Influences of habitat fragmentation by damming on the genetic structure of masu salmon populations in Hokkaido, Japan

Kumano, Shigeru; Yamamoto, Toshiaki; Edo, Kaneaki; Higashi, Seigo

doi:10.1007/s10592-012-0349-7

Cited by 17 publications

(6 citation statements)

References 37 publications

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“…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: Discussionmentioning

confidence: 99%

Section: Phylogeographic History and Genetic Relationships Among Thmentioning

confidence: 99%

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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“…Masu salmon are anadromous, with most females migrating to sea (Morita, 2018b). In the case of large reservoirs (e.g., Lake Shumarinai), dam impoundment may act like a sea and masu salmon populations can persist (Kitanishi et al, 2012). However, in the Hekirichi River, masu salmon became locally extinct because of damming.…”

Section: Non‐native Species Thrive and Native Species Declinementioning

confidence: 99%

Ups and downs of non‐native and native stream‐dwelling salmonids: Lessons from two contrasting rivers

Morita

2022

Ecological Research

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Freshwater rivers and lakes are particularly vulnerable to anthropogenic disturbance because of their proximity to human occupation. Anthropogenic impacts in fresh water include those caused by dams, water pollution, channelization, and invasive species. One common action to conserve freshwater biodiversity involves supplementing or reintroducing extirpated species, though the benefits of these efforts are controversial. Installation of fishways to dams and removal of invasive alien species has also resulted in recovery of native species. Herein results of long‐term monitoring of salmonids in two rivers in Japan are presented. The first case involves a river above a dam where native white‐spotted charr Salvelinus leucomaenis and masu salmon Oncorhynchus masou declined rapidly in number following dam construction, where non‐native rainbow trout Oncorhynchus mykiss and brown trout Salmo trutta increased in number, and where stocking of native masu salmon was unsuccessful. The second case involves a river formerly dominated by non‐native rainbow trout, in which native Dolly Varden charr Salvelinus curilus and masu salmon increased in numbers following removal of non‐native species and fishway installation. Results reveal natural recovery of masu salmon in a river within which they were once completely extirpated, without stocking. Because salmonids are migratory fish and return to natal rivers, when locally extinct, human intervention to stock or reintroduce them has often been deemed necessary. However, restoration of wildlife would not require stocking or reintroduction if factors that impede the self‐recovery capability of species are removed.

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“…Reduction in agricultural productivity [114] Food production Obstructed fish migration [123] Species diversity Aquatic food webs [86,124] Species diversity Aquatic breeding habitats [125][126][127] Reach scale…”

Section: Modification Types Eco-hydro-geomorphological Changes Ecosysmentioning

confidence: 99%

Anthropogenic Modifications and River Ecosystem Services: A Landscape Perspective

Ekka

Pande

Jiang

et al. 2020

Water

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The process of development has led to the modification of river landscapes. This has created imbalances between ecological, economic, and socio-cultural uses of ecosystem services (ESs), threatening the biotic and social integrity of rivers. Anthropogenic modifications influence river landscapes on multiple scales, which impact river-flow regimes and thus the production of river ESs. Despite progress in developing approaches for the valuation ecosystem goods and services, the ecosystem service research fails to acknowledge the biophysical structure of river landscape where ecosystem services are generated. Therefore, the purpose of this review is to synthesize the literature to develop the understanding of the biocomplexity of river landscapes and its importance in ecosystem service research. The review is limited to anthropogenic modifications from catchment to reach scale which includes inter-basin water transfer, change in land-use pattern, sub-surface modifications, groundwater abstractions, stream channelization, dams, and sand mining. Using 86 studies, the paper demonstrates that river ESs largely depend on the effective functioning of biophysical processes, which are linked with the geomorphological, ecological, and hydrological characteristics of river landscapes. Further, the ESs are linked with the economic, ecological, and socio-cultural aspect. The papers show that almost all anthropogenic modifications have positive impact on economic value of ESs. The ecological and socio-cultural values are negatively impacted by anthropogenic modifications such as dams, inter-basin water transfer, change in land-use pattern, and sand mining. The socio-cultural impact of ground-water abstraction and sub-surface modifications are not found in the literature examined here. Further, the ecological and socio-cultural aspects of ecosystem services from stakeholders’ perspective are discussed. We advocate for linking ecosystem service assessment with landscape signatures considering the socio-ecological interactions.

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Influences of habitat fragmentation by damming on the genetic structure of masu salmon populations in Hokkaido, Japan

Cited by 17 publications

References 37 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

Ups and downs of non‐native and native stream‐dwelling salmonids: Lessons from two contrasting rivers

Anthropogenic Modifications and River Ecosystem Services: A Landscape Perspective

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