A combination of plummeting advertising revenue and the public increasingly turning to the Internet for non-local news could mean a shrinking newspaper role for The Associated Press, long a stalwart of daily print reports.

In recent months, a handful of daily newspapers have sent cancellation notices to the AP, which is a nonprofit collaborative owned and operated by its approximately 1,500-member news organizations.

Although the AP's board of directors approved a rate restructuring in July that could save member newspapers a ...