2025-03-12 国立遺伝学研究所
<関連情報>
- https://www.nig.ac.jp/nig/ja/2025/03/research-highlights_ja/rh20250305.html
- https://link.springer.com/article/10.1007/s10228-025-01021-2
トゲウオの個体群間における体長と体深度の発達的軌跡の相違 Divergent developmental trajectories of body depth and head length among stickleback populations
Hiyu Kanbe,Seiichi Mori & Jun Kitano
Ichthyological Research Published:05 March 2025
DOI:https://doi.org/10.1007/s10228-025-01021-2
Abstract
The Threespine Stickleback (Gasterosteus aculeatus) exhibits remarkable morphological diversity among populations. Nevertheless, the majority of previous studies have investigated morphological variation at the adult stage, and less is known about the variation in ontogenetic morphological changes. In the present study, we investigated the developmental changes in body depth and head length in divergent populations of the Japanese Threespine Stickleback as well as the closely related species, the Japan Sea Stickleback (Gasterosteus nipponicus). Our research revealed a trend that sticklebacks that utilize estuarine or marine habitats exhibit ontogenetic changes in the growth rate of body depth and head length relative to standard length, with their growth rates increasing at a later developmental stage. In contrast, freshwater-resident populations showed little ontogenetic change in allometry. These results demonstrate that closely related species and even populations within a species can exhibit divergent developmental patterns with respect to morphological allometry.
