Changes in environmental conditions can impose stress that alters the structure and function of communities. However, ecologists are only starting to explore how stress can interact with dispersal. In this study, we tested how dispersal affects the structure, diversity (evenness), and function (productivity) of marine diatom communities (Bacillariophyceae)… (More)
Environmental stress changes the relationship between biodiversity and ecosystem functions, but the underlying mechanisms are poorly understood. Because species interactions shape biodiversity-ecosystem functioning relationships, changes in per capita interactions under stress (as predicted by the stress gradient hypothesis) can be an important driver of… (More)
Studies of food webs suggest that limited nonrandom dispersal can play an important role in structuring food webs. It is not clear, however, whether density-dependent dispersal fits empirical patterns of food webs better than density-independent dispersal. Here, we study a spatially distributed food web, using a series of population-dispersal models that… (More)
Rpackage ToxLim (De˜Laender and Soetaert 2010) contains the OMEGA model to estimate the estimates the bioaccumulation of a nonbiotransforming chemical through a food web. It also contains several food web examples. The methodology was described in the paper by (De˜Laender, Van˜Oevelen, Middel-burg, and Soetaert 2009). Please cite this paper when using this… (More)
Description Functions that predict internal concentrations of hydrophobic chemicals in aquatic organisms.
The ecotoxicity of binary chemical mixtures with a common mode of action is often predicted with the concentration addition model. The assumption of concentration addition is commonly tested statistically based on results of toxicity experiments with the two single chemicals and their binary mixture. The present simulation study shows that if not all these… (More)
The authors describe their experience with thermography in the study of the permeability of Holter's ventriculo-atrial shunt. Thermography has the advantage of permitting immediate visualisation and photographic documentation of the permeability. It appears that the thermographic findings show a good correlation with the functional state of the shunt in 88%… (More)