lecture 7 Flashcards
what does a dunctional response decribe?
the relationship between the rate of feeding of an individual predator and the density of the prey item
what is the type 1 functional response?
as prey density increases the feeding rate increases linearly
what does the slope of the line represent?
the efficiency of our predator at capturing prey or the proportion of prey density consumed
how do you calculate the feeding rate?
attack rate x prey density
what type of organisms have a type 1 functional response?
organisms with no handling time like bottom feeders
what is the type 2 functional response?
the feeding rate will initially increase with prey density but will eventually reach a maximal feeding rate
why would the curve of a type 2 functional response level off?
if at higher prey density if the predator can’t handle the prey any faster
what organisms do we expect to have a type 2 functional response?
- any organism that requires time to handle prey/food resource
- food prep activities take time
what is the type 3 functional response?
at low prey density the feeding rate increases slowly, at medium prey density the feeding rate gets faster, at high prey density the feeding rate slows and reaches a plateau
why is the type 3 response feeding rate lower than type 2 at low prey densities?
- spatial refuge
- predator learning/search
- prey switching
what organsisms are exoected to have a type 3 response?
same as type 2 but where either spatial refuge, predator learning, or prey switching occurs
what does ideal free distribution state?
- the number of individuals that will aggregate in various patches is proportional to the amount of resources in the patch
- therefore the payoff for an individual will be equal in all patches
- assumes that individuals can accurately judge the quality of different habitats and are free to move between patches
what does ideal free distribution describe?
how individuals will distribute themselves among patches
