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  • 1.
    Barabas, György
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten.
    The coexistence problem revisited2017Inngår i: NATURE ECOLOGY and EVOLUTION, ISSN 2397-334X, Vol. 1, nr 10, s. 1425-1426Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    A new theoretical study warns against common misinterpretations of classical ideas on the limits to species diversity.

  • 2.
    Barabas, György
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten.
    D'Andrea, Rafael
    Univ Illinois, IL 61801 USA.
    Stump, Simon Maccracken
    Yale Sch Forestry and Environm Studies, CT 06511 USA.
    Chesson's coexistence theory2018Inngår i: Ecological Monographs, ISSN 0012-9615, E-ISSN 1557-7015, Vol. 88, nr 3, s. 277-303Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    We give a comprehensive review of Chesson's coexistence theory, summarizing, for the first time, all its fundamental details in one single document. Our goal is for both theoretical and empirical ecologists to be able to use the theory to interpret their findings, and to get a precise sense of the limits of its applicability. To this end, we introduce an explicit handling of limiting factors, and a new way of defining the scaling factors that partition invasion growth rates into the different mechanisms contributing to coexistence. We explain terminology such as relative nonlinearity, storage effect, and growth-density covariance, both in a formal setting and through their biological interpretation. We review the theory's applications and contributions to our current understanding of species coexistence. While the theory is very general, it is not well suited to all problems, so we carefully point out its limitations. Finally, we critique the paradigm of decomposing invasion growth rates into stabilizing and equalizing components: we argue that these concepts are useful when used judiciously, but have often been employed in an overly simplified way to justify false claims.

  • 3.
    Barabas, György
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten. University of Chicago, IL 60637 USA.
    Michalska-Smith, Matthew J.
    University of Chicago, IL 60637 USA.
    Allesina, Stefano
    University of Chicago, IL 60637 USA; Northwestern University, IL 60208 USA.
    Self-regulation and the stability of large ecological networks2017Inngår i: NATURE ECOLOGY and EVOLUTION, ISSN 2397-334X, Vol. 1, nr 12, s. 1870-+Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The stability of complex ecological networks depends both on the interactions between species and the direct effects of the species on themselves. These self-effects are known as self-regulation when an increase in a species abundance decreases its per-capita growth rate. Sources of self-regulation include intraspecific interference, cannibalism, time-scale separation between consumers and their resources, spatial heterogeneity and nonlinear functional responses coupling predators with their prey. The influence of self-regulation on network stability is understudied and in addition, the empirical estimation of self-effects poses a formidable challenge. Here, we show that empirical food web structures cannot be stabilized unless the majority of species exhibit substantially strong self-regulation. We also derive an analytical formula predicting the effect of self-regulation on network stability with high accuracy and show that even for random networks, as well as networks with a cascade structure, stability requires negative self-effects for a large proportion of species. These results suggest that the aforementioned potential mechanisms of self-regulation are probably more important in contributing to the stability of observed ecological networks than was previously thought.

  • 4.
    Rael, Rosalyn C.
    et al.
    Univ Michigan, MI 48109 USA; Tulane Univ, LA 70118 USA.
    D'Andrea, Rafael
    Univ Michigan, MI 48109 USA; Univ Illinois, IL 61801 USA.
    Barabas, György
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten. Univ Michigan, MI 48109 USA.
    Östling, Annette
    Univ Michigan, MI 48109 USA.
    Emergent niche structuring leads to increased differences from neutrality in species abundance distributions2018Inngår i: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 99, nr 7, s. 1633-1643Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Species abundance distributions must reflect the dynamic processes involved in community assembly, but whether and when specific processes lead to distinguishable signals is not well understood. Biodiversity and species abundances may be shaped by a variety of influences, but particular attention has been paid to competition, which can involve neutral dynamics, where competitor abundances are governed only by demographic stochasticity and immigration, and dynamics driven by trait differences that enable stable coexistence through the formation of niches. Key recent studies of the species abundance patterns of communities with niches employ simple models with pre-imposed niche structure. These studies suggest that species abundance distributions are insensitive to the relative contributions of niche and neutral processes, especially when diversity is much higher than the number of niches. Here we analyze results from a stochastic population model with competition driven by trait differences. With this model, niche structure emerges as clumps of species that persist along the trait axis, and leads to more substantial differences from neutral species abundance distributions than have been previously shown. We show that heterogeneity in between-niche interaction strength (i.e., in the strength of competition between species in different niches) plays the dominant role in shaping the species abundances along the trait axis, acting as a biotic filter favoring species at the centers of niches. Furthermore, we show that heterogeneity in within-niche interactions (i.e., in the competition between species in the same niche) counteracts the influence of heterogeneity in between-niche interactions on the SAD to some degree. Our results suggest that competitive interactions that produce niches can also influence the shapes of SADs.

  • 5.
    Rossberg, Axel G.
    et al.
    Queen Mary Univ London, England.
    Barabas, György
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten. Eotvos Lorand Univ, Hungary.
    How Carefully Executed Network Theory Informs Invasion Ecology2019Inngår i: Trends in Ecology & Evolution, ISSN 0169-5347, E-ISSN 1872-8383, Vol. 34, nr 5, s. 385-386Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    n/a

    Fulltekst tilgjengelig fra 2020-03-15 10:26
  • 6.
    Rossberg, Axel G.
    et al.
    Queen Mary Univ London, England; Int Initiat Theoret Ecol, England.
    Barabas, György
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten. ELTE MTA Theoret Biol and Evolutionary Ecol Res Grp, Hungary; Int Initiat Theoret Ecol, England.
    Possingham, Hugh P.
    Nature Conservancy, VA 22203 USA; Univ Queensland, Australia.
    Pascual, Mercedes
    Univ Chicago, IL 60637 USA; Santa Fe Inst, NM 87501 USA.
    Marquet, Pablo A.
    Pontificia Univ Catolica Chile, Chile.
    Hui, Cang
    Univ Stellenbosch, South Africa; African Inst Math Sci, South Africa.
    Evans, Matthew R.
    Univ Hong Kong, Peoples R China.
    Meszena, Geza
    ELTE MTA Theoret Biol and Evolutionary Ecol Res Grp, Hungary; Eotvos Lorand Univ, Hungary; Int Initiat Theoret Ecol, England.
    Lets Train More Theoretical Ecologists - Here Is Why2019Inngår i: Trends in Ecology & Evolution, ISSN 0169-5347, E-ISSN 1872-8383, Vol. 34, nr 9, s. 759-762Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    A tangled web of vicious circles, driven by cultural issues, has prevented ecology from growing strong theoretical roots. Now this hinders development of effective conservation policies. To overcome these barriers in view of urgent societal needs, we propose a global network of postgraduate theoretical training programs.

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