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- Francesco d’Ovidio, Vicente Fernández, Emilio Hernández-Garćıa, Cristóbal López
- 2004

We characterize horizontal mixing and transport structures in the surface circulation of the Mediterranean Sea, as obtained from a primitive equation circulation model. We calculate the Finite Size Lyapunov Exponents (FSLEs) of the velocity data set, which gives a direct measure of the local stirring. By proper election of the FSLE parameters, we focus on… (More)

- Simone Pigolotti, Cristóbal López, Emilio Hernández-García
- Physical review letters
- 2007

We study the properties of general Lotka-Volterra models with competitive interactions. The intensity of the competition depends on the position of species in an abstract niche space through an interaction kernel. We show analytically and numerically that the properties of these models change dramatically when the Fourier transform of this kernel is not… (More)

- S Berti, C López, D Vergni, A Vulpiani
- Physical review. E, Statistical, nonlinear, and…
- 2007

An autocatalytic reacting system with particles interacting at a finite distance is studied. We investigate the effects of the discrete-particle character of the model on properties like reaction rate, quenching phenomenon, and front propagation, focusing on differences with respect to the continuous case. We introduce a renormalized reaction rate depending… (More)

- Simone Pigolotti, Cristóbal López, Emilio Hernández-García, Ken H. Andersen
- Theoretical Ecology
- 2009

A central model in theoretical ecology considers the competition of a range of species for a broad spectrum of resources. Recent studies have shown that essentially two different outcomes are possible. Either the species surviving competition are more or less uniformly distributed over the resource spectrum, or their distribution is “lumped” (or “clumped”),… (More)

- Emilio Hernández-García, Cristóbal López, Simone Pigolotti, Ken H. Andersen
- Philosophical transactions. Series A…
- 2009

We present properties of Lotka-Volterra equations describing ecological competition among a large number of interacting species. First we extend previous stability conditions to the case of a non-homogeneous niche space, i.e. that of a carrying capacity depending on the species trait. Second, we discuss mechanisms leading to species clustering and obtain an… (More)

- Emilio Hernández-García, Cristóbal López
- Physical review. E, Statistical, nonlinear, and…
- 2004

We introduce a simple model of population dynamics which considers reproducing individuals or particles with birth and death rates depending on the number of other individuals in their neighborhood. The model shows an inhomogeneous quasistationary pattern with many different clusters of particles arranged periodically in space. We derive the equation for… (More)

- Justin M Calabrese, Federico Vazquez, Cristóbal López, Maxi San Miguel, Volker Grimm
- The American naturalist
- 2010

Savanna ecosystems are widespread and economically important and harbor considerable biodiversity. Despite extensive study, the mechanisms regulating savanna tree populations are not well understood. Recent empirical work suggests that both tree-tree competition and fire are key factors in semiarid to mesic savannas, but the potential for competition to… (More)

- Zoltán Neufeld, Cristóbal López, Emilio Hernández-Garćıa
- 2000

Zoltán Neufeld, Cristóbal López, Emilio Hernández-Garćıa, and Tamás Tél Instituto Mediterráneo de Estudios Avanzados IMEDEA CSIC-Universitat de les Illes Balears, E-07071 Palma de Mallorca, Spain Department of Applied Mathematics and Theoretical Physics, University of Cambridge Silver Street, Cambridge CB3 9EW, UK Eötvös University, Department of… (More)

- Francisco Ramos, Cristóbal López, Emilio Hernández-García, Miguel A Muñoz
- Physical review. E, Statistical, nonlinear, and…
- 2008

Motivated by the existence of remarkably ordered cluster arrays of bacteria colonies growing in Petri dishes and related problems, we study the spontaneous emergence of clustering and patterns in a simple nonequilibrium system: the individual-based interacting Brownian bug model. We map this discrete model into a continuous Langevin equation which is the… (More)

We consider a predator-prey model of planktonic population dynamics, of excitable character, living in an open and chaotic fluid flow, i.e., a state of fluid motion in which fluid trajectories are unbounded but a chaotic region exists that is restricted to a localized area. Despite that excitability is a transient phenomenon and that fluid trajectories are… (More)