Small-cap stocks posted a solid rally Tuesday, bolstered by sinking crude oil prices, a strong dollar and enthusiasm over a steady spate of merger and acquisition activity. The Russell 2000 (NYSE:IWM) rose 19.19, or 2.75%, to 716.82, marking the 9th-largest one-day gain of the year.

The recovery bounce in stocks from a morning slide was clearly paced by small caps as the Russell 2000 moved into the green well ahead of its large-cap brethren — and even well before the crude oil collapse gained momentum.

“Crude was helpful to sectors in the market, but today’s action was also dominated by a wave of earnings. The lack of material downside follow through in the financial sector post Wachovia, Keycorp and American Express sparked a bid. The market was able to shrug off the initial bearish news with surprisingly little downside, which is a big positive. In addition, M&A activity is perking up,” said Nick Kalivas, vice president, financial research with MF Global.

Kalivas said that the deal by Brocade Communications Systems (Nasdaq:BRCD) to purchase Foundry Networks Inc. (Nasdaq:FDRY) helped secure a positive tone for the market, particularly in small caps. FDRY gapped higher on huge volume today, and added some 30% to its market cap on the news.

Several airline stocks are in the small- to mid-cap range, and those stocks really took flight today as crude oil tanked. The AMEX Airline Index shot 22% higher today, and small-cap carrier US Airways (NYSE:LCC) jumped a whopping 59% despite reporting huge — but not surprising — quarterly losses. Small-cap firm Alaska Air Group Inc. (NYSE:ALK) was up 19%, while JetBlue Airways Corp. (Nasdaq:JBLU) rallied 20% and UAL Corp. (Nasdaq:UAUA) gained some 63%.

As for crude oil, the market for black gold went into a tailspin, sinking some 3% to 6-week lows. Clearly, the rise in the U.S. dollar went hand-in-hand with the plunge in crude, but one could argue that the dollar rally also played in a role in pulling down commodity prices across many markets. For instance, corn was down 3%, sugar down 3%, orange juice down 2.7% and even gold reversed overnight gains to . . .

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