Ottawa came to include Potawatomi and Ojibwe loanwords. Two subdialects of Ottawa arise from these population movements and the subsequent language shift. The subdialects are associated with the ancestry of significant increments of the populations in particular communities and differences in the way the language is named in those locations. On Manitoulin Island, where the population is predominantly of Ottawa origin, the language is called Ottawa, and has features that set it off from other communities that have significant populations of Southwestern Ojibwe (Chippewa) and Potawatomi descent. In the latter communities, the language is called Chippewa but is still clearly Ottawa. Dialect features found in "Ottawa Ottawa" that distinguish it from "Chippewa Ottawa" include deletion of the sounds w and y between vowels, glottalization of w before consonants, changes in vowel quality adjacent to w, and distinctive intonation. Phonology Ottawa has seventeen consonants and seven oral vowels; there are also long nasal vowels whose phonological status is unclear. In this article, Ottawa words are written in the modern orthography described below, with phonetic transcriptions in brackets using the International Phonetic Alphabet (IPA) as needed. The most prominent feature of Ottawa phonology is vowel syncope, in which short vowels are deleted, or in certain circumstances reduced to schwa , when they appear in metrically defined weak syllables. Notable effects of syncope are: Differences in pronunciation between Ottawa and other dialects of Ojibwe, resulting in a lower degree of mutual intelligibility. Creation of new consonant clusters that do not occur in other dialects, through deletion of short vowels between two consonants. Adjustments in the pronunciation of consonant sequences. New forms of the person prefixes that occur on nouns and verbs. Variability in the pronunciation of words that contain vowels subject to syncope, as speakers frequently have more than one way of pronouncing them. Consonants The table of consonants uses symbols from the modern orthography with the corresponding symbol in the International Phonetic Alphabet (IPA) following where the two vary, or to draw attention to a particular property of the sound in question. The plosive, fricative, and affricate consonants are divided into two sets, referred to as fortis and lenis. Fortis (or "strong") consonants are typically distinguished from lenis (or "weak") consonants by features such as greater duration or length, are voiceless where lenis consonants are typically voiced, and may be aspirated. In Ottawa, each fortis consonant is matched to a corresponding lenis