maximum sustainable yield represents the maximum number of individuals an ecosystem can support.
maximum sustainable yield represents the maximum number of individuals an ecosystem can support.
which term represents the maximum number of individuals an ecosystem can support?
maximum sustainable yield
figure 3 shows how growth rate varies with population density. for low densities (far from carrying capacity), there is little addition (or "recruitment") to the population, simply because there are few organisms to give birth. at high densities, though, there is intense competition for resources, and growth rate is again low because the death rate is high. in between these two extremes, the population growth rate rises to a maximum value (formula_18). this maximum point represents the maximum number of individuals that can be added to a population by natural processes. if more individuals than this are removed from the population, the population is at risk for decline to extinction. the maximum number that can be harvested in a sustainable manner, called the maximum sustainable yield, is given by this maximum point.
maximum sustainable yield
here the first term represents the change in the perturbed distribution function, formula_16, with time. the second term represents particle streaming along the magnetic field line. the third term contains the effects of cross-field particle drifts, including the curvature drift, the grad-b drift, and the lowest order e-cross-b drift. the fourth term represents the nonlinear effect of the perturbed formula_17 drift interacting with the distribution function perturbation. the fifth term uses a collision operator to include the effects of collisions between particles. the sixth term represents the maxwell–boltzmann response to the perturbed electric potential. the last term includes temperature and density gradients of the background distribution function, which drive the perturbation. these gradients are only significant in the direction across flux surfaces, parameterized by formula_18, the magnetic flux.
gyrokinetics