* M&A supports global stocks, techs weigh on Wall Street
* Oil erases early gains, drops $1 as dollar gains
* Treasuries fall on profit taking, euro weakens further
(Updates with European markets close)
By Walter Brandimarte
NEW YORK, Aug 23 (Reuters) - A slew of corporate takeover activity helped global stocks recover from a one-month low on Monday, but oil prices fell about 1 percent as the dollar strengthened against major currencies.
Despite the improved market sentiment, which also encouraged some selling of safe-haven U.S. Treasury debt, stocks trimmed gains later as technology shares plummeted on Wall Street.
The euro weakened further, hurt by persistent concerns over the euro zone economy.
The recovery in stocks markets was prompted by news of several merger and acquisition deals, considered a sign that companies are making use of high cash balances and historically low borrowing costs to look for bargains and expand their business.
"The whole market is geared to M&A activity," said David Buik, senior partner at BCG Partners. "We're of the opinion that the quality of economic data across the world is poor, but on the other side of the coin there is enough M&A activity out there to limit any kind of a fall in the immediate future."
Among the deals, Campbell Soup Co <CPB.N> may make a $2.3 billion break-up bid for Britain's United Biscuits, owned by private equity firms PAI Partners and Blackstone Group LP <BX.N>, the London-based Sunday Times reported. For details, see [
].HSBC is also in talks to buy a stake in South Africa's Nedbank in a potential $6.8 billion deal. In Asia, an estimated $58 billion worth of M&A was playing out Monday.
Hewlett-Packard Co <HPQ.N> offered $24 a share in cash for data storage company 3PAR Inc<PAR.N>. The $1.6 billion offer tops a competing bid by technology rival Dell Inc <DELL.O> and fears of a bidding war weighed on HP's shares, dragging tech stocks down. [
].The three main U.S. stock indexes rose nearly 1 percent after the market opened but trimmed gains later, with the Nasdaq turning negative.
At around noon in New York, the Dow Jones industrial average <
> was up 6.32 points, or 0.06 percent, at 10,219.94, while the Standard & Poor's 500 Index <.SPX> gained 1.27 points, or 0.12 percent, to 1,072.96. The Nasdaq Composite Index < > dropped 8.67 points, or 0.40 percent, to 2,171.09.The MSCI All-Country World equity index <.MIWD00000PUS> rose 0.19 percent while the FTSEurofirst 300 index <
> of top European shares closed up 0.67 percent, following three consecutive session of losses.Mining shares gained as financial markets bet Australia's inconclusive weekend elections would lead to a change of government, spelling the end to a plan to impose tax on major iron ore and coal mines.
The STOXX Europe basic resources index <.SXPP> rose 2.96 percent, while BHP Billiton <BLT.L>, Anglo American <AAL.L>, Antofagasta <ANTO.L> and Rio Tinto <RIO.L> gained 0.6 percent to 1.6 percent.
U.S. crude oil prices <CLc1> fell 75 cents, or 1.02 percent, to $73.07 per barrel, as a stronger dollar made it more expensive for investors using other currencies to buy the commodity.
EURO WEAKENS
The dollar rose 0.1 percent against a basket of major currencies measured by the U.S. Dollar Index <.DXY>.
The euro continued its slide, down 0.15 percent to $1.2686, as it was hurt by concerns about the euro zone economy and prospects of loose monetary policy for an extended period.
The number of investors betting against the euro has increased, data from the Commodity Futures Trading Commission showed. [
]Data from UBS AG also showed a drop in net investment flows into the euro zone for a third consecutive week.
"August's deceleration in activity (in Europe) has dented some of the euro bulls' arguments about economic outperformance vis-a-vis the United States and as such put a cap on any euro rally for now," said Boris Schlossberg, director for currency research at GFT in New York.
The Australian dollar reversed losses after being dented by political uncertainty from an inconclusive general election.
The currency fell earlier after neither major party in Australia won an overall majority in Saturday's election. [
]The Aussie dollar traded as low as $0.8864 <AUD=> but it recouped losses to trade at $0.8929, helped by buying from real-money accounts.
U.S. Treasuries prices gave back part of a recent rally. The 30-year U.S. Treasury bond <US30YT=RR> was down 12/32 in price, with the yield at 3.6829 percent, as investors took profits and made room for this week's $109 billion sale of bond auctions. (Additional reporting by Leah Schnurr, Burton Frierson and Vivianne Rodrigues; Editing by Andrew Hay and Paul Simao)