 Also, it has been noted that Haplogroup O-M119 lineages among populations of continental Southeast Asia outside of China display a reduced level of diversity when compared with populations of South China and insular Southeast Asia, which may be evidence of a bottleneck associated with the westward migration and settlement of ancestral Tai–Kadai-speaking populations in Indochina.Haplogroup O-M119 lineages are found primarily in Southeast Asian populations of Malaysia, Vietnam, Indonesia, the Philippines, southern China and Taiwan .High frequencies of this haplogroup have been found in populations spread in an arc through southeastern China, Taiwan, the Philippines, and Indonesia.