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Genetic Structure and Population Demography of White-Spotted Charr in the Upstream Watershed of a Large Dam

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Title: Genetic Structure and Population Demography of White-Spotted Charr in the Upstream Watershed of a Large Dam
Authors: Nakajima, Souta Browse this author
Hirota, Shun K. Browse this author
Matsuo, Ayumi Browse this author
Suyama, Yoshihisa Browse this author
Nakamura, Futoshi Browse this author →KAKEN DB
Keywords: fragmentation
habitat degradation
cold-water fish
demographic history
stairway plot
Issue Date: Sep-2020
Publisher: MDPI
Journal Title: Water
Volume: 12
Issue: 9
Start Page: 2406
Publisher DOI: 10.3390/w12092406
Abstract: White-spotted charr(Salvelinus leucomaenis leucomaenis) is an anadromous fish that has been severely harmed by human land-use development, particularly through habitat fragmentation. However, the anthropogenic impacts on populations of this species have not been evaluated, except those on small dammed-off populations. Using multiplexed ISSR genotyping by sequencing, we investigated the genetic structure of white-spotted charr in four tributaries in the upper section of the Kanayama Dam in the Sorachi River, Hokkaido Island, Japan. There were no distinct genetic structures (F-ST= 0.014), probably because some active individuals migrate frequently among tributaries. By model-flexible demographic simulation, historical changes in the effective population size were inferred. The result indicates that the population size has decreased since the end of the last glacial period, with three major population decline events, including recent declines that were probably associated with recent human activities. Nevertheless, populations in the watershed upstream of the Kanayama Dam are still expected to be at low risk of immediate extinction, owing to the large watershed size and the limited number of small check dams. An effective conservation measure for sustaining the white-spotted charr population is to maintain high connectivity between tributaries, such as by providing fishways in check dams during construction.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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