Ch 54 - 0 1 2 3 Chapter 54 Ecosystems Understand what...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 54 - Ecosystems 0. Understand what limits production 1. Understand energy flow and how to calculate production and ecological efficiencies 2. Know major biogeochemical cycles and how man has modified them 3. Understand what causes acid rain and ozone depletion Figure 54.2 An overview of ecosystem dynamics Food Chain Models 4. About 1 % of solar energy is trapped by plants for primary production (gC/m 2 /yr) 5. About 10 % transferred to other levels 6. Difference between gross and net productivity (NP = GP - R) 7. Biomass equals accumulated production (gC/m 2 ) Figure 54.4 Primary production of different ecosystems Limits to Productio n 0. Terrestrial primary production limited by rainfall and nutrients (primarily nitrogen) 1. Aquatic production limited by light penetration and nutrients (Phosphorus in fw, N in marine) 2. Secondary production is sum of all higher trophic levels 3. 10 % is only approximate , at spring in Florida, producers have 12,382 g/m2/yr, herbivores 8,045, carnivores 362, and top carnivores 21 4. Pyramids of biomass can be inverted, pyramids of energy flow
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/02/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

Page1 / 3

Ch 54 - 0 1 2 3 Chapter 54 Ecosystems Understand what...

This preview shows document pages 1 - 2. Sign up to view the full document.

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