(People attend a Lag Ba-Omer celebration at El Ghiba synagogue in Djerba island May 21, 2011. REUTERS/Anis Mili )

In the Jewish quarters on the Tunisian island of Djerba, only menoras or Hebrew letters painted in blue against the whitewashed walls distinguish a Jewish home from the Muslim family living next door.

Mainly Muslim Tunisia is home to one of North Africa’s largest Jewish communities. Though they now number less than 1,800 people, Jews have lived in Tunisia since Roman times.

The El Ghriba synagogue in Djerba, home to most of Tunisia’s Jews, is built on the site of a Jewish temple that is believed to date back almost 1,900 years and attracts pilgrims each year.

But more than a year after Tunisia’s revolution ousted Zine al-Abidine Ben Ali and sparked uprisings around the region, uncertainty over the democratic transition and threats by some Salafi Islamists have begun to raise fears that decades of peaceful co-existence could begin to erode.