{"date_published":"2016-07-01T00:00:00Z","language":[{"iso":"eng"}],"date_created":"2018-12-11T11:50:17Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publication_status":"published","publisher":"Institute of Science and Technology Austria","title":"Evolutionary proccesses in variable emvironments","abstract":[{"text":"Natural environments are never constant but subject to spatial and temporal change on\r\nall scales, increasingly so due to human activity. Hence, it is crucial to understand the\r\nimpact of environmental variation on evolutionary processes. In this thesis, I present\r\nthree topics that share the common theme of environmental variation, yet illustrate its\r\neffect from different perspectives.\r\nFirst, I show how a temporally fluctuating environment gives rise to second-order\r\nselection on a modifier for stress-induced mutagenesis. Without fluctuations, when\r\npopulations are adapted to their environment, mutation rates are minimized. I argue\r\nthat a stress-induced mutator mechanism may only be maintained if the population is\r\nrepeatedly subjected to diverse environmental challenges, and I outline implications of\r\nthe presented results to antibiotic treatment strategies.\r\nSecond, I discuss my work on the evolution of dispersal. Besides reproducing\r\nknown results about the effect of heterogeneous habitats on dispersal, it identifies\r\nspatial changes in dispersal type frequencies as a source for selection for increased\r\npropensities to disperse. This concept contains effects of relatedness that are known\r\nto promote dispersal, and I explain how it identifies other forces selecting for dispersal\r\nand puts them on a common scale.\r\nThird, I analyse genetic variances of phenotypic traits under multivariate stabilizing\r\nselection. For the case of constant environments, I generalize known formulae of\r\nequilibrium variances to multiple traits and discuss how the genetic variance of a focal\r\ntrait is influenced by selection on background traits. I conclude by presenting ideas and\r\npreliminary work aiming at including environmental fluctuations in the form of moving\r\ntrait optima into the model.","lang":"eng"}],"date_updated":"2023-09-07T11:55:53Z","related_material":{"record":[{"status":"public","relation":"part_of_dissertation","id":"2023"}]},"month":"07","publication_identifier":{"issn":["2663-337X"]},"year":"2016","oa_version":"Published Version","oa":1,"file":[{"file_size":3564901,"file_id":"6811","checksum":"81dcc838dfcf7aa0b1a27ecf4fe2da4e","content_type":"application/pdf","date_created":"2019-08-13T09:01:00Z","date_updated":"2019-08-13T09:01:00Z","file_name":"Novak_thesis.pdf","access_level":"closed","creator":"dernst","relation":"main_file"},{"file_size":2814384,"date_created":"2021-02-22T13:42:47Z","content_type":"application/pdf","checksum":"30808d2f7ca920e09f63a95cdc49bffd","file_id":"9186","success":1,"file_name":"2016_Novak_Thesis.pdf","access_level":"open_access","date_updated":"2021-02-22T13:42:47Z","relation":"main_file","creator":"dernst"}],"day":"01","author":[{"full_name":"Novak, Sebastian","first_name":"Sebastian","id":"461468AE-F248-11E8-B48F-1D18A9856A87","last_name":"Novak","orcid":"0000-0002-2519-824X"}],"article_processing_charge":"No","_id":"1125","file_date_updated":"2021-02-22T13:42:47Z","publist_id":"6235","type":"dissertation","department":[{"_id":"NiBa"}],"ddc":["576"],"status":"public","supervisor":[{"first_name":"Nicholas H","full_name":"Barton, Nicholas H","orcid":"0000-0002-8548-5240","last_name":"Barton","id":"4880FE40-F248-11E8-B48F-1D18A9856A87"}],"has_accepted_license":"1","degree_awarded":"PhD","alternative_title":["ISTA Thesis"],"citation":{"short":"S. Novak, Evolutionary Proccesses in Variable Emvironments, Institute of Science and Technology Austria, 2016.","chicago":"Novak, Sebastian. “Evolutionary Proccesses in Variable Emvironments.” Institute of Science and Technology Austria, 2016.","apa":"Novak, S. (2016). <i>Evolutionary proccesses in variable emvironments</i>. Institute of Science and Technology Austria.","ista":"Novak S. 2016. Evolutionary proccesses in variable emvironments. Institute of Science and Technology Austria.","ama":"Novak S. Evolutionary proccesses in variable emvironments. 2016.","mla":"Novak, Sebastian. <i>Evolutionary Proccesses in Variable Emvironments</i>. Institute of Science and Technology Austria, 2016.","ieee":"S. Novak, “Evolutionary proccesses in variable emvironments,” Institute of Science and Technology Austria, 2016."},"page":"124"}