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The Syllable Inventory of the Basay Yilan Dialect (source=T+M)

Evidence of Phonological Contact with Kavalan

Tsai, Y.-k. (2026). The syllable inventory of the Basay Yilan dialect (source=T+M): Evidence of phonological contact with Kavalan. basay.tw. https://basay.tw/research/2026-06-basay-syllable-TM/en/

@misc{tsai2026syllableTM_en,
  author = {Tsai, Yung-kuei},
  title  = {The Syllable Inventory of the {Basay} {Yilan} Dialect (source=T+M)},
  year   = {2026},
  month  = {6},
  url    = {https://basay.tw/research/2026-06-basay-syllable-TM/en/}
}

1. Introduction

1.1 The T and M Source Types

Both source=T and source=M in the Basay lexical database represent Trobiawan vocabulary data. Source=T contains entries collected from connected discourse (contextual collection), while source=M consists of isolated vocabulary items without sentence context. T and M share closely similar phonological profiles; they are treated as a single Trobiawan dataset (T+M) in this paper. Source S (113 entries), which shows extensive admixture of Kavalan vocabulary, is excluded.

1.2 Kavalan as a Contact Language

The Kavalan people (噶瑪蘭族) were the principal indigenous inhabitants of the Yilan Plain. Kavalan (噶瑪蘭語) is a Formosan Austronesian language documented to have uvular /q/, voiced fricative /z/, retroflex lateral /ɭ/, and voiced lateral fricative /ɮ/ (Li 2000) — precisely the phonemes that appear in T+M but are absent from source=B.

2. Method

Analysis followed the same procedure as the source=B paper. Source=S, =V, and PAN reconstructions were excluded.

Table 1. Orthography–IPA correspondence for source=T+M

Note: source=T+M contains no occurrences of the onset h, /ʃ/ (s'), or /tʃ/ (ts') — all of which are present in source=B.

3. Results

3.1 Comparison with Source=B

3.2 Syllable Structure Comparison

3.3 T+M-Exclusive Onsets

4. Discussion

4.1 The Contact Hypothesis

The six Kavalan-corresponding onset types in T+M (q, z, z', l', ml', vl') collectively account for approximately 176 occurrences across 34 syllable types. Their complete absence from source=B is the critical distributional fact. Under Thomason & Kaufman's (1988) framework, the high frequency and systemic integration of these phonemes in T+M suggests phonological borrowing at the system level, not mere lexical diffusion.

4.2 CVVC and Long-Vowel Structures

The 26 CVVC types in T+M (vs. 7 in B) include forms such as maan, laan, zaay, zian, and z'ian. Kavalan distinguishes phonological vowel length and allows CVVC structures (Li 2000). The parallel increase in CVVC types in T+M — particularly involving the z and z' onsets which are themselves Kavalan-derived — supports the contact hypothesis at the level of syllable structure.

4.3 Source=B Onsets Absent from T+M

The absence of h, /ʃ/ (s'), and /tʃ/ (ts') from T+M deserves attention. Kavalan lacks an onset /h/ phoneme; the loss or non-transfer of /h/ in T+M may reflect contact-induced attrition. The absence of the palatal series /ʃ/ and /tʃ/ may similarly reflect convergence toward the Kavalan phonological type, which lacks these segments.

5. Conclusion

The T+M Yilan dialect data yield 315 syllable types across 38 onsets. Six onset categories exclusive to T+M correspond to Kavalan phonemes, constituting evidence of phonological contact with Kavalan in the Yilan Plain. The CVVC and cluster expansions reinforce this conclusion at the level of syllable structure. Conversely, the native-vocabulary phonemes /h/, /ʃ/, and /tʃ/ are absent from T+M, suggesting contact-induced attrition. These findings reframe T+M not as a straightforward dialect of Basay but as a contact variety in which Kavalan phonological influence is substantial.

References

• Blust, R. (1999). Subgrouping, circularity and extinction. In E. Zeitoun & P. J.-K. Li (Eds.), Selected papers from the Eighth International Conference on Austronesian Linguistics (pp. 31–94). Academia Sinica.
• Blevins, J. (1995). The syllable in phonological theory. In J. A. Goldsmith (Ed.), The handbook of phonological theory (pp. 206–244). Blackwell.
• Li, Paul Jen-kuei. (1996). The Formosan Tribes and Languages in I-Lan. Yilan: Yilan County Government.
• Li, Paul Jen-kuei. (2000). The Phonological System of Taiwan Austronesian Languages. Taipei: Crane Publishing.
• Thomason, S. G., & Kaufman, T. (1988). Language contact, creolization, and genetic linguistics. University of California Press.
• Institute of Linguistics, Academia Sinica (Ed.). Basay Lexical Database (basay_dict.jsonl). Taipei: Academia Sinica.

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