High genetic diversity within the morphologically conservative dwarf loach, Kichulchoia brevifasciata (Teleostei: Cobitidae), an endangered freshwater fish from South Korea

Kim, Daemin; Conway, Kevin W.; Jeon, Hyung‐Bae; Kwon, Ye Seul; Won, Yong Jin

doi:10.1007/s10592-013-0462-2

Cited by 11 publications

(10 citation statements)

References 37 publications

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“…The zero migration rates between them suggest that there was no postcontact between these Cobitis species to such an extent as to exchange gene pool since the disconnection of the paleo-Korean rivers, although the sea-level has been continuously oscillated by the cyclic glaciations since the Pleistocene. Another supporting evidence for the association between the evolution of Cobitis fish and the paleoceanographic changes in the late Pliocene comes from a divergence time estimation, 3.21 MYA, between two other sister species of Cobitidae, Iksookimia hugowolfeldi from the Youngsan River and I. longicorpa from the Seomjin River (Kim et al 2013). We consider that the river disconnection events influenced by the sea-level changes around the late Pliocene could be served as a very important hypothetic framework for the evolutionary study of Korean freshwater fishes.…”

Section: Discussionmentioning

confidence: 92%

“…Among the sequences of the three markers, those of eight species (C. choii, Kichulchoia brevifasciata, K. multifasciata, Koreocobitis rotundicaudata, Iksookimia hugowolfeldi, I. longicorpa, I. pacifica, and I. koreensis) were obtained from Kim et al (2013). To include complete Cobitidae genera in this analysis, the sequences of two species belonging to the genus Misgurnus (M. anguillicaudatus and M. mizolepis) were also acquired in the present study through PCR amplification following the methods described previously (Kim et al 2013). Unfortunately, the Ptr gene was excluded in this analysis because it was difficult to obtain clear sequences in some species because of a number of heterozygotic sites.…”

Section: Pcr and Analysis Of Dna Sequence Datamentioning

confidence: 99%

“…A birth-death model was used for a prior tree. The calibration time was given at the ancestral node of the genera Cobitis, Iksookimia, and Kichulchoia as 18 million years ago (MYA), according to the oldest fossil record of C. longipectoralis, using a lognormal distribution with a mean of 1.5, a standard deviation of 1.3, and an offset of 17.5 (55.53-18.03 MYA, 95% highest posterior density (HPD)) (Chen et al 2010;Kim et al 2013).…”

Section: Pcr and Analysis Of Dna Sequence Datamentioning

confidence: 99%

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Genomic replacement of nativeCobitis lutheriwith introducedC. tetralineatathrough a hybrid swarm following the artificial connection of river systems

Kwan

Won

2014

Ecology and Evolution

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River connections via artificial canals will bring about secondary contacts between previously isolated fish species. Here, we present a genetic consequence of such a secondary contact between Cobitis fish species, C. lutheri in the Dongjin River, and C. tetralineata in the Seomjin River in Korea. The construction of water canals about 80 years ago has unidirectionally introduced C. tetralineata into the native habitat of C. lutheri, and then these species have hybridized in the main stream section of the Dongjin River. According to the divergence population genetic analyses of DNA sequence data, the two species diverged about 3.3 million years ago, which is interestingly coincident with the unprecedented paleoceanographic change that caused isolations of the paleo-river systems in northeast Asia due to sea-level changes around the late Pliocene. Multilocus genotypic data of nine microsatellites and three nuclear loci revealed an extensively admixed structure in the hybrid zone with a high proportion of various post-F1 hybrids. Surprisingly, pure native C. lutheri was absent in the hybrid zone in contrast to the 7% of pure C. tetralineata. Such a biased proportion must have resulted from the dominant influence of continually introducing C. tetralineata on the native C. lutheri which has no supply of natives from other tributaries to the hybrid zone due to numerous low-head dams. In addition, mating experiments indicated that there is no discernible reproductive isolation between them. All the results suggest that the gene pool of native C. lutheri is being rapidly replaced by that of continually introducing C. tetralineata through a hybrid swarm for the last 80 years, which will ultimately lead to the genomic extinction of natives in this hybrid zone.

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Section: Discussionmentioning

confidence: 92%

Section: Pcr and Analysis Of Dna Sequence Datamentioning

confidence: 99%

Section: Pcr and Analysis Of Dna Sequence Datamentioning

confidence: 99%

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Genomic replacement of nativeCobitis lutheriwith introducedC. tetralineatathrough a hybrid swarm following the artificial connection of river systems

Kwan

Won

2014

Ecology and Evolution

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“…Cytochrome b (1140 bp) was amplified using polymerase chain reaction (PCR) with the primers GluDG-L (Palumbi 1996) and H15915 (Brito et al 1997) for the cypriniform fishes and L14724 and H15915 (sequences referred to Sullivan et al [2008]) for the siluriform fishes. The PCR condition followed Kim et al (2013). Automated sequencing was performed using Big Dye (Perkin-Elmer, Foster City, CA, USA) terminator cycle sequencing on an ABI 3730XL at Cosmo Genetech (Seoul, Korea).…”

