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Title: Causes of the drastic loss of genetic variation in the Critically Endangered Formosa landlocked salmon of Taiwan
Authors: Te-Hua Hsu
Keisuke Takata
Hiroshi Onozato
Jin-Chywan Gwo
Contributors: 國立臺灣海洋大學:水產養殖學系
Keywords: Taiwan
Amplified fragment length polymorphism
Genetic diversity
Date: 2015-06
Issue Date: 2018-09-25
Publisher: 瀕危物種研究 Endangered Species Research
Abstract: Abstract: The use of hatchery-reared fish to replenish existing threatened wild populations has
been shown to reduce or change the natural genetic diversity of the wild populations. In this study,
the genetic diversity of wild Formosa landlocked salmon Oncorhynchus formosanus in its main
habitat of the Chichiawan Stream in Taiwan was examined after a large-scale escape of hatcherycultivated
fish. Approximately 3000 individuals (the descendants of only 5 pairs of wild salmon) escaped
from an old hatchery when Typhoon Ariel breached the hatchery in the fall of 2004. The genetic
diversity of the wild population was extremely low at that time, and declined further between
2004 and 2008 following the escape of hatchery fish. We hypothesize that the decline in genetic diversity
of the wild population was mainly caused by a population bottleneck in 2005, and that genetic
homogeneity since 2005 was caused by breeding of the escaped hatchery fish (which showed
low genetic diversity) that survived the floods of 2004. This supports the possibility that the drastic
decline in genetic diversity between 2004 and 2008 was caused by the genetic effects of the
escaped hatchery fish, and demonstrates the risk of introducing hatchery fish into the wild.
Relation: 27 pp.277-287
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50202
Appears in Collections:[水產養殖學系] 期刊論文

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