{ "153995-21917003": { "datetime_modified":"20261022T150756", "datetime_start":"20261103T120000", "datetime_end":"20261103T130000", "has_end_time":1, "date_start":"2026-11-03", "date_end":"2026-11-03", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"EEB Tuesday Seminar Series - Multi-environment fitness landscapes suggest effectively endless adaptation", "occurrence_title":"", "combined_title":"EEB Tuesday Seminar Series - Multi-environment fitness landscapes suggest effectively endless adaptation: George Zhang, Marshall W. Nirenberg Collegiate Professor", "event_subtitle":"George Zhang, Marshall W. Nirenberg Collegiate Professor", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Seminar Summary - The number of beneficial substitutions (N) required for an adapting population to reach a fitness peak is a fundamental but unknown parameter of evolution. We find that N increases linearly with the number of variable sites in empirical fitness landscapes, regardless of prior adaptation in another environment. Extrapolation suggests a minimal N of 10\u2075 for typical prokaryotes and 10\u2077 for mammals. In contrast, in highly rugged shuffled landscapes, N is markedly reduced, while fitness gains also shrink. The relatively smooth empirical landscapes therefore enable greater fitness gains while lengthening adaptive walks, rendering even local fitness peaks effectively unreachable because natural environments inevitably change. These results explain the persistence of fitness gains in long-term evolution experiments under constant environments and the widespread occurrence of beneficial mutations across species. They suggest that populations continuously adapt while remaining far from fitness optima, challenging the long-held view that adaptation culminates at fitness peaks.", "occurrence_notes":null, "guid":"153995-21917003@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/153995", "building_id":"1005169", "building_name":"Biological Sciences Building", "campus_maps_id":"631", "room":"3150", "location_name":"Biological Sciences Building", "has_livestream":0, "cost":"", "tags":["Professional Development","Research","Science","seminar","Talk","Workshop"], "website":"", "sponsors":[ { "group_name":"EEB Tuesday Lunch Seminars", "group_id":"3823", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/10\/event_153995_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/10\/event_153995_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/10\/event_153995_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/10\/event_153995_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/10\/event_153995_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/10\/event_153995_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/10\/event_153995_original-1.png" }, "occurrence_count":1, "first_occurrence":21917003 } , "154287-21917507": { "datetime_modified":"20261029T133042", "datetime_start":"20261110T120000", "datetime_end":"20261110T130000", "has_end_time":1, "date_start":"2026-11-10", "date_end":"2026-11-10", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"EEB Tuesday Seminar Series - mm-Scale Computers for Small Animal Studies", "occurrence_title":"", "combined_title":"EEB Tuesday Seminar Series - mm-Scale Computers for Small Animal Studies: David Blaauw, Kensall D. Wise Collegiate Professor of Electrical Engineering and Computer Science (EECS)", "event_subtitle":"David Blaauw, Kensall D. Wise Collegiate Professor of Electrical Engineering and Computer Science (EECS)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Seminar Summary - In this talk, we will discuss recent advances in small-scale computing systems that have opened up a range of new application areas. By reducing the power consumption of electronic circuits, the battery and\/or energy-harvesting source can be shrunk to sub-millimeter dimensions, allowing the overall system size to shrink as well. We will give a high-level overview of these low-power techniques and then illustrate a number of applications, including small-animal tracking.", "occurrence_notes":null, "guid":"154287-21917507@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/154287", "building_id":"1005169", "building_name":"Biological Sciences Building", "campus_maps_id":"631", "room":"4150", "location_name":"Biological Sciences Building", "has_livestream":0, "cost":"", "tags":["eeb","Environment","environmental","evolution","evolutionary biology","Research","Science","seminar","Workshop"], "website":"", "sponsors":[ { "group_name":"EEB Tuesday Lunch Seminars", "group_id":"3823", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/10\/event_154287_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/10\/event_154287_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/10\/event_154287_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/10\/event_154287_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/10\/event_154287_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/10\/event_154287_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/10\/event_154287_original-1.png" }, "occurrence_count":1, "first_occurrence":21917507 } }