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New Guinean orogenic dynamics and biota evolution revealed using a custom geospatial analysis pipeline.

Emmanuel F A Toussaint1, Lloyd T White2, Helena Shaverdo3

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BMC Ecology and Evolution
|April 7, 2021
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Summary

New Guinea

Keywords:
Beetle evolutionDytiscidae paleogeographyFoja Gauttier MountainsIsland biogeographyMelanesiaUltramafic rocksWater beetle phylogenetics

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Area of Science:

  • Evolutionary Biology
  • Biogeography
  • Geology

Background:

  • New Guinea's unique biota evolved due to plate tectonics, climate, and sea-level changes.
  • Its location at the junction of Australian and Pacific plates is key to its endemic biodiversity.
  • Molecular phylogenetics and geological data are revitalizing the study of New Guinean biogeography.

Purpose of the Study:

  • To reconstruct the evolutionary history of endemic diving beetles in New Guinea.
  • To test hypotheses about the drivers of biodiversity in the region.
  • To correlate phylogenetic data with geological and geographical information.

Main Methods:

  • Inferred a dated molecular phylogeny for endemic diving beetles.
  • Utilized geospatial analysis to compare phylogenetic data with geological maps and species ranges.
  • Performed geographic and geological ancestral state reconstructions.

Main Results:

  • Diving beetle diversification began in the mid-Miocene (ca. 17 Ma), coinciding with early New Guinean orogeny.
  • Ancestors likely originated in the eastern New Guinean central range on Australian Plate-affinity rocks.
  • Evidence suggests limited back-and-forth colonization between amalgamated terranes, not migration from Pacific terranes.
  • Diversification rates appear to have continuously slowed, rather than being heterogeneous.

Conclusions:

  • Geospatial analysis links New Guinea's biota evolution to its geology.
  • This approach illuminates diversification patterns in this highly diverse region.
  • The study provides new insights into the interplay of geological and biological evolution in New Guinea.