The distributions of both the organismal and ecological diversity of Peru w
ere evaluated through cartographic analyses in relationship to Peru's natio
nal system of protected areas. Also identified and mapped were areas so poo
rly known that they represent conservation information gaps, areas that can
not currently be evaluated, but which should not be overlooked. These metho
ds revealed that the protected area system in Peru did not adequately prote
ct either organismal or ecological diversity. In the short term, inclusion
of unprotected priority areas in the national system is the best way to imp
rove biological conservation. Over long time periods, it is also important
to make decisions about the priority of areas that are information gaps. Th
is study provides a useful point of comparison with other countries that ar
e at different stages in the task of assembling biodiversity information. I
t was clear that i) the identified priority areas were important for nation
al-level planning; ii) the drier and nonforested ecosystems seldom have bee
n included in conservation efforts; iii) because degradation processes will
constantly change, the conservation status of a particular area will also
change and should not be confounded in the setting of priorities with the v
alue of the biological diversity present; and iv) the identification of inf
ormation gaps is the most transparent method for keeping decision-makers ad
vised as to the limits of scientific knowledge on the distribution of biolo
gical diversity.