Familiar faces took on some new roles Tuesday when Marie Gilmore ended her City Council term to become the Island's next mayor and Beverly Johnson left the top spot to join the council.

Newly-elected council member Rob Bonta was sworn in, while Frank Matarrese stepped down after serving eight years on the council.

Lena Tam, the top vote-getter in November's election, also officially began her second term Tuesday.

"It's very humbling the trust that you have placed in me to lead this community forward, along with my colleagues on the council," Gilmore told well-wishers and city leaders who had gathered at City Hall to watch her and the others receive the oath of office from Alameda County Superior Court Judge Yolanda Northridge.

Gilmore won a decisive victory Nov. 2, capturing more than 36 percent of the ballots cast in the mayoral race.

Matarrese came in second and Doug deHaan, who still has two years left in his council term, came in third.

A former attorney, Gilmore served on the city's Park and Recreation Commission before then-Mayor Bill Withrow nominated her to the Planning Board in July 1994.

Gilmore joined the council in September 2003 after the death of Councilmember Al DeWitt.

Both Gilmore and Bonta -- who the council elected as vice-mayor Tuesday -- thanked their families and supporters after they were sworn in and pledged to work closely with the community while in office.

Bonta said he was struck during the campaign by how much Island residents care about the city.

"While we may not agree on how to get there, apathy is not a problem," Bonta said. "We have a fully engaged citizenry."

As the top vote-getter in the council race, Tam will serve four years, while Johnson, who came in second, will complete Tam's term and serve two years.

Tam's victory comes in the wake of allegations that she leaked confidential city e-mails to SunCal Companies as its representatives and city leaders were negotiating over Alameda Point.

The Alameda County District Attorney's Office declined to file charges.

"It's been a very rough campaign for me, obviously," said Tam, who added that she will represent the city in good faith during her term.

Matarrese said he discovered that serving on the council was "a job I really, really love to do."

"I made mistakes and I hope Alamedans will pardon me for that," he said. "But I do feel that I have been on a council that left Alameda better than we found it."

Matarrese said he will regret not serving on the council as it tackles issues such as the redevelopment of Alameda Point.

State Assemblyman Sandre Swanson (D-Alameda) and Alameda County Supervisor Alice Lai-Bitker presented Johnson and Matarrese with resolutions honoring them during Tuesday's meeting.

"I admired your courage and passion during the difficult battles, particularly with the (Alameda Theatre & Cineplex) and garage," Lai-Bitker told Matarrese.

Rob Ratto of the Park Street Business Association presented Matarrese with a plaque for his work helping revitalize downtown.

Johnson said she was proud of what's happened under her watch, such as the redevelopment of Bridgeside Center.

"Despite the economic challenges, we have been able to move our community more forward than it had gone in decades," Johnson said. "And I know that because I was born here."

She said the city was now in a "sound but fragile" economic state.

"It's been a challenging time," Johnson said about her eight years as mayor. "But I'm not saying farewell, because I will still be here."