Description and Karyotype of a New Ricefish, Oryzias mekongensis, from Thailand

Uwa, Hiroshi; Magtoon, Wichian

doi:10.2307/1445005

Cited by 15 publications

(14 citation statements)

References 11 publications

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“…, 1993) described some of the remarkable variation in cytogenetic characters among Oryzias species, including chromosome number and constitution and cellular DNA content. Investigations by Uwa and colleagues also included description of a new species, Oryzias mekongensis Uwa & Magtoon, 1986, and a new subspecies, Oryzias latipes sinensis Chen, Uwa & Chu, 1989, recognized herein at the species level, as in Kottelat (2001a, b).…”

Section: Introductionmentioning

confidence: 99%

A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae)

Parenti

2008

Zoological Journal of the Linnean Society

134

168

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Ricefishes, known best by the model organism, the medaka, Oryzias latipes Temminck & Schlegel, 1846, comprise the family Adrianichthyidae, which ranges broadly throughout fresh and brackish waters of Central, South and Southeast Asia and the Indo-Malay-Philippines Archipelago as far east as Timor. Twenty-eight Recent species are recognized here in two monophyletic genera, Adrianichthys and Oryzias. Xenopoecilus and Horaichthys are placed in synonymy of Oryzias for the first time. Adrianichthys comprises four species from Lake Poso, Sulawesi, Indonesia. Oryzias comprises 24 species that live throughout the range of the family. A fossil genus and species, †Lithopoecilus brouweri from the Miocene of central Sulawesi, is included tentatively in the Adrianichthyidae. Evidence for the sister group relationship of adrianichthyids and exocoetoids is reviewed briefly and that relationship corroborated. Monophyly of adrianichthyids is likewise strongly supported here. Species groups within Oryzias are diagnosed as monophyletic largely based on osteology, colour pattern and meristic variation. They correspond only in part to species groups previously recognized based on chromosome constitution. Miniature species do not comprise a monophyletic group; disjunct absolute size in close relatives has evolved repeatedly. Oryzias latipes is a member of a species complex that includes O. luzonensis, O. curvinotus and the miniatures O. sinensis and O. mekongensis. A new species, Oryzias bonneorum sp. nov.

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Section: Introductionmentioning

confidence: 99%

A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae)

Parenti

2008

Zoological Journal of the Linnean Society

134

168

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“…Observations and speculations on zoogeography and diversity of the freshwater fishes of Southeast Asia are primarily based on the evidence presented by various workers such as Anderson & Collette (1991), Inger & Chin (1962), Kottelat (1985Kottelat ( , 1989Kottelat ( , 1990, Ng & Lim (1990), Parenti (1989), Roberts (1980Roberts ( , 1982aRoberts ( , 1982bRoberts ( , 1986Roberts ( , 1989, Smith (1945), Taki (1974), Uwa & Magtoon (1986) Weber & de Beaufort (1913, 1916, and Zakaria-Ismail (1987. Studies on changes in the species composition in the Gombak River, Peninsular Malaysia were carried out in 1985 and 1990 to provide evidence of the impact of land development on fish communities.…”

Section: Methodsmentioning

confidence: 99%

Zoogeography and biodiversity of the freshwater fishes of Southeast Asia

Zakaria-Ismail

1994

Hydrobiologia

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The ichthyofauna of the freshwater system of Southeast Asia is extremely diverse. A recent estimate of about 1000 species is probably an understatement. More than 10 new species are being added to the list annually. The distribution pattern of the Southeast Asian freshwater fishes can be divided into five zoogeographic regions. The first one is the Salween basin in Burma, with fishes mainly of the Indian subcontinent origin such as Amblypharyngodon atkinsoni, Bangana almorae and Brachydanio jayarami. The second zoogeographic area is the Mekong, Chao Phraya and Mae Khlong drainages which harbour fishes typical of the mainland of Southeast Asia such as Acanthorhodeus deignani, Barbichthys nitidus and Cirrhinus siamensis. The Malay Peninsula is the third region whose species composition is heavily influenced by the Siamese (such as Homaloptera smithi, Tuberoschistura baenzigeri and Botia beauforti) and Indonesian (such as Botia hymenophysa, Luciocephalus pulcher and Parosphromenus deissneri) elements. The islands of Sumatra, Borneo and Java are the fourth zoogeographic area of fish distribution. These islands show a high degree of endemism, especially in fishes of the family Belontiidae. Finally, the freshwater system of the Philippines is the last zoogeographic region of Southeast Asia. The area is characterized by the presence of closely related species of the cyprinids especially in Lake Lanao. Currently, high diversity of these freshwater fishes is being threatened by land development, such as deforestation, road construction and land expansion for plantation. Recent studies in the Gombak River basin show the extermination of 41 per cent of native fish species from 1969 to 1990. This is probably due to the construction of highways, logging, as well as land clearing for agriculture.

