MITOCHONDRIAL DNA VARIATION WITHIN AND BETWEEN SPECIES OF THE PAPILIO MACHAON GROUP OF SWALLOWTAIL BUTTERFLIES

Area of Science:

• Evolutionary Biology
• Genetics
• Zoology

Background:

• The Papilio machaon species group exhibits complex evolutionary patterns, including range fragmentation, hybridization, and ecological speciation during the Pleistocene.
• Understanding species limits and phylogenetic relationships is challenging due to these intricate evolutionary processes.

Purpose of the Study:

• To define genetic affinities and population structure within the Papilio machaon species group using mitochondrial DNA (mtDNA).
• To assess the congruence between genetic data, existing species delineations, and ecological races.

Main Methods:

• Mitochondrial DNA (mtDNA) restriction-site analysis was employed to investigate genetic relationships.
• Haplotype distribution was analyzed to infer phylogenetic hypotheses and population structure.

Main Results:

• mtDNA haplotype distribution largely supported previous phylogenetic hypotheses and species boundaries.
• A poor correlation was observed between ecological races and mtDNA haplotypes, indicating independent evolutionary trajectories.
• Species like P. joanae and P. brevicauda, despite wing pattern similarities to P. polyxenes, possess mtDNA closely related to P. machaon.

Conclusions:

• mtDNA analysis provides valuable insights into the genetic structure and evolutionary history of the Papilio machaon species group.
• The findings suggest that P. joanae and P. brevicauda may have a hybrid origin, challenging simple species delineations based on morphology alone.
• Variation in mtDNA sequence divergence reflects differing gene flow and historical population dynamics among species.