Phylogenetic relationships, origin and historical biogeography of the genusSprattus(Clupeiformes: Clupeidae) Artículo académico uri icon

Abstracto

  • The genusSprattuscomprises five species of marine pelagic fishes distributed worldwide in antitropical, temperate waters. Their distribution suggests an ancient origin during a cold period of the earth’s history. In this study, we evaluated this hypothesis and corroborated the non-monophyly of the genusSprattus, using a phylogenetic approach based on DNA sequences of five mitochondrial genome regions.Sprattus sprattusis more closely related to members of the genusClupeathan to otherSprattusspecies. We also investigated the historical biogeography of the genus, with the phylogenetic tree showing two well-supported clades corresponding to the species distribution in each hemisphere. Time-calibrated phylogenetic analyses showed that an ancient divergence between Northern and Southern Hemispheres occurred at 55.8 MYBP, followed by a diversification in the Oligocene epoch in the Northern Hemisphere clade (33.8 MYBP) and a more recent diversification in the Southern Hemisphere clade (34.2 MYBP). Historical biogeography analyses indicated that the most recent common ancestor (MRCA) likely inhabited the Atlantic Ocean in the Southern Hemisphere. These results suggest that the ancestral population of the MRCA diverged in two populations, one was dispersed to the Northern Hemisphere and the other across the Southern Hemisphere. Given that the Eocene was the warmest epoch since the Paleogene, the ancestral populations would have crossed the tropics through deeper cooler waters, as proposed by the isothermal submergence hypothesis. The non-monophyly confirmed for the genusSprattusindicates that its systematics should be re-evaluated.

autores

  • Canales Aguirre, Cristian Braulio
  • Ritchie, Peter A.
  • Hernández, Sebastián
  • Herrera-Yañez, Victoria
  • Ferrada Fuentes, Sandra
  • Oyarzún, Fernanda X.
  • Hernández, Cristián E.
  • Galleguillos, Ricardo
  • Arratia, Gloria

fecha de publicación

  • 2021

Publicado en

Página inicial

  • e11737

Volumen

  • 9