Genetic basis for variation in the number of cephalic pores in a hybrid zone between closely related species of goby, Gymnogobius breunigii and Gymnogobius castaneus

Ryo Kakioka, Manabu Kume, Asano Ishikawa, Satoshi Ansai, Takuya K. Hosoki, Yo Y. Yamasaki, Atsushi J. Nagano, Atsushi Toyoda, Jun Kitano

Research output: Contribution to journalArticlepeer-review

Abstract

Populations or species exploiting different habitats can differ in sensory perception as a result of divergent adaptation. In bony fish, the water current is perceived via neuromasts, the end organ of the lateral line system. Although fish in different habitats are known to vary in neuromasts, we know little about the genetic basis for such variation. Here, we investigate the genetic basis for variation in supraorbital neuromasts in a hybrid zone between the Japanese gobies Gymnogobius breunigii and Gymnogobius castaneus. The former has supraorbital canal neuromasts with six cephalic pores, whereas the latter has only superficial neuromasts with no canals or pores in the supraorbital region. Our genomic analysis showed that G. breunigii and G. castaneus occur mainly in the lower and mid/upper reaches, respectively. In a river in northern Japan, hybrids were found at the sites between the habitats of the two species. These hybrids exhibited anomalies of cephalic pores. Using this hybrid zone, we conducted genome-wide association studies and identified one locus significantly associated with the number of pores. Genomic cline analysis in the hybrid zone demonstrated that this locus exhibited a higher introgression rate compared with the genomic background, indicating the possibility of adaptive introgression.

Original languageEnglish
Pages (from-to)143-154
Number of pages12
JournalBiological Journal of the Linnean Society
Volume133
Issue number1
DOIs
Publication statusPublished - 2021 May 1
Externally publishedYes

Keywords

  • canal
  • genome-wide association study
  • lateral line
  • mechanosensory
  • neuromast
  • RAD-seq
  • speciation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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