Population genetic instability and the phylogeography of the mussel Austromytilus rostratus (Dunker, 1857) (Bivalvia: Mytilidae)
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Marine and estuarine species often exhibit patterns of genetic variability consistent with demographic disequilibrium caused by reduced population sizes, possibly associated with glacial cycles. With one exception, previous studies in southeastern Australia have concentrated on taxa with broad distributions for which convincing scenarios to explain range size reductions are generally lacking. This study investigates the genetic structure of the mussel Austromytilus rostratus, which is a limited-range taxon endemic to the region, to examine the role that demographic instability may have played in its phylogeographic history. A. rostratus presently has no marked geographic structure in mitochondrial cytochrome c oxidase subunit I DNA sequences, although it exhibits very high diversity of haplotypes, with many restricted to one of the three regions where the species is particularly abundant. FST values between these regions are low although they are separated by areas of low population density. Sequence mismatch distributions and population genetic statistics suggest that demographic disequilibrium has occurred in A. rostratus overall and within each region. The species may have experienced population size changes, possibly through a decrease in its distribution during climate cycles to southern refugia at glacial minima or to northern refugia at glacial maxima. Under either scenario, however, the operation of indirect factors such as changes in the ranges of predators, interspecific competition or nutrient availability would probably need to be invoked to explain severe reductions in population size.
KeywordsMaugean Province Phylogeography Geographic refugia Glacial cycles
I thank the Australian Museum and the New South Wales Environmental Trust for the financial support, Pam Da Costa for DNA sequencing and three anonymous reviewers for helpful comments on a previous version of this manuscript. Collections for this project were undertaken under Permits F86/2163(A) (New South Wales Fisheries Research Permit), 7118 (Tasmania DPIW permit) and RP972 (Victoria General Research Permit).
This research was funded by the Australian Museum and the New South Wales Environmental Trust (Grant 2008/RD/0071).
Compliance with ethical standards
Conflict of interest
The author declares that he has no conflict of interest.
All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.
Sampling and field studies
All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities and are mentioned in the acknowledgements, if applicable.
- Bureau of Meteorology (2016) Annual SST averages (°C) for 1961–1990. Available at http://www.bomgovau/climate/change/indexshtml#tabs=Tracker&tracker=average–maps. Accessed 2 August, 2016
- Colgan DJ (1980) Theoretical and practical studies on genetic fitness. PhD thesis, University of MelbourneGoogle Scholar
- Colgan DJ (2015) The marine and estuarine phylogeography of the coasts of southeastern Australia. Mar Freshw Res. doi: https://doi.org/10.1071/MF15106
- Colgan DJ, Middelfart P, Golding R, Criscione F (2009) Monitoring the response of NSW bivalves to climate change. Final report to the Environmental Trust for Grant 2008/RD/0071 Australian Museum, SydneyGoogle Scholar
- Excoffier L, Laval G, Schneider S (2005) Arlequin ver 3.0: an integrated software package for population genetics data analysis. Evol Bioinformatics Online 1:47–50Google Scholar
- Folmer O, Black M, Hoeh W, Lutz R, Vrijenhoek R (1994) DNA primers for amplification of mitochondrial cytochrome c oxidase subunit I from diverse metazoan invertebrates. Mol Mar Biol Biotechnol 3:294–299Google Scholar
- Fu Y-X (1996) New statistical tests of neutrality for DNA samples from a population. Genetics 143:557–570Google Scholar
- Garrido-Ramos MA, Stewart DT, Sutherland BW, Zouros E (1998) The distribution of male-transmitted and female-transmitted mitochondrial DNA types in somatic tissues of blue mussels: implications for the operation of doubly uniparental inheritance of mitochondrial DNA. Genome 41:818–824CrossRefGoogle Scholar
- Grove S, de Little R (2013) The coastal marine molluscs of King Island: March 2013 trip report and an updated checklist. Tasmanian Museum and Art Gallery, HobartGoogle Scholar
- Hall TA (1999) BioEdit: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/NT. Nucl Acids Symp Ser 41:95–98Google Scholar
- King RJ (1972) The distribution and zonation of intertidal organisms in Bass Strait. Proc Roy Soc Victoria 85:145–162Google Scholar
- Lamprell K, Healy J (1998) Bivalves of Australia, vol 2. Backhuys Publishers, LeidenGoogle Scholar
- Laseron CF (1956) New South Wales mussels. Aust Zool 12:263–283Google Scholar
- Macpherson JH, Gabriel CJ (1962) Marine molluscs of Victoria. Melbourne University Press, MelbourneGoogle Scholar
- Miller MA, Pfeiffer W, Schwartz T (2010) Creating the CIPRES Science Gateway for inference of large phylogenetic trees, In: Proceedings of the Gateway Computing Environments Workshop (GCE), 14 Nov. 2010, New Orleans, pp. 1–8##Google Scholar
- Miller AD, Versace VL, Matthews TG, Montgomery S, Bowie KC (2013) Ocean currents influence the genetic structure of an intertidal mollusc in southeastern Australia—implications for predicting the movement of passive dispersers across a marine biogeographic barrier. Ecol Evol 3:1248–1261CrossRefGoogle Scholar
- Nürnberg D, Brughmans N, Schönfeld J, Ninnemann U, Dullo C (2004) Paleo-export production, terrigenous flux and sea surface temperatures around Tasmania—implications for glacial/interglacial changes in the subtropical convergence zone in: Exon NF, Kennett JP, Malone MJ (eds) The cenozoic Southern Ocean: tectonics, sedimentation and climate change between Australia and Antarctica. American Geophysical Union, Washington DC, Geophysical Monograph Series 151:291–317Google Scholar
- Ompi M (2011) Settlement behaviour and size of mussel larvae from the family Mytilidae (Brachidontes erosus (Lamarck, 1819), Brachidontes rostratus (Dunker, 1857), Trichomya hirsutus (Lamarck, 1819) and Mytilus galloprovincialis Lamarck, 1819). J Coast Dev 13:215–227Google Scholar
- Skibinski DOE, Gallagher C, Beynon CM (1994) Sex-limited mitochondrial DNA transmission in the marine mussel Mytilus edulis. Genetics 138:801–809Google Scholar
- Swofford DL (2003) PAUP: phylogenetic analysis using parsimony, version 4.0. Laboratory of Molecular Systematics, Smithsonian Institution, WashingtonGoogle Scholar
- Tajima F (1989) Statistical method for testing the neutral mutation hypothesis by DNA polymorphism. Genetics 123:585–595Google Scholar
- Trovant B, Orensanz JL, Ruzzante DE, Stotz W, Basso NG (2015) Scorched mussels (Bivalvia: Mytilidae: Brachidontinae) from the temperate coasts of South America: phylogenetic relationships, trans-Pacific connections and the footprints of Quaternary glaciations. Mol Phylogenet Evol 82:60–74CrossRefGoogle Scholar