Evolutionary consequences of deception： Complexity and informational content of colony signature are favored by social parasitism  

作　　者：Maria Cristina LORENZI Laura AZZANI Anne-Genevieve BAGNRRES 

机构地区：[1]Department of Life Sciences and Systems Biology, University of Turin, via Accademia Albertina 13, 10123 Torino, Italy [2]I.R.B.I. - UMR CNRS 7261 - Universit6 de Tours, Facult6 des Sciences, Parc Grandmont, 37200 Tours, France

出　　处：《Current Zoology》2014年第1期137-148,共12页动物学报（英文版）

摘　　要：Nestmate recognition codes show remarkable chemical complexity, involving multiple biochemical pathways. This complexity provides the opportunity to evaluate the ecological and social conditions that favor the evolution of complex signaling. We investigated how the chemical signatures of three populations of the social paper wasp Polistes biglumis differed in terms of concentration of hydrocarbons, proportions of branched hydrocarbons and overall variation. We tested whether the variation in chemical signatures among populations could be explained by the prevalence of social parasites or whether this was just an effect of local abiotic conditions which influenced the composition of the hydrocarbon cuticular layer. We studied the chemical signa- ture in three populations in which obligate social parasites differed in the selection pressures they imposed on host populations. Within each population, we restricted our analyses to non-parasitized hosts, to avoid potential short-term effects of parasite pres- ence on the host chemical signatures. We found that host colonies in parasitized populations had more diverse profiles than the parasite-free population. Moreover, the overall concentration of hydrocarbons and the relative proportion of branched hydrocar- bons were larger in the parasitized populations, relative to the non-parasitized one. This is to our knowledge the first evidence in favour of the hypothesis that different traits in the host chemical signatures as a whole undergo evolutionary changes resulting from directional or balancing selection imposed by social parasites. We conclude that obligate social parasites act as ＇engines of diversity＇ on host chemical signatures and operate in favor of a geographic mosaic of diverging communication codes

关 键 词：POLISTES Brood parasitism CIPHER Nestmate recognition Hydrocarbons Geographic mosaic Crozier＇s paradox 

分 类 号：TP393.08[自动化与计算机技术—计算机应用技术] S852.7[自动化与计算机技术—计算机科学与技术]