Supercolony mosaics: two different invasions by the yellow crazy ant, 'Antoplolepis gracilipes', on Christmas Island, Indian Ocean

Title
Supercolony mosaics: two different invasions by the yellow crazy ant, 'Antoplolepis gracilipes', on Christmas Island, Indian Ocean
Publication Date
2009
Author(s)
Thomas, Melissa L
Becker, Katrin
Abbott, Kirsti
Feldhaar, Heike
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Springer Netherlands
Place of publication
Netherlands
DOI
10.1007/s10530-009-9473-9
UNE publication id
une:15892
Abstract
Invasive species are one of the main reasons for the ongoing global loss of biodiversity. 'Anoplolepis gracilipes' is an invasive ant that has recently received significant attention due to its negative effect on the native fauna and flora of Christmas Island, Indian Ocean. This species has contributed to a drastic change in the structure of the Christmas Island rainforest through its negative impact on the island's endemic red land crab, the dominant consumer on the island's forest floor. In this study, we investigate the population structure of 'A. gracilipes' on Christmas Island in order to determine whether multiple introductions occurred on the island and how they correspond to known infestations. We genotyped 578 individuals collected from 50 nests across the Island. We identify two distinct subgroups in the population that represent two different supercolonies. These supercolonies are interspersed across the island, however both nuclear (microsatellites) and mitochondrial markers strongly suggest that there is no gene flow between the two colonies. Significant heterozygote excess within the entire sampling area, with all but one worker examined being heterozygous for all seven microsatellite loci, suggests an unusual reproductive system in these ants. Our results are consistent with recent sociogenetic findings in a population of 'A. gracilipes' in Northern Borneo.
Link
Citation
Biological Invasions, 12(3), p. 677-687
ISSN
1573-1464
1387-3547
Start page
677
End page
687

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