Since (x t)) and (y(t)) in system (2) represent population sizes at time t, they must be nonnegative, so, for further study, the first thing is to prove the solution of system (2) has a unique global positive solution.
A bubble diagram was applied to depict three-dimensional information [ 24] with bubble area representing population size.
Coalescent analyses assuming an exponential population growth/decline estimated that the population decline started 1000 - 10 000 years ago with the present population sizes representing 0.03-0.440.03-0.44%istorical sizes.
Thus, the nucleotide polymorphisms represent population variation.
Some maps may represent the physical area bounded by state boundaries, others may represent the population size, or the relative abundance/poverty of natural resources.
Using this scheme plots are allocated according to n h ~ N h S h, where h indexes strata, n h represents stratum sample size and N h and S h represent stratum population size and standard deviation of timber volume respectively (Cochran 1977).
The black and the grey lines, respectively, represent the population size and the amount of the sterile individuals in the case where p = 0.4 and q = 0.8, while the black dashed line and the grey dashed line, respectively, stand for the population size and the amount of sterile individuals in the case where p = 0.8 and q = 0.4.
The following famous population dynamics dX_{t} = X_{t} a-bX_{t}),dt is often used to model population growth of a single species, where (X_{t} a-bX_{t}nts its population size at time t,dta>0) is the rate oftenowth, and (b>0) represents the effect of intraspecies interaction.
The algorithm has as input values α that represents the population size, N maximum number of generations and k fitness scaling factor.
