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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47614

Title: 利用穩定性同位素分析探討臺灣北部海域斑竹狗鮫攝食生態
Examining the feeding ecology of the whitespotted bamboo shark, Chiloscyllium plagiosum, in the northern waters off Taiwan by using stable isotope analysis
Authors: Chang, Sheng-Kai
張勝凱
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: 餌料生物;碳同位素;氮同位素;營養位階;生態區位
Prey;δ13C;δ15N;trophic position;ecological niche
Date: 2016
Issue Date: 2018-08-08T03:24:57Z
Abstract: 斑竹狗鮫(Chiloscyllium plagiosum)是臺灣北部海域小型鯊魚中數量最多的種類,在此海域生態系中扮演重要角色。由於其攝食生態資訊完全缺乏,本研究係透過穩定性同位素分析估計斑竹狗鮫之營養位階,並進一步瞭解斑竹狗鮫位於臺灣北部海域之生態區位。本研究於2013年10月至2015年3月間於新北市富基漁港採集78尾斑竹狗鮫樣本(雌魚32尾、雄魚46尾)位於第一背鰭下方之白肌,進行碳、氮同位素(δ(_^13)C、δ(_^15)N)分析。雌魚樣本體長(全長)範圍為41.0至84.0 cm,體重為180至2500 g,雄魚樣本體長範圍為39.0至84.0 cm,體重205至2000 g。同位素分析結果顯示,雌魚δ(_^13)C值介於-17.05~-14.76‰,平均為-15.75‰ ± 0.51‰;δ(_^15)N 介於10.83~13.29‰,平均為12.46‰ ± 0.69‰。雄魚δ(_^13)C值介於-16.90 ~ -14.62‰,平均為-15.83‰ ± 0.44‰;δ(_^15)N範圍為10.95 ~ 14.37‰,平均為12.36‰ ± 0.74‰。經t檢定,雌雄之δ(_^13)C與δ(_^15)N同位素平均值並無顯著差異,而不同成熟階段則有顯著差異。經變方分析(ANOVA)檢定,顯示δ(_^15)N在不同季節有顯著差異,多重比較結果顯示夏季明顯低於其他季節。斑竹狗鮫平均營養位階為4.19;未成熟個體平均營養位階為4.06,成熟個體平均營養位階4.39。雖然斑竹狗鮫在不同成熟階段之δ(_^15)N有顯著差異,但營養位階相差未達一階。比較餌料生物與斑竹狗鮫碳氮同位素值,發現斑竹狗鮫在發育至成熟時,可能有餌料生物轉換的情形。
The whitespotted bamboo shark, Chiloscyllium plagiosum, is the dominant species of small sharks caught in the northern waters off Taiwan and it plays an important role in the marine ecosystem in this region. This study aims to estimate the trophic position and ecological niche of the whitespotted bamboo shark using stable isotope analysis. The white muscle under the first dorsal fin was taken from the 78 specimens (32 females, 46 males) collected at the Fugi fishing port, in New Taipei City from October 2013 to March 2015. These samples were used for stable isotope (δ13C, δ15N) analysis. Female specimens ranged from 41.0 to 84.0 cm TL with a mean ± SD of 64.3 ± 13.5 cm, whereas body weight ranged from 180 - 2500 g (925.8 ± 579.6 g). Male specimens ranged from 39.0 to 84.0 cm TL (mean = 59.4 ± 13.5 cm), while body weight ranged from 205 to 2000 g (mean = 755.0 ± 506.2 g). Stable isotope analyses indicated that δ13C ranged from -17.05 to -14.76‰ with a mean of 5.75‰ ± 0.51‰, and δ15N ranged from 10.83 to 13.29‰ with a mean of 12.46‰ ± 0.69‰, for females. The estimated δ13C ranged from -16.90 to -14.62‰ (mean = -15.83‰ ± 0.44‰), and δ15N ranged from 10.95 to 14.37‰ (mean = 12.36‰ ± 0.74‰) for males. No significant difference was found between sexes for the mean values of δ13C and δ15N with t-test (δ13C: df=76, p=0.437; δ15N: df=76, p=0.559). Significant difference was found between different maturity stage on the mean values of δ13C and δ15N with t-test (δ13C:df=76, p<0.05; δ15N: df=76, p<0.05). The analysis of variance indicated that there is significant difference among seasons on the mean value of δ15N and multiple comparison results indicated that of the second season was lower than those of other seasons. The mean values of δ13C and δ15N increased with the length of the fish. Mean trophic position of whitespotted bamboo sharks for both sexes is 4.19, and are 4.06 and 4.39 for the immature and mature, respectively. It is found that whitespotted bamboo sharks have an ontogenetic shift of diet when they reach mature.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010331003.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47614
Appears in Collections:[環境生物與漁業科學學系] 博碩士論文

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