Stocks fell further on Monday as investors fretted about the potential strength of an economic recovery, and falling commodity prices hit shares of energy and other natural resource companies.

Big-cap technology shares led the Nasdaq down, including Apple , which fell about 2 percent to $136.79. Apple said it had sold more than 1 million of its newest iPhone in the first three days of launch, beating expectations. But over the weekend, it was reported Chief Executive Steve Jobs had a liver transplant two months ago.

The Dow Jones industrial average <.DJI> fell 158.86 points, or 1.86 percent, to 8,380.87. The Standard & Poor's 500 Index <.SPX> lost 22.62 points, or 2.46 percent, to 898.61. The Nasdaq Composite Index <.IXIC> gave up 53.44 points, or 2.92 percent, at 1,774.04.

(Reporting by Leah Schnurr; Editing by Jan Paschal)