Ths general biology unit 1 our environment population changes and growth_v1516
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Unit 1 Notes:
Populations
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Where did we come from?•The processes that individual organisms do to convert and cycle energy and matter throughout an ecosystem.
•Photosynthesis, Cellular Respiration, Food Chains/Webs
Where are we going?
•The processes that impact the ability of groups of organisms to cycle energy and matter throughout an ecosystem.
•Population Changes, Biodiversity, Human Impact, Climate Change
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(1) Ecosystem Levels•Organism: 1 living thing.
•Population: A group of the same types of organisms.
•Community: A variety of types of populations living together.
•Ecosystem: A specific environment with unique biotic and abiotic factors.
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(2) Population Characteristics•Populations are studied and monitored by 3 characteristics:
•Geographic Distribution:The area/s inhabited by the population.•Density:Number of organisms per unit area within the population’s habitat.•Growth Rate:How fast the population increases or decreases in size over time.
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6 July 22, 2012 Footer text here
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7 July 22, 2012 Footer text here
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(3) Population Size•4 Factors affect the size of a population:•Number of births
•Number of deaths
•Number of organisms entering (immigrating).
•Number of organisms leaving (emigrating).
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(4) Population ChangesAnything that alters how the different organisms cycle energy and matter to one another, will cause changes to the
population.
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(5) Limiting Factors to Population Size•A Limiting Factor is something that stops a population from continuously growing larger.
•There are 2 Types:•Density Dependent Factors that directly relate to how many organisms there are.
•Density Independent Factors that have no relationship to the number of organisms there are.
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(6) Density Dependent Factors•Competition between organisms for resources.
•Predation (organisms being hunted).
•Parasitism (organisms invading other living structures and withdrawing all resources).
•Disease.
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(7) Density Independent Factors•Human Disturbances & Activities.
•Climate Change.
•Natural Disasters.
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(8) Carrying Capacity•The Carrying Capacity of a population is the largest number of individuals that a given environment can support.
•Limiting Factors determine the carrying capacity of any population.
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