1. Understanding Populations
How Species Interact with Each Other

2. Objectives Explain the difference between niche and habitat
Give examples of parts of a niche
Describe the five major types of interactions between species
Explain the difference between parasitism and predation

3. Niche The unique role of a species within an ecosystem Includes:
Species’ physical home
Species’ interactions with other organisms
Factors necessary for the species’ survival

4. Habitat Location where an organism resides Includes: Food Water
Shelter

5. Types of Interactions Adaptations to competition:
Competition- Different individuals or populations attempt to use the same limited resource
Niche overlap- Two different species
Indirect competition- Two competitors never come in direct contact
Adaptations to competition:
Niche restriction- Each species uses less of the niche than they are capable of using

6. Types of Interactions
Predation- Interaction including a predator and prey
Predator- Organism that feeds on another organism
Prey- Organism that is fed upon
Dynamic equilibrium- Pop. Numbers always changing, yet constant
Predation Adaptations:
Camouflage- Blending in with environment
Warning coloration- Striking coloration warning of chemical defenses
Mimicry- Species resembling each other
Protective covering- External defense against predation

7. Types of Interactions
Parasite- Organism that lives in or on another organism and feeds on the other organism
Host- The organism the parasite takes its nourishment from
Parasitism- Relationship between parasite and host
Mutualsim- Close relationship between two species in which each benefits the other
Ex. Acacia trees and ants

8. Types of Interactions
Commensalism- A relationship in which one species benefits and the other species is neither harmed nor benefited
Ex: Sharks and remoras
Symbiosis- Relationship between species in which at least one benefits
Coevolution- When two species evolve adaptations to benefit each other
Ex: Flowers and butterflies

9. Types of Interactions