IB 105 Lecture 6

Biotic –
Living portions of the environmentPredation, parasitism, competition, etc.
Abiotic –
Nonliving factorsRain, soil type, temperature, etc.
5 Interactions among organisms
1. Predation 2.

Competition 3. Parasitism 4. Commensalism 5. Mutualism

Predation
(+positive for consumer, -negative for prey)
2. Competition
Competition is a (- / – ) relationship
3.

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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 slides2 degrees of separation
Recognize examples of the types of species interactions.
See slides
5.Explain how humans influence these interactions.
1) Introduced species2) Habitat destruction or alteration3) 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 otherBatesian Mimicry: defenseless species (mimic) is protected from predation by its resemblance to a species that is dangerousWarning Coloration: conspicuous to convey threatCryptic Coloration: blend in with environmentSit-and-wait predators: motionless until prey close enough to strike