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David Martin has joined the Dolphins. ((Jim McIsaac/Getty Images) )

The Miami Dolphins made numerous roster moves on Monday, adding tight end David Martin and deleting wide receiver Wes Welker, quarterback Joey Harrington and tight end Randy McMichael.

Martin, a 27-year-old free agent, was inked to a three-year contract, while Welker was traded to the New England Patriots for second- and seventh-round draft picks.

Harrington and McMichael were released outright.

"It is always hard to part ways with individuals who have helped you win in the past," Dolphins rookie head coach Cam Cameron said. "But it's part of the business and it's the most difficult aspect of this job."

Martin started in four of 11 games for the Green Packers last season, posting 21 receptions for 198 yards and two touchdowns.

He has caught 87 passes for 766 yards and nine touchdowns in 70 NFL games (21 starts) since being drafted by Green Bay in the sixth round (198th overall) in 2001.

"David is a talented tight end who will be a major contributor to our offence," Cameron said. "He is very athletic, with good speed, and is a quality receiver."

Welker caught a career-high 67 passes for 687 yards and a touchdown in 16 games (three starts) last season, his fourth in the NFL.

The 26-year-old speedster also averaged 22.1 yards on 48 kickoff returns and 9.2 yards on 41 punt returns.

Harrington, 28, went 5-6 as Daunte Culpepper's injury replacment on the Dolphins, who acquired him from the Detroit Lions for an undisclosed pick last May 12.

Harrington completed 223-of-388 pass attempts for 2,236 yards and 12 touchdowns with 15 interceptions in 11 starts for Miami, but he was benched in the season finale.

McMichael was the most prolific tight end in franchise history, totalling 283 receptions for 3,096 yards and 18 touchdowns in 80 starts with the Dolphins.

But the 27-year-old veteran was due a $3-million US roster bonus.

"Apparently, this was an economic decision," said Drew Rosenhaus, McMichael's agent.

"He was surprised. But he is looking forward to a great opportunity elsewhere."

McMichael hasn't missed a single game since being selected out of Georgia in the fourth round (114th overall) by the Dolphins in the 2002 NFL draft.

With files from the Associated Press