Cremer, S and Ugelvig, LV and Drijfhout, FP and Schlick-Steiner, BC and Steiner, FM and Seifert, B and Hughes, DP and Schulz, A and Petersen, KS and Konrad, H and Stauffer, C and Kiran, K and Espadaler, X and d'Ettorre, P and Aktaç, N and Eilenberg, J and Jones, GR and Nash, DR and Pedersen, JS and Boomsma, JJ (2008) The evolution of invasiveness in garden ants. PLoS One, 3 (12). e3838 - ?. ISSN 1932-6203

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Abstract

It is unclear why some species become successful invaders whilst others fail, and whether invasive success depends on pre-adaptations already present in the native range or on characters evolving de-novo after introduction. Ants are among the worst invasive pests, with Lasius neglectus and its rapid spread through Europe and Asia as the most recent example of a pest ant that may become a global problem. Here, we present the first integrated study on behavior, morphology, population genetics, chemical recognition and parasite load of L. neglectus and its non-invasive sister species L. turcicus. We find that L. neglectus expresses the same supercolonial syndrome as other invasive ants, a social system that is characterized by mating without dispersal and large networks of cooperating nests rather than smaller mutually hostile colonies. We conclude that the invasive success of L. neglectus relies on a combination of parasite-release following introduction and pre-adaptations in mating system, body-size, queen number and recognition efficiency that evolved long before introduction. Our results challenge the notion that supercolonial organization is an inevitable consequence of low genetic variation for chemical recognition cues in small invasive founder populations. We infer that low variation and limited volatility in cuticular hydrocarbon profiles already existed in the native range in combination with low dispersal and a highly viscous population structure. Human transport to relatively disturbed urban areas thus became the decisive factor to induce parasite release, a well established general promoter of invasiveness in non-social animals and plants, but understudied in invasive social insects.

Item Type: Article
Uncontrolled Keywords: Ants, Invasive species, Cuticular hydrocarbons, Aggression, Population genetics, Parasite evolution, Insect pests, Asia
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 19 Nov 2014 10:42
Last Modified: 02 Feb 2017 16:03
URI: http://eprints.keele.ac.uk/id/eprint/60

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