Translocation between freshwater catchments has facilitated the spread of tilapia in eastern Australia

Ovenden, J. R., Macbeth, M. G., Pope, L. C., Thuesen, P., Street, R. and Broderick, D. (2015) Translocation between freshwater catchments has facilitated the spread of tilapia in eastern Australia. Biological Invasions, 17 2: 637-650. doi:10.1007/s10530-014-0754-6


 
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Author Ovenden, J. R.
Macbeth, M. G.
Pope, L. C.
Thuesen, P.
Street, R.
Broderick, D.
Title Translocation between freshwater catchments has facilitated the spread of tilapia in eastern Australia
Journal name Biological Invasions   Check publisher's open access policy
ISSN 1387-3547
1573-1464
Publication date 2015-02-01
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s10530-014-0754-6
Volume 17
Issue 2
Start page 637
End page 650
Total pages 14
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Language eng
Formatted abstract
Understanding dispersal routes of invasive species is essential to their control. Tilapiine fish species are archetypal invaders of freshwater habitats. They were first reported from Australia in the 1970s and have spread rapidly. Incursion into Australia’s largest inland catchment, the Murray Darling Basin, may threaten its largely endemic freshwater fauna. Direct (spatial and temporal distribution) and indirect (genetic data from eight microsatellite loci and mitochondrial DNA sequence) information was used to subjectively construct invasion scenarios. Specifically, we tested the expectation that tilapias have been translocated between freshwater catchments presumably as a consequence of their popularity as bait for angling, display in aquariums and for the table. Five cross-catchment translocation events were inferred involving dispersal across distances up to 300 km. Translocation was not rampant, however, as genetic distinctiveness among catchments was observed. Tilapia in eastern Australia had genetic affinities to Oreochromis spirulus, O. hornourum urolepis and O. aureus, beyond their expected affinity to O. mossambicus. Some individuals had admixed genomes suggesting on-going hybridisation between lineages. Other individuals had zero nuclear genetic diversity at eight microsatellite loci demonstrating the tolerance to severe inbreeding. There was evidence of temporal instability in the composition of populations; for example, in an artificial dam in the south (Tingalpa Weir) one genetic lineage appeared to have replaced another over a period of approximately 20 years. Authorities have clear rationale to more strictly enforce regulations that prohibit possession of this species (dead or alive), and a window of opportunity for effective action given that translocation, while occurring, is currently not rife.
Keyword Admixture
Invasion scenario
Low genetic diversity
Microsatellites
Mitochondrial DNA
Mozambique tilapia
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 31 October 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
School of Biomedical Sciences Publications
 
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Created: Tue, 16 Dec 2014, 07:06:16 EST by Dr Lisa Pope on behalf of School of Biological Sciences