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Collective interactions in the preequilibrium quark matter and hadronicresonance gas stage of ultrarelativistic nucleus-nucleus collisions are studiedin the framework of the the transport theoretical approach RQMD. The paperreviews string fusion into color ropes and hadronic rescattering which serve asmodels for these interactions. Hadron production in central Pb(160AGeV) on Pbcollisions has been calculated. The changes of the final flavor composition aremore pronounced than in previous RQMD studies of light ion induced reactions at200AGeV. The ratio of created quark pairs $s\bar{s}$/($u\bar{u}$+$d\bar{d}$) isenhanced by a factor of 2.4 in comparison to $pp$ results. Color rope formationincreases the initially produced antibaryons to 3 times the value in the `NNmode', but only one quarter of the produced antibaryons survives because ofsubsequent strong absorption. The differences in the final particle compositionfor Pb on Pb collisions compared to S induced reactions are attributed to thehadronic resonance gas stage which is baryon-richer and lasts longer.Comment: 60 pages + 11 postscript figures (uuencoded and included

Flavor production in Pb(160AGeV) on Pb collisions: Effect of color ropes and hadronic rescattering