please give answer in detail for 5 stars!! Consider the following figure represe
ID: 49441 • Letter: P
Question
please give answer in detail for 5 stars!!
Consider the following figure representing the theoretical relationships between patch area (size) and isolation (distance from one another) and the equilibrium proportion of occupied habitat patches in a metapopulation:
(a) The x- and y-axis labels on this graph should be what?
(b) What do the lines labeled A and B on the graph represent and how do the patches modeled by each differ, specifically? [HINT: think back to the Theory of Island Biogeography]
(c) What do the lines labeled C and D on the graph represent and how do the patches modeled by each differ, specifically? [HINT: think back to the Theory of Island Biogeography]
(d) What the equilibrium proportion of occupied patches predicted for a metapopulation with small patches located relatively close to one another?
Explanation / Answer
Metapopulation is a group of subpopulations of same species in a particular area, connected via migration. If any one subpopulation becomes extinct, then also the metapopulation persists. So, a metapopulation is not at all dependent on the extinction of any one species. Because if some subpopulations becomes extinct, then some new subpopulations are also formed from the existing populations. The given graph explains the effect of rate of extinction or re-colonisation on a metapopulation.
When a population migrates from one place to another, it will be able to survive in the new location only when it finds a suitable habitat. A patch refers to a suitable habitat surrounded by an unsuitable habitat.
(a) x axis shows "proportion of patches occupied" and y-axis shows "rate of extinction or colonisation".
(b) A and B represents colonisation rate. A represents near colonisation and B represents distant colonisation.
If there is greater distance between two populations, then colonisation rate will be affected. And it will be more difficult for the migrated population to find out unoccupied patches. So, the proportion of patches occupied will change. Metapopulation with large and close patches will have higher rate of patch occupancy in comparison to metapopulation with small large patches. If due to development, a patch size is reduced, the possibility of extinction of metapopulation will increase.
(c) C and D represents extinction rate. C represents small population extinction and D represent large population extinction.
explained in (b)
(d) If P represents the proportion of patches occupied; e represent probability of extinction and m represents probability of colonisation, then the equation will be :-
P = 1- (e/m) where m>e
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