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RESEARCH ARTICLE
Contents Vol 60(6)

Genetic structure and phylogeography of freshwater shrimps (Macrobrachium australiense and Macrobrachium tolmerum): the role of contemporary and historical events

Suman Sharma A B and Jane M. Hughes A
+ Author Affiliations
- Author Affiliations

A Australian Rivers Institute, Griffith University, Nathan Campus, Qld 4111, Australia.

B Corresponding author. Email: ssharma90@hotmail.com

Marine and Freshwater Research 60(6) 541-553 https://doi.org/10.1071/MF07235
Submitted: 3 December 2007  Accepted: 29 December 2008   Published: 19 June 2009

Abstract

Freshwater species are expected to show higher levels of genetic structuring than those inhabiting estuarine or marine environments because it is difficult for freshwater species to move between river systems. Previous genetic studies of freshwater species from coastal streams in south-east Queensland had proposed that several of these streams had a common confluence relatively recently, when sea levels were lower ~10 000 years bp. The present study was undertaken to test this idea using two freshwater shrimp species, Macrobrachium australiense and Macrobrachium tolmerum. In M. australiense, there was a major phylogeographical break in the middle of the Sunshine Coast region that was expected to be homogeneous because these creeks may have had a shared confluence before entering the sea, possibly because of extremely limited dispersal abilities compounded over many generations. In M. tolmerum, there was evidence of a recent population expansion and also some evidence of limited gene flow between sites. This is explained by recent colonisation of the area and limited gene flow between river systems, despite the ability of this species to survive in brackish water conditions. The present study shows that even species that are taxonomically very close and that co-occur in the same habitats can have vastly different population structures.

Additional keywords: allozymes, AMOVA, mitochondrial DNA, nested clade analysis.


Acknowledgements

Several people helped us with fieldwork. However, we particularly acknowledge the help of Mia Hillyer, Tim Page, Ben Cook and James Fawcett in collecting the samples around south-east Queensland. We thank Chris Walsh and an anonymous referee for their useful comments on an earlier version of this manuscript. Funding for the project was provided by the Australian School of Environmental Studies, Griffith University, and the Co-operative Research Centre for Freshwater Ecology.


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