Nigeria's main opposition party said Thursday the country should expect a more accountable government after the ruling party, which had controlled the government since 1999, lost its majority in parliament.

Thirty-seven lawmakers elected as members of the People's Democratic Party (PDP) defected to the opposition All Progressives Congress (APC) on Wednesday, stripping the PDP of its majority in Nigeria's 360-seat lower house.

"I think there is a window of hope after 14 years," APC spokesman Lai Mohammed told AFP, a reference to the PDP's complete dominance of national politics since military rule ended in 1999.

"The PDP can no longer take the electorate for granted," Mohammed said. "We should have a more competitive, accountable democracy."

President Goodluck Jonathan's PDP has suffered a series of unprecedented political blows in recent months, including the defection of five powerful state governors last month.

After Wednesday's mass party-switch announced by the speaker of the house, the PDP was left with just 171 members.

But analysts said it was premature to celebrate a new era of accountability and questioned whether the APC is actually motivated to clean up a government regularly ranked as one of the world's most corrupt.

"There are no ideological differences between the two parties," said Debo Adeniran of the Coalition Against Corrupt Leaders.

The lawmakers defected because they were "disgruntled" with the PDP and were resorting to "antics" to settle personal scores.

"They want to take their pound of flesh by joining the APC," the anti-graft crusader told AFP.

The APC insists that the PDP is crumbling because Jonathan has allowed graft to flourish, failed to improve infrastructure, including electricity supply, and bungled the fight against Boko Haram, a radical Islamist group that has killed thousands since 2009.

But some analysts argue that the real divisions in the PDP are linked to Nigeria's 2015 presidential and parliamentary polls.

Jonathan has so far refused to declare his plans but is widely expected to seek re-election, even as he has faced mounting pressure within his own party to stand aside.

He has been accused of breaking an unwritten rule in the PDP which calls for the presidency to rotate between Christians from the south, like Jonathan, and Muslims from the north.

Nigeria is Africa's most populous country and top oil producer, roughly divided between a most Christian south and a predominately Muslim north.

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