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Indirect evidence of pathogen-associated altered oocyte production in queens of the invasive yellow crazy ant, Anoplolepis gracilipes, in Arnhem Land, Australia

Published online by Cambridge University Press:  18 September 2017

M.D. Cooling ,
B.D. Hoffmann ,
M.A.M. Gruber  and
P.J. Lester
M.D. Cooling*
Affiliation:
School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
B.D. Hoffmann
Affiliation:
CSIRO, Tropical Ecosystems Research Centre, PMB 44, Winnellie, NT 0822, Australia
M.A.M. Gruber
Affiliation:
School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
P.J. Lester
Affiliation:
School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
*
*Author for correspondence: Phone: +1 (778) 872-8328 Fax: +1 (604) 926-1891 E-mail: [email protected]
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Abstract

Anoplolepis gracilipes is one of the six most widespread and pestiferous invasive ant species. Populations of this invader in Arnhem Land, Australia have been observed to decline, but the reasons behind these declines are not known. We investigated if there is evidence of a pathogen that could be responsible for killing ant queens or affecting their reproductive output. We measured queen number per nest, fecundity and fat content of queens from A. gracilipes populations in various stages of decline or expansion. We found no significant difference in any of these variables among populations. However, 23% of queens were found to have melanized nodules, a cellular immune response, in their ovaries and fat bodies. The melanized nodules found in dissected queens are highly likely to indicate the presence of pathogens or parasites capable of infecting A. gracilipes. Queens with nodules had significantly fewer oocytes in their ovaries, but nodule presence was not associated with low ant population abundances. Although the microorganism responsible for the nodules is as yet unidentified, this is the first evidence of the presence of a pathogenic microorganism in the invasive ant A. gracilipes that may be affecting reproduction.

Keywords

invasive speciesmelanized nodulesbiological control
Type
Research Papers
Information
Bulletin of Entomological Research , Volume 108 , Issue 4 , August 2018 , pp. 451 - 460
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Copyright
Copyright © Cambridge University Press 2017 

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