5 Flashcards
r_max in logistics growth?
Per capita intrinsic rate of increase under ideal conditions
r_obs in logistic growth.
Per capita intrinsic rate of increase under actual conitions
Population growth depends only on?
Birth and death rates.
Is it possible for birth rates to be density dependent and death rate to be density independent, and vice aversa?
Yes
At k, how is b and d related?
b = d, the intersection of b and d. Past this intersection, d > b and population size cannot exceed.
Recourses? 3•
•Features in environment that are in short supply
•Required for survival and reproduction
•Can be consumed to the point of depletion.
Why may a species be classified as either k-selected or r-selected?
•K: stable low death conditions that allow populations to reach and remain at K
•K: Overtime, populations evolve traits that make them better competitors and less susceptible to predation.
•R: unstable high death conditions prevent populations from reaching K
•Over time, populations evolve traits tat make them better at growing and spreading fast.
Why don’t populations increase indefinitely? 3•
•They run out of recourses they compete for
•Disturbances knock their size down before competition get too harsh
•other species consume their recourses.
Intraspecific competition?
Competition within the same specis
Interspecific competition?
Competition between different species
Competition reduces recourses available for?
Both species and abundance of both is reduced to some extent.
Effects of competition is often?
Unequal (one species is harmed more)
In some cases, competition can lead a species to?
Extinction.
Competitive exclusion principle?
Two species using a limiting recourse in the same way, they cannot coexist indefinitely (one species will always be harmed by the other).
Exploitation competition?
Reduces the access to a recourse by reducing the availability of that recourse (not directly interfering with the competitor)
