The Bruins acquired both Rolston and Mottau from the Islanders in exchange for minor-leaguers Marc Cantin and Yanick Riendeau. They also picked up Zanon from the Minnesota Wild for Steve Kampfer.
Zanon, who is in the final year of a three-year contract he signed with the Wild on July 1, 2009, may have been acquired in response to the concussion symptoms that Johnny Boychuk is currently feeling. Boychuk missed practice on Monday and is listed as day-to-day after getting hit hard in Saturday's game by Ottawa forward Chris Neil.
Zanon has played 39 games (he missed more than a month earlier in the season) and has averaged 18:37 of ice time for the Wild this season. He's a rugged blueliner who has 104 blocked shots and has been credited with 77 hits this season. He previously played three seasons with the Nashville Predators.
Kampfer has played just 10 games, and none since Jan. 31, for the Bruins this season. He was part of their Black Aces crew during last year's Stanley Cup run.
The Islanders placed Rolston on waivers Saturday. He cleared Monday, and a few hours later was dealt along with Mottau, who returned to the lineup Sunday after missing more than two months with a concussion.
Rolston, who is 39 years old, has 9 points in 49 games with the Islanders this season. He is in the final year of a four-year, $20 million contract he signed with New Jersey in 2008.
Bruins fans should be familiar with both Rolston and Mottau. Rolston played four-plus seasons with the Bruins from 2000-04 and Mottau, who is from Quincey, Mass., played four years at Boston College, winning the Hobey Baker Award in 2000.