Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

The diet and trophic positions of translocated, sympatric populations of Cherax destructor and Cherax cainii in the Hutt River, Western Australia: evidence of resource overlap

Stephen J. Beatty

Centre for Fish and Fisheries Research, School of Biological Sciences, Murdoch University, Murdoch, WA 6150, Australia. Email: s.beatty@murdoch.edu.au

Marine and Freshwater Research 57(8) 825-835 http://dx.doi.org/10.1071/MF05221
Submitted: 7 November 2005  Accepted: 6 October 2006   Published: 28 November 2006

Abstract

This study tested the hypothesis that the introduced yabbie Cherax destructor Clark, 1936 has the potential to compete with the endemic marron Cherax cainii Austin, 2002 for food resources. Multiple stable isotope analyses were conducted in the Hutt River, Western Australia, in summer (December) and winter (July), 2003. Summer samples indicated that these species occupied similar predatory trophic positions when their assimilated diet consisted of a large proportion of Gambusia holbrooki. Although C. cainii continued to assimilate mostly animal matter based on winter signatures, those of C. destructor appeared to shift towards a more herbivorous trophic position. The study suggests that C. destructor and C. cainii may be keystone species in the Hutt River, possibly altering the cycling of nutrients and structure of the aquatic food web since their introduction into this system. The ecological implications of the continued invasion of C. destructor into the aquatic systems of south-western Australia, particularly with regard to competition with the other endemic freshwater crayfishes, are discussed.

Additional keywords: competition, functional omnivores, keystone species, multiple stable isotope analyses, trophic predators.


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