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X-WR-CALDESC:Events for International Initiative for Theoretical Ecology
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DTSTART;TZID=Europe/London:20201013T170000
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DTSTAMP:20261022T232645
CREATED:20200915T160044Z
LAST-MODIFIED:20201023T112738Z
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SUMMARY:Vadim Karatayev (University of Guelph): Species heterogeneity can reduce the potential for alternative stable states in food webs
DESCRIPTION:Abstract. Can alternative stable states arise when food webs dissipate feedbacks across many species in diverse systems like coral reefs? Although consumer loss often characterizes degraded ecological states\, food web resilience theory predominantly focuses on specific systems and few-species models. After developing a generalized model of consumer collapse\, we show that alternative stable states dominated by either consumer or resource guilds can arise when consumer species improve conditions in the same way\, for instance when different herbivore species promote habitat-forming corals by limiting the total cover of macroalgae. Conversely\, specialized feedbacks where size refugia or group defense make individual resource species inedible are less likely to drive many-species alternative stable states because losing the most vulnerable consumers cascades into a guild-wide collapse. \nVadim Karatayev\, Marissa Baskett\, Egbert van Nes\, Marten Scheffer \nZoom link: https://liu-se.zoom.us/j/63158449287 \neventbrite link (for reminders): https://www.eventbrite.co.uk/e/theoretical-ecology-seminar-series-tickets-119884512805 \nVideo: https://www.youtube.com/watch?v=2bZfsRBXJX4
URL:https://iite.info/event/vadim-karatayev-university-of-guelph-species-heterogeneity-can-reduce-the-potential-for-alternative-stable-states-in-food-webs/
CATEGORIES:IITE Seminar
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DTSTART;TZID=America/Los_Angeles:20201027T090000
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DTSTAMP:20261022T232645
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LAST-MODIFIED:20201021T145313Z
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SUMMARY:André M. de Roos (University of Amsterdam): Dynamics of within-population structure stabilise complex ecological communities
DESCRIPTION:Warning! \nDuring this week the time difference between America and Europe is one hour less\, than usual. The seminar will begin at 9 am Pacific\, as always\, but now it will correspond to 4 pm in London and 5 pm in Paris. \nAbstract: \nDynamic models of ecological communities that neglect within-population structure predict that stability depends on substantial self-limitation of species. Using a stage-structured food web model I show that differences between juveniles and adults result in diverse ecological communities that are stable or exhibit limited-amplitude fluctuations\, despite that only a single basal species is self-regulated. Eigenvalue analysis reveals that community stability results from dynamic changes in within-population stage-structure that override destabilising effects induced by the species interaction network. \nZoom link: https://liu-se.zoom.us/j/63158449287 \neventbrite link (for reminders): https://www.eventbrite.co.uk/e/theoretical-ecology-seminar-series-tickets-119884512805
URL:https://iite.info/event/camille-carpentier-university-of-namur-a-new-link-species-relationship-connects-ecosystem-structure-and-stability/
CATEGORIES:IITE Seminar
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