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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50201

Title: Causes of the skewed sex ratio in the Critically Endangered Formosa landlocked salmon of Taiwan
Authors: Te-Hua Hsu
Chia-Yang Chen
Jin-Chywan Gwo
Contributors: 國立臺灣海洋大學:水產養殖學系
Keywords: Endocrine disruptors
Fish
Reproduction
Habitat
Endangered
Taiwan
Date: 2016-01
Issue Date: 2018-09-25
Publisher: 瀕危物種研究 Endangered Species Research
Abstract: Abstract: The residual estrogenic pollutant alkyl phenols, 4-nonylphenol (NP), 4-tert-octylphenol
(OP), and the sex ratio of Formosa landlocked salmon Oncorhynchus formosanus were surveyed
in the Formosa landlocked salmon ecological reservation area. This species survives as a remnant,
landlocked population in the headwaters of the Chichiawan Stream, a tributary of the Tachia
River of central Taiwan. Dams restrict the movement of fish in and out of the agriculturally influenced
zones. Fish (n = 157) were collected from a total of 9 habitat sites, and the amount of NP
and OP present in each site (ambient water from rearing pools, streams, stream sediments, and
agricultural effluents) was measured and the sex of the fish was determined via a noninvasive
PCR-based method. The results indicate significantly higher NP content and a skewed sex ratio in
Formosa landlocked salmon found in agricultural zones compared to salmon found in non-agricultural
zones. The concentrations and distributions of NP observed in this study are ecologically significant
because they correspond with the skewed sexual ratio and the lower quality and quantity
of male salmon sperm observed in previous field investigations. Although the skewed sex ratios
are likely a reflection of multiple endocrine disrupting compounds rather than simply NP and OP
alone, these results support the contention that exposure of Formosa landlocked salmon to environmentally
persistent estrogenic chemicals can have deleterious reproductive consequences.
Relation: 30 pp.45-52
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50201
Appears in Collections:[水產養殖學系] 期刊論文

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