Towards a predictive model of species interaction beta diversity

Graham, Catherine H.

doi:10.1111/ele.13084

Cited by 36 publications

(32 citation statements)

References 102 publications

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“…(Our results also hold when A ij,u and A ji,u are correlated, see S1 Text (Appendix F).) For a given species pair, its interactions A ij,u vary somewhat with u; this variability corresponds to small differences in the conditions between the patches [23]. In the simulation examples we set all carrying capacities B i,u = 1; the phenomena described below are also found if B i,u vary between patches in addition to, or instead of the interaction coefficients.…”

Section: Proposed Experimentsmentioning

confidence: 99%

Complex interactions can create persistent fluctuations in high-diversity ecosystems

et al. 2020

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When can ecological interactions drive an entire ecosystem into a persistent non-equilibrium state, where many species populations fluctuate without going to extinction? We show that high-diversity spatially heterogeneous systems can exhibit chaotic dynamics which persist for extremely long times. We develop a theoretical framework, based on dynamical meanfield theory, to quantify the conditions under which these fluctuating states exist, and predict their properties. We uncover parallels with the persistence of externally-perturbed ecosystems, such as the role of perturbation strength, synchrony and correlation time. But uniquely to endogenous fluctuations, these properties arise from the species dynamics themselves, creating feedback loops between perturbation and response. A key result is that fluctuation amplitude and species diversity are tightly linked: in particular, fluctuations enable dramatically more species to coexist than at equilibrium in the very same system. Our findings highlight crucial differences between well-mixed and spatially-extended systems, with implications for experiments and their ability to reproduce natural dynamics. They shed light on the maintenance of biodiversity, and the strength and synchrony of fluctuations observed in natural systems.

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Section: Proposed Experimentsmentioning

confidence: 99%

Complex interactions can create persistent fluctuations in high-diversity ecosystems

et al. 2020

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“…Interaction -diversity represents differences in the set of observed interactions between sites (Poisot et al 2012, Graham andWeinstein 2018). Whole-network dissimilarity ( ) between two sites can be partitioned into that attributable to species not being present at both sites ( ) and that attributable to interactions only occurring at one site despite both species being present at both ( ).…”

Section: Drivers Of Interaction Turnovermentioning

confidence: 99%

Molecular analyses reveal consistent food web structure with elevation in rainforestDrosophila- parasitoid communities

Jeffs

Terry

Higgie

et al. 2020

Preprint

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The analysis of interaction networks across spatial environmental gradients is a powerful approach to investigate the responses of communities to global change. Using a combination of DNA metabarcoding and traditional molecular methods we built bipartite Drosophila-parasitoid food webs from six Australian rainforest sites across gradients spanning 850 m in elevation and 5° Celsius in mean temperature. Our cost-effective hierarchical approach to network reconstruction separated the determination of host frequencies from the detection and quantification of interactions. The food webs comprised 5-9 host and 5-11 parasitoid species at each site, and showed a lower incidence of parasitism at high elevation. Despite considerable turnover in the relative abundance of host Drosophila species, and contrary to some previous results, fundamental metrics of network structure including nestedness and specialisation did not change significantly with elevation. Advances in community ecology depend on data from a combination of methodological approaches. It is therefore especially valuable to develop model study systems for sets of closely-interacting species that are diverse enough to be representative, yet still amenable to field and laboratory experiments.

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“…they belong to the same trophic level), meaning that A ij,u are sampled independently 2 and identically for different (i, j). For a given species pair, its interactions A ij,u vary somewhat with u; this variability corresponds to small differences in the conditions between the patches [16]. In the simulation examples we set all carrying capacities B i,u = 1; the phenomena described below are also found if B i,u vary between patches in addition to, or instead of the interaction coefficients.…”

Section: Proposed Experimentsmentioning

confidence: 99%

Can endogenous fluctuations persist in high-diversity ecosystems?

Roy

Barbier

Biroli

et al. 2019

Preprint

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When can complex ecological interactions drive an entire ecosystem into a persistent nonequilibrium state, where species abundances keep fluctuating without going to extinction? We show that high-diversity spatially-extended systems, in which conditions vary somewhat between spatial locations, can exhibit chaotic dynamics which persist for extremely long times. We develop a theoretical framework, based on dynamical mean-field theory, to quantify the conditions under which these fluctuating states exist, and predict their properties. We uncover parallels with the persistence of externally-perturbed ecosystems, such as the role of perturbation strength, synchrony and correlation time. But uniquely to endogenous fluctuations, these properties arise from the species dynamics themselves, creating feedback loops between perturbation and response. A key result is that the fluctuation amplitude and species diversity are tightly linked, in particular fluctuations enable dramatically more species to coexist than at equilibrium in the very same system. Our findings highlight crucial differences between well-mixed and spatially-extended systems, with implications for experiments and their ability to reproduce natural dynamics. They shed light on the maintenance of biodiversity, and the strength and synchrony of fluctuations observed in natural systems.

show abstract

Towards a predictive model of species interaction beta diversity

Cited by 36 publications

References 102 publications

Complex interactions can create persistent fluctuations in high-diversity ecosystems

Complex interactions can create persistent fluctuations in high-diversity ecosystems

Molecular analyses reveal consistent food web structure with elevation in rainforestDrosophila- parasitoid communities

Can endogenous fluctuations persist in high-diversity ecosystems?

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