  In the Generalized Noah's Ark Problem, one is given a phylogenetic tree on a
set of species $X$ and a set of conservation projects for each species. Each
project comes with a cost and raises the survival probability of the
corresponding species. The aim is to select for each species a conservation
project such that the total cost of the selected projects does not exceed some
given threshold and the expected phylogenetic diversity is as large as
possible. We study Generalized Noah's Ark Problem and some of its special cases
with respect to several parameters related to the input structure such as the
number of different costs, the number of different survival probabilities, or
the number of species, $|X|$.
