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Introduction
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January 2008 - April 2013
Publications
Publications (151)
Habitat selection analysis includes resource selection analysis (RSA) and step selection analysis (SSA). These frameworks are used in order to understand space use of animals. Particularly, the SSA approach specifies the space availability of sequential locations through a movement kernel. This movement kernel is typically defined as the product of...
Tree species composition is known to influence forest productivity, but its effect on forest resilience to disturbances such as storms remains largely unexplored. Furthermore, climate is likely to influence forest resilience directly but also to influence the effect of tree species composition on resilience. In Europe, storm‐induced tree mortality...
Movement is a key aspect of amphibian ecology as the life cycle of many species involves seasonal dispersal and migration. However, there is still a lack of knowledge about how amphibians move across landscapes in relation to landscape structure and resource availability. Modern lightweight GPS loggers and associated statistical tools offer new per...
A standing challenge in the study of animal movement ecology is the capacity to predict where and when an individual animal might occur on the landscape, the so‐called, utilisation distribution (UD). Under certain assumptions, the steady‐state UD can be predicted from a fitted exponential habitat selection function. However, these assumptions are r...
Warmer and drier conditions increase forest mortality worldwide. At the same time, nitrogen deposition, longer growing seasons and higher atmospheric CO 2 concentrations may increase site productivity accelerating forest growth. However, tree physiological studies suggest that increased site productivity can also have adverse effects , reducing ada...
Forest stand densities are increasing in the boreal and temperate biomes, suggesting that tree‐tree competition is intensifying. Anticipating the consequences of this intensified competition is difficult because competition‐induced mortality may depend not only on the occurrence of extreme climatic events such as drought, but also on stand composit...
1. A standing challenge in the study of animal movement ecology is the capacity to predict where and when an individual animal might occur on the landscape, the so-called, Utilization Distribution (UD). Under certain assumptions, the steady-state UD can be predicted from a fitted exponential habitat selection function. However, these assumptions ar...
With climate change, natural disturbances such as storm or fire are reshuffled, inducing pervasive shifts in forest dynamics. To predict how it will impact forest structure and composition, it is crucial to understand how tree species differ in their sensitivity to disturbances. In this study, we investigated how functional traits and species mean...
Aim
Linking local population dynamics and species distributions is crucial to predicting the impacts of climate change. Although many studies focus on the mean fitness of populations, theory shows that species distributions can be shaped by demographic stochasticity or population resilience. Here, we examine how mean fitness (measured by invasion r...
Resource selection functions (RSFs) are among the most commonly used statistical tools in both basic and applied animal ecology. They are typically parameterized using animal tracking data, and advances in animal tracking technology have led to increasing levels of autocorrelation between locations in such data sets. Because RSFs assume that data a...
Calibrating process‐based models using multiple constraints often improves the identifiability of model parameters, helps to avoid several errors compensating each other and produces model predictions that are more consistent with underlying processes. However, using multiple constraints can lead to predictions for some variables getting worse. Thi...
Aim: Linking local population dynamics and species distributions is critical to predicting the impacts of climate change.
While many studies focus on the mean fitness of populations, theory shows that species distributions can be shaped by demographic
stochasticity or population resilience. Here we examine how mean fitness (measured by invasion rat...
Aim
The population processes that drive tree species distribution are still widely debated. We test the hypotheses that metapopulation processes of colonization and extinction are linked to predictions of species distribution models.
Location
Europe: Spain, France, Germany, Finland and Sweden.
Taxon
Angiosperms and Gymnosperms.
Methods
For 17 tr...
Community composition is a primary determinant of how biodiversity change influences ecosystem functioning and, therefore, the relationship between biodiversity and ecosystem functioning (BEF). We examine the consequences of community composition across six structurally realistic plant community models. We find that a positive correlation between s...
