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Geography 106
Eco Systems
14
Geography
Undergraduate 1
03/05/2013

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Cards

Term
Why couldn't mars support life?
Definition
Its water may have been to salty and acidic
Term
Four characteristics that make life work on Earth
Definition
Reproduction allows it to spread exponentially
Life uses various energy sources: plans sunlight, animals use plants
Life pollutes: organisms create waste in small amounts ok in large amounts not good at one point to much oxygen on earth
Life is versatile: different roles, evolution to use unexploited resources
Term
What does the biosphere consist of?
Definition
all living creatures
Term
What are the three other spheres?
Definition
atmosphere, hydrosphere, lithosphere
Term
What is a species?
Definition
individuals that if interbred would produce viable offspring
Term
what is a Population?
Definition
all individual of one species in a certain area
Term
What is a community
Definition
all individuals of a type of species in a certain area
Term
What is a Biome?
Definition
structurally distinct plant community
Term
What is an Ecosystem?
Definition
community of living organisms and their physical enviroment
Term
Describe Tolerance
Definition
all Living organisms have a quadratic tolerance curve showing the ability to tolerate different environmental states, low tolerance population is low, high tolerance population is high
where curves over lap there is much competition and were they don't there is no competition
Term
What is the ecological optimum point?
Definition
where tolerance is highest; the independent variable value where dependent variable growth and abundace are greatest
Term
Describe the three species interactions
Definition
competion is a lose lose
predation is a win lose
mutualism is a win win
Term
Describe tropic levels
Definition
3 levels primary is photosynthesis, next its herbavors then carnivors each succedeing level gets 10% less biomass due to respiration and that the whole orgainism may not be digested
Term
Describe bio diversity
Definition
highest near the equator lowest near the high latitiudes because more NPP in the lower equator means more plants and more animals and because species evolve to specialize on certain abundant food types in high NPP areas
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