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X-WR-CALDESC:Events for International Initiative for Theoretical Ecology
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210406T090000
DTEND;TZID=America/Los_Angeles:20210406T100000
DTSTAMP:20261022T215737
CREATED:20210311T183758Z
LAST-MODIFIED:20210315T115223Z
UID:947-1617699600-1617703200@iite.info
SUMMARY:György Barabás (Linköping): Coexistence and parameter sensitivity in stationary aperiodic environments
DESCRIPTION:Abstract:\nFirst\, I present a method for calculating how average population densities respond to parameter perturbations when the dynamics are periodic\, and show that this practical problem holds a strong connection with basic questions of coexistence. I then generalize this result to stationary nonperiodic density fluctuations. I finish by discussing the connection with existing formalisms for understanding coexistence in variable environments. \nZoom link: https://liu-se.zoom.us/j/63158449287 \nPast lectures are on the YouTube channel: https://www.youtube.com/c/TheoreticalEcologySeminarSeries \neventbrite link (for reminders): https://www.eventbrite.co.uk/e/theoretical-ecology-seminar-series-tickets-119884512805
URL:https://iite.info/event/gyorgy-barabas-eotvos-university-coexistence-and-parameter-sensitivity-in-stationary-aperiodic-environments/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210323T090000
DTEND;TZID=America/Los_Angeles:20210323T100000
DTSTAMP:20261022T215737
CREATED:20210304T131639Z
LAST-MODIFIED:20210320T062855Z
UID:937-1616490000-1616493600@iite.info
SUMMARY:Theresa Ong (Dartmouth College): Complex hysteretic patterns: hidden loops and ecological traps
DESCRIPTION:NOTE:\n Because of the asynchronous transition to Summer Time\, the usual time of the seminar (9 a.m. Pacific) is one hour earlier in Europe: 4 p.m. London and 5 p.m. Paris. \nAbstract:\nCritical transitions whereby small changes in conditions can cause large and irreversible changes in ecosystem states are a cause of increasing concern in ecology. Here\, I focus on the irreversibility of these transitions\, formally known as hysteresis. I will discuss a variety of complicated hysteretic patterns derived from theory and experiments\, which include “unattainable” stable states that once lost may never be recovered. \nZoom link: https://liu-se.zoom.us/j/63158449287 \nPast lectures are on the YouTube channel: https://www.youtube.com/c/TheoreticalEcologySeminarSeries \neventbrite link (for reminders): https://www.eventbrite.co.uk/e/theoretical-ecology-seminar-series-tickets-119884512805
URL:https://iite.info/event/theresa-ong-tbd/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210309T090000
DTEND;TZID=America/Los_Angeles:20210309T100000
DTSTAMP:20261022T215737
CREATED:20210223T142844Z
LAST-MODIFIED:20210302T185459Z
UID:923-1615280400-1615284000@iite.info
SUMMARY:Géza Meszéna (Eötvös University): Coexistence\, niche\, adaptation and all that...
DESCRIPTION:Abstract:\nWhy are there so many animals? According an old idea\, it is because there are so many different possibilities for life to adapt to. I’ll argue that it is still true\, and truer than the suggested alternatives. The challenge is to establish the precise mathematical treatment at this level of generality without losing the reach to the phenomenal complexity of the ecosystems. \nZoom link: https://liu-se.zoom.us/j/63158449287 \nPast lectures are on the YouTube channel: https://www.youtube.com/c/TheoreticalEcologySeminarSeries \neventbrite link (for reminders): https://www.eventbrite.co.uk/e/theoretical-ecology-seminar-series-tickets-119884512805
URL:https://iite.info/event/geza-meszena-eotvos-university-coexistence-niche-adaptation-and-all-that/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20210223T090000
DTEND;TZID=America/Vancouver:20210223T100000
DTSTAMP:20261022T215737
CREATED:20210117T084422Z
LAST-MODIFIED:20210223T144117Z
UID:905-1614070800-1614074400@iite.info
SUMMARY:James O'Dwyer (University of Illinois): Cooperation\, Resource Exchange\, and Stability
DESCRIPTION:Abstract:\nModels of microbial interactions have been developed in recent years\, drawing from taxonomic abundances via amplicon sequencing. Many of these models assume that dynamics through time are primarily driven by pairwise interactions between taxa\, but with the drawback that how these interaction strengths may change with environmental context is less than clear. Here we model the consumption and exchange of resources explicitly\, and show that these processes imply new results and principles for the stability of ecological communities. \nZoom link: https://liu-se.zoom.us/j/63158449287 \nPast lectures are on the YouTube channel: https://www.youtube.com/c/TheoreticalEcologySeminarSeries \neventbrite link (for reminders): https://www.eventbrite.co.uk/e/theoretical-ecology-seminar-series-tickets-119884512805
URL:https://iite.info/event/james-odweyer-university-of-illinois-tbd/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210209T090000
DTEND;TZID=America/Los_Angeles:20210209T100000
DTSTAMP:20261022T215737
CREATED:20210119T162442Z
LAST-MODIFIED:20210126T163740Z
UID:910-1612861200-1612864800@iite.info
SUMMARY:Thomas Koffel (Michigan State): A niche theory of positive interactions
DESCRIPTION:Abstract:\nNiche Theory has traditionally focused on competitive interactions. In this talk\, we propose a general framework that expands the theory to positive interactions\, such as facilitation and mutualism\, using angular metrics of niche difference. We develop novel niche concepts such as the Allee niche and niche expansion\, and illustrate them using a diverse set of theoretical examples. \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/thomas-koffel-michigan-state-tbd/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210126T090000
