(Updates with polls closing)

QUITO/GUAYAQUIL, Oct 15 (Reuters) - Ecuadoreans voted on Sunday for their next president, weighing pledges to improve the economy and control a spiraling security situation from a businessman who is heir to a banana fortune and a leftist who would be the country's first woman leader.

Voters' top concerns largely center on the economy, which has struggled since the coronavirus pandemic and motivated many thousands of Ecuadoreans to migrate, and rising crime, including increases in murders, robberies and prison riots.

The violence, which the outgoing government blames on drug gangs, reached a crescendo during the campaign with the murder of anti-corruption candidate Fernando Villavicencio, who was shot dead while leaving a Quito campaign event in August.

Business scion Daniel Noboa, 35, has led recent polling, but at least two surveys placed him and Luisa Gonzalez, a protege of former President Rafael Correa, within the margin of error.

Results, which Noboa awaits in the seaside town of Olon while Gonzalez waits for them at a hotel in Quito, are expected beginning at 6:30 p.m. local time (11:30 GMT).

Polling firm Estrategas Infinity said its exit poll of more than 32,000 voters showed a seven point lead for Noboa, giving him victory with 53.85% over Gonzalez's 46.15%.

Gonzalez, a 45-year-old former lawmaker, won 34% of the vote in a first round.

"We are confident that the Ecuadorean people will vote with memory, heart, for a country with dignity and rights," Gonzalez said after voting in Canuto early in the morning.

Gonzalez has said she would bring back popular social spending that characterized Correa's decade in power, pledging free medicine, increased worker protections and direct aid to those in need.

She has also promised to use $2.5 billion from international reserves to shore up the economy and said on Sunday afternoon she would urgently seek to raise local government budgets and inject reserve funds.

"Right now we don't have social or economic stability. I worry about the future of my children," said Gonzalez voter Erika Granja, 43, in southern Guayaquil.

"I work every day for them and for them I want a better country," she said, adding that recent governments have "left the country in pieces."

Noboa, also an ex-lawmaker who has promised job creation - especially for young people - was a surprise entrant to the run-off, winning 23% in the first round.

He is the son of multimillionaire banana magnate Alvaro Noboa, who himself ran unsuccessfully for president numerous times.

"The people want zero impunity, the people want progress, the people want jobs and young people want hope," Noboa said after casting his ballot in Santa Elena.

"We need the hope of a prepared candidate and (Noboa) is that," said Guayaquil university student Estefano Ruales, 25. "We need the hope that he takes the correct path to improve the situation in our Ecuador."

His taxi driver father was murdered during a robbery seven months ago, Ruales said, and he fears a Gonzalez victory would worsen insecurity.

TIGHT RACE

The national electoral council said on Friday some 825 Ecuadoreans in Nicaragua, Russia, Belarus and Israel would not be able to vote either because of a lack of consular presence or war, in a move criticized by Correa on social media.

Noboa's vice-presidential candidate Veronica Abad said she would be at the council monitoring voting reports.

Some 82% of eligible Ecuadoreans voted, council president Diana Atamaint told a press conference just after polls closed.

Authorities will look into a social media video showing a person marking multiple ballots in the province of Sucumbios, she said in the afternoon.

Outgoing President Guillermo Lasso called the election early to avoid impeachment on charges he disregarded warnings of embezzlement at a state company. He has denied the charges.

The winner will govern only from this December until May 2025, when the victor of regularly-scheduled elections will take office.

A Noboa victory initially could be perceived as positive by investors, but longer-term the market outlook would depend on who he appoints to top jobs, said Zulfi Ali, portfolio manager for PGIM.

"The market is going to look very closely at the policies, the initial statements, and also the composition of the cabinet, especially in Noboa's case," Ali said. "So while the first reaction is positive, because he's a pro-business candidate, pro-business and pro-markets can mean two different things."

Gonzalez has said Correa would be her top economic advisor, while both candidates have said they would balance compliance with the terms of Ecuador's foreign debt with the needs of the population.

On security, Gonzalez has pledged to build a new prison outside Guayaquil, while Noboa has said the most dangerous convicts should be held on prison boats.

Both have pledged to beef up security at ports and airports, hot spots for drug smuggling.

Gonzalez enjoys the backing of Correa's Citizens' Revolution party, while Noboa formed his own party, National Democratic Action.

Citizens' Revolution won more seats in the national legislature than any other party in August elections, but does not have a majority.

Both candidates have tried to woo young people. About a quarter of the 13 million Ecuadoreans obliged to vote are between the ages of 18 and 29. (Reporting by Alexandra Valencia in Quito and Yury Garcia in Guayaquil; additional reporting by Tito Correa in Canuto and Rodrigo Campos in New York; Writing by Julia Symmes Cobb; Editing by Diane Craft, Bill Berkrot and Deepa Babington)