2. Your Questoins!

3. Limiting Factor vs. Range of Tolerance
Limiting factors are things that prevent a population from growing any larger.
A macronutrient Predators Land Rainfall Proximity to others of the same species Temperature Sunlight pH Level
Range of Tolerance: the specific requirements for a population to live.
Example: Temperature, salinity, sunlight, pH

4. DDT and Bioaccumulation(absorbed or stored in organs) and Biomagnification (through a food chain)
Fig. 11-4
p. 231

5. Food web vs. Food chain

6. ENERGY PYRAMID Energy is lost with each trophic
~90% “lost”, is released to the environment as heat
~10% of the energy is used
Only about 10% of the energy from one level is passed on to the next level
10%
90%
10%
90%
10%
90%

7. Ecosphere or Biosphere Ecosystem
All earth's ecosystems
Ecosystem
Community of different species interacting with one another and with their nonliving environment of matter and energy
Community
Complex interacting network of plants, animals, and microorganisms
Habitat
Place where a population or individual organism naturally lives
Genetic Diversity
Populations that are dynamic groups that change in size, age distribution, density, and genetic composition as a result of changes in environmental conditions
Population
Group of interacting individuals of the same species that occupy a specific area at the same time

8. Systems – matter & energy flow
Open system- allows energy and mass to pass across the system boundary.
Closed system- allows energy but not mass across its system boundary.

9. Biomass Dry weight of all organic matter contained in organisms.
Biomass is measured in dry weight
Water is not source of energy or nutrient
Biomass of first trophic levels is dry mass of all producers
Useable energy transferred as biomass varies from 5%-20% (10% standard)

10. Storage of biomass at various trophic levels of ecosystem
Pyramid of Biomass
Storage of biomass at various trophic levels of ecosystem

11. Number of organisms at each trophic level
Pyramid of Numbers
Number of organisms at each trophic level