The uncertainty caused by the debt crisis and weak global economy has affected mergers and acquisitions, whose volumes decreased by 24 percent in the first quarter of this year compared with the final quarter of 2011 and were down 26 percent year-on-year, a report showed on Monday.

The Ernst & Young M&A Tracker showed that globally, deal values were down 13 percent from the last quarter of 2011. The relatively smaller fall in value compared to deal volume reflects the increase in average transaction value quarter-on-quarter, Ernst & Young said in a statement.