{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 11 Eco2B

Lecture 11 Eco2B - Overview Ecosystem Ecology Next...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
2/24/09 1 Next week (week of March 2 – 6) bring a calculator to discussion section Overview - Ecosystem Ecology I. Energy flows A. Primary production 1. marine 2. freshwater 3. terrestrial B. Secondary production 1. production efficiency 2. trophic efficiency II. Why is the world green? III. Nutrient cycles: water, C, N, P IV. Hubbard Brook Review trophic structure the feeding relationships between organisms in a community Secondary Production All the growth and reproduction by consumers When a caterpillar feeds on a plant leaf – Only about one-sixth of the energy in the leaf is used for secondary production (new growth) Plant material eaten by caterpillar Cellular respiration Growth (new biomass) Feces 100 J 33 J 200 J 67 J
Background image of page 1

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

View Full Document Right Arrow Icon
2/24/09 2 1. Production Efficiency fraction of assimilated energy (food) that is used for secondary production = energy for biomass (2ndary production) energy for biomass + cellular respiration Production efficiencies Birds, mammals 1-3% (endotherms) Fish 10% (ectotherms) Insects 40% (ectotherms) 2. Trophic efficiency
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}