By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Portuguese stocks slumped in an otherwise upbeat Europe on Monday, after the country's high court struck down some of the austerity measures enacted as part of its 78 billion euro ($101.5 billion) bailout.

Most other European stock markets gained ground, rebounding after the biggest weekly selloff since November in the wake of Friday's weak U.S. employment data.

The Stoxx Europe 600 index gained 0.2% to close at 287.64, after posting the biggest daily loss since October on Friday.

"We're seeing a bit of a bounce back. You had the U.S. markets close fairly solid [on Friday] compared to the losses in Europe and with the huge gains you saw today on the Nikkei there's a bit of a recovery," said Richard Perry, chief market strategist at Central Markets in London.

But even with last week's dire data shaving off a good portion of the European indexes, Perry was reluctant to use this as a buy-in opportunity.

"Until the middle of last week I had been happy to buy into a correction. But the U.S. data out last week [were] pretty bad. It does open the eyes to potentially the U.S. recovery is not as strong as you thought it would be," he added.

Portugal stocks drop

Portugal's PSI 20 index lost 1.4% to 5,558.37. The European Commission on Sunday warned that if the nation fails to implement its austerity program it could put future financial aid at risk. The statement came after the country's high court ruled against some of the austerity measures affecting public employees, creating a large hole in the 2013 fiscal budget.

Analysts at Barclays said in a note that the court's decision "comes at a particularly delicate time as Portugal was expecting this week a favorable decision by its European peers (at the Eurogroup/Ecofin meetings) on lengthening the maturity of the program loans."

A move toward longer loan maturity would ease Portugal's return "to the markets, which the government and troika had hoped for by the end of this year," the analysts said.

Shares of Banco Comercial Português SA lost 3.5% and Banco Espirito Santo SA dropped 3.4%.

In Greece, shares of National Bank of Greece SA sank 10% and Eurobank Ergasias SA rose 20%, after a planned merger between the two banks was halted by the government over the weekend. The unexpected move comes amid fears that the merged lender would become too big to be bailed out by the government.

The ATHEX Composite rose 0.7% to 829.08.

Other movers

Among other notable movers, shares of Spirent Communications PLC sank 4.7%, after UBS cut the firm to neutral from buy, worried that the recovery is taking longer than anticipated.

Shares of Barry Callebaut AG, , the world's largest chocolate maker by volume, dropped 3.3%, after first-half profit came in below market expectations with a 7% decline.

The broader European stock markets, however, moved higher, partly recovering from a sharp selloff last Friday, triggered by U.S. nonfarm-payrolls data coming in well below estimates. The data followed other disappointing releases last week, including initial jobless claims and the ISM services index

U.S. stocks traded lower on Wall Street. Investors were cautiously waiting for earnings from bellwether Alcoa Inc. (AA) to unofficially kick off the first-quarter earnings season.

"Consumers had to deal with the expiration of the Bush tax cuts and this earnings season could really tell us the effect of that," said Perry from Central Markets.

The U.K.'s FTSE 100 index added 0.4% to 6,276.94. Shares of Polymetal International PLC added 5.3%, after the gold and silver miner said 2012 full-year profit jumped 38% on the back of higher sales and bringing new production sites on line.

In other news in Britain, former Prime Minister Margaret Thatcher died Monday morning after stroke at the age of 87. Thatcher was the first British female prime minister and the longest serving in more than 150 years. Read: Twitter mourns Margaret Thatcher's death--an Iron Lady to be remembered

France's CAC 40 index gained 0.1% to 3,666.78. Shares of Technip SA put on 2.7%, after the oil-services firm said it was awarded a major subsea project in Congo. Read: 13 French stock picks that avoid France's economic trouble: JPM

In Germany, the DAX 30 index rose 0.1% to 7,662.64. Read: Germany's account surplus jumps; no one is happy

Shares of drug maker Bayer AG picked up 2.6%, after the firm said its riociguat drug for treating pulmonary hypertension has been granted priority review by the U.S. Food and Drug Administration.

Shares of Lanxess AG lost 2.3%, as Nomura cut the chemicals firm to neutral from buy.

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