By Pratima Desai LONDON (Reuters) - Copper rallied to a one-week high on Wednesday as the dollar slipped and investors returned to commodity markets, but doubts about short-term fundamentals are expected to cap prices. Benchmark copper on the London Metal Exchange was trading at $8,926 a tonne at 0944 GMT from $8,799 at the close on Tuesday. The metal used in power and construction earlier touched $8,955 a tonne, its highest since May 11. Behind higher prices of base metals is the weaker U.S. currency, which makes commodities priced in dollars cheaper for holders of other currencies. "We've got a slightly weaker dollar in the last couple of days, it's supportive," said Daniel Major, analyst at RBS. "There is a slightly more risk positive tone and prices are stronger across commodities and equities." A stronger dollar and renewed concerns about global economic growth were behind crashing commodity prices in the first two weeks of May. Last week copper fell to $8,504 a tonne, its lowest since December last year. "Investors are feeling their way back slowly, there's a general feeling the sell-off was overdone," a metal trader said. "But I don't think we've seen an end to losses. Dollar strength and some bad economic news from China or the United States is all it will take." Continued...

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