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Distribution and Population Genetic Structure of the Hau Giang Medaka, Oryzias haugiangensis, Along the East Coast of the Indochinese Peninsula
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Abstract
The east coast of the Indochinese Peninsula is a well-known transition zone from subtropical to tropical systems, yet only a small number of studies have been conducted on the biogeography and phylogeography of aquatic organisms in this region. The Hau Giang medaka, Oryzias haugiangensis, was originally described from the Mekong Delta in southern Vietnam, and later reported also from southeastern Thailand, west of the Mekong Delta region. However, the species' full geographic range and population genetic structures remain unknown. Field surveys showed a widespread distribution of this species along the east coast of the Indochinese Peninsula, as far as northern Vietnam. A mitochondrial gene phylogeny and population genetic structure analysis using genome-wide single nucleotide polymorphisms revealed that the populations of O. haugiangensis are highly structuralized along the east coast of Vietnam, with the southernmost Mekong Delta population clearly separated from three populations north of central Vietnam. Further field collections are necessary to determine the boundary between the southern and northern populations, and the presence or absence of a hybrid zone.
Received 16 12月 2023
Accepted 06 1月 2024
Acknowledgments:
Field collection in Da Nang City was conducted under a Memorandum of Agreement for joint research between Hanoi National University of Education (HNUE) and Okinawa Institute of Science and Technology Graduate University (OIST). We thank Nguyen Van Minh, Nguyen Lan Hung Son, Duong Minh Lam (HNUE), Peter Gruss, and Hiroyo Clemente (OIST) for their support of this collaboration; Pham Anh Cuong (Ministry of Natural Resources and Environment of Vietnam [MONRE]) and Ho Ky Minh (Da Nang City) for authorizing our field surveys; Vo Tuan Nhan (MONRE) for providing export permits for the specimens (No. 2343/QĐ-BTNMT issued in 2019 and No. 2128/QĐ-BTNMT issued in 2023); and Tran Long Hung, Ta Kieu Anh (MONRE), Masanori Nakae (National Museum of Nature and Science, Japan), and Kaneyasu Yoseda (OIST) for their assistance in transferring the specimens for this research. Laboratory stock individuals were provided by the National Bio-Resource Project (NBRP) of the Ministry of Education, Culture, Sports, Science and Technology of Japan. We thank Midori Iida (Niigata University), Ha Manh Linh (Nagasaki University), the late Chu Hoang Nam (HNUE), and Chu-Hong Liao (University of the Ryukyus) for assistance with the field collections and laboratory experiments. We also thank Cynthia Kulongowski of Edanz (http://jp.edanz.com/ac) for editing a draft of this manuscript. This study was supported by the Vietnam National University Ho Chi Minh City to HDH (Grant Number GEN2019-18-01) and JSPS KAKENHI to HK (Grant Number 19J22686) and KY (Grant Number 21H04782).
© 2024 Zoological Society of Japan
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