Relationships Relationships among among

PopulationsPopulations

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Intraspecific CompetitionIntraspecific Competition: When : When members of the same species compete for members of the same species compete for resourcesresources

Interspecific CompetitionInterspecific Competition: When members : When members of different species compete for resourcesof different species compete for resources

When organisms compete for resources they When organisms compete for resources they limit the growth of a populationlimit the growth of a population

PredationPredation: An interaction where one : An interaction where one organism kills and hunts another organismorganism kills and hunts another organism

Predation affects population size by Predation affects population size by decreasing the prey population.decreasing the prey population.

Predators adapt to catch their prey by Predators adapt to catch their prey by avoiding prey that may be distasteful or avoiding prey that may be distasteful or poisonouspoisonous

Organisms adapt to avoid becoming prey Organisms adapt to avoid becoming prey through color patterns, having bright colors through color patterns, having bright colors to warn predators of their poisonous nature to warn predators of their poisonous nature or mimic colors of poisonous organismsor mimic colors of poisonous organisms

SymbiosisSymbiosis: a relationship in which two : a relationship in which two organisms of different species live in close organisms of different species live in close association and at least one organism benefitsassociation and at least one organism benefits

ParasitismParasitism: a symbiotic relationship where : a symbiotic relationship where the parasite benefits from the host by using the parasite benefits from the host by using some of its energy. This relationship may or some of its energy. This relationship may or may not kill the organismmay not kill the organism

MutualismMutualism: a symbiotic relationship where : a symbiotic relationship where both organisms benefit from the relationshipboth organisms benefit from the relationship

Being mutually beneficial can lead to Being mutually beneficial can lead to interdependency because on cannot survive interdependency because on cannot survive without the other. Ex. without the other. Ex.

CommensalismCommensalism: a symbiotic relationship : a symbiotic relationship where one organism benefits and the other is where one organism benefits and the other is not affectednot affected

InteractionInteractionss

Species 1Species 1 Species 2Species 2

CompetitioCompetitionn

Organism 1Organism 1

NegativeNegativeOrganism 2Organism 2

NegativeNegative

PredationPredationPredatorPredator

PositivePositivePreyPrey

NegativeNegative

ParasitismParasitismParasiteParasite

PositivePositiveHostHost

NegativeNegative

MutualismMutualismOrganism 1Organism 1

PositivePositiveOrganism 2Organism 2

PositivePositive

CommensalCommensalismism

Commensal Commensal OrganismOrganism

PositivePositive

Organism 2Organism 2

NeutralNeutral