Biogeographic influences on the evolution and historical dispersal of the Australo‐Pacific Dacini fruit flies (Tephritidae: Dacinae)

Author:

Starkie Melissa L.1ORCID,Cameron Stephen L.2,Krosch Matt N.3,Sweet Andrew D.4,Clarke Anthony R.5

Affiliation:

1. Biosecurity Queensland, Department of Agriculture and Fisheries Brisbane Queensland Australia

2. Department of Entomology Purdue University West Lafayette Indiana USA

3. Forensic Services Group Queensland Police Service Brisbane Queensland Australia

4. Department of Biological Sciences Arkansas State University Jonesboro Arkansas USA

5. School of Biology and Environmental Science Queensland University of Technology Brisbane Queensland Australia

Abstract

AbstractFruit flies (Tephritidae: Dacini) are a frugivorous insect group that exhibit high endemic diversity in the rainforests of Australia and the western Pacific. In this region, biogeography has been influenced by tectonic plate movements and cycles of isolation and re‐connection of landmasses and rainforest habitats during glacial periods. However, how such factors have influenced the speciation and historical dispersal of the regional Dacini is largely unknown. To address this, we use a dated phylogeny to reconstruct the biogeographical history of the tribe. We found the Dacini radiated eastward into the Pacific islands largely from sources in New Guinea. We also found evidence for historical dispersal from both Australia and New Guinea into New Caledonia, a pathway unique to this island compared with neighbouring islands. There was also evidence for multiple, bidirectional dispersal events between Papua New Guinea and Australia, likely facilitated by the cyclically exposed Torres Strait land bridge. Cape York in far northern Australia was likely the only entry point for species dispersing into Australia; there was no evidence for entry of flies into Australia directly from West Papua or Wallacea. Several lineages radiated after entering Australia, such as members of the Bactrocera dorsalis species group. Within Australia, speciation was not associated with the biogeographic barriers known to have impacted other rainforest fauna in eastern Australia. Overall, we demonstrate that isolation between islands and large landmasses is important in the evolution of the Australo‐Pacific Dacini, but the reason for their extensive radiation within Australia and Papua New Guinea remains unclear.

Funder

Australian Biological Resources Study

Australian Research Council

Publisher

Wiley

Subject

Genetics,Molecular Biology,Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

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