Ten-man Town were defeated by a first half effort by former Robin Sean O'Hanlon on a disappointing afternoon at The County Ground.
Despite a bright start to the match, Paul Hart's were never really at their best and deserved little from what was a disjointed and tempestuous clash at The County Ground.
In spite of Town's strong start, it was the visitors who fashioned the first attempt at goal, as Daniel Powell found space on the edge of the box and let fly, but Phil Smith parried his shot and gathered it at the second attempt with Jabo Ibehre ready to pounce.
After struggling to settle early on, the Dons soon found themselves on top and it came as little surprise when they took the lead after 17 minutes through former Town defender Sean O'Hanlon.
The impressive Powell floated a corner to the back post, and when Smith failed to muscle his way through a densely populated six-yard box, O'Hanlon was left with the fairly simple task of nodding the ball into the corner.
The Dons continued to look the better of the two sides as the match moved past the half hour mark with visiting 'keeper David Martin remaining largely untested.
It took until the 36th minute for Town to create an opportunity, and they were desperately close to levelling the scores as first Jonathan Douglas volleyed an Alan Sheehan corner into O'Hanlon, before Jon-Paul McGovern hit the rebound inches wide via a deflection.
McGovern was again involved as Town fashioned another chance, the winger combining well with Alassane N'Diaye before curling a shot wide from just inside the box.
The hosts had rallied well and were inches away from levelling the scores on the stroke of half-time as McGovern played in David Prutton who drilled the ball to the back post where Calvin Andrew was waiting, but the striker couldn't keep his close-range effort down and the ball crashed against the crossbar and clear of danger.
Town went into the break needing to start brightly if they were to get back into the game, and they did just that, with Matt Ritchie testing David Martin from an early volley which the 'keeper did well to fingertip clear of danger.
Tempers began to flare around the hour mark when first Ian McParland was sent to the stands for his part in a spat with Dons boss Karl Robinson, before Paul Caddis was booked after a brief tete a tete with Stephen Gleeson.
Town seemed to be making the best of the raise in temperature, forcing a succession of corners and looking more threatening offensively after the introduction of Elliot Benyon.
However, as the match wore on, the visitors were looking increasingly likely to hold on for the three points, and they might have made it two on 73 minutes had O'Hanlon been more clinical from another corner, but he headed well over when well placed.
Town continued to strive and went close after 78 minutes as Andrew flicked a long throw from substitute Michael Rose into the danger area, but Benyon could only head straight into the arms of David Martin when he might have done better.
The hosts were dealt a huge blow after 84 minutes when Andy Frampton was shown a second yellow card for wrestling Jabo Ibehre to the ground on the halfway line, and the match seemed effectively over as a contest.
Town forced consecutive corners late on, and despite a late Michael Rose free-kick flashing just over, it never looked like materialising and they were left to reflect on another winless afternoon at The County Ground.