Spatial and temporal changes in genetic structure and diversity of isolated white-spotted charr (Salvelinus leucomaenis) populations

Yamamoto, Shoichiro; Morita, Kentaro; Sahashi, Genki

doi:10.1007/s10750-019-3924-9

Cited by 11 publications

(9 citation statements)

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“…Isolation‐by‐distance population genetic structure was found in the O. m. masou populations, as has frequently been found in other anadromous salmonids (e.g. Bond, Crane, Larson, & Quinn, ; Hansen, Fraser, Meier, & Mensberg, ; Yamamoto, Morita, & Sahashi, ). Most O. m. masou populations exhibit a diverse array of migration strategies, and include migrant and non‐migrant individuals within populations.…”

Section: Discussionsupporting

confidence: 70%

“…Isolation-by-distance population genetic structure was found in the O. m. masou populations, as has frequently been found in other anadromous salmonids (e.g. Bond, Crane, Larson, & Q uinn, 2014;Hansen, Fraser, Meier, & Mensberg, 2009;Yamamoto, Morita, & Sahashi, 2019 showed that characteristic morphological differences between the two subspecies, such as the spotted pattern on the body, have a genetic basis (Kimura, 1982). Given that the morphological differences between the two subspecies originated recently (i.e.…”

Section: Phylogeographic History and Genetic Relationships Among Thsupporting

confidence: 63%

“…However, the genetic integrity and diversity of masu salmon have often been ignored, sometimes resulting in accelerated hybridisation between wild and hatchery fish both within subspecies (Kawamura, Furukawa, Kubota, & Harada, ; Kawamura, Kubota, Furukawa, & Harada, ) and among subspecies (Kitanishi, Mukai, Yamamoto, Tago, & Oda, ; Yamazaki, Shimada, & Tago, ). In addition, habitat fragmentation by artificial damming is frequent in Japanese and Taiwan rivers, resulting in decreased population sizes and reduced genetic diversity of salmonid populations (Kitanishi, Yamamoto, Edo, & Higashi, ; Yamamoto, Kubota, Hasegawa, & Nakamura, ; Yamamoto et al, ). Therefore, managers should adequately consider population‐structure characteristics and diversity when establishing units for conservation and fisheries, so as not to affect genetic integrity.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, habitat fragmentation by artificial damming is frequent in Japanese and Taiwan rivers, resulting in decreased population sizes and reduced genetic diversity of salmonid populations (Kitanishi, Yamamoto, Edo, & Higashi, 2012;Yamamoto, Kubota, Hasegawa, & Nakamura, 2016;Yamamoto et al, 2019). Therefore, managers should adequately consider population-structure characteristics and diversity when establishing units for conservation and fisheries, so as not to affect genetic integrity.…”

Section: Phylogeographic History and Genetic Relationships Among Thmentioning

confidence: 99%

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Phylogeography of a salmonid fish, masu salmon Oncorhynchus masou subspecies‐complex, with disjunct distributions across the temperate northern Pacific

et al. 2019

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Climate oscillations during the Pleistocene had profound effects on the evolutionary history of freshwater fishes now distributed across northern temperate regions. The extent of continental glaciation on the western side of the North Pacific, including areas of East Asia, was more limited as compared with regions of North America, Europe and high‐latitude areas of the North Pacific. Therefore, the effects of climate oscillations might have influenced species in dissimilar ways depending on the species' distribution. We used mitochondrial DNA (mtDNA) and microsatellite DNA (msDNA) markers to clarify the evolutionary history of masu salmon Oncorhynchus masou subspecies‐complex (family Salmonidae) distributed in historically non‐glaciated regions in the western North Pacific. No marked regional or subspecies‐specific mtDNA haplotype associations were recognised, except for O. masou subsp., a lacustrine form endemic to Lake Biwa, an ancient lake in central Honshu. The landlocked subspecies O. masou formosanus, with a disjunct distribution on Taiwan Island, exhibited no diagnostic population features differing from the other subspecies, in either mtDNA or msDNA markers. Mismatch distribution and Bayesian skyline plot analyses indicated relatively recent range expansion and rapid population growth for masu salmon during the last glacial period (c. 0.1–0.15 Ma). Contrary to the mtDNA genealogy, Bayesian clustering using msDNA showed two main genetic clusters, mainly northern populations of the subspecies O. m. masou and populations of the subspecies O. m. ishikawae in southern areas of the Japanese Archipelago. Notably, O. m. formosanus on Taiwan Island was included in the O. m. masou group, and O. masou subsp. was included in the O. m. ishikawae group. Our results suggest that the masu salmon subspecies‐complex in historically non‐glaciated regions of the Temperate Northern Pacific is characterised by weak population structuring and shallow genetic differentiation among the subspecies, except for O. masou subsp. owing to its long isolation in Lake Biwa. Incomplete lineage sorting and historical inter‐subspecies hybridisation, possibly due to secondary contact, seem to be plausible explanations for discrepancies in the mitochondrial DNA genealogy and nuclear DNA genetic structure.

