There’s one story on Boston’s TV news stations that won’t seem to go away: an exodus of on-air talent that has been depleting the ranks of local broadcasters in recent years.

Big names including WBZ-TV’s (Channel 4) Jon Keller and WHDH-TV’s (Channel 7) Kim Khazei are just the most recent examples of the accelerating flight of journalists from the airwaves. Across the Boston TV market, staff both in front of and behind the camera have been signing off for the last time.

While staff cuts and retirements are taking a toll, many of the departed staffers say there’s a deeper reason. Cost reductions by station owners, brought on by rapid technological changes and declining audiences , are making it difficult to do the job in a way that makes the long hours and high stress worthwhile.

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