Frederic Bartumeus

Frederic Bartumeus
Spanish National Research Council | CSIC · Center for Advanced Studies of Blanes

PhD

About

151
Publications
26,523
Reads
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5,419
Citations
Additional affiliations
January 2014 - present
CREAF Centre for Ecological Research and Forestry Applications
Position
  • Research Associate
March 2006 - December 2009
Princeton University
Position
  • PostDoc Position

Publications

Publications (151)
Article
We investigate the dependence on the search space dimension of statistical properties of random searches with Lévy α-stable and power-law distributions of step lengths. We find that the probabilities to return to the last target found (P0) and to encounter faraway targets (PL), as well as the associated Shannon entropy S, behave as a function of α...
Article
Full-text available
The Mosquito Alert dataset includes occurrence records of adult mosquitoes collected worldwide in 2014–2020 through Mosquito Alert, a citizen science system for investigating and managing disease-carrying mosquitoes. Records are linked to citizen science-submitted photographs and validated by entomologists to determine the presence of five targeted...
Preprint
Full-text available
It is widely accepted that inverse square L\'evy walks are optimal search strategies because they maximize the encounter rate with sparse, randomly distributed, replenishable targets when the search restarts in the vicinity of the previously visited target, which becomes revisitable again with high probability, i.e., non-destructive foraging [Natur...
Article
Information on the relevant global scales of the search space, even if partial, should conceivably enhance the performance of random searches. Here we show numerically and analytically that the paradigmatic uninformed optimal Lévy searches can be outperformed by informed multiple-scale random searches in one (1D) and two (2D) dimensions, even when...
Article
Full-text available
Background Plant dispersal is a critical factor driving ecological responses to global changes. Knowledge on the mechanisms of dispersal is rapidly advancing, but selective pressures responsible for the evolution of dispersal strategies remain elusive. Recent advances in animal movement ecology identified general strategies that may optimize effici...
Preprint
Full-text available
Background – Plant dispersal is a critical factor driving ecological responses to global changes. Knowledge on the mechanisms of dispersal is rapidly advancing, but selective pressures responsible for the evolution of dispersal strategies remain elusive. Recent advances in animal movement ecology identified general strategies that may optimize effi...
Preprint
Full-text available
Background – Plant dispersal is a critical factor driving ecological responses to global changes. Knowledge on the mechanisms of dispersal is rapidly advancing, but selective pressures responsible for the evolution of dispersal strategies remain elusive. Recent advances in animal movement ecology identified general strategies that may optimize effi...
Article
Movement is fundamental to the animal ecology, determining how, when, and where an individual interacts with the environment. The animal dynamics is usually inferred from trajectory data described as a combination of moves and turns, which are generally influenced by the vast range of complex stochastic stimuli received by the individual as it move...
Article
Full-text available
How animals explore and acquire knowledge from the environment is a key question in movement ecology. For pollinators that feed on multiple small replenishing nectar resources, the challenge is to learn efficient foraging routes while dynamically acquiring spatial information about new resource locations. Here, we use the behavioural mapping t-Stoc...
Article
Full-text available
Abstract Dispersal is one of the main determining factors of population structure. In the marine habitat, well-connected populations with large numbers of reproducing individuals are common but even so population structure can exist on a small-scale. Variation in dispersal patterns between populations or over time is often associated to geographic...
Preprint
Full-text available
Larval dispersal determines #population structure in marine organisms but is hard to measure precisely. Thanks to a great collaboration, we are trying to go one step further to the very fine scale of dispersal patterns.
Preprint
We introduce an improved unsupervised clustering protocol specially suited for large-scale structured data. The protocol follows three steps: a dimensionality reduction of the data, a density estimation over the low dimensional representation of the data, and a final segmentation of the density landscape. For the dimensionality reduction step we in...
Chapter
Citizen science, the active participation of the public in scientific research projects, is a rapidly expanding field in open science and open innovation. It provides an integrated model of public knowledge production and engagement with science. As a growing worldwide phenomenon, it is invigorated by evolving new technologies that connect people e...
