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Introduction to Ecology
Ecology and levels of organization
27
Biology
9th Grade
02/08/2012

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Term
Ecology
Definition
The scientific study of living organisms and their relationships with each other and their environment.
Term
How can we study ecology?
Definition
By doing experiments, making observation, and making models.
Term
Biosphere
Definition
The portion of the Earth that supports life
Term
Biotic factors
Definition
Factors in an organism's environment that are alive
Term
Examples of biotic factors
Definition
Bacteria, plants, other animals
Term
Abiotic factors
Definition
Non-living factors in an organisms's environment
Term
Examples of abiotic factors
Definition
Temperature, sunlight, rainfall, minerals in soil, wind
Term
Population
Definition
a group of organisms of the same species that interbreed and live in the same location
Term
Community
Definition
All the populations of species that live in the same place at the same time
Term
Ecosystem
Definition
All the living organisms of a community and the abiotic factors that affect it.
Term
Biome
Definition
A large group of ecosystems that share the same climate and have similar types of communities
Term
Habitat
Definition
An area where an organism lives - it's address.
Term
Niche
Definition
The role or position that an organism has in its environment - how it gets it food, shelter, etc. It's occupation.
Term
Competition
Definition
In interaction where more than one organism uses a resource at the same time.
Term
Predation
Definition
The act of one organism consuming (eating) another organism for food
Term
Predator
Definition
The organisms that pursues another organism - the hunter
Term
Prey
Definition
The organism that is hunted for food.
Term
Symbiosis
Definition
Two different species living closely together.
Term
Mutualism
Definition
Symbiotic relationship where both organisms benefit.
Term
Example of mutualism
Definition
Lichen - a relationship between an alga and a fungus.
Term
Commensalism
Definition
Symbiotic relationship where one organism benefits and the other is not helped or harmed.
Term
Example of commensalism
Definition
Cattle and birds: the cow eats grass and disturbs insects. The birds eat the insects but the cow doesn't benefit.
Term
Parasitism
Definition
Symbiotic relationship where one organism benefits and one is harmed.
Term
Ectoparasite
Definition
Parasite that feeds on the surface of the host organism.
Term
Examples of an ectoparasite
Definition
Lice, leeches, ticks
Term
Endoparasite
Definition
Parasite that lives inside the body of the host
Term
Examples of endoparasites
Definition
Tapeworms, ringworm
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