BBC Radio 1's Chris Moyles lost nearly 700,000 listeners in the three months to September, according to today's RAJAR figures, while the station dropped from 11.34 million to 11.11 million listeners.
Elsewhere at the corporation, Radio 4 added more than 750,000 listeners to achieve its biggest audience in a decade.
The Radio 1 breakfast show dropped from 7.72 million to 7.02 million listeners.
Meanwhile Radio 4 enjoyed audiences of 10.22 million people every week – up from 9.45 million last year and 10 million last quarter. The figures are the highest since the current methodology began in 1999. The Today programme recorded 6.60 million listeners – up nearly half a million on the same time last year.
Radio 2 also recorded an increase in station reach – up from 13.42 million last quarter (and 13.06 million last year) to 13.62 million, although Wake Up To Wogan lost listeners quarter-on-quarter – down from 7.93 million to 7.76 million.
Radio 3 posted its biggest audience in five years, attracting 2.2 million listeners every week, up from 1.95 million last year and 2.02 million last quarter. 5 Live dropped a fraction of its audience, down from 6.415 million last quarter to 6.39 million listeners.