EE35

Question 1

What is the logistic model of population growing to carrying capacity?

Answer 1

dN/dt = rN(1-N/K)
r = intrinsic rate of increase
max rate population growth = N=k/2= rK/4
keep population at k/3 can harvest  rk/2 individuals per year
> r(k/2)(1-k/2/k)
= r.k/2(1-1/2)
=rk/4

Question 2

what is habitat loss driven by?

Answer 2

expansion of human population and economy

Question 3

what is an example of a dangerous introduced species?

Answer 3

harlequins and ladybirds

Question 4

what were the first threats of make a big difference to species?

Answer 4

overexploitation and introduced species
habitat loss - dominant story
climate change = up and coming

Question 5

what is an example of the chain of extinction?

Answer 5

artic fox introduced to aleutian islands
natural experiments
sea lion poulation crashed
killer whales began eating sea otters
kelp forests dissapeared as less sea otters to eat sea urchins that eat kelp.

Question 6

what is the tragedy of the commons?

Answer 6

theory by garret handin
individuals acting independently and irrationally according to self interest behave contrary to the best interests of whole group by depleting common resource.