Radiotracer:

x1'[t]==-1.25 x1[t]+0.69 x2[t]

x2'[t]==1.06 x1[t]-0.72 x2[t]

x3'[t]==0.19 x1[t]+0.03 x2[t]-2.5 x3[t]

x4'[t]==2.5 x3[t]

Small Mammal Dispersion (without trapping):

x’= x*(1-x)-0.937*(x-y)

y’= 0.9*y*(1-y)+1.11*0.937*(x-y)