bi·o·tur·ba·tion 
(bī′ō-tər-bāshən)
(bī′ō-tər-bāshən)n.
The stirring or mixing of sediment or soil by organisms, especially by burrowing or boring.
[German : bio-, bio- + Latin turbātiō, turbātiōn-, distrubance (from turbātus, past participle of turbāre, to stir up; see DISTURB).]
bio·turbed′ (-tûrbd′) adj.