Charles N De Santana

University of Zurich | UZH · Institut für Evolutionsbiologie und Umweltwissenschaften

Predictions from theory, field data, and experiments have shown that high landscape connectivity promotes higher species richness than low connectivity. However, examples demonstrating high diversity in low connected landscapes also exist. Here we describe the many factors that drive landscape connectivity at different spatiotemporal scales by vary...

This work shows that graph theory provides a framework to quantify the behavior of the time-correlation function among precipitation records within a given region. The method amounts to consider each station, where one data series was recorded, as a vertex in the graph. An edge, characterized by its geodesic distance d, is inserted between any pair...

This paper proposes a new method to identify communities in generally weighted complex networks and apply it to phylogenetic analysis. In this case, weights correspond to the similarity indexes among protein sequences, which can be used for network construction so that the network structure can be analyzed to recover phylogenetically useful informa...

In this study, the Hybrid Coordinate Ocean Model (HYCOM) has been tested for the Atlantic Basin in order to produce forecasts of ocean state variables for the South Atlantic and the South America coastal region. Initially, the model was run for a 30-year period forced with COADS climatological atmospheric fields in order to produce a climatological...

Biodiversity can increase in both high‐ and low‐connected landscapes. However, we lack predictions related to biodiversity dynamics when accounting for the temporal heterogeneity in the connections among the habitats of a landscape. Here, we study the relationship between fluctuations in landscape connectivity and biodiversity dynamics at local and...

Aim Ecological gradients are expected to be associated with structural rewiring of species interaction networks. The study of network structures along geographic and ecological gradients, however, remains marginal because documenting species interactions at multiple sites is a methodological challenge. Here, we aimed to study the structural variati...

In the last decade, machine learning has been widely used in different fields, especially because of its capacity to work with complex data. With the support of machine learning techniques, different studies have been using data-driven approaches to better understand some syndromes like mild cognitive impairment, Alzheimer’s disease, schizophrenia,...

Chronic pain is known as a complex disease due to its comorbidities with other symptoms and the lack of effective treatments. As a consequence, chronic pain seems to be under-diagnosed in more than 75% of patients. At the same time, the advance in brain imaging, the popularization of machine learning techniques and the development of new diagnostic...

Aim The summits of mountain ranges at mid‐latitude in the Northern Hemisphere share many ecological properties with the Arctic, including comparable climates and similar flora. We hypothesize that the orogeny during the Oligocene‐Miocene combined with global cooling led to the origin and early diversification of cold‐adapted plant lineages in these...

Spatial dependency and spatial embedding are basic physical properties of many phenomena modeled by networks. The most indicated computational environment to deal with spatial information is to use Georeferenced Information System (GIS) and Geographical Database Management Systems (GDBMS). Several models have been proposed in this direction, howeve...

Fibromyalgia is a common chronic pain condition that exerts a considerable impact on patients' daily activities and quality of life. Objectives: The main objective of the present study was to evaluate kinematic parameters of gait, functional performance, and balance in women with fibromyalgia syndrome. Methods: The study included 26 female patients...

Speculation over a global rise in jellyfish populations has become widespread in the scientific literature, but until recently the purported 'global increase' had not been tested. Here we present a citation analysis of peer-reviewed literature to track the evolution of the current perception of increases in jellyfish and identify key papers involve...

Speculation over a global rise in jellyfish populations has become widespread in the scientific literature, but until recently the purported 'global increase' had not been tested. Here we present a citation analysis of peer-reviewed literature to track the evolution of the current perception of increases in jellyfish and identify key papers involve...

Speculation over a global rise in jellyfish populations has become widespread in the scientific literature, but until recently the purported 'global increase' had not been tested. Here we present a citation analysis of peer-reviewed literature to track the evolution of the current perception of increases in jellyfish and identify key papers involve...

