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| The study of how organisms interact with the environment both living and nonliving. |
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| A group of individuals of one species living in the same place at the same time. |
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| A group of populations living at the same place at the same time. |
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| A community and its environment. Abiotic and biotic factors in one place. |
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| A portion of Earth that can support life |
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| The area where an organism lives out its life. |
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| The role or position an organism fills in the ecosystem. |
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Earthworm: eats bacteria and replaces nutrients in the soil.
Bees: pollinate plants and spread seeds and pollen.
Trees: Produce oxygen and food |
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| The study of the growth, abundance, and distribution of populations. |
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| Represented by N. Is the total number of individuals. |
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How many organisms are in one area. (10 lions per km^2 or 100 mosquitoes/m^3)
To get appropriate density, a appropriate size of space needs to be considered. |
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| Clumped, uniform, or random. How the population is grouped together. |
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| An orange grove with each tree the same specific distance away from each other. |
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| A graph with age categories. It determines the growth of populations and relative number in each category Has pyramid type of structure with tiers of equal width. |
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| The graph will look like a pyramid, smaller at the top and biggest at the bottom. Each tier getting gradually bigger from top to bottom. |
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| Not a uniform pyramid. The tiers will slowly get bigger or smaller, but the bottom will always be bigger then the top. |
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| Not a uniform pyramid, tiers can become bigger or smaller. The bottom will always be smaller than the top. |
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| A graph comparing the life span to the average age that species lives to. |
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| Most likely to die when old. (humans) |
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| Equal chance of death at any age. (squirrels) |
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| Most individuals die young. (oysters) |
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| The maximum growth rate of a population under ideal conditions. |
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| The maximum number of individuals of a population that can be sustained by a particular habitat. |
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| Density-dependent factors |
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Definition
Those agents whose limiting effects become more intense and the population increases. Most likely biotic.
Example: Disease or competition for food |
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| Density-independent factors |
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Definition
Occur regardless of population size. Most likely abiotic.
Example: Fire, volcanic eruptions, and hurricanes. |
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If r is zero: population is constant and at carrying capacity.
If r is positive: population is increasing.
If r is negative: population is decreasing. |
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| reproductive rate + N is population size. |
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| When the reproductive rate is the maximum (biotic potential). |
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| Occurs when birth - death = zero. |
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