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In many environments, state transitions are an important part of our understanding of ecological change. These transitions are controlled by the interactions between exogenous forcing factors and stabilizing endogenous feedbacks. Forcing factors and feedbacks are typically considered to consist of different processes. We argue that during extreme events, a process that usually forms part of a stabilizing feedback can behave as a forcing factor. And thus, like Janus, a single process can have two faces. The case explored here pertains to state change in drylands where interactions between wind erosion and vegetation form an important feedback that encourages grass\u2010to\u2010shrub state transitions. Wind concentrates soil resources in shrub\u2010centered fertile islands, removes resources through loss of fines to favor deep\u2010rooted shrubs, and abrades grasses' photosynthetic tissue, thus further favoring the shrub state that, in turn, experiences greater aeolian transport. This feedback is well documented but the potential of wind to act also as a forcing has yet to be examined. Extreme wind events have the potential to act like other drivers of state change, such as drought and grazing, to directly reduce grass cover. This study examines the responses of a grass\u2010shrub community after two extreme wind events in 2019 caused severe deflation. We measured grass cover and root exposure due to deflation, in addition to shrub height, grass patch size, and grass greenness along 50\u2010m transects across a wide range of grass cover. Root exposure was concentrated in the direction of erosive winds during the storms and sites with low grass cover were associated with increased root exposure and reduced greenness. We argue that differences between extreme, rare wind events and frequent, small wind events are significant enough to be differences in kind rather than differences in degree allowing extreme winds to behave as endogenous forcings and common winds to participate in an endogenous stabilizing feedback. Several types of state change in other ecological systems in are contextualized within this framework.<\/jats:p>","DOI":"10.1002\/ecy.3998","type":"journal-article","created":{"date-parts":[[2023,2,17]],"date-time":"2023-02-17T09:05:04Z","timestamp":1676624704000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["The two faces of Janus: Processes can be both exogenous forcings and endogenous feedbacks with wind as a case study"],"prefix":"10.1002","volume":"104","author":[{"given":"Sarah A. R.","family":"Payne","sequence":"first","affiliation":[{"name":"Department of Geography University of California Los Angeles  Los Angeles California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0484-3537","authenticated-orcid":false,"given":"Gregory S.","family":"Okin","sequence":"additional","affiliation":[{"name":"Department of Geography University of California Los Angeles  Los Angeles California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7102-8233","authenticated-orcid":false,"given":"Abinash","family":"Bhattachan","sequence":"additional","affiliation":[{"name":"Department of Geography University of California Los Angeles  Los Angeles California USA"},{"name":"Department of Geosciences Texas Tech University  Lubbock Texas USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael R.","family":"Fischella","sequence":"additional","affiliation":[{"name":"Department of Geography University of California Los Angeles  Los Angeles California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,3,7]]},"reference":[{"volume-title":"102 mph Wind Gust Reported at San Augustin Pass","year":"2019","author":"Alba\u2010Soular D.","key":"e_1_2_9_2_1"},{"volume-title":"Weather: Wind Gust Hits 104 mph at San Augustin Pass; Train Derails","year":"2019","author":"Alba\u2010Soular D.","key":"e_1_2_9_3_1"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/ece3.205"},{"key":"e_1_2_9_5_1","unstructured":"Anderson J. 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