Scrum-half Ricky Januarie, who spent three months with Welsh region the Ospreys this season, also starts.
The Ospreys produced some pressure after the break but the Munster defence held firm.
The Ospreys acknowledged the "intense" competition at number nine as a factor in Marshall's departure.
Bowe's injury was assessed by both the Ospreys and Ireland medical teams and specialist consultants.
His colourful career took him to Swansea, the Ospreys, Bristol, Harlequins, the Scarlets and Pau.
The Ospreys clinched their crown by beating Leinster 17-12 in last season's Grand Final in Dublin.
But the Ospreys proved up to the challenge as they held out to claim victory.
The Wales wing concedes that the Ospreys "under-achieved" last season despite winning the EDF Energy Cup.
The Ospreys are desperate to conquer Europe and boast a squad of international stars.
He will be available for the Ospreys' home Celtic League game with Borders next Friday.
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Adam Jones, Ian Evans and Lee Byrne have all recently returned to action for the Ospreys.
The Ospreys are exploring their back-row options after promoting former All Black Filo Tiatia to player-coach.
Between them the Blues and the Ospreys shouldered the geographical responsibilities left by the Warriors' demise.
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Hook and Boyet swapped penalties again as the Ospreys led 22-12 after 64 minutes.
But the night was over for the Ospreys when Paterson banged over his fifth penalty.
There is no such uncertainty at St Helen's where the Ospreys play for the last time.
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Collins is the Ospreys' first major signing since Scott Johnson's appointment as coaching boss.
But the Ospreys already have James Hook, Gareth Owen and Dan Biggar in that position.
The fly-half made no mistake this time, as Connor opened the Ospreys' scoring account.
Williams was also part of the Ospreys side who lifted the EDF Energy Cup last season.
The 24-year-old Mitchell is set to quit the Ospreys at the end of the season.
But the Ospreys claimed a losing bonus point after James Hook converted Nikki Walker's last-minute try.
Gloucester visit the Liberty Stadium next week and the Ospreys travel to Bourgoin in a fortnight.
Falatau then tested the Ospreys' defence charging towards the line before being forced into touch on the left-hand side.
"I think what the Dragons did, they showed exactly how to beat the Ospreys, " said Easterby.
After Warwick's third penalty, the Ospreys forced a last-gasp chance but Shane Williams' drop goal flew wide.
The Ospreys still had time to produce more pressure but Shane Williams' drop goal flew inches wide.
Peter Hewat converted and went on to add another three points after the Ospreys were caught offside.
It was a great game against the Ospreys and I believe we should have won against Munster.
The Ospreys, with the majority of their squad on international duty, looked well short of their best.
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