EcosystemsLect3-1

EcosystemsLect3-1 - Dynamics of Ecosystems Chapter 57 1 2...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Dynamics of Ecosystems Chapter 57
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2
Background image of page 2
3 Biogeochemical Cycles Ecosystem: any place in nature – some degree of permanence where energy flows and nutrients/minerals cycle between the biotic (living) and abiotic (non-living) parts of the area. Biogeochemical cycles: chemicals cycling through ecosystems between biotic and abiotic
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4
Background image of page 4
5 Biogeochemical Cycles Molecules have a source and sink – Atmosphere Lithosphere Hydrosphere Biogeochemical cycles usually cross ecosystem boundaries Carbon is a major molecule
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Biogeochemical Cycles The carbon cycle – source = Atmosphere
Background image of page 6
7 Biogeochemical Cycles Carbon fixation: changing CO 2 from a gas into organic compounds through photosynthesis. CO 2 + H 2 O C 6 H 12 O 6 + O 2
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Biogeochemical Cycles Methane producers Microbes produce by anaerobic cellular respiration Methanogens: produce methane (CH 4 ) Wetland/tundra ecosystems are a source of CH 4 –CH 4 is oxidized to CO 2 , but can remain as CH 4 for a long time
Background image of page 8
9 Biogeochemical Cycles Existing fossil fuels (coal, crude, gas) were formed over geological time Human burning of fossil fuels is creating large imbalances in the carbon cycle The concentration of CO 2 in the atmosphere is increasing year by year
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Increase in CO 2 10
Background image of page 10
Cycling vs Sustainability vs Subsidization 11 We use ~100-1000X more calories for peripherals than calories for food. The difference???
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cycling vs Sustainability vs Subsidization 12 H 2 CO 3
Background image of page 12
Earth’s Estimated Biocapacity 13
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Violating the principle of cycling 14 Why doesn’t DDT cycle?
Background image of page 14
15 Biogeochemical Cycles Water Cycle – Source = Hydrosphere and Atmosphere All life depends on the presence of water Water availability determines the nature and abundance of organisms Living Organisms Synthesize during cellular respiration Disassemble during photosynthesis
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 16
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/06/2011 for the course BIOL 1105 at Virginia Tech.

Page1 / 52

EcosystemsLect3-1 - Dynamics of Ecosystems Chapter 57 1 2...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online