(Reuters) - * The Toronto Stock Exchange's S&P/TSX fell 47.31 points, or 0.29 percent, to 16,001.71.
* Lagging shares were Dollarama Inc , down 17.2 percent, Aphria Inc, down 16.9 percent, and Canopy Growth Corp, lower by 13.6 percent.
* Leading percentage gainers were ATS Automation Tooling Systems Inc , up 6.8 percent, Lucara Diamond Corp , up 6.4 percent, and Tourmaline Oil Corp , higher by 4.6 percent.
* On the TSX 97 issues advanced and 136 declined as a 0.7-to-1 ratio favored decliners. There were 6 new highs and 9 new lows, with total volume of 221.6 million shares.
* The most heavily traded shares by volume were Aurora Cannabis Inc , Aphria Inc and Canopy Growth Corp.
* The TSX's energy group fell 0.52 points, or 0.28 percent, while the financials sector climbed 0.18 points, or 0.06 percent.
* West Texas Intermediate crude futures fell 2.25 percent, or $1.57, to $68.79 a barrel. Brent crude fell 1.76 percent, or $1.4, to $78.34.
* The TSX is off 1.3 percent for the year.
(Reporting By Sinéad Carew)