An alpine grasshopper radiation older than the mountains, on Kā Tiritiri o te Moana (Southern Alps) of Aotearoa (New Zealand)

Molecular Phylogenetics and Evolution
Emily M KootSteven A Trewick

Abstract

In New Zealand, 13 flightless species of endemic grasshopper are associated with alpine habitats and freeze tolerance. We examined the phylogenetic relationships of the New Zealand species and a subset of Australian alpine grasshoppers using DNA sequences from the entire mitochondrial genome, nuclear 45S rRNA and Histone H3 and H4 loci. Within our sampling, the New Zealand alpine taxa are monophyletic and sister to a pair of alpine Tasmanian grasshoppers. We used six Orthopteran fossils to calibrate a molecular clock analysis to infer that the most recent common ancestor of New Zealand and Tasmanian grasshoppers existed about 20 million years ago, before alpine habitat was available in New Zealand. We inferred a radiation of New Zealand grasshoppers ~13-15 Mya, suggesting alpine species diversification occurred in New Zealand well before the Southern Alps were formed by the mountain building events of the Kaikoura Orogeny 2-5 Mya. This would suggest that either the ancestors of today's New Zealand grasshoppers were not dependent on living in the alpine zone, or they diversified outside of New Zealand.

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Citations

Jun 7, 2021·Journal of Evolutionary Biology·Mary Morgan-RichardsSteven A Trewick

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