Ecology Flashcards
What does lambda equal
the survivors from time t + the new individuals divided by per original individual in time t
When does exponential growth happen
it happens when the population growth rate (the amount that the population grows by in this time unit) depends on the population size in this time unit
What are the exponential equations, and what does each part mean
Nt+1 = λ Nt
What can we conclude is λ>1
survivors+new indivauls > N so population will increase over time
Examples of mutualism
Protozoa inside termites provided the enzymes to breakdown cellulose in return for an environment to live in
Why do ants sometimes castrate their host plant
to direct energy away from reproduction and to vegetative growth so their are more rewards for the ants
How can plants protect themselves from explotation
Hosts have more access to benefits than general foragers e.g making sure that the extrafloral nectar is on biochemically available to muralists.
Also grow less efficently ad produce less cavities if the plant isnt protected from herbivores and lianas
What are 1st best responses
policies that remove distortion
What would be some 1st best policies for extinction
stop the habitat loss
eradicate invasive species or disease
stop the poaching
What are 2nd best responses, examples
countervailing policy e.g culling seals to save salmon, alternative nesting sites for macaws, controlled flooding for successional plants,
What are 3rd best responses and give examples
mitigating damage, hand pollinate and permanent captive breeding
Cons with management actions
costly, time consuming and risky
What is population viability analyses
A tool to help choose amongst different management tools Model the population of interest Change the parameters and see how population growth responds
