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RESEARCH ARTICLE

Contrasting and complex evolutionary histories within the terapontid grunter genus Hephaestus revealed by nuclear and mitochondrial genes

Bradley J. Pusey A C , Andrew Bentley B , Damien Burrows A , Colton Perna A , Aaron Davis A and Jane Hughes B
+ Author Affiliations
- Author Affiliations

A Centre for Tropical Water and Aquatic Ecosystem Research (TropWATER), James Cook University, Townsville, Qld 4811, Australia.

B Australian Rivers Institute, Griffith University, Nathan, Qld 4111, Australia.

C Corresponding author. Email: bpusey@westnet.com.au

Marine and Freshwater Research 67(12) 1813-1825 https://doi.org/10.1071/MF15198
Submitted: 21 May 2015  Accepted: 13 November 2015   Published: 12 January 2016

Abstract

Contrasting evolutionary histories may be revealed by mitochondrial and nuclear information. Divergent New Guinean and eastern and western Australian lineages of Hephaestus fuliginosus (sooty grunter) were detected using mitochondrial data, with the extent of divergence consistent with cryptic speciation events. However, this phylogeographic pattern was not supported by nuclear gene data, and evidence for cryptic speciation appears driven almost entirely by introgression between H. fuliginosus and congeners on the periphery of its distribution (e.g. with H. tulliensis, H. jenkinsi or H. roemeri). Hephaestus fuliginosus is a single species with a complex evolutionary history. Introgression on the eastern coast is consistent with transfer of the mitochondrial genome of the resident species (H. tulliensis) to the invading species (H. fuliginosus) and may have provided the metabolic capacity for H. fuliginosus to spread into the cooler rainforest environment of the Wet Tropics region. Mitochondrial and nuclear analyses both identified the genus Hephaestus as polyphyletic with H. carbo and H. habbemai placed in a clade with Leiopotherapon unicolor and Amniataba percoides. The present study demonstrated the need to consider a variety of genetic information when assessing species identity in a widespread species and the need for a systematic revision of the genus and family as a whole.

Additional keywords: introgression, phylogeography, sooty grunter, species complex, Terapontidae.


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