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“…In O . latipes and its related species (O. curvinotus, O. luzonensis and O. mekongensis) , there is variation in the number of biarmed chromosomes Uwa et al, 1982Uwa et al, , 1988Uwa, 1986Uwa, , 1991Formacion and Uwa, 1985;Uwa and Magtoon, 1986;Uwa and Jeon, 1987], although the diploid chromosome numbers in all species in this group (2n = 46-48) are almost the same as those of members of the acrocentric chromosome group . By contrast, the celebensis species group (O. celebensis, O. nigrimas, O. matanensis, and O. marmoratus) shows far fewer chromosomes (2n = 36-42, FN = 48-50) than the other 2 groups Uwa, 1986].…”

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confidence: 91%

Divergence of Repetitive DNA Sequences in the Heterochromatin of Medaka Fishes: Molecular Cytogenetic Characterization of Constitutive Heterochromatin in Two Medaka Species: Oryzias hubbsi and O. celebensis (Adrianichthyidae, Beloniformes)

Uno

Asada²,

Nishida³

et al. 2013

Cytogenet Genome Res

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The large biarmed chromosomes of Oryzias celebensis [2n = 36, fundamental arm number (FN) = 48] are considered to have resulted from fusions of acrocentric chromosomes in the ancestral karyotype of Oryzias, which is retained in O. hubbsi (2n = 48, FN = 48). To understand the molecular evolution of heterochromatin associated with karyotype reorganization in medaka fishes, we cloned 3 and 6 novel families of heterochromatin-related repetitive DNA sequences from O. hubbsi and O. celebensis, respectively, and characterized them using molecular cytogenetics. Two AT-rich repetitive sequences isolated from the genomic DNA of O. hubbsi, a 164-bp satellite DNA (OHU-RsaI-Scen) and a 177-bp telomere-specific repeat (OHU-RsaI-Stelo), were shown to be major components of the constitutive heterochromatin of centromeres and telomeres, respectively. A GC-rich 326-bp sequence, named OHU-AluI-M1, was colocalized with the 18S-28S ribosomal RNA gene cluster to a single autosomal pair of chromosomes and the W chromosome. In O. celebensis, 2 major satellite DNA sequences (the AT-rich 157-bp OCE-AluI-Scen sequence and the 186-bp OCE-HinfI-Scen sequence) were identified in the centromeric regions of almost all chromosomes. The 197-bp OCE-HinfI-S6 sequence was located in the centromeric and distal and/or interstitial heterochromatin of almost all chromosomes, and the 191-bp OCE-HinfI-S8 sequence was located in 6 pairs of chromosomes. Constitutive heterochromatin on the short arm of large submetacentric chromosome 5 was composed of at least 3 different repetitive sequences: the 171-bp OCE-AluI-S18 sequence, the 197-bp OCE-HinfI-S6 sequence and the 172-bp OCE-HinfI-S11 sequence. All families of repeated sequences showed no nucleotide sequence similarity with each other and high species-specificity among 7 different species. These results suggest that the heterochromatin of O. hubbsi and O. celebensis consists of various types of repetitive sequence and that the sequences evolved independently and were then amplified site-specifically in each lineage after karyotype reorganization occurred in the ancestral karyotype.

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Description and Karyotype of a New Ricefish, Oryzias mekongensis, from Thailand

Cited by 15 publications

References 11 publications

A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae)

A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae)

Zoogeography and biodiversity of the freshwater fishes of Southeast Asia

Divergence of Repetitive DNA Sequences in the Heterochromatin of Medaka Fishes: Molecular Cytogenetic Characterization of Constitutive Heterochromatin in Two Medaka Species: <b><i>Oryzias hubbsi</i></b> and <b><i>O. celebensis</i></b> (Adrianichthyidae, Beloniformes)

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