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Bell Ringer!Do the quick write on the bottom of page 14 (Biomes page). Intestines!Also, add that your independent variables also included the heterotrophs & autotrophs for the Eco-Zones!
Nitrogen and Carbon Cycles Page 9
Cycling of Nutrients:Carbon Cycle
Cycling of Nutrients:Nitrogen Cycle
Population GrowthPage 17
How fast do populations grow?Starts slow…increases fastExponential growth = “J curve”
Population GrowthWill populations keep increasing?
No! something always runs out
Called “limiting factors”Limiting Factors- resources that limit the growth, abundance, or distribution of an organism or population of organisms in an ecosystem
Can you think of any examples?
Population GrowthTwo types of limiting factors:
Density dependent
More affected when population is largerExamples: food, water, shelter
Density independent
Does NOT matter how many are in the populationExamples: flood, tornado, etc
Population GrowthSo, how many can live in a habitat?
Carrying capacity
# of organisms environment can supportIf population goes above the CC, death rate will increase
Population Growth
Variations in Population Growth
Populations of organisms have highly variable patterns of growth
What does this data indicate
about the growth
pattern of each
population?
Growth StrategiesPopulation growth is controlled by two things:
~ Carrying capacity of environment (K)
~ Rate of reproduction (r)
r Selection:reproduction rate is more important
These organisms…Have a high growth rateTend to be in disturbed habitatsHave “Type III” curve…early lossesRapid development…short lives
K Selection:hovers near carrying capacity
These organisms…Have fewer offspringTend to be in stable habitatsHave “Type I or II” curve…constant or late lossSlower development… longer lives
r and K Strategies
Age Structures & MortalityPopulation growth is influenced by age structure within a population
Higher #s in the “reproductive ages” means more growth
Which population is growing the
fastest?
The slowest?
How do you know?
Page 12- ReflectionsWrite 5-7 sentences reflecting on what SYMBIOSIS meant to you
Write 5-7 sentences reflecting on what POPULATION GROWTH meant to you