Gibbon D. FORMAL IS NATURAL: TOWARD AN ECOLOGICAL PHONOLOGY. POZNAN STUDIES IN CONTEMPORARY LINGUISTICS. 2009;45(1):73-102.Naturalism Phonology (NP) has a history of opposition to abstractness, to generative linguistics, to formalist approaches, and differs from these in its strong focus on external rather than distributional, structural evidential domains. But evidence domains are orthogonal to empirical and formal methods, and, like formalist theories such as Optimality Theory (OT), the pedigree of NP includes structuralist and generative phonology. In an analysis which is sympathetic to both NP and OT, this contribution examines the relation between NP and OT, analyses a classic OT case study of syllabification in Tashlhiyt Berber, and p...