Phân bố địa lý của họ Tắc kè Gekkonidae ở miền Bắc Việt Nam: Vai trò của sông Hồng là biên giới tự nhiên

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Tác giả: Đức Minh Lê, Thị Hạnh Ngô, Quảng Trường Nguyễn, Thị Hồng Vân Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại: 591.9 Treatment of animals by specific continents, countries, localities

Thông tin xuất bản: Khoa học công nghệ Việt Nam, 2018

Mô tả vật lý: 23-28

Bộ sưu tập: Metadata

ID: 536932

Thêm vào giỏ

Miền Bắc Việt Nam, vùng địa lý nằm ở phía Bắc của sông Lam thuộc tỉnh Nghệ An, là nơi có nhiều loài mới thuộc họ Tắc kè (Gekkonidae) được mô tả trong những năm gần đây. Tuy nhiên, có nhiều vùng trong khu vực này chưa được nghiên cứu chi tiết như các dãy núi đá vôi ở vùng giáp với biên giới Trung Quốc và Lào thuộc các tỉnh Hà Giang, Lai Châu và Sơn La. Để nghiên cứu mức độ đa dạng của các loài Tắc kè và quá trình tiến hóa của chủng ở miền Bắc Việt Nam, các tác giả đã tiến hành giải trình tự gen ty thể NADH dehydrogenase suhunit 2 (ND2) cho các nhánh tiến hóa khác nhau thuộc nhóm loài "Gekko palmatus" và giống Hemiphyllodactylus trong họ Gekkonidae. Kểt quả nghiên cứu cho thấy có sự phân tách rõ ràng về mặt di truyền giữa các quần thể của hai giống này tại các vùng phân bổ khác nhau ở miền Bắc Việt Nam, chứng tỏ còn có nhiều loài ẩn sinh (cryptic species) chưa được mô tả của hai nhóm này. Ngoài ra, các phân tích dựa trên cây phát sinh loài bước đầu cho thấy sông Hồng có thể có vai trò quan trọng trong việc ngăn cản quá trình trao đổi di truyền giữa các quần thể và loài thuộc giống Hemiphyllodactylus nằm ở vùng phía Đông và Tây của sông Hồng. Tuy nhiên, sông Hồng lại không có vai trò là ranh giới tự nhiên với các nhánh di truyền và loài thuộc nhóm Gekko palmatus vì các quần thể và loài thuộc nhóm này không có sự phân tách rõ ràng giữa vùng phía Đông và Tây của sông Hồng. Như vậy, sông Hồng có thể không phải là biên giới tự nhiên đối với tất cả các loài ở khu vực phía Bắc của Việt Nam.Northern Vietnam, the geographic region located in the north of Lam River of Nghe An Province, is the place where new species discoveries in the family Gekkonidae have been recorded in recent years. However, many sites in the region have not been studied thoroughly, especially the northern limestone mountains near border areas among Vietnam, Laos, and China which belong to Ha Giang, Lai Chau, and Son La Provinces. To further investigate the gecko diversity and their evolution in the Northern Vietnam, the authors sequenced a mitochondrial gene, NADH dehydrogenase subunit 2 (ND2), for evolutionary distinct lineages of two karstadapted groups, Gekko palmatus and Hemiphyllodactylus in the region. The results showed that several undescribed lineages of both Gekko palmatus and Hemiphyllodactylus were genetically distinct, illustrating the high level of cryptic diversity within Gekkonidae in the region. In addition, based on the derived phylogenetic hypothesis, the preliminary results suggested that Red River might play an important role in separating lineages of Hemiphyllodactylus from western and eastern sides of the river. However, this well-known natural barrier exhibited almost no impact on disrupting gene flows between populations of Gekko palmatus from two sides of the river. It is concluded that Red River does not serve as a natural barrier for all species distributed in the Northern Vietnam.

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