BELLRINGER:

1. List five reasons why organisms would compete with each other.

Put this in the second box of your bellringer page

• Ecology is the study of interactions that take place between organisms and their environment.

(Where they live, what they eat, and what eats them)

SHARING THE WORLD

• In Biology we study the portion of Earth that supports life- Biosphere

• It extends from high in the atmosphere to the bottom of the oceans.

BIOSPHERE

• Ecologists have organized the living world into levels—

• the organism by itself

• population

• community

• and ecosystem

LEVELS OF ORGANIZATION

• An individual living thing that is made of cells, uses energy, reproduces, responds, grows, and develops.

LEVELS OF ORGANIZATION

ORGANISM

• A population is a group of organisms, all of the same species, which interbreed and live in the same area at the same time.

LEVELS OF ORGANIZATION

POPULATION

LEVELS OF ORGANIZATION

COMMUNITY

• A biological community is made up of interacting populations in a certain area at a certain time.

• A change in one population in a community may cause changes in the other populations.

COMMUNITY

• Biological communities that interact with each other in a given area and with the abiotic

components of that area.

LEVELS OF ORGANIZATIONECOSYSTEM

• A relationship between organisms of different species is called symbiosis.

• Four kinds of symbiosis are recognized:

1. mutualism,

2. commensalism,

3. parasitism,

4. predator/prey.

SYMBIOSIS

• A symbiotic relationship in which both species benefit is

called mutualism.

SYMBIOSIS

Mutualism

• Commensalism is a symbiotic relationship in which one species benefits and the other species is unaffected.

SYMBIOSISCommensalism

• A symbiotic relationship one species benefits and the other is harmed is called parasitism.

SYMBIOSISParasitism

• Parasites have evolved in such a way that they harm, but usually do not kill the host species.

SYMBIOSISParasitism

Tape Worms in Intestine

• In a predator and prey relationship one species is benefitted and the other is killed.

Predators seek out and eat other organisms.

• Predation is found in all ecosystems and includes organisms that eat plants and animals.

• A habitat is the place WHERE an organism

lives out its life.

ORGANISMS IN ECOSYSTEMS

A niche is the WAY an organism lives out it’s life—

• how it meets its specific needs for food and shelter

• how it survives,

• and where it reproduces in its environment.

ORGANISMS IN ECOSYSTEMS

• Why is thought that two species can’t exist for long in the same community if their niches are the same?

ORGANISMS IN ECOSYSTEMS

Table of Contents: Symbiosis Notes

Attach the notes on page 4