Last Friday, following talks between Prime Minister Alexis Tsipras and the European migration commissioner, Dimitris Avramopoulos, the authorities moved 100 migrants from the camp to facilities in northern Greece. On Monday, 444 people more were moved, and an additional 1,000 will be relocated by the end of the week, Migration Minister Dimitris Vitsas told Greek radio on Tuesday. He also said that people would also be moved out of crowded centers on the islands of Samos and Chios.

“The goal is to relocate 6,000 to 7,000 people to mainland Greece by November,” he said. “There needs to be redistribution across Europe,” he added, but some countries have resisted a European Union plan to share the burden.

The International Rescue Committee’s Greece director, Jana Frey, said she welcomed the government’s effort, but added, “It comes far too late.” The camps in northern Greece were already nearly full, she said.

In many European countries, anti-migrant sentiment rose even as the flow of people declined, contributing to gains by right-wing parties. In Italy, the League party, headed by Mr. Salvini, and the anti-establishment Five Star movement made gains in elections this year, formed a coalition, and entered government for the first time.

On Monday, the cabinet adopted an emergency decree, drafted by Mr. Salvini, that would eliminate some grounds for migrants to be permitted to remain in Italy, like fleeing anti-gay persecution, and would allow the authorities to detain migrants for up to 180 days, rather than 90. To take effect, the decree must be approved by Parliament — where the governing coalition has a large majority — and President Sergio Mattarella.

“This is a step toward making Italy safer,” Mr. Salvini said in a tweet.

Although the number of migrants attempting the hazardous sea journey from Libya to Southern Europe has decreased, the route has become even deadlier, and European countries continue to argue over who should be responsible for rescuing those who are shipwrecked.

After Italy refused permission for rescue ships to dock this summer, European countries bickered over the fate of one vessel, the Aquarius, which was carrying more than 600 people. The ship ultimately landed in Spain, and its passengers were taken in by multiple countries.