Size-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus)
Abstract Size-related changes in reproductive potential are essential for understanding population dynamics and life history strategies; however, the mechanisms driving variation between individuals and sexes remain unclear. Using a diet-switch experiment and carbon and nitrogen stable isotope ratio...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-04-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-025-99911-y |
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| author | Michio Yoneda Satoshi Katayama Masayuki Yamamoto Naoaki Kono Tatsuo Tsuzaki Hiroshige Tanaka |
| author_facet | Michio Yoneda Satoshi Katayama Masayuki Yamamoto Naoaki Kono Tatsuo Tsuzaki Hiroshige Tanaka |
| author_sort | Michio Yoneda |
| collection | DOAJ |
| description | Abstract Size-related changes in reproductive potential are essential for understanding population dynamics and life history strategies; however, the mechanisms driving variation between individuals and sexes remain unclear. Using a diet-switch experiment and carbon and nitrogen stable isotope ratios (SIRs) as quantitative indicators, we investigated how large (parents) and small (offspring) spawning male and female Japanese anchovies (Engraulis japonicus) allocate energy to reproduction. Large individuals of both sexes exhibited higher energy investment in gamete production than small individuals, reflecting a trade-off between growth and reproduction. The turnover rates of SIRs after a diet switch suggest that anchovies predominantly rely on income breeding. However, significant differences in turnover rates between large and small individuals indicate that large fish can also utilize facultative capital resources for gamete production. Notably, males exhibited slower isotopic turnover than females, partly due to the influence of sperm storage. These findings demonstrate that spawning individuals display temporal diversity in resource use for reproduction, with large individuals showing greater flexibility in energy allocation strategies. This study advances our understanding of size- and sex-dependent resource allocation in Japanese anchovy and contributes to a broader understanding of reproductive strategies in small pelagic fishes. |
| format | Article |
| id | doaj-art-809e94939a634d8cbe2270bfa06bf981 |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-809e94939a634d8cbe2270bfa06bf9812025-08-20T02:11:09ZengNature PortfolioScientific Reports2045-23222025-04-0115111310.1038/s41598-025-99911-ySize-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus)Michio Yoneda0Satoshi Katayama1Masayuki Yamamoto2Naoaki Kono3Tatsuo Tsuzaki4Hiroshige Tanaka5Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Hakatajima Filed StationGraduate School of Agricultural Science, Tohoku UniversityKagawa Prefectural Fisheries Experimental StationFisheries Resources Institute, Japan Fisheries Research and Education Agency, Hatsukaichi Field StationFisheries Technology Institute, Japan Fisheries Research and Education Agency, Hakatajima Filed StationKushiro Laboratory, Hokkaido National Fisheries Research Institute, Fisheries Research AgencyAbstract Size-related changes in reproductive potential are essential for understanding population dynamics and life history strategies; however, the mechanisms driving variation between individuals and sexes remain unclear. Using a diet-switch experiment and carbon and nitrogen stable isotope ratios (SIRs) as quantitative indicators, we investigated how large (parents) and small (offspring) spawning male and female Japanese anchovies (Engraulis japonicus) allocate energy to reproduction. Large individuals of both sexes exhibited higher energy investment in gamete production than small individuals, reflecting a trade-off between growth and reproduction. The turnover rates of SIRs after a diet switch suggest that anchovies predominantly rely on income breeding. However, significant differences in turnover rates between large and small individuals indicate that large fish can also utilize facultative capital resources for gamete production. Notably, males exhibited slower isotopic turnover than females, partly due to the influence of sperm storage. These findings demonstrate that spawning individuals display temporal diversity in resource use for reproduction, with large individuals showing greater flexibility in energy allocation strategies. This study advances our understanding of size- and sex-dependent resource allocation in Japanese anchovy and contributes to a broader understanding of reproductive strategies in small pelagic fishes.https://doi.org/10.1038/s41598-025-99911-y |
| spellingShingle | Michio Yoneda Satoshi Katayama Masayuki Yamamoto Naoaki Kono Tatsuo Tsuzaki Hiroshige Tanaka Size-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus) Scientific Reports |
| title | Size-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus) |
| title_full | Size-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus) |
| title_fullStr | Size-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus) |
| title_full_unstemmed | Size-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus) |
| title_short | Size-dependent resource allocation to reproduction in Japanese anchovies (Engraulis japonicus) |
| title_sort | size dependent resource allocation to reproduction in japanese anchovies engraulis japonicus |
| url | https://doi.org/10.1038/s41598-025-99911-y |
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