The Cretaceous breakup of Gondwana strongly modified the global distribution of shallow tropical seas reshaping the geographic configuration of marine basins. However, the links between tropical reef availability, plate tectonic processes and marine biodiversity distribution patterns are still unknown. Here, we show that a spatial diversification m...

The SIB Swiss Institute of Bioinformatics (www.isb-sib.ch) provides world-class bioinformatics databases, software tools, services and training to the international life science community in academia and industry. These solutions allow life scientists to turn the exponentially growing amount of data into knowledge. Here, we provide an overview of S...

Mean annual temperatures of the Arctic Ocean and Antarctic Peninsula are warming much faster than global mean warming rates, which will likely result in significant biological impacts. Whereas most assessments have been made on individual species, impacts may differ when entire ecosystems are considered, as effects may propagate through ecological...

Bacterial endophytes are crucial for the survival of many terrestrial plants, but little is known about the presence and importance of bacterial endophytes of marine plants. We conducted a survey of the endophytic bacterial community of the long-living Mediterranean marine angiosperm Posidonia oceanica in surface-sterilized tissues (roots, rhizomes...

Behavior of the size of the largest connected component Nc as function of p for ER networks G(N,p). As in Fig. S7, for any value of N, p is restricted to the interval [0,5pc = 5/N], while solid and dashed lines indicate average and single sample behavior. For both values of N, the values of Nc at pc are close to the expected value (Nc(pc)≈N2/3). Ho...

The distance δ(σ,σ+Δ σ) between networks for successive similarities at the maximal value in the case of: a) Gluco at σ = σmax = 40%; b) Hexo at σ = σmax = 37%; c) Phospho at σ = σmax = 37%. (0.25 MB TIF)

The dendrogram associated with the elimination of links with largest value of betweeness in the case of: a) Gluco at σ = σmax = 40%; b) Hexo at σ = σmax = 37%; c) Phospho at σ = σmax = 37%. (0.38 MB TIF)

The neighborhood matrix with the communities for: a) Gluco at σ = σmax = 40%; b) Hexo at σ = σmax = 37%; c) Phospho at σ = σmax = 37%. The presence of other high peaks for the Gluco network shown in Fig.S2a indicates that the complete separation of communities C1 and C2, and C3 and C4 is achieved only at σ = 50%. (2.18 MB TIF)

Supplementary material for the paper “Detecting Network Communities: An Application to Phylogenetic Analysis.” (0.03 MB DOC)

Graphs of δ(p,p+Δp) as function of p for N-nodes ER networks (G(N,p)), where p indicates the probability of introducing an edge between any pair of nodes. For the sake of a better comparison, p is restricted to the interval [0,5pc = 5/N] for any value of N. The solid line indicates the average behavior (10 samples when N = 256 (a), and 3 samples wh...

The size of the largest cluster (Nc) versus the threshold similarity σ: a) Gluco; b) Hexo; c) Phospho. (0.16 MB TIF)

The standard representation of each enzyme network (using the Pajek package) displaying the communities that were indicated in Fig. 4a, 4b and 4c respectively: a) Gluco at σ = σmax = 40%; b) Hexo at σ = σmax = 37%; c) Phospho at σ = σmax = 37%. One extra label has been added in each panel to denote the set of isolated nodes and small sub-graphs. No...

Same as in Fig. 6 of the published material, but the horizontal axis has been expanded for the sake of a better visualization. Color codes and network order is the same as in the published material. (1.76 MB TIF)

This paper is in Portuguese. This work uses the theory of complex networks to analyze the dynamics of rainfall in Northeast Brazil. Using time sequence records of 201 rainfall stations in Northeast Brazil, we generate a set of networks representing the relationships among them. By characterizing the growth of these networks we have important inform...

Desertification is the loss of the soil capacity caused by human actions that become aggravating forward to the changes. The state of Bahia has more than 300 thousand square kilometers of area vulnerable to desertification. It was selected the municipality of Jeremoabo as area of study aimed to identify areas susceptible to desertification, taking...