Interaction Among Living Things

Interaction Among Living Things

A. Adapting to Environment1. Natural Selection2. Adaptations3. Niche

B. Three types of interactions among organisms1. Competition2. Predation

a. Predation and populationb. adaptations

3. Symbiosisa. mutualismb. commensalismc. Parasitism

Adapting to EnvironmentNatural Selection

Process by which individuals that are best suited for

an environment pass on their unique characteristics to

their offspring

Natural Selection

Natural Selection has no intentions or senses; it cannot sense what

a species “needs.” If a population happens to have the genetic variation that allows some individuals to survive a particular challenge better than others, then those individuals will have more offspring in the next generation, and the population will evolve. If that genetic variation is not in the population, the population may still survive (but not evolve much) or it may die out. But it will not be granted what it “needs” by natural selection.

Adapting to Envirionment

Adaptations

Behaviors and physical characteristics that help

individuals live successfully in their environments

Adaptations

Adapting to Envirionment

Niche

The role of an organism in its habitat

Three types of interactions among organisms

Competition

The struggle between organisms to survive as they

attempt to use the same limited resources.

Competition

Three types of interactions among organisms

Predation

An interaction in which one organism kills another

organism for food.

Predation

PredationEffect of Predation on Population Size

If death rate of prey is greater than birth rate then prey

population falls. If prey population falls then predator

population falls. Both population rise and fall in related

cycles.

Predation

Interaction Among Living Things

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