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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/1091894179 Title: Impacts of global changes on biological invasions and interspecific hybridization within the Tetramorium caespitum ant species complex Author: Marion Cordonnier; Gilles Escarguel; Bernard Kaufmann; Emmanuel Desouhant; Pierre-André Crochet; Carole Kerdelhué; Laurence Després; Patrizia D'Ettorre; Sébastien Devillard; Université de Lyon (2015-....); École Doctorale Evolution Ecosystèmes Microbiologie Modélisation; Université Claude Bernard (Lyon); Laboratoire d'Écologie, des Hydrosystèmes Naturels et Anthropisés Publisher: 2018. OCLC:1091894179

  
  

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Impacts of global changes on biological invasions and interspecific hybridization within the Tetramorium caespitum ant species complex

Author:	Marion Cordonnier; Gilles Escarguel; Bernard Kaufmann; Emmanuel Desouhant; Pierre-André Crochet; All authors
Publisher:	2018.
Dissertation:	Thèse de doctorat : Écologie : Lyon : 2018.
Edition/Format:	Computer file : Document : Thesis/dissertation : English
Summary:	Changement climatique, urbanisation, invasions biologiques et hybridation interspécifique constituent des menaces majeures pour la biodiversité. L'objectif de cette thèse a été d'évaluer leurs effets interactifs sur les fourmis du genre Tetramorium de la vallée du Rhône, France. Près de 2000 colonies de 5 espèces de Tetramorium ont été étudiées. Les résultats démontrent que le climat et l'urbanisation limitent leurs aires de répartition et que l'urbanisation impacte leurs distributions simultanément à plusieurs échelles spatiales. Les probabilités d'occurrence de T. immigrans dépendent de l'interaction entre facteurs climatiques et urbains. Quatre populations génétiques de T. immigrans résultent de plusieurs introductions de sources externes, ce qui signifie que cette espèce n'est pas indigène dans les zones urbaines du nord. T. immigrans et T. caespitum produisent des hybrides dans les zones de sympatrie. La détection de rétrocroisements et de discordances entre ADN mitochondrial et nucléaire suggère que cette hybridation conduit à une descendance fertile, donc de l'introgression. Les profils d'hydrocarbures cuticulaires sont bien différenciés entre les deux espèces et sont corrélés à une agression forte contre les hétérospécifiques. Ces espèces présentent un système d'accouplement monogyne polyandre, dans lequel les reines hybrides mais pas les pères hybrides contribuent à la descendance hybride. Les études sur l'hybridation interspécifique n'ont qu'occasionnellement concerné les changements globaux ou invasions biologiques. Ces concepts eux-mêmes sont peu étudiés ensemble et leurs effets interactifs sont négligés dans la littérature actuelle. La prise en compte de ces interrelations et l'exploration de plusieurs échelles sont essentielles pour mieux comprendre les processus qui génèrent des modèles d'échange génétique. Climate change, urbanization, biological invasions and interspecific hybridization are major current threats to biodiversity. The objective of this thesis was to assess their interactive effects in Tetramorium ant species from the Rhône-Saône valley in France. Using a broad array of tools from several fields of biology, I worked on almost two thousand colonies from five Tetramorium species including T. immigrans and T. caespitum. Both climate and urbanization limited the ranges of these species, and urbanization impacted their distributions simultaneously at several spatial scales. The occurrence probabilities of T. immigrans depended on the interaction between climatic and urban factors. Several introductions from external sources seemed to have given rise to four genetically distinct populations of T. immigrans, making it likely that it is not native to the northernmost urban areas. Hybridization and introgression between T. immigrans and T. caespitum was frequent in zones of sympatry, and the detection of nuclear DNA backcrosses and mitochondrial-nuclear DNA discordance between the two species suggested that hybridization lead to fertile offspring (i.e. introgression). Cuticular hydrocarbon profiles were clearly differentiated between the two species and were correlated to heightened interspecific aggression against heterospecifics. Both species presented a monogyne polyandrous mating system, in which hybrid queens but no hybrid fathers contributed to hybrid offspring. Few studies on interspecific hybridization have addressed global change or biological invasions. These concepts are infrequently studied together, and their interactive effects are overlooked in the current literature. Taking these interrelationships into account and exploring multiple scales are essential to better understand the processes that generate patterns of genetic exchange.  Read more...
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Subjects	Changement global de l'environnement. Invasions biologiques. Hybridation. View all subjects
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