1
Lecture 6: Jan. 15
Species Interactions:
Competition
• Community Ecology
• Ecological Niches &
Fitness
• Consequences of
Competition
- Competitive Exclusion
- Key Field Experiments
- Niche Differentiation
Discussion Activity
This Week
Population Ecology
Simulations
-read handout before you
come to discussion (week 3)
Check Qwizdom Points
on SAMS
https://cats.lsa.umich.edu/
Reading: Ch.
53
: 1214-1220
Errors in Textbook: page 1199 in Ch. 52
make sure you can do those problems...
In box 52.2, which gives details on using exponential
growth model, especially equation
52.7
, there are some
mistakes in the problems dealing with whooping crane
populations – refer to problems
#3
and
#4
.
My corrections follow:
In
#3
, the text provided is fine, but the ‘helpful’ guidelines
they give in telling you what N
0
and N
t
equal are incorrect
.
N
0
= 2 (1 breeding pair) and N
t
should be
50 (25
breeding pairs). You should also know that (lambda)=
λ
=
e
r
, so by taking natural log of both sides of equation you
can find
r
(they discuss this on page 1198)
. The correct answer
is t = 4.64 years.
In
#4
, N
0
should be
2 (1 breeding pair) and N
t
should
be
50 (25 breeding pairs). The answer of 2074 is correct
.
Ecologists ask questions at a variety of scales...
organismal
population
community
ecosystem
biosphere
A community is an assemblage of populations of
different species that are interacting and living
in a particular area.
What is a community?

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