  It was recently discovered that the quantum correlations of a pair of
disentangled qubits, as measured by the quantum discord, can increase solely
because of their interaction with a local dissipative bath. Here, we show that
a similar phenomenon can occur in continuous-variable bipartite systems. To
this aim, we consider a class of two-mode squeezed thermal states and study the
behavior of Gaussian quantum discord under various local Markovian non-unitary
channels. While these in general cause a monotonic drop of quantum
correlations, an initial rise can take place with a thermal-noise channel.
