4. 6% Trophic efficiency is the percentage of production (energy) transferred from one trophic level to the next to form new biomass
Human Alterations to Global Carbon Dynamics 6. 3 -6. 5 billion metric tonnes! 1. 8 -2 billion
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