Competition, Predation and Symbiosis

BellringerName a biotic factor in a forest.

Name two limiting factors for a population of lions.

What is carrying capacity?

A mouse eats acorns what is a mouse called in the food web? (Producer, Consumer, Decomposer)

CompetitionThere are three major types of

interactions among organisms:1. Competition2. Predation 3. Symbiosis

What are three major types of interactions among organisms?

CompetitionDifferent species can share the same

habitat and food requirements.Competition is the struggle

between organisms to survive as they attempt to use the same limited resource.

In any ecosystem, there is a limited amount of food, water and shelter.

Organisms that survive have adaptations that enable them to reduce competition.

What is competition?

What do organisms have to do in order to reduce competition?

An adaptation is a change that helps an organism, such as a plant or animal, survive in its environment.

PredationPredation is an interaction in

which one organism kills another for food.

The organism that does the killing for food is the predator.

The organisms that is killed for food is the prey.

What is predation?

What is the relationship between predator and prey?

Bellringer1. What is the difference between a food chain

and a food web?

2. Name three adaption that prey use to protect themselves against predators.

3. Who are nature’s recyclers?

SymbiosisSymbiosis – is a close

relationship between two species that benefits at least one of the species.

There are three types of symbiotic relationships:1. Mutualism2. Commensalism3. Parasitism

What is symbiosis?

What are the three types of symbiotic relationships?

Mutualism Mutualism – A relationship in which both species benefit.

Example:The relationship between the

Saguaro Cactus and Long Eared Bats. Cactus flowers provide bats with

food The cactus benefits because the

bats carry pollen from cactus to cactus on their noses.

What is Mutualism?

Mutualism A relationship in which both organisms benefit. They help each other.

Ex. A relationship between a butterfly and a flower

Clownfish and Sea Anemone

Butterfly and Flower

CommensalismCommensalism – Is a

relationship in which one species benefits and the other species is neither helped nor harmed.

Example – The red-tailed hawks’

interaction with the saguaro cactus . The hawks benefit by having a

place to build their nests. The cactus is not affected by the

hawks.

What is commensalism?

Commensalism

The Remora fish attaches to the shark and gets a free ride.

Birds build nests in trees.

CommensalismCommensalism is not very

common in nature because species are usually either helped or harmed a little by any interaction.

ParasitismParasitism – a relationship

when one organism is helped and the other is harmed.

The organism that benefits is called a parasite.

The organism that the parasite lives on or in is known as the host.

What is parasitism? What does a parasitic relationship consist of?

Parasitism

Wasp eggs on back of caterpillar.

Mosquito biting a human.

Sea lampreys feed on fluids of other

fish.

ParasitismCommon parasites are fleas,

ticks and leeches.These parasites have

adaptation that enable them to attach to their host and feed on their blood.

Other parasites live inside the host’s body such as tapeworms, that live inside the digestive systems of dogs, wolves, and some other mammals.

ParasitismUnlike predators, a parasite

does not usually kill the organism it feeds on.