Presentation on theme: "Organism Relationships"— Presentation transcript:
1 Organism Relationships S7L4dCategorize relationships between organisms that are competitive or mutually beneficial.
2 Each organism in an ecosystem interrelates with the other members Each organism in an ecosystem interrelates with the other members. These relationships fall into one of three categories:SymbiosisCompetitionPredation
3 Symbiotic Relationship A long-term association between two members of a community in which one or both parties benefitThree types of symbiotic relationships:CommensalismMutualismParasitism
4 Mutualism Beneficial to both organisms Example: Protozoa living in termite intestineProtozoa break down wood the termite eats, while the termite provides food and shelter for the protozoa
5 Commensalism One member benefits and the other is unaffected Barnacles that live on a whaleBarnacles don’t harm or feed on whale. They hitch a ride on the slow moving whale in order to catch plankton and other food in the waterWhale is neither benefited nor harmed
6 ParasitismBenefits one organism (parasite), but harms the other (host)Tapeworms in a human are parasitesTapeworm benefits by getting its nutrition from the intestines of its human hostHost is harmed because there are not as many nutrients to absorb into its body.
7 A resource could be food, water, light, ground space or nesting space Competitive RelationshipWhen two or more organisms seek the same limited resource, they compete with each other.A resource could be food, water, light, ground space or nesting spaceCompetion can be intraspecific or interspecific.Intraspecies competetion occurs between members of the same speciesInterspecies competition occurs between members of different species
8 Predation Predator is an organism that feeds off of another organism Prey is the organism it feeds onSea lions hunt down and kill herringThey harry the edges of the school of fish and eat until they have killed all the weak and sick animalsSounds cruel, but without predation, competition and disease, there would be no natural limitations on population growth
9 May seem brutal that organisms feed off one another and awful that organisms perish from losing resources or getting disease, but the alternative is even more disastrous:AN EVER-MORE-CROWDED WORLD IN WHICH EVERY POPULATION INCREASED UNTIL THERE WAS NO SPACE OR FOOD LEFT FOR ANYTHING OR ANYONE!Ecological balances are important!