Abstract
Motivated by a question of M. J. Bertin, we obtain parametrizations of minimal polynomials of quartic Salem numbers, say alpha, which are Mahler measures of non-reciprocal 2-Pisot numbers. This allows us to determine all such numbers alpha with a given trace, and to deduce that for any natural number t (resp. t >= 2) there is a quartic Salem number of trace t which is (resp. which is not) a Mahler measure of a non-reciprocal 2-Pisot number.