Candidates have pledged to fight crime and improve the struggling economy, amid unemployment woes which have increased migration.
Mining is a top contributor to Ecuador's economy, but Perez, an erstwhile water activist, said late on Thursday he would ask the country's comptroller to review contracts suspected of polluting, to define their continuity under Ecuadorean law.
He would approach Ecuador's multilateral creditors and bondholders to ask for payment extensions because of the difficult economic and security situation, he said.
Perez pledged to make agriculture - not oil, the country's top source of income - Ecuador's economic driver, creating 500,000 jobs.
Better social programs and data-based security programs are also on his agenda if elected, he said.
Persons:
Yaku Perez, Fernando Villavicencio, Perez, Alexandra Valencia, Julia Symmes Cobb, Sharon Singleton
Organizations:
Reuters, United Nations, International Monetary Fund, Thomson
Locations:
QUITO, Ecuador, Peru, Chile, Quito