1. Ecology Study of interactions among living things &
between living things and their environment

2. Abiotic Factors Sunlight (hours/day, intensity, shade)
Soil type (amount/type of organic matter)
Nutrients (nitrogen, phosphorous, carbon)
Water
Detritus
Temperature
pH & salt content

3. Biotic Factors Include all Living things
Two types of interactions among living things
1)Interspecific =
between different species
2)Intraspecific =
within the same species

4. Levels of organization in an Ecosystem
Population = all organisms of one species living in the study area
Community = all of the organisms living in the study area
Ecosystem = all of the organisms living in the study area and the abiotic factors.
Biome = several ecosystems in same climate

5. Biosphere Includes all of the biomes on earth
All areas of the planet that support life

6. Examples of Interactions
1) Predation =
(+,-) One predator kills and eats
more than one prey organism

7. 2) Parasitoid =
(+,-) One parasitoid kills and eats
one host organism.

8. 3) Herbivory :
(+,-)herbivore eats plant

9. 4)Competition = (-,-) 2 organisms compete for resources
Intraspecific and interspecific

10. Symbiotic Relationships
Organisms live closley together
Names end in –ism
Parasitism
Mutualism
Commensalism

11. 5) Parasitism = (+,-) Many parasites feed on
one host organism….try not to kill host

12. 6) Mutualism =
(+,+) symbiotic relationship where
both benefit

13. 7) Commensalism = (+,0) one organism benefits
the other is not affected