DTEND;TZID=America/Los_Angeles:20210126T100000
DTSTAMP:20261022T215737
CREATED:20200928T182054Z
LAST-MODIFIED:20210107T161138Z
UID:837-1611651600-1611655200@iite.info
SUMMARY:Stephen Ellner (Cornell): An invitation to spatial coexistence theory
DESCRIPTION:Stephen Ellner (Cornell)\, Peter Adler (Utah State)\, Giles Hooker (Cornell)\, Robin Snyder (Case Western): An invitation to spatial coexistence theory. \nAbstract:\nPreviously in this series Sebastian Schreiber reviewed stochastic coexistence theory for infinite population models\, based on long-term population growth rates of (infinitesimally) rare invaders. Nadav Shnerb presented progress on the challenges posed by demographic stochasticity\, in finite populations of discrete individuals. Today we add one more complication: spatial structure and local movement\, so that invader populations are clumped\, and locally common even when globally rare. \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 \n 
URL:https://iite.info/event/stephen-ellner-cornell-tbd/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210112T090000
DTEND;TZID=America/Los_Angeles:20210112T100000
DTSTAMP:20261022T215737
CREATED:20200928T181733Z
LAST-MODIFIED:20210107T160020Z
UID:834-1610442000-1610445600@iite.info
SUMMARY:Camille Carpentier (University of Namur): A new link-species relationship connects ecosystem structure and stability
DESCRIPTION:Abstract:\nHow does an ecosystem’s structure determine its capacity to cope with species removal and perturbations of species densities? To answer this question\, we develop a network-specific approach to the link-species relationship\, and demonstrate that it formally predicts a robustness-resilience trade-off\, both theoretically and in empirical networks. \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/tbd/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201208T090000
DTEND;TZID=America/Los_Angeles:20201208T100000
DTSTAMP:20261022T215737
CREATED:20201112T132117Z
LAST-MODIFIED:20201204T061619Z
UID:883-1607418000-1607421600@iite.info
SUMMARY:Nadav Shnerb (Bar-Ilan University): Quantifying coexistence
DESCRIPTION:Abstract. \nModern coexistence theory employs mutual invasibility as a coexistence criterion and mean growth rate when rare as an invasibility criterion. When implemented as quantitative metrics\, both criteria have shortcomings: persistence time may decline when the chance of invasion grows\, and invasibility may decrease as the mean growth rate increases in magnitude. I will discuss an alternative framework and introduce a new metric for invasibility under both demographic and environmental stochasticity. \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/nadav-shnerb-bar-ilan-university/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201124T090000
DTEND;TZID=America/Los_Angeles:20201124T100000
DTSTAMP:20261022T215737
CREATED:20200928T181223Z
LAST-MODIFIED:20201008T143745Z
UID:828-1606208400-1606212000@iite.info
SUMMARY:Stefano Allesina (University of Chicago): A metapopulation model in which patches have memory
DESCRIPTION:Levins’ metapopulation model has been extended in numerous ways. Here we analyze a model in which species have distinct colonization rates that depend on which species previously occupied the patch. We connect this model to the Janzen-Connell hypothesis and show some surprising behavior for a simplified version of the model. \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/stefano-allesina-uc-tbd/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201109T090000
DTEND;TZID=America/Los_Angeles:20201109T100000
DTSTAMP:20261022T215737
CREATED:20200928T180819Z
LAST-MODIFIED:20201019T070319Z
UID:825-1604912400-1604916000@iite.info
SUMMARY:Sebastian Schreiber (UC Davis): Towards a general theory of coexistence: Lyapunov exponents\, auxiliary variables\, and Hofbauer's criterion
DESCRIPTION:Warning: this is a Monday! \nAbstract: In the 1980s\, Josef Hofbauer introduced a criterion for mathematically verifying coexistence using per-capita growth rates of species when rare i.e. Lyapunov exponents. This criterion ensures coexistence is robust to large perturbations of  the community state (i.e. permanence) and small structural perturbations of the governing equations (i.e. robust permanence). Originally developed for deterministic models without population structure\, Hofbauer’s criterion has been extended in the past decade to models allowing for auxiliary variables and environmental stochasticity. In this talk\, I review the key ingredients of this theory and illustrate its use in multi-species models with intransitivities\, eco-evolutionary feedbacks\, sexual dimorphisms\, autocorrelated environmental fluctuations\, or spatial structure.  \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 \n 
URL:https://iite.info/event/sebastian-schreiber-uc-davis-general-theorems-for-coexistence-and-extinction-in-stochastic-models/
CATEGORIES:IITE Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201027T090000
DTEND;TZID=America/Los_Angeles:20201027T100000
DTSTAMP:20261022T215737
CREATED:20200928T175808Z
LAST-MODIFIED:20201021T145313Z
UID:823-1603789200-1603792800@iite.info
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20201013T170000
DTEND;TZID=Europe/London:20201013T180000
DTSTAMP:20261022T215737
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20200929T170000
DTEND;TZID=Europe/London:20200929T180000
DTSTAMP:20261022T215737
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:20261022T215737
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
END:VEVENT
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