* FTSEurofirst 300 index down 0.8 percent
* Commodities hit by China concerns; Alcoa
* Tesco gains after trading beats expectations
By Joanne Frearson
LONDON, Jan 12 (Reuters) - European shares were lower in early trade on Tuesday, with commodities weighing after China's central bank signalled it was tightening short-term liquidity, and results from U.S. Alcoa <AA.N> disappointed.
By 0933 GMT, the pan-European FTSEurofirst 300 <
> index of top shares was down 0.8 percent at 1,055.72 points.The index gained nearly 26 percent in 2009 and has risen around 65 percent since reaching its lifetime low last March.
China's central bank signalled in its open market operations it was tightening monetary conditions at a faster than expected pace in response to growing concern about the economy overheating. [
]"Markets have down well so to see a bit of a wobble should not come as a surprise. But, I think the recent developments in China could be quite critical," said Mike Lenhoff, strategist at Brewin Dolphin.
"If China is trying to take the steam out of lending growth, this, in turn, might slow developments in the economy and cause the market to react."
Energy stocks featured among the worst performers as crude <CLc1> slipped 0.8 percent. BP <BP.L>, Cairn Energy <CNE.L>, Royal Dutch Shell <RDSa.L> and Total <TOTF.PA> were down 0.7-1.6 percent.
Miners also fell back, as metal prices retreated and weak results from U.S. Alcoa <AA.N> knocked investor sentiment.
Antofagasta <ANTO.L>, BHP Billiton <BLT.L>, Eurasian Natural Resources Corporation <ENRC.L>, Rio Tinto <RIO.L> and Xstrata <XTA.L> were down 1.1-2.1 percent.
TESCO SHINES
On the upside, food retailers were in demand. Tesco <TSCO.L> gained 2.4 percent after beating Christmas sales growth forecasts in its main British market, boosted by its loyalty scheme and demand for premium foods, adding to signs of healthy festive spending. [
]"On the plus side, Tesco had excellent results," said David Buik, partner at BGC Partners. "I do believe the only sector worth supporting in the retail is the supermarkets."
Banks were under pressure following reports in the New York Times that President Obama was considering levying a tax on the sector.
UBS <UBSN.VX>, Deutsche Bank <DBKGn.DE> and Barclays <BARC.L> were down 1.2-1.6 percent.
Across Europe, the FTSE 100 <
> index was down 0.4 percent, Germany's DAX < > fell 0.7 percent and France's CAC 40 < > was 0.5 percent lower. (Editing by Dan Lalor)