Energy and Living Things. Outline. Energy Sources Solar-Powered Biosphere Photosynthetic Pathways Using Organic Molecules Chemical Composition and Nutrient Requirements Using Inorganic Molecules Energy Limitation Food Density and Animal Functional Response Optimal Foraging Theory.
Energy and Living Things
Energy Flows Through Living Systems
Capture and transfer light energy to chemical bonds
Not a perfect process – some energy is lost - entropy
How Photosynthesis Works
Only certain Wavelengths of Light are Used in Photosynthesis
Wavelengths most useful in driving photosynthesis
Absorption spectra of chlorophylls and carotenoids
Wavelengths not used - reflected
CO2 enters passively so stomata have to be open for long periods of time
Classes of Herbivores
How do plants respond to feeding pressures by herbivores?
How do animals respond?
Adaptations of Prey to being preyed upon
Mullerian mimicry: Comimicry
Batesian mimicry: Harmless species mimic noxious species
Aposomatic Coloring - Warning colors
Nutrient Cycling and Retention
Biological Nitrogen Fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by a pair of bacterial enzymes
Microbes Denitrification NO3- (nitrate) → NO2- → NO → N2O → N2 gas