Community composition is a primary determinant of how biodiversity change influences ecosystem functioning and, therefore, the relationship between biodiversity and ecosystem functioning (BEF). We examine the consequences of community composition across six structurally realistic plant community models. We find that a positive correlation between s...
Invasive alien species are a growing threat for the environment and health. They also have a major economic impact, as they can damage many infrastructures. The Japanese knotweed (Fallopia japonica), present in North America, Northern and Central Europe as well as in Australia and New Zealand, is listed by the World Conservation Union as one of the...
Aim:
Presence records from surveys with spatially heterogeneous sampling intensity are a key challenge for species distribution models (SDMs). When sex groups differ in their habitat association, the correction of the spatial bias becomes important for preventing model predictions that are biased toward one sex. The objectives of this study were t...
Aim
Processes driving current tree species distribution are still largely debated. Attempts to relate species distribution and population demography metrics have shown mixed results. In this context, we would like to test the hypotheses that the metapopulation processes of colonization and extinction are linked to species distribution models.
Loca...
Cet article vise à présenter une démarche scientifique basée sur l'utilisation de modèles mathématiques pour répondre à une question écologique. Dans une première partie, nous décrivons la démarche générale en modélisation, et nous présentons différents modèles appliqués à la renouée du Japon ainsi que leurs apports. Ensuite, nous décrivons le modè...
Upland agricultural expansion and intensification cause soil erosion, which has a negative impact on the environment and socioeconomic factors by degrading the quality of both nutrient-rich surface soil and water. The Haean catchment is a well-known upland agricultural area in South Korea, which generates a large amount of sediment from its croplan...
Abstract Habitat suitability models (HSMs) are widely used to plan actions for species of conservation interest. Models that will be turned into conservation actions need predictors that are both ecologically pertinent and fit managers’ conceptual view of ecosystems. Remote sensing technologies such as light detection and ranging (LiDAR) can descri...
Models are pivotal for assessing future forest dynamics under the impacts of changing climate and management practices, incorporating representations of tree growth, mortality, and regeneration. Quantitative studies on the importance of mortality submodels are scarce. We evaluated 15 dynamic vegetation models (DVMs) regarding their sensitivity to d...
Invasive alien species are a growing threat for environment and health. They also have a major economic impact, as they can damage many infrastructures. The Japanese knotweed (Fallopia japonica), present in North America, Northern and Central Europe as well as in Australia and New Zealand, is listed by the World Conservation Union as one of the wor...
The relationship between resource availability and wildlife movement patterns is pivotal to understanding species behavior and ecology. Movement response to landscape variables occurs at multiple temporal scales, from sub‐diurnal to multiannual. Additionally, individuals may respond to both current and past conditions of resource availability. In t...
Les modèles permettront-ils prochainement d’aider les gestionnaires à optimiser leurs stratégies d’intervention sur le terrain pour freiner l’invasion par les renouées asiatiques ? C’est le pari que font les chercheurs d’Irstea en proposant un nouvel outil de modélisation qui permettra à terme de décrire la dynamique de croissance d’un massif de re...
In ecology, the true causal structure for a given problem is often not known, and several plausible models and thus model predictions exist. It has been claimed that using weighted averages of these models can reduce prediction error, as well as better reflect model selection uncertainty. These claims, however, are often demonstrated by isolated ex...
Restrictions on roaming
Until the past century or so, the movement of wild animals was relatively unrestricted, and their travels contributed substantially to ecological processes. As humans have increasingly altered natural habitats, natural animal movements have been restricted. Tucker et al. examined GPS locations for more than 50 species. In ge...
Many environmental data are inherently imbalanced, with some majority land use and land cover types dominating over rare ones. In cultivated ecosystems minority classes are often the target as they might indicate a beginning land use change. Most standard classifiers perform best on a balanced distribution of classes, and fail to detect minority cl...
Original spectral profiles.
The day of composite is the last day of a 16-day measurement period.
(PDF)
F-score, G-mean, precision and recall in 10 repetitions of scenarios S1 through S4.
