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X-WR-CALDESC:Events for Namur Institute For Complex Systems
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DTSTART;TZID=Europe/Paris:20190404T130000
DTEND;TZID=Europe/Paris:20190404T140000
DTSTAMP:20260429T174118
CREATED:20181205T224534Z
LAST-MODIFIED:20190401T131104Z
UID:520-1554382800-1554386400@www.naxys.be
SUMMARY:Gyuri Barabas (University of Linköping\, Sweden)
DESCRIPTION:Title: The evolution of trait variance creates a tension between species and functional diversity\n\nAbstract: It seems intuitively obvious that species diversity begets functional (trait) diversity: the more plant species there are\, the more varied their leaf chemistry will be; more species of crops provide more kinds of food; etc. In this talk I argue that the evolution of trait variance challenges this view. In a trait-based eco-evolutionary model\, I show that when species richness is low\, individual species evolve large trait variation\, while in species-rich communities species avoid competition by evolving narrow trait breadths. This effect can be so strong that those communities with more but narrower species will cover a smaller fraction of the available trait space than those with fewer but intraspecifically more variable ones. The expected positive relationship between species and functional diversity is thus overhauled\, a result which proved extremely robust to changes in model setup and parameterization. I finish by presenting and discussing empirical data consistent with this claim.
URL:https://www.naxys.be/event/gyuri-barabas/
LOCATION:E25
CATEGORIES:NAXYS Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190409T130000
DTEND;TZID=Europe/Paris:20190409T140000
DTSTAMP:20260429T174118
CREATED:20190304T222416Z
LAST-MODIFIED:20190304T222416Z
UID:560-1554814800-1554818400@www.naxys.be
SUMMARY:Liubov Tupikina (CRI\, Paris Descartes\, France & MIPT\, Moscow\, Russia)
DESCRIPTION:Title: Heterogeneous spreading in network models \nAbstract: I will present some of our recent results on the random walks on networks with spatial and temporal heterogeneity. In particular\, I will discuss how the influence of heterogeneities can be encoded into the dynamics of continuous time random walk model. Continuous limits of heterogeneous continuous time random walks can lead to various diffusion equations\, which opens new questions about general description of spreading in heterogeneous media. Then I will talk about some applications of the heterogeneous random walk model to the epidemiological models on static or temporal networks and some potential applications to the real data.
URL:https://www.naxys.be/event/liubov-tupikina-cri-paris-descartes-france-mipt-moscow-russia/
LOCATION:E25
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190423T130000
DTEND;TZID=Europe/Paris:20190423T140000
DTSTAMP:20260429T174118
CREATED:20190124T081010Z
LAST-MODIFIED:20190327T103542Z
UID:537-1556024400-1556028000@www.naxys.be
SUMMARY:Emmanuel Flachaire (Aix-Marseille University\, France)
DESCRIPTION:Title: Pareto Models for Top Incomes \nAuthors: Arthur Charpentier (UQAM) and Emmanuel Flachaire (Aix-Marseille University) \nAbstract: Top incomes are often related to Pareto distribution. To date\, economists have mostly used Pareto Type I distribution to model the upper tail of income and wealth distribution. It is a parametric distribution\, with an attractive property\, that can be easily linked to economic theory. In this paper\, we first show that modelling top incomes with Pareto Type I distribution can lead to severe over-estimation of inequality\, even with millions of observations. To overcome this problem\, we then show that other Pareto distributions should be used. Two applications illustrate these characteristics\, with the distribution of income in South Africa in 2012 and the distribution of wealth in the United States in 2013.
URL:https://www.naxys.be/event/emmanuel-flachaire/
LOCATION:E25
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190425T130000
DTEND;TZID=Europe/Paris:20190425T140000
DTSTAMP:20260429T174118
CREATED:20181119T095453Z
LAST-MODIFIED:20190401T131233Z
UID:509-1556197200-1556200800@www.naxys.be
SUMMARY:Oscar Godoy (University of Cádiz\, Spain)
DESCRIPTION:Title: Functional and multitrophic mechanisms of species coexistence \nAbstract: Ecologists have been investigating for decades the mechanisms that maintain the diversity of species within ecological communities. In particular\, several functional traits and interactions with mutualists have been thought to promote the stabilizing effect of niche differences on population dynamics of competing species. These effects occur because higher intraspecific compared to interspecific competition limits species abundance when they are common yet buffer them again extinction when they are rare. Recent advances in coexistence theory have now the opportunity to rigorously evaluate such relationships by coupling experimental and observational approaches to species population models\, and surprisingly\, they are showing a much more complex mapping that previously thought. As an example\, most of the plant functional traits widely measured in the literature does not provide a demographic signature of niche differences\, instead\, they promote competitive imbalances between species that lead to competitive exclusion. Only traits and phenotypic plasticity related to light and water use efficiency promote niche partitioning between species. In a similar fashion\, multitrophic interactions that plant species establish with floral visitors are an equalising rather than a stabilizing\, which promote species coexistence by decreasing the competitive ability of superior competitors and increase that of inferior competitors. Although the examples I will provide are mostly for plant species\, the underlying ecological mechanisms are common to any taxa type\, so I expect a fruitful discussion of how these ideas and experiments can be extended to other ecological systems.
URL:https://www.naxys.be/event/oscar-godoy-university-of-cadiz-spain/
LOCATION:E25
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190430T140000
DTEND;TZID=Europe/Paris:20190430T150000
DTSTAMP:20260429T174118
CREATED:20190424T105807Z
LAST-MODIFIED:20190424T105918Z
UID:574-1556632800-1556636400@www.naxys.be
SUMMARY:Joni Virta (Aalto University\, Helsinki\, Finland)
DESCRIPTION:Title: Statistical properties of second-order tensor decompositions \nAuthors: Joni Virta\, Christoph Kösner\, Niko Lietzén\, Klaus Nordhausen \nAbstract: Two classical tensor decompositions are considered from a statistical viewpoint: the Tucker decomposition and the higher order singular value decomposition (HOSVD). Both decompositions are shown to be consistent estimators of the parameters of a certain noisy latent variable model. The decompositions’ asymptotic properties allow comparisons between them. Also inference for the true latent dimension is discussed. The theory is illustrated with examples.
URL:https://www.naxys.be/event/joni-virta/
LOCATION:E25
CATEGORIES:NAXYS Seminar
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