* TSX ends down 191.71 points, or 1.6 pct, at 11,588.36
* Index ends week down 0.3 percent
* Nine of 10 main sectors lower
* Canada, US jobs better than expected
* Fitch downgrades Spain, Italy credit (Updates to close)
By Claire Sibonney
TORONTO, Oct 7 (Reuters) - Toronto's main stock index ended sharply lower on Friday as surprisingly strong North American jobs data was overshadowed by downgrades of Spain and Italy's credit ratings.
The index's resource-heavy materials sector dropped a hefty 3 percent, energy shares slid 2 percent, and financials were 1.1 percent lower. Among the most heavily weighted decliners, fertilizer producer Potash Corp (POT.TO) dived 4.1 percent, oil company Canadian Natural Resources (CNQ.TO) fell 4 percent, and miner Barrick Gold (ABX.TO) was down 2.3 percent.
"It's a bit of weakness after a pretty strong move in the past few days," said Don Vialoux, technical analyst at JovInvestment Management.
He said the TSX marked an important low earlier in the week, followed by a two-day rally, which could point to a seasonal recovery in equity markets starting earlier this year.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE ended down 191.71 points, or 1.6 percent, at 11,588.36. Nine of its 10 sectors were lower, with telecoms rising 0.1 percent. The index was down 0.3 percent on the week.
Early in the session, the index hit its highest level in nearly two weeks as data showed U.S. employers hired more workers than expected in September and job gains for the previous two months were revised higher, easing recession fears. [ID:nOAT004877]
Canada created six times as many jobs than forecast in September, once again outshining the United States. [ID:nN1E796020]
"It's been a pretty profitable week and somewhere along the way we're going to give back a little bit," said Fred Ketchen, director of equity trading at ScotiaMcLeod.
The risk trade was not helped by the debt downgrades of euro zone members Spain and Italy by Fitch, which came before a European summit on Sunday that is aimed at shoring up the financial sector. [ID:nL5E7L714R]
Analysts said that overall market conditions, including the ongoing debt crisis in Greece, would likely keep Canadian stocks in check over the coming weeks. Investors will also closely watch a new round of U.S. quarterly earnings reports, which begins next week.
Earnings expectations have already been lowered, so if stocks respond on the upside, "it will be a clear indicator that we're entering a period of seasonal strength," Vialoux said.
($1=$1.04 Canadian) (Editing by Peter Galloway)