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Lecture

lecture note

2 Pages
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Department
Biology
Course Code
BIO120H1
Professor
Ingrid L.Stefanovic

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L04- BIO 120
New Section: Population Ecology
now, we will discuss populations: collection of individuals of the same
species in the same are (N)
what influences 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.
Slide 6:
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:
density-independent: those that are growing unrestrained
S7- structure of typical population growth model
most important: N and t ( changes with time)
Nt : N at a specific time t
Nt+1: N in the future
Nt+1=f(Nt) [f-function]
S8- for modeling continuous pop. Growth, use calculus.
S10- pop. change from Nt to Nt+1 Nt+1=Nt-D(died)+b(born)-E(emigrate)
+I(immigrate)
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Description
L04- BIO 120 New Section: Population Ecology now, we will discuss populations: collection of individuals of the same species in the same are (N) what influences 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 lo
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