Diet of Mass-Stranded Striped Dolphins (Stenella coeruleoalba) in Southern Japan (East China Sea)

IF 0.8 4区生物学 Q3 ZOOLOGY

Mammal Study Pub Date : 2020-12-21 DOI:10.3106/ms2020-0005

Ayaka Matsuda, T. Yamada, Y. Tajima, T. Kunisue, M. Amano, T. Matsuishi

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引用次数: 2

Abstract

Abstract. Striped dolphins (Stenella coeruleoalba) mass-stranded on 26 April 2013 at Minamisatsuma, Kagoshima Prefecture, in southern Japan (East China Sea). The diet of the mass-stranded striped dolphins was investigated to reveal their foraging pattern through analyses of the stomach contents and stable isotopes in muscle. Of 26 stomachs sampled, 25 contained hard parts of prey animals; no fleshy remains were found in any of the stomachs. The identified prey species represented four cephalopod families: Loliginidae, Onychoteuthidae, Histioteuthidae, and Ommastrephidae. Among these, ommastrephids had the highest abundance (42.4%) and frequency of occurrence (69.2%). A chi-square test revealed that the prey species consumed did not significantly differ between male and female dolphins, although deeper-water squids (Onychoteuthidae and Histioteuthidae) appeared only in the stomachs of females. The values of δ13C ranged from –20.4 to –17.0‰ (mean ± SD: –18.2 ± 0.9‰), and values of δ15N ranged from 10.2 to 12.5‰ (10.8 ± 0.5‰), with a significant difference in δ15N between sexes (P < 0.05).

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日本南部（东海）大量搁浅条纹海豚的饮食

摘要2013年4月26日，条纹海豚（Stenella coeruleoalba）在日本南部（东海）鹿儿岛县南三岛大规模搁浅。通过对大量搁浅条纹海豚的胃内容物和肌肉中稳定同位素的分析，研究了它们的饮食，以揭示它们的觅食模式。在取样的26个胃中，有25个含有猎物的坚硬部分；在任何一个胃里都没有发现肉的残骸。已确定的猎物物种代表了四个头足类科：Loligiidae、Onychoteuthidae、Histiotethidae和Ommastrephidae。其中，小龙虾的数量最多（42.4%），出现频率最高（69.2%）。卡方检验显示，雄性和雌性海豚消耗的猎物种类没有显著差异，尽管深水鱿鱼（Onychoteutidae和Histioeuthidae）只出现在雌性的胃里。δ13C值范围为–20.4‰至–17.0‰（平均值±标准差：–18.2±0.9‰），δ15N值范围为10.2‰至12.5‰（10.8±0.5‰），性别间δ15N差异显著（P<0.05）。

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来源期刊

Mammal Study ZOOLOGY-

CiteScore

1.70

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： Mammal Study is the official journal of the Mammal Society of Japan. It publishes original articles, short communications, and reviews on all aspects of mammalogy quarterly, written in English.