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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:20260424T114134
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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DTSTART;TZID=Europe/Paris:20190425T130000
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DTSTAMP:20260424T114134
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
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