  In this paper, we study the energy decay for the thermoelastic Bresse system
in the whole line with two different dissipative mechanism, given by heat
conduction (Types I and III). We prove that the decay rate of the solutions are
very slow. More precisely, we show that the solutions decay with the rate of
$(1+t)^{-\frac{1}{8}}$ in the $L^2$-norm, whenever the initial data belongs to
$L^1(R) \cap H^{s}(R)$ for a suitable $s$. The wave speeds of propagation have
influence on the decay rate with respect to the regularity of the initial data.
This phenomenon is known as \textit{regularity-loss}. The main tool used to
prove our results is the energy method in the Fourier space.