Article
Full-text available
Recent outbreaks of Zika, chikungunya and dengue highlight the importance of better understanding the spread of disease-carrying mosquitoes across multiple spatio-temporal scales. Traditional surveillance tools are limited by jurisdictional boundaries and cost constraints. Here we show how a scalable citizen science system can solve this problem by...
Article
Full-text available
Whereas the Asian tiger mosquito (Aedes albopictus) has low active dispersal capabilities, its worldwide colonization has been rapid. Indirect evidence and informal reports have long implicated passive transportation in cars, but this has not previously been studied systematically given the difficulties of real-time roadside surveys. Here we report...
Article
Full-text available
1. By modifying how critical ecosystem functions are distributed across the landscape, the spatial configuration and characteristics of patches can play a strong role in structuring communities. In strongly predator-controlled ecosystems, this patchy distribution of function can have complex downstream consequences, subjecting some areas to disprop...
Article
Full-text available
In order to survive and later recruit into a population, juvenile animals need to acquire resources through the use of innate and/or learnt behaviors in an environment new to them. For far-ranging marine species, such as the wandering albatross Diomedea exulans, this is particularly challenging as individuals need to be able to rapidly adapt and op...
Presentation
Full-text available
Passive acoustic telemetry is being widely used to study the movement of aquatic animals, and provides essential ecological information for species management and conservation. However, data from acoustic telemetry presents particular challenges for data analysis, especially if we aim to estimate the space use of individuals. As an example, many tr...
Poster
Full-text available
Marine protected areas (MPAs) are used as the main tool to confront the ecological impacts of overfishing, but in order to be effectively designed and managed, require accurate information on the biology and behaviour of targeted fish species. Here we used acoustic telemetry and novel analysis and visualization techniques to study the long-term mov...
Article
During immune surveillance, T cells survey the surface of antigen-presenting cells. In searching for peptide-loaded major histocompatibility complexes (pMHCs), they must solve a classic trade-off between speed and sensitivity. It has long been supposed that microvilli on T cells act as sensory organs to enable search, but their strategy has been un...
Article
Full-text available
A characterization of the thermal ecology of fishes is needed to better understand changes in ecosystems and species distributions arising from global warming. The movement of wild animals during changing environmental conditions provides essential information to help predict the future thermal response of large marine predators. We used acoustic t...
Article
Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or s...
Presentation
Full-text available
In this study, we assess how landscape attributes can potentially influence the first step of top-down control by modifying the distribution of predation on a keystone herbivore. We hypothesize that if control occurs at habitat scale, then certain landscape attributes can be more prone to predation than others. Additionally, if landscape attributes...
Article
Understanding the structural complexity and the main drivers of animal search behaviour is pivotal to foraging ecology. Yet, the role of uncertainty as a generative mechanism of movement patterns is poorly understood. Novel insights from search theory suggest that organisms should collect and assess new information from the environment by producing...
Article
Full-text available
It is important to account for the movement behaviour of fishes when designing effective marine protected areas (MPAs). Fish movements occur across different spatial and temporal scales and understanding the variety of movements is essential to make correct management decisions. This study describes in detail the movement patterns of an economicall...
Data
Results of the signal range-tests performed in the study site. The dots represent the mean (±SE) probability of tag detection at increasing distances from acoustic receivers. (PDF)
Data
Spatial chronogram plots for each tagged Diplodus sargus individual. (PDF)
Data
Distribution of phase-transition values (PT) calculated for the hourly reception number between consecutive day-night (A) and day-day (B) phases, for each Diplodus sargus individual. Lower and upper boundaries of the boxes represent the first and third quantiles of value distributions. Significant results of the Wilcoxon signed-rank tests against t...
Data
Supplementary Information: Active and reactive behaviour in human mobility: the influence of attraction points on pedestrians
Conference Paper
Full-text available
max 300 words) Following the spread of several infectious diseases, such as dengue, chikungunya and zika, concern is being expressed over the emergence of vector-borne viruses in new geographic locations. One of the vectors that has received particular attention in the last years is the mosquito. The Asian tiger mosquito (Aedes albopictus) and the...
