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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41116

Title: Reproductive traits of bluegill Lepomis macrochirus sourced from upstream and downstream areas in a small river in western Japan
Authors: Kao, Shuh-Ji
Yamamoto, Yoshimasa
Shiah, Fuh-Kwo
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: river
bluegill
gonadosomatic index
stable isotope analysis
upstream
downstream
Date: 2013-06
Issue Date: 2017-02-08T08:24:26Z
Publisher: Marine and Freshwater Behaviour and Physiology
Abstract: Abstract: The reproductive traits of bluegill Lepomis macrochirus in the Otsumo River, a small river in western Japan, were investigated by measuring gonad sizes (gonadosomatic index (GSI)) during the pre-spawning season. The bluegill population in the river was divided into two groups based on the water flows in their habitats. Fish that inhabited the lotic upstream area exhibited significantly higher δ 13C values than those in the lentic downstream area. The δ 15N values of females in the upstream area significantly exceeded those in the downstream area, whereas those of males did not differ significantly between the two areas. Females in the downstream area had significantly larger ovaries than those in the upstream area. Males exhibited no such difference in gonad size between the areas. Possible reasons for the differences in carbon sources, gonad sizes, and GSI between the two areas are discussed.
Relation: 46(3)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41116
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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