MEXICO CITY -- Like planets gone slightly wobbly in orbit, a string of Western Hemisphere nations fretted openly Wednesday about the death of Venezuela’s Hugo Chavez, whose skein of relationships went far beyond mere rhetorical support to include major financial benefits.

Recognizing how much they owed Chavez – often quite literally – nations across the region declared at least a day of mourning for the fiery Venezuelan leader. Cuba declared two days. Argentina, Brazil and the Dominican Republic declared three.

Some 17 countries gained benefits under Chavez’s Petrocaribe program, under which Venezuela sent about 10 percent of its crude oil production to member states under generous terms. It permitted them to partially repay in goods or services – sugar, beans, rice – rather than in cash. Many now wonder about the program’s future.

A handful of Latin leaders thrived under Chavez’s large ideological umbrella – in Bolivia, Ecuador and Nicaragua – but even larger nations such as Argentina and Brazil felt his gravitational pull on their economies. Flowery tributes flowed in.

“Wherever you are, dear Hugo, our promise now more than ever is to take no step backward to fulfill your dreams,” said President Rafael Correa of Ecuador.

“Long live Chavez!” Daniel Ortega, Nicaragua’s president, shouted at a rally in Managua, a huge portrait of Chavez behind him. Chavez gave an estimated $2.6 billion to Nicaragua over the past six years. At least some of that went directly to Ortega and his ruling party and made Ortega, who began his political career a die-hard socialist, into one of his country’s wealthiest men.

Presidents Jose Mujica of Uruguay and Cristina Fernandez of Argentina arrived in Caracas overnight on Fernandez’s presidential plane. Among the first to arrive Wednesday was Bolivian President Evo Morales. An aide described Fernandez as “very anguished” over Chavez’s death.

Smaller nations not openly associated with Venezuela – Jamaica and the Dominican Republic, in particular – worry about the future of Petrocaribe and count on Chavez’s anointed successor, interim President Nicolas Maduro, remaining in power.

“There’s going to be a lot of hope that Mr. Maduro wins the election,” said Mark Kirton, a specialist in Latin America at the University of the West Indies.

Venezuela sent more than 240,000 barrels a day of crude last year to Petrocaribe member states. Crude oil production is controlled by the state oil company, Petroleos de Venezuela S.A.

“PDVSA has been nothing more than Santa Claus for a number of countries,” said Anthony T. Bryan, a Caribbean specialist who’s a senior associate at the Center for Strategic and International Studies, a research center in Washington.

Under the largesse of the Petrocaribe program, member nations pay only 5 to 50 percent upfront for the oil. After a grace period of one to two years, they pay the balance over terms of 17 to 25 years, at a 1 percent interest rate.

“It has really saved some Caribbean countries from collapse,” Bryan said.

Foremost is Cuba. Havana gets about two-thirds of its oil from Venezuela – nearly 100,000 barrels a day – and repays part of the cost by deploying some 35,000 Cuban doctors, nurses and teachers to work in Venezuela.