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X-WR-CALNAME:International Initiative for Theoretical Ecology
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X-WR-CALDESC:Events for International Initiative for Theoretical Ecology
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DTSTART:20201025T010000
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DTSTART;TZID=Europe/London:20201013T170000
DTEND;TZID=Europe/London:20201013T180000
DTSTAMP:20261022T180049
CREATED:20200915T160044Z
LAST-MODIFIED:20201023T112738Z
UID:804-1602608400-1602612000@iite.info
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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BEGIN:VEVENT
DTSTART;TZID=Europe/London:20200929T170000
DTEND;TZID=Europe/London:20200929T180000
DTSTAMP:20261022T180049
CREATED:20200907T180133Z
LAST-MODIFIED:20201023T112411Z
UID:797-1601398800-1601402400@iite.info
SUMMARY:Éva Kisdi (University of Helsinki): The evolution of habitat choice facilitates niche expansion
DESCRIPTION:Abstract: Matching habitat choice and local adaptation are two key factors that control the distribution and diversification of species. We study their joint evolution in a structured metapopulation model with a continuous distribution of habitats. Habitat choice follows from dispersal with non-random immigration\, a process always acknowledged yet rarely incorporated into theoretical models. For fixed local adaptation\, we find the evolutionarily stable habitat choice as a function linking the probability of settlement to the local environment. When the local adaptation trait co-evolves\, the metapopulation can become polymorphic. Our main result shows that coexisting strains with only slightly different local adaptation traits evolve substantially different habitat choice. In turn\, different habitat use selects for divergent local adaptations. We thus propose that under wide conditions\, the joint evolution of habitat choice and local adaptation can facilitate niche expansion via diversification. \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=qMpR1mNLkq4&t=293s
URL:https://iite.info/event/eva-kisdi-t-b-a/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20200915T170000
DTEND;TZID=Europe/London:20200915T180000
DTSTAMP:20261022T180049
CREATED:20200905T182545Z
LAST-MODIFIED:20201023T112603Z
UID:787-1600189200-1600192800@iite.info
SUMMARY:Guy Bunin: Phase-transitions as signatures of complex communities
DESCRIPTION:Abstract: What characterizes species-rich communities with complex species interactions–for example\, competing over many niches? Models predict sharp transitions\, as conditions are changed\, between qualitatively different dynamical behaviors. These include the abrupt appearance of a vast number of alternative steady-states; and the onset of persistent abundance fluctuations\, nearly uncorrelated between species. We discuss these phenomena\, and how they differ from related low-dimensional behavior. \nVideo: https://www.youtube.com/watch?v=Dw3Gsa8FI18
URL:https://iite.info/event/guy-bunin-complex-communities/
CATEGORIES:IITE Seminar
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