Sharp phylogeographic breaks and patterns of genealogical concordance in the brine shrimp Artemia franciscana

Int J Mol Sci. 2009 Dec 18;10(12):5455-70. doi: 10.3390/ijms10125455.

Abstract

Genealogical concordance is a critical overlay of all phylogenetic analyses, irrespective of taxonomic level. To assess such patterns of congruence we have compiled and derived sequence data for two mitochondrial (16S rRNA, COI) and two nuclear (ITS1, p26) markers in 14 American populations of the hypersaline branchiopod Artemia franciscana. Cladistic analysis revealed three reciprocally monophyletic mitochondrial clades. For nuclear DNA, incomplete lineage sorting was evident presumably as a result of slower coalescence or male-mediated dispersal. Our findings capture the genealogical interval between gene splitting and population divergence. In this sense, strong indications are provided in favour of a superspecies status and ongoing speciation in A. franciscana.

Keywords: Andes; coalescence; dispersal; endemism; incipient speciation; mitochondrial DNA; superspecies; zooplankton.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animal Distribution*
  • Animals
  • Artemia / classification*
  • Artemia / genetics*
  • Female
  • Genes, Mitochondrial
  • Genetic Speciation
  • Male
  • Phylogeny*
  • Phylogeography
  • RNA, Ribosomal, 16S / genetics
  • Sex Factors

Substances

  • RNA, Ribosomal, 16S