TORONTO (Bloomberg) — Canadian stocks declined for a second day, led by commodity producers including Talisman Energy Inc. and Teck Cominco Ltd., as oil, copper and gold prices slid.Energy companies and raw-material producers account for more than two-fifths of the Standard & Poor’s/TSX Composite Index’s value and led the gauge’s climb to a record in April.

“Oil’s down, copper and the base metals are down, gold’s down a little,” said Bruce Hartman, who helps manage about $790 million at Rockwater Asset Management in Toronto. “There just isn’t much of anything supporting stocks on the upside today.”

The S&P/TSX fell 31.07, or 0.3 percent, to 12,309.40 in Toronto.

A measure of energy companies retreated 1.1 percent and was the biggest drag on the S&P/TSX.

Crude oil for December delivery fell 1.7 percent to $58.58 a barrel in New York, as warm weather in the eastern U.S. reduced heating-fuel consumption by homeowners and businesses.

Talisman Energy, an oil and natural-gas producer that’s expanding in the North Sea, slipped 29 cents to C$18.27. Canadian Natural Resources Ltd., Canada’s second-largest natural-gas company, slid 61 cents to C$57.29.

Canadian Oil Sands Trust dropped C$1.23 to C$28.42 and Penn West Energy Trust retreated 53 cents to C$32.73. ARC Energy Trust was 99 cents lower at C$20.11.

An index of trusts, more than half of which are energy- related, was down 2.4 percent. It’s 17 percent lower than on Oct. 31, when the Canadian government announced that it will close in 2011 a loophole that allows the trusts to avoid most taxes.

A gauge of raw-material stocks lost 0.2 percent.

Copper for delivery in three months in London lost 0.4 percent to $3.075 a pound in New York, extending a three-week slump, as inventories climbed to the highest since April 2004, easing supply concerns.

Gold for December delivery closed 0.7 percent lower at $625.80 an ounce in New York.

Teck Cominco, a miner of zinc and copper, slipped C$3.07 to C$82.02.

HudBay Minerals Inc., a zinc producer whose shares have more than tripled this year, declined 82 cents to C$18.54. Inmet Mining Corp., a copper and gold exploration company, plunged C$2.90, or 5.2 percent, to C$53.10.

Iamgold Corp., which last week completed its $1 billion takeover of smaller rival Cambior Inc., fell 30 cents to C$10.54.

Research In Motion

The market’s losses were limited by gains in computer- related shares, which rallied 2.8 percent as a group.

They followed US technology stocks higher after Citigroup Investment Research’s chief U.S. equity strategist Tobias Levkovich advised investors to buy more semiconductor shares, saying in a note that broker downgrades and rising short interest have created a buying opportunity.

Research In Motion Ltd., maker of the BlackBerry e-mail phones, climbed C$5.50, or 3.9 percent, to C$146.11.

Cognos Inc., Canada’s biggest publicly traded software maker, advanced C$1.19 to C$44.92.

The following shares had unusual price changes. Stock symbols are in parentheses.

Centurion Energy International Inc. rose 89 cents, or 8 percent, to C$11.97. Dana Gas PJSC, a United Arab Emirates- based energy company, agreed to buy Calgary, Alberta-based Centurion Energy for C$1.15 billion.