A supermanifold P^{3|4} is a target space for twistor string theory. In this
note we identify a line bundle of holomorphic volume elements BerM_gP^{3|4}
defined on the moduli space of curves of genus g in P^{3|4} with a pullback of
a line bundle defined on M_g(pt). We also give some generalizations of this
fact.Comment: 9 pages, few typos were correcte
