Diet of the Ryukyu-ayu <i>Plecoglossus altivelis ryukyuensis</i> in subtropical rivers of Amami-oshima Island, southern Japan revealed by gut content analysis and inferred from stable isotope signatures
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- Nakano Yutaka
- 鹿児島大学水産学部
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- Kobari Toru
- 鹿児島大学水産学部
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- Yamaguchi Atsuko
- 長崎大学水産学部
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- Kume Gen
- 鹿児島大学水産学部
Bibliographic Information
- Other Title
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- 奄美大島におけるリュウキュウアユの食性
- アマミ オオシマ ニ オケル リュウキュウアユ ノ ショクセイ
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Abstract
<p>The diet of the critically endangered Ryukyu-ayu Plecoglossus altivelis ryukyuensis in the middle reaches of the Kawauchi, Sumiyo, and Yakugachi Rivers, Amami-oshima Island, southern Japan was examined by gut content analysis and inferred from stable isotope signatures. No clear differences in diet composition were apparent among the rivers. Microalgae, such as diatoms and cyanobacteria, generally considered as important food, were only rarely observed in gut contents, whereas detritus was almost exclusively found. However, stable isotope signatures indicated that detritus was not directly utilized as a nutritional source, indicating that food availability was an issue for P. a.ryukyuensis.</p>
Journal
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- Japanese Journal of Ichthyology
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Japanese Journal of Ichthyology 67 (2), 287-292, 2020-11-05
The Ichthyological Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1391130851449600384
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- NII Article ID
- 130007939408
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- NII Book ID
- AN00063212
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- ISSN
- 18847374
- 00215090
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- NDL BIB ID
- 030774835
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed