Bifurcation curves of a diffusive logistic equation with harvesting   orthogonal to the first eigenfunction
  We study the global bifurcation curves of a diffusive logistic equation, when harvesting is orthogonal to the first eigenfunction of the Laplacian, for values of the linear growth up to $\lambda_2+\delta$, examining in detail their behavior as the linear growth rate crosses the first two eigenvalues. We observe some new behavior with regard to earlier works concerning this equation. Namely, the bifurcation curves suffer a transformation at $\lambda_1$, they are compact above $\lambda_1$, there are precisely two families of degenerate solutions with Morse index equal to zero, and the whole set of solutions below $\lambda_2$ is not a two dimensional manifold. 
Pedro M. Gir\~ao and Mayte P\'erez-Llanos
math.AP