# lecture note

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L04- BIO 120
New Section: Population Ecology
înow, we will discuss populations: collection of individuals of the same
species in the same are (N)
îwhat influences N?
îunlike humans, some plants have unusual reproduction ( see larkspur
and aspen on slides)
îlarkspur- normal, one seed produces many identical plants
îaspen- many unique seeds that produce many unique plants
îdandelions- no sex, identical seeds as mother, produces many identical
flowers.
îStrangler fig- starts as an epiphyte[canopy], bring down roots to the
ground, and once they are big enough and many, the roots start to
come together, and look more like a tree.
Slide 6:
Continuous growth â such as humans, babies are born throughout the
year
Discrete growth- birds for instance have babies at specific times in a year
îtwo models: density-dependant:
îdensity-independent: those that are growing unrestrained
S7- structure of typical population growth model
îmost important: N and t ( changes with time)
îNt : N at a specific time t
îNt+1: N in the future
îNt+1=f(Nt) [f-function]
S8- for modeling continuous pop. Growth, use calculus.
S10- pop. change from Nt to Nt+1î Nt+1=Nt-D(died)+b(born)-E(emigrate)
+I(immigrate)
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## Document Summary

now, we will discuss populations: collection of individuals of the same species in the same are (n) unlike humans, some plants have unusual reproduction ( see larkspur and aspen on slides) larkspur- normal, one seed produces many identical plants. aspen- many unique seeds that produce many unique plants. dandelions- no sex, identical seeds as mother, produces many identical flowers. strangler fig- starts as an epiphyte[canopy], bring down roots to the ground, and once they are big enough and many, the roots start to come together, and look more like a tree. Continuous growth such as humans, babies are born throughout the year. Discrete growth- birds for instance have babies at specific times in a year two models: density-dependant: most important: n and t ( changes with time) nt : n at a specific time t. S10- pop. change from nt to nt+1 nt+1=nt-d(died)+b(born)-e(emigrate)

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