  We examine how the existence of a population of primordial black holes (PBHs)
influences cosmological gravitational particle production (CGPP) for spin-0 and
spin-1 particles. In addition to the known effects of particle production and
entropy dilution resulting from PBH evaporation, we find that the generation of
dark matter (DM) through CGPP is profoundly influenced by a possible era of PBH
matter domination. This early matter dominated era results in an enhancement of
the particle spectrum from CGPP. Specifically, it amplifies the peak comoving
momentum $k_\star$ for spin-1 DM, while enhancing the plateau of the spectrum
for minimally coupled spin-0 particles for low comoving momenta. At the same
time, the large entropy dilution may partially or completely compensate for the
increase of the spectrum and strongly mitigates the DM abundance produced by
CGPP. Our results show that, in the computation of the final abundance, CGPP
and PBH evaporation cannot be disentangled, but the parameters of both sectors
must be considered together to obtain the final result. Furthermore, we explore
the potential formation of PBHs from density fluctuations arising from CGPP and
the associated challenges in such a scenario.