Article
Full-text available
One key objective of the emerging discipline of movement ecology is to link animal movement patterns to underlying biological processes, including those operating at the neurobiological level. Nonetheless, little is known about the physiological basis of animal movement patterns, and the underlying search behaviour. Here we demonstrate the hallmark...
Data
Generating the Results with the EMbC R-package. (PDF)
Article
T cell migration is essential for T cell responses; it allows for the detection of cognate antigen at the surface of antigen-presenting cells and for interactions with other cells involved in the immune response. Although appearing random, growing evidence suggests that T cell motility patterns are strategic and governed by mechanisms that are opti...
Code
This is the codes used for all analysis in the paper Citizen Science Against Globalized Mosquito-Borne Diseases, by John R.B. Palmer, Aitana Oltra, Francisco Collantes, Juan Antonio Delgado, Javier Lucientes, Sarah Delacour, Mikel Bengoa, Roger Eritja, Mosquito Alert Community, and Frederic Bartumeus. The code relies on the data archived at: http:/...
Article
Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or s...
Article
Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or s...
Article
Full-text available
Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or s...
Article
Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or s...
Article
Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or s...
Article
Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or s...
Article
Full-text available
Human mobility is becoming an accessible field of study thanks to the progress and availability of tracking technologies as a common feature of smart phones. We describe an example of a scalable experiment exploiting these circumstances at a public, outdoor fair in Barcelona (Spain). Participants were tracked while wandering through an open space w...
Article
Full-text available
An important problem in the study of anomalous diffusion and transport concerns the proper analysis of trajectory data. The analysis and inference of Lévy walk patterns from empirical or simulated trajectories of particles in two and three-dimensional spaces (2D and 3D) is much more difficult than in 1D because path curvature is nonexistent in 1D b...
Article
Full-text available
An efficient searcher needs to balance properly the tradeoff between the exploration of new spatial areas and the exploitation of nearby resources, an idea which is at the core of scale-free L\'evy search strategies. Here we study multi-scale random walks as an approximation to the scale- free case and derive the exact expressions for their mean-fi...
Technical Report
Full-text available
In this document we give a brief overview on the use of the EMbC R-package with special emphasis on its use for behavioural annotation of animal's movement trajectories. For details about the EMbC algorithm please refer to (Garriga et. al 2015) and for further details about the package please refer to the package reference manual. 1 The EMbC Algori...
Article
Full-text available
Recently, Lévy walks have been put forward as a new paradigm for animal search and many cases have been made for its presence in nature. However, it remains debated whether Lévy walks are an inherent behavioural strategy or emerge from the animal reacting to its habitat. Here, we demonstrate signatures of Lévy behaviour in the search movement of mu...
Article
Full-text available
We present a new algorithm for behavioural annotation. The EMbC algorithm (Expectation-Maximization binary Clustering) is a variant of the Gaussian Mixture Model maximum likelihood estimation algorithm, also known as Expectation-Maximization Clustering. We focus on the analysis of two movement variables (velocity and turn) obtained from the success...
Article
Full-text available
The recent emergence in Europe of invasive mosquitoes and mosquito-borne disease associated with both invasive and native mosquito species has prompted intensified mosquito vector research in most European countries. Central to the efforts are mosquito monitoring and surveillance activities in order to assess the current species occurrence, distrib...
Article
Full-text available
A central question in movement research is how animals use information and movement to promote encounter success. Current random search theory identifies reorientation patterns as key to the compromise between optimizing encounters for both nearby and faraway targets, but how the balance between intrinsic motor programmes and previous environmental...
Article
Full-text available
A partir de los datos proporcionados por los ciudadanos sobre la posible presencia de mosquito tigre a través de la innovadora apli-cación Tigatrapp del proyecto AtrapaelTigre.com, se ratifica la presencia de esta especie invasora en el municipio de Alhaurín de la Torre (Málaga). Este trabajo representa la primera cita del vector potencial Aedes al...