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ecology
23 cards·by karla
What is IFD
Ideal free distribution
Under IFD, what are two habitats differing in abundance of resources
rich habit and poor habitat
according to IFD, each individual should choose a habitat to...
maximize its payoff
according to IFD, with no competitors...
go to rich habitat
according to IFD, No territoriality, so theoretically no limit to...
number of individuals in each habitat
according to IFD, more competitors means...
fewer resources
according to IFD, the best strategy will be to occupy the ...
the poor habitat
IFD prediction 1
All competitors experience equal per capita benefits
IFD prediction 2
Average gain rates are equal in all patches
IFD prediction 3
number of individuals in a patch should be directly proportional to resource input rate
(input matching rule)
IFD example...
Sticklebacks, 6 fish, prey dropped into each end of tank, prey dropped twice as fast at one end
outcome of IFD example (stickleback)
fish distributed according to patch profitability: 4 at rich end, 2 at poor end
subpopulations
large population divided into smaller groups that inhabit isolated patches
metapopulation
individuals frequently disperse among subpopulations
(metapopulation) if dispersal is infrequent, each subpopulation fluctuates
independently
basic metapopulation model
patches of suitable habitat embedded within a matrix of unsuitable habitat
(basic metapopulation model) all suitable patches are assumed to be of
equal quality
source sink metapopulation model
extends upon the basic metapopulation model, not all patches of habitat are of equal quality
sources
high quality habitats, source of dispersers
sinks
low quality habitats
sinks reproduction is less than..
mortality
sinks need influx of incoming dispersers to maintain
subpopulation
landscape metapopulation model
model that considers both differences in the quality of the suitable patches and quality of
the surrounding matrix