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A hybrid zone and bidirectional introgression between two catadromous species: Australian bass Macquaria novemaculeata and estuary perch Macquaria colonorum

Citation

Shaddick, K and Burridge, CP and Jerry, DR and Schwartz, TS and Truong, K and Gilligan, DM and Beheregaray, LB, A hybrid zone and bidirectional introgression between two catadromous species: Australian bass Macquaria novemaculeata and estuary perch Macquaria colonorum, Journal of Fish Biology, 79, (5) pp. 1214-1235. ISSN 0022-1112 (2011) [Refereed Article]


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The definitive published version is available online at: http://www3.interscience.wiley.com/

DOI: doi:10.1111/j.1095-8649.2011.03105.x

Abstract

The presence and distribution of hybrid individuals and the existence of a hybrid zone between the catadromous Australian bass Macquaria novemaculeata and estuary perch Macquaria colonorum were investigated throughout the range of both species in Australia. Bayesian analyses and genotypic simulations identified 140 putative hybrids (11 5% of the total sample) with varying levels of introgression. Most hybrids were observed in an area extending from the Snowy River to the Albert River suggesting a hybrid zone in the eastern Bass Strait region. Sixteen hybrids, however, were found outside this zone, possibly reflecting the movement of hybrid offspring between estuaries or their inadvertent release during fish stocking programmes. Biparental backcrossing was found to occur suggesting that hybrids were fertile. These results have implications for the management of the extensive stocking programme in M. novemaculeata and for understanding the potential role of habitat degradation and reduced water flow in facilitating hybridization in species with migratory life histories.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Burridge, CP (Dr Christopher Burridge)
ID Code:73922
Year Published:2011
Web of Science® Times Cited:7
Deposited By:Zoology
Deposited On:2011-10-28
Last Modified:2017-11-01
Downloads:2 View Download Statistics

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