The Davey-Stewartson system is shown to appear when finite-rank constr
aints are imposed over the right-derivatives of certain automorphisms
solving the heat equation. Families of solutions encompassing Wronskia
n and Zakharov-Shabat-Nakamura type solutions are found for the Davey-
Stewartson system and the reduction to the Davey-Stewartson I is discu
ssed.