IB 105 Lecture 6

Biotic –
Living portions of the environment
Predation, parasitism, competition, etc.
Abiotic –
Nonliving factors
Rain, soil type, temperature, etc.
5 Interactions among organisms
1. Predation 2. Competition 3. Parasitism 4. Commensalism 5. Mutualism
(+positive for consumer, -negative for prey)
2. Competition
Competition is a (- / – ) relationship
3. Parasitism
Parasitism is a (+ / – ) relationship
4. Commensalism —One organism benefits, while the other is unaffected.
Commensalism is a ( + / 0 ) relationship
5. Mutualism
– Both species benefit (+/+).
Understand food webs and degrees of separation within them
See slides
2 degrees of separation
Recognize examples of the types of species interactions.
See slides
5.Explain how humans influence these interactions.
1) Introduced species
2) Habitat destruction
or alteration
3) Hunting / exploitation
6.List some strategies used by prey species to avoid being eaten.
Mullerian Mimicry: 2 or more distasteful or harmful organisms resemble each other
Batesian Mimicry: defenseless species (mimic) is protected from predation by its resemblance to a species that is dangerous
Warning Coloration: conspicuous to convey threat
Cryptic Coloration: blend in with environment
Sit-and-wait predators: motionless until prey close enough to strike