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The importance of long-distance dispersal and establishment events in small insects : Historical biogeography of metalmark moths (Lepidoptera, Choreutidae)

Författare:
  • Jadranka Rota
  • Carlos Peña
  • Scott E. Miller
Publiceringsår: 2016-06-01
Språk: Engelska
Sidor: 1254-1265
Publikation/Tidskrift/Serie: Journal of Biogeography
Volym: 43
Nummer: 6
Dokumenttyp: Artikel i tidskrift
Förlag: Wiley-Blackwell

Abstract english

Aim: To determine the importance of different biogeographical processes (vicariance, dispersal, long-distance dispersal and establishment or LDDE) for the current distribution of metalmark moths, a group of small insects, using a time-calibrated molecular tree. Location: Global. Methods: We sampled 104 species of metalmark moths with representatives from all six major biogeographical regions of the world (Afrotropical, Australasian, Neotropical, Nearctic, Oriental and Palaearctic). The taxon sampling includes c. 20% of known species in the family and covers both subfamilies. Using an eight-locus molecular data set and secondary calibration points, we inferred a time-calibrated tree, which was then used for ancestral range estimation with variants of the dispersal-extinction-cladogenesis model (DEC), some of which incorporated the founder-event j-parameter for modelling of LDDEs (DECj). Results: The inferred phylogeny is well resolved and in accordance with earlier works. The metalmark moth distribution is best explained with DECj models. It remains unclear what the ancestral area was. Different models differ in the number and type of events estimated - DEC models infer vicariance for several nodes where DECj models usually infer LDDEs. However, the pattern that emerges from all the analyses is that dispersal and/or LDDE over transoceanic distances such as between the Afrotropics and Australasia and the Afrotropics and Neotropics occurred several times in the evolutionary history of this group. Main conclusions: Vicariance may have played an important role in the early evolution of metalmark moths, while dispersal and LDDEs mostly shaped the group's distribution later on. Based on insect flight research using aerial radars, the best mechanism for explaining how small insects cross oceans is by being adapted for exploiting atmospheric conditions as opposed to employing active flight.

Keywords

  • Zoology
  • Founder-event dispersal
  • Insect flight
  • Insect migration
  • Microlepidoptera
  • Oceanic islands
  • Vicariance

Other

Published
  • ISSN: 0305-0270
Jadranka Rota
E-post: jadranka [dot] rota [at] biol [dot] lu [dot] se

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