Section: Methodsmentioning

confidence: 99%

“…While recent studies using a molecular clock approach infer much earlier times (Eocene to Miocene) for divergence of Korean endemic freshwater fishes, including C. splendidus Zhao et al 2015), I. koreensis (Slechtova et al 2008;Kim et al 2013) and K. rotundicaudata (Slechtova et al 2008;, the stream capture hypotheses of Choi (1973Choi ( , 1991 between the Osip and Han or Nakdong Rivers have not been tested rigorously. Kim (2009) investigated genetic population structure of C. splendidus and C. aeruginos and documented little genetic divergence between populations of C. splendidus in the Osip River (East Sea slope) and the Han River (Yellow Sea slope) drainages, providing some support on the hypothesized ichthyofaunal transfer from the Han to Osip Rivers.…”

Section: Introductionmentioning

confidence: 99%

Small fishes crossed a large mountain range: Quaternary stream capture events and freshwater fishes on both sides of the Taebaek Mountains

Kim

Hirt

Won

et al. 2017

Integrative Zoology

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The Taebaek Mountains in Korea serve as the most apparent biogeographic barrier for Korean freshwater fishes, resulting in 2 distinct ichthyofaunal assemblages on the eastern (East/Japan Sea slope) and western (Yellow Sea and Korea Strait slopes) sides of the mountain range. Of nearly 100 species of native primary freshwater fishes in Korea, only 18 species occur naturally on both sides of the mountain range. Interestingly, there are 5 rheophilic species (Phoxinus phoxinus, Coreoleuciscus splendidus, Ladislavia taczanowskii, Iksookimia koreensis and Koreocobitis rotundicaudata) found on both sides of the Taebaek Mountains that are geographically restricted to the Osip River (and several neighboring rivers, for L. taczanowskii and I. koreensis) on the eastern side of the mountain range. The Osip River and its neighboring rivers also shared a rheophilic freshwater fish, Liobagrus mediadiposalis, with the Nakdong River on the western side of the mountain range. We assessed historical biogeographic hypotheses on the presence of these rheophilic fishes, utilizing DNA sequence data from the mitochondrial cytochrome b gene. Results of our divergence time estimation indicate that ichthyofaunal transfers into the Osip River (and several neighboring rivers in East Sea slope) have occurred from the Han (Yellow Sea slope) and Nakdong (Korea Strait slope) Rivers since the Late Pleistocene. The inferred divergence times for the ichthyofaunal transfer across the Taebaek Mountains were consistent with the timing of hypothesized multiple reactivations of the Osip River Fault (Late Pleistocene), suggesting that the Osip River Fault reactivations may have caused stream capture events, followed by ichthyofaunal transfer, not only between the Osip and Nakdong Rivers, but also between the Osip and Han Rivers.

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Unraveling Community Potential Interactions by Environmental DNA in the Hong Kong Coastal Waters

Lee,

Xu,

et al. 2024

Environmental DNA

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Traditional approaches for studying potential interactions in marine ecosystems often struggle to fully capture all taxa in a community, especially rare species. This issue is particularly challenging in coastal waters with high biodiversity and spatiotemporal dynamics. In this study, we employed environmental DNA (eDNA) metabarcoding, utilizing multiple marker genes, to comprehensively investigate interspecific interactions across various domains in the subtropical coastal waters of Hong Kong. The southern and eastern regions of Hong Kong waters exhibit distinct environmental seasonality, and our investigation focused on comparing the potential interaction networks and the keystone taxa between these two regions. The putative species interaction networks across various groups (i.e., bacteria, protists, and metazoans) were revealed by using weighted correlation network analysis (WGCNA). Our results showed that primary consumers, mainly dinoflagellates and ciliates, were the dominant actors within the interaction networks, although their distributions varied between the two regions. Bacterial taxa from the Pseudomonadota groups primarily constituted saprobes in the southern region, while exhibiting an even distribution in the eastern region. The interaction network in the southern region was larger but less stable compared to the eastern region. This could be attributed to the stronger responses of keystone taxa to environmental variations and the relatively higher number of connectors (e.g., Akashiwo and Protoperidinium within Dinophyceae) in the eastern region. Our findings highlight the versatility of eDNA metabarcoding for studying potential species interactions, providing critical insights into ecosystem structure and stability, and offering suggestions for marine biodiversity conservation.

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High genetic diversity within the morphologically conservative dwarf loach, Kichulchoia brevifasciata (Teleostei: Cobitidae), an endangered freshwater fish from South Korea

Cited by 11 publications

References 37 publications

Genomic replacement of nativeCobitis lutheriwith introducedC. tetralineatathrough a hybrid swarm following the artificial connection of river systems

Genomic replacement of nativeCobitis lutheriwith introducedC. tetralineatathrough a hybrid swarm following the artificial connection of river systems

Small fishes crossed a large mountain range: Quaternary stream capture events and freshwater fishes on both sides of the Taebaek Mountains

Unraveling Community Potential Interactions by Environmental DNA in the Hong Kong Coastal Waters

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