Density-dependent dispersal and relative dispersal affect the stability of predator–prey metacommunities

Hauzy, Céline; Gauduchon, Mathias; Hulot, Florence D.; Loreau, Michel

doi:10.1016/j.jtbi.2010.07.008

Cited by 47 publications

(39 citation statements)

References 48 publications

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“…Even more importantly, our analysis shows how metacommunities can be destabilized by the interplay between several common properties (prey movement, predator avoidance, and travel time) when none of these properties is destabilizing on its own (Hauzy et al 2010). Our specific predictions suggest that such destabilization could be observed in systems where frequent prey movement in response to predators is associated with long travel time.…”

Section: Density-dependent Dispersal and Timescales Of Movementmentioning

confidence: 81%

“…Our understanding of the effects of movement in spatially coupled communities on their stability is much less developed, but some principles have emerged in recent years. Movement between identical patches, either as density-independent dispersal (Jansen 1995) or as a density-dependent behavioral response (Hauzy et al 2010), does not change the stability of the community on a single patch, as long as movement is instantaneous. Including movement time across a landscape in simple density-independent dispersal models may stabilize local populations, but never destabilizes local stable communities (Neubert et al 2002;Klepac et al 2007).…”

Section: Discussionmentioning

confidence: 99%

“…When movement between patches is instantaneous, i.e., τ = 0, our model is a special case of the model in Hauzy et al (2010). Those authors showed that then the coexistence equilibrium (h * , p * , h * , p * ) of Eq.…”

Section: The Modelmentioning

confidence: 97%

“…Our specific predictions suggest that such destabilization could be observed in systems where frequent prey movement in response to predators is associated with long travel time. The effects of densitydependent dispersal and travel time are not only limited to community stability, but they also extend to the dynamics of nonequilibrium communities (Ramanantoanina et al 2011). Hauzy et al (2010 demonstrate that density-dependent dispersal can shift periodic to chaotic behavior.…”

Section: Density-dependent Dispersal and Timescales Of Movementmentioning

confidence: 99%

“…Rosenzweig and MacArthur (1963) showed how such a simple ecological community can switch from stable equilibrium to stable limit cycles in response to increased carrying capacity of the prey (i.e., the paradox of enrichment). This simple model has generated a large body of literature on the role of individual movement as a stabilizing mechanism in simple two-patch systems, as well as spatially explicit models (Briggs and Hoopes 2004;Cantrell and Cosner 1996;Hauzy et al 2010;Jansen 2001;Ramanantoanina et al 2011). The most general analyses of such models result from the assumption of random and instantaneous movement of individuals between homogeneous locations.…”

Section: Introductionmentioning

confidence: 99%

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The effect of predator avoidance and travel time delay on the stability of predator-prey metacommunities

2015

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The stability conditions for an isolated specialist predator-prey community are fairly well understood. The spatial coupling of several such systems through dispersal of individuals can generate new dynamic behavior that is not yet completely understood. Many factors are known to be stabilizing or neutral, e.g., random dispersal or time delays, while others may induce instabilities in some cases but not others, e.g., density-dependent movement. We study the combination of two stabilizing mechanisms in a two-patch Rosenzweig-MacArthur model with a novel density-dependent movement term. Specifically, we assume that prey move between patches according to their perceived predation risk, and we include travel time between patches as a time delay. We show that the combination of mechanisms may be destabilizing even though each mechanism by itself is stabilizing. Our results show that a detailed knowledge of mechanisms and their temporal scales is necessary to correctly predict the stability of a metacommunity.

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Section: Density-dependent Dispersal and Timescales Of Movementmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 97%

Section: Density-dependent Dispersal and Timescales Of Movementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of predator avoidance and travel time delay on the stability of predator-prey metacommunities

2015

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Flexible habitat choice of pelagic bacteria increases system stability and energy flow through the microbial loop

Villalba

Karnatak

Grossart

et al. 2022

Limnology & Oceanography

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Pelagic bacteria can be classified into free‐living and particle‐attached life modes, which either dwell in the water column or attach to suspended particles. Bacteria with a generalist life style, however, can actively shift between these two habitats. Globally increasing densities of natural and artificial particles enhance habitat heterogeneity, with potential consequences for system stability and trophic transfer through aquatic food webs. To better decipher the dynamics of microbial communities, we investigated the influence of adaptive vs. fixed habitat choice on species coexistence for a simplified bacterial community by analyzing a corresponding food web model, consisting of two specialist bacterial prey species (free and attached), a generalist bacterial prey species with the ability to shift between both habitats, and two protist predators, specialized on either water or particle compartment. For simplicity we assume a shared resource pool, considering particles only for colonization but not as a source for nutrients or carbon, that is, inert particles like microplastics or inorganic sediments. The model predicts coexistence on a cyclic attractor between fixed and flexible bacteria, if the costs for adaptive habitat choice can be balanced by adaptation speed. The presence of adaptive prey dampens predator–prey cycle amplitudes, contributing to system stabilization resulting in higher mean predator biomass compared to specialist prey only. Thus, in pelagic microbial systems, flexible habitat choice at the prey level has important implications for system stability and magnitude of energy flow through the microbial loop.

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Ontogenetic niche shifts matter in community ecology: a review and future perspectives

2014

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Almost all organisms on Earth exhibit ontogenetic niche shifts, which causes great phenotypic variation among individuals and is thus considered to critically mediate community structure and dynamics. In contrast, community ecology has traditionally assumed that species are composed of identical individuals with invariant traits and ignored the potentially important ecological roles of ontogenetic niche shifts. To bridge the gap, here I briefly review ecologically relevant examples which show that basic insights of species‐based community theories can be revised by including the ontogenetic perspective. Specifically, I focus on the most representative animals in the study of ontogenetic niche shifts, i.e., fish, insects, and amphibians. Notably, their ontogenetic niche shifts create novel views of community structure: (1) ontogenetic diet shifts of predatory fish couple pelagic and benthic food webs in aquatic systems, (2) ontogenetic shifts in interaction types of pollinating insects couple herbivory and pollination networks in terrestrial systems, and (3) ontogenetic habitat shifts of amphibians and aquatic insects couple aquatic and terrestrial metacommunities at interface areas. Dynamic models of such stage‐structured communities suggest that their ontogenetic niche shifts may affect the community resilience and disturbance responses. Exploring more complex systems (e.g., where many species undergo ontogenetic niche shifts several times or continuously) is a future direction, for which describing body size relationships between interacting organisms would be a promising approach. I conclude that both theoretical and empirical advances are needed to facilitate the ontogenetic perspective for better understanding mechanisms underlying biodiversity and ecosystem functioning which are increasingly threatened by anthropogenic disturbance.

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Density-dependent dispersal and relative dispersal affect the stability of predator–prey metacommunities

Cited by 47 publications

References 48 publications

The effect of predator avoidance and travel time delay on the stability of predator-prey metacommunities

The effect of predator avoidance and travel time delay on the stability of predator-prey metacommunities

Flexible habitat choice of pelagic bacteria increases system stability and energy flow through the microbial loop

Ontogenetic niche shifts matter in community ecology: a review and future perspectives

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