Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/73634
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Type: Journal article
Title: Trapped in desert springs: phylogeography of Australian desert spring snails
Author: Murphy, N.
Breed, M.
Guzik, M.
Cooper, S.
Austin, A.
Citation: Journal of Biogeography, 2012; 39(9):1573-1582
Publisher: Blackwell Science Ltd
Issue Date: 2012
ISSN: 0305-0270
1365-2699
Statement of
Responsibility: 
Nicholas P. Murphy, Martin F. Breed, Michelle T. Guzik, Steven J.B. Cooper and Andrew D. Austin
Abstract: AIM: We investigate the phylogeographical history and determine the time-scale of population divergence of hydrobiid freshwater snails (genus Trochidrobia) inhabiting groundwater springs in the Australian desert. We test the hypothesis that divergence between geographically distinct snail populations occurred simultaneously due to their isolation in hydrologically discrete spring systems, i.e. ‘trapped in desert springs’. LOCATION: Groundwater springs of the Great Artesian Basin (GAB) in central Australia. METHODS: DNA sequence data from the mitochondrial cytochrome c oxidase subunit I gene and the nuclear 28S and internal transcribed spacer rRNA genes were used to reconstruct phylogenetic relationships within and among three species of Trochidrobia (Hydrobiidae): T. punicea (13 spring groups, n = 90), T. smithi (12 spring groups, n = 62) and T. minuta (2 spring groups, n = 4). Bayesian relaxed molecular clock analyses and approximate Bayesian computation were used to date lineage divergence and distinguish between alternative biogeographical scenarios. RESULTS: The diversification of the three Trochidrobia species probably occurred between 2.54 and 9.3 Ma, prior to the formation of the springs c. 1 Ma. Intraspecific divergences within the two widespread species occurred after the formation and colonization of the springs. Coalescent modelling and molecular clock analyses supported a simultaneous radiation of five allopatric intraspecific snail lineages within T. punicea (two lineages)and T. smithi (three lineages) across the GAB springs examined. MAIN CONCLUSIONS: The analyses support the ‘trapped in desert springs’ hypothesis for the diversification of intraspecific lineages within the species T. punicea and T. smithi. This hypothesis suggests that the formation of deserts around Lake Eyre in the early Pleistocene led to the hydrological isolation of spring complexes in the GAB, resulting in significant molecular divergence, but no morphological divergence, of Trochidrobia snail populations.
Keywords: Australia; aquatic invertebrates; comparative phylogeography; desert springs; freshwater snails; Great Artesian Basin; groundwater; landscape structure; Trochidrobia; Quaternary climate
Rights: © 2012 Blackwell Publishing Ltd.
RMID: 0020121806
DOI: 10.1111/j.1365-2699.2012.02725.x
Grant ID: http://purl.org/au-research/grants/arc/DP0770979
http://purl.org/au-research/grants/arc/LP0669062
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications
Environment Institute publications

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