(PDF)
Spectral profiles after filtering.
DOY is a day of the year derived from the true acquisition date through interpolation.
(PDF)
Patch density in the original data and in scenarios S1 through S4.
(PDF)
Weights derived from the quality flags in the “VI usefulness” layer of MOD13Q1.
(PDF)
Reclassification scheme for the original 67 LULC classes.
The 67 classes were combined to 14 classes and 6 classes containing more than 20 pixels were used in the study.
(PDF)
Distribution of training data in scenarios S1 through S4.
(PDF)
Mean confusion matrices in 10 repetitions in scenarios S1 through S4.
(PDF)
ROC summaries as median TPR and FPR in 10 repetitions of scenarios S1 through S4.
(PDF)
Evaluation of the maps with the largest F-score in scenarios S1 through S4.
(PDF)
Background: Biotelemetry offers an increasing set of tools to monitor animals. Acceleration sensors in particular can provide remote observations of animal behavior at high temporal resolution. While recent studies have demonstrated
the capability of this technique for a wide range of species and behaviors, a coherent methodology is still missing (...
In this paper, we present the Daily based Morgan-Morgan-Finney model. The main processes in this model are based on the Morgan-Morgan-Finney soil erosion model, and it is suitable for estimating surface runoff and sediment redistribution patterns in seasonal climate regions with complex surface configurations. We achieved temporal flexibility by ut...
Background and aimsSoil stability is a key ecosystem function provided by agricultural landscapes. A multitude of influential factors such as soil texture and plant community structure have been suggested, but few studies compare the relative importance of these factors for soil stability in the field. In addition, studies on effects of plant trait...
After persecution and a long period of extinction in parts of central Europe, the European wildcat is currently increasing its range, also to areas deemed unsuitable for this species. This range expansion facilitates close contact with domestic cats, which can reach high population densities even in protected areas. We provide unambiguous evidence...
Many environmental data are inherently imbalanced, with some majority land use and land cover types dominating over rare ones. In cultivated ecosystems minority classes are often the target as they might indicate a beginning land use change. Most standard classifiers perform best on a balanced distribution of classes, and fail to detect minority cl...
The Morgan-Morgan-Finney (MMF) model is a widely used semi-physically based soil erosion model which has been tested and validated in various land use types and climatic regions. The latest version of the model, the modified MMF model, improved its conceptual physical representations through several modifications of the original model. However, the...
Habitat selection can be considered as a hierarchical process in which animals satisfy their habitat requirements at different ecological scales. Theory predicts that spatial and temporal scales should co-vary in most ecological processes and that the most limiting factors should drive habitat selection at coarse ecological scales, but be less infl...
Existing global land use/land cover (LULC) raster maps have limited spatial and thematic resolution relative to the strong heterogeneity of agricultural landscapes. One promising approach to derive more informative maps is using fractional cover instead of hard classification. Here, we evaluate the effect of three key data processing options on the...
(1) Land-use intensification in agricultural landscapes has led to changes in the way habitats and resources are distributed in space. Pests and their natural enemies are influenced by these changes, and by the farming intensity of crop fields. However, it is unknown whether the composition of landscapes (amount and diversity of land cover types) o...
Most animals restrain their movement activities to familiar areas which leads to home ranges. Although understanding both establishment and shifts of home ranges is highly relevant for basic science and conservation, pinpointing the factors that shape the dynamics of home ranges remains a challenge. Evidently home ranges are influenced by the under...
Soil erosion is a widespread problem in agricultural landscapes, particularly in regions with strong rainfall events. Vegetated field margins can mitigate negative impacts of soil erosion by trapping eroded material. In this data set, we present data of sediment trapped by 12 field margins during the monsoon season of 2013 in an agricultural landsc...
The pantropical genus Ixora is highly diverse, with several species endemic to the Philippines. Owing to their endemic nature, many of these species are endangered and little is known about their