1. Types of Interactions
Chapter 1: Lessons 2 & 3

2. Interactions with the Environment
Mathematically, populations can grow exponentially …so why don’t they?
Limiting Factors: the environment contains only so much food, water, living space, and other resources.
Example: if a population becomes too large, food becomes a limiting factor

3. Carrying Capacity: the largest population that an environment can support
Example: if there are more organisms than an environment can support the limiting factors cause the population to get smaller

4. Interactions Among Organisms
Competition: when 2 or more individuals or populations try to use the same limited resource. Competition may also occur within a population.
Predators & Prey:
Organism that is eaten is the prey
Organism that eats the prey is the predator

5. Predator Adaptations: in order to survive predators must be able to catch prey, and use a variety of techniques such as:
Speed
Camouflage
Prey Adaptations: in order to survive, prey must be able to avoid predation using techniques such as:
Traveling in large groups
poisonous

6. Symbiosis: a close, long-term association between 2 or more species
Types:
Mutualism: both organisms benefit
Coral & algae – algae produce the food and the coral provides a home for the algae
Commensalism: One organism benefits & the other is unaffected
Shark & remora – the remora rides around on the shark feeding off scraps
Parasitism: one benefits & the other is harmed
Parasite lives off of the host. The host is weakened in the process: tapeworm & human

7. Coevolution: a long-term change that takes place in two species because of their close interactions with one another.
Symbiotic relationships may result in coevolution
Flowers & pollinators show numerous examples & evidence of coevolution

8. Questions What is mutualism? Give an example of a parasite
Symbiotic relationship in which both organisms benefit
Give an example of a parasite ….
What is carrying capacity?
the largest population that an environment can support
What is a limiting factor?
Any resource that restricts the growth of a population of organisms