Call for talks and posters for ESEB symposium "Evolutionary Ecology of Microbial Symbiosis" (Symposium #S22) at ESEB 2025, in Barcelona Spain. The ESEB 2025 Congress will be held at the International Convention Centre of Barcelona (CCIB) in Barcelona, Spain, from August 17 to 22,2025. Evolutionary Ecology of Microbial Symbiosis Microbial symbiosis plays a pivotal role in shaping the ecological and evolutionary trajectories of both host and microbial species. Symbiotic microbes can confer novel metabolic capabilities, enhance nutrient acquisition, and alter host phenotypes, facilitating resilience and adaptive potential in the face of environmental pressures. In return, hosts can drive the reciprocal adaptation and diversification of microbes within these relationships, by actively selecting and shaping their microbial partners. This symposium aims to bring together researchers questioning the importance of microbial symbiosis in promoting or challenging key evolutionary processes, such as adaptation, speciation, and ecological specialization in both hosts and microbes. By showcasing cutting-edge studies across diverse systems, we will re-examine the proposed roles of host-microbe interactions as drivers of rapid evolutionary change and/or as stabilizing forces in ecological interactions. We invite contributions that explore the theoretical, molecular, ecological, and evolutionary mechanisms underpinning microbial symbiosis, to renew the dialogue around its implications for the development and diversification of life on Earth. We have two exciting invited speakers: * Dr Marjolein BRUIJNING with a talk on 'The bacterial march to endosymbiosis: on-ramps and off-ramps', the University of Amsterdam (https://www.uva.nl/en/profile/b/r/m.bruijning/m.bruijning.html); and * Dr Lee HENRY with a talk on 'Bacterial symbionts: a horizontal gene pool for eukaryotes?', Queen Mary University of London (https://www.qmul.ac.uk/sbbs/staff/leehenry.html) Deadline for abstract submission: 25 April 2025. For more information and to submit your abstract, please visit: https://eseb2025.com/call-for-abstracts/ We look forward to seeing you in Barcelona in August 2025. Best wishes, Dr. Anne DUPLOUY, University of Helsinki, Finland (anne.duplouy'at'helsinki.fi) Prof. Wolfgang MILLER, Medical University of Vienna, Austria (wolfgang.miller'at'meduniwien.ac.at) Dr. Anne DUPLOUY Fellow of the Research Council of Finland Insect Symbiosis Ecology and Evolution (ISEE), PI Organismal & Evolutionary Biology Research Programme Faculty of Biological & Environmental Sciences Viikinkaari 1 Fi-00014 University of Helsinki, Finland www.anneduplouy.net @duplouy_anne "Duplouy, Anne M R" (to subscribe/unsubscribe the EvolDir send mail to golding@mcmaster.ca)