IFISC Seminar on Wednesday Dec 15, 2021 at 14:30 Place: Zoom Seminar Title: Models of nested populations: how does collective function evolve? Speaker: Silvia de Monte, ENS Paris Abstract: <p style="margin-left:0cm; margin-right:0cm; text-align:start"><span style="font-size:medium"><span style="font-family:Calibri,sans-serif"><span style="color:#000000"><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">Directed evolution experiments have demonstrated the possibility to select genes or cellular lineages with specific characteristics or functions. Increasing effort is devoted to applying the same principles to microbial communities</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">.</span></span></span><br /> <br /> <span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">I will first describe a model of&nbsp;</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">a community of two species.&nbsp;I will show that collective-level selection drives the evolution of interspecific interactions, so that the target function becomes heritable</span></span></span>&nbsp;<span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">via the emergence of a &#39;development&#39; that corrects for the possible stochastic variation in community composition.</span></span></span><br /> <br /> <span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">The second model descibes a large number of species.&nbsp;</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">Interactions&nbsp;</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">are assumed to be initially random, and selection is applied to the total population size. Analytical approximations reproduce numerical simulations and the interplay of directional and stochastic variation</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style=&q uot;color:black">.&nbsp;</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">They show tha</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">t</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">&nbsp;selection for higher biomass enhance mutualism and diversity</span></span></span><span style="font-size:13.5pt"><span style="font-family:-webkit-standard,serif"><span style="color:black">.</span></span></span><br /> <br /> <span style="font-family:&quot;Times New Roman&quot;,serif"><a href="https://us02web.zoom.us/j/83829318876?pwd=Z2pqbUtIMEV3NUQvU0hpakp0NGtsUT09"><span style="color:blue">https://us02web.zoom.us/j/83829318876?pwd=Z2pqbUtIMEV3NUQvU0hpakp0NGtsUT09</span></a></span></span></span></span></p>; <p>&nbsp;</p> Url event:https://ifisc.uib-csic.es/en/events/seminars/models-of-nested-populations-ho...