Heterochronic differences in fin development between latitudinal populations of the medaka Oryzias latipes (Actinopterygii: Adrianichthyidae)

Maiko Kawajiri, Tomoyuki Kokita, Kazunori Yamahira

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

Heterochrony is believed to have played important roles in macroevolutionary morphological changes. However, few studies have focused on intraspecific heterochrony, although interspecific differences ultimately originated from variation within ancestral species. We have demonstrated heterochrony in fin development between two latitudinal populations of the medaka, Oryzias latipes. Comparisons of fin length (anal and dorsal) among wild individuals revealed that fins are shorter with respect to body length in the northern population, indicating that they are 'paedomorphic' compared with the southern population. Observations of fin ray formation and subsequent fin growth in the laboratory revealed that the timing of pterygiophore development occurs later, and that fins start to elongate later with respect to body length in the northern fish, indicating that fin growth is 'post-displaced' compared with the southern population. In addition, the rate of fin growth with respect to body length was lower in the northern males, indicating 'neoteny'. Given that all Oryzias except O. latipes are distributed in the tropics, it is likely that higher-latitude fish have evolved post-displacement and neoteny during northern extension of their geographic range. The delayed development in higher-latitude fish is probably a trade-off for faster body growth, which has evolved as an adaptation to seasonally time-constrained environments.

本文言語英語
ページ(範囲)571-580
ページ数10
ジャーナルBiological Journal of the Linnean Society
97
3
DOI
出版ステータス出版済み - 7 2009
外部発表はい

All Science Journal Classification (ASJC) codes

  • 生態、進化、行動および分類学

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