Bio 107 General Ecology

1. BIO 107 LECTURE 3
Instructor:ANGELIVALERA- MAG-ASO

2. Light•Light
•Organic molecules
•Inorganic molecules

4. Heterotrophic Photosynthetic Chemosynthetic
Bacteria
ProtistsProtists
Plants
Fungi
Animals

5. ProducersProducers
((autotrophsautotrophs))
ProducersProducers
((autotrophsautotrophs))
ConsumersConsumersConsumersConsumersConsumersConsumers
((heterotrophsheterotrophs)
ConsumersConsumers
((heterotrophsheterotrophs)
DecomposersDecomposersDecomposersDecomposers

6. Food chains describe the energy flow in ecosystemsFood chains describe the energy flow in ecosystems

8. ECOSYSTEMS HAVETWO MAJOR FOOD CHAINS:

9. ECOSYSTEMS HAVETWO MAJOR FOOD CHAINS:

12. Pyramid of
energy flow
Pyramid of
energy flow
Fig. 4-20 p. 79
Pyramid of
biomass
Pyramid of
biomass

14. Primary production –Energy accumulated by
plants; first and basic form of energy storage
Gross primary production –Total energy
assimilated by the plant; total photosynthesisassimilated by the plant; total photosynthesis
Net primary production–Energy remaining
after respiration and stored as organic
matter.
GPP – R = NPP

16. Using Light and Carbon dioxide
6H2O + 6CO2 ----------> C6H12O6+ 6O2

17. Cross section

20. C3 Photosynthesis

21. C4 Photosynthesis

23. CrassulaceanAcid Metabolism
Mesophyll cells at
night Mesophyll cells
dur ing thedur ing the
day
Pyruvate build-up during
the day is converted to
PEP, which combines with
CO2 the next night

24. Ratio of Carbon to Nitrogen across Biological Kingdoms (Spector, 1956)
25
0
5
10
15
20
25
Plants Animals Fungi Bacteria

25. Proportion of temperate and tropical plant bearing toxic alkaloids
(Coley andAide, 1991)
Specieswithalkaloids(%)
0
5
10
15
20
25
30
35
Temperate Tropical
Specieswithalkaloids(%)

26. NitrogenContent of live and dead leaves (Killingbeck andWhitford, 1996)
2.5
0
0.5
1
1.5
2
2.5
Live Dead
NitrogenContent(%)