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Section: Discussionsupporting

confidence: 70%

Section: Phylogeographic History and Genetic Relationships Among Thsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Phylogeographic History and Genetic Relationships Among Thmentioning

confidence: 99%

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Phylogeography of a salmonid fish, masu salmon Oncorhynchus masou subspecies‐complex, with disjunct distributions across the temperate northern Pacific

et al. 2019

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“…Different environmental contexts may produce varying degrees of genetic structure, such as an undisturbed site compared to a fragmented landscape (Moore et al, 2011). Although fragmentation can initially increase population densities due to crowding in remnant patches, over time populations tend to decline due to reduced habitat availability, increased edge effects, and limited migration (Fletcher et al, 2018;Haddad et al, 2017), thereby hastening differentiation among demes (Delaney et al, 2010;Yamamoto et al, 2019). The reduction of genetic variability in small, isolated populations, due to drift and lack of gene flow, can limit their adaptive potential (Frankham, 1995;Wade et al, 2017) and increase inbreeding depression, making them vulnerable to environmental and demographic stochasticity (Fagan & Holmes, 2006;Soulé et al, 1986).…”

Section: Introductionmentioning

confidence: 99%

Intact landscape promotes gene flow and low genetic structuring in the threatened Eastern Massasauga Rattlesnake

Kudla

McCluskey

Lulla

et al. 2021

Ecology and Evolution

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How does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?

Özdilek

Partal

Mestav

2022

River Research & Apps

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Most rivers around the Mediterranean region, regardless of size, are interrupted by human induced barriers. Although various studies have been conducted to investigate the impacts of reservoirs on undisrupted freshwater biota, what kind of effects they exert on the distribution of freshwater fish assemblages with respect to the presence of invasive species remains to be answered. To attend to this research need, the Karamenderes River, which is disrupted by the Bayramiç Reservoir, was selected as the research site. Relying on the river continuum concept (RCC), we hypothesized that fish assemblages in a given river would demonstrate a gradual downstream change unless the river is interrupted by any reservoir. The ad hoc unweighted pair group method with arithmetic means (UPGMA) agglomerative hierarchical cluster analyses revealed 11 fish assemblages 100 km down the studied river, which is characterized by four environmental gradients. Besides, co-occurrence network analyses were performed to gain a better understanding of the constructs of the observed fish assemblages. The analyses yielded two distinct clusters along the river and showed that the Bayramiç Reservoir had no decisive part in the spatial clustering of these fish assemblages. The migratory species Anguilla anguilla was found only in and around the river mouth area. The co-occurrence network analyses indicated that the freshwater, estuarine and introduced species were observable in distinct groups. It is notable that the non-native Cyprinus carpio and invasive Carassius gibelio were determined in the native freshwater fish species module. The research evidenced that the reservoir had a triple effect, that is, a migration barrier to migratory fish species, a donor facilitating invasion, and a cause of homogenization of river fish assemblages along the river. The results suggest that the impact of the reservoir should be assessed in view of multiple nested model and fish passageways and controlling invasive species are two contradictory problems as far as the impacts of reservoirs are concerned. Therefore, river management should be performed in a way to allow the native migratory species to migrate freely while preventing the introduced species from moving upstream or downstream to preserve and promote rivers' heterogeneity.

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Spatial and temporal changes in genetic structure and diversity of isolated white-spotted charr (Salvelinus leucomaenis) populations

Cited by 11 publications

References 58 publications

Phylogeography of a salmonid fish, masu salmon Oncorhynchus masou subspecies‐complex, with disjunct distributions across the temperate northern Pacific

Phylogeography of a salmonid fish, masu salmon Oncorhynchus masou subspecies‐complex, with disjunct distributions across the temperate northern Pacific

Intact landscape promotes gene flow and low genetic structuring in the threatened Eastern Massasauga Rattlesnake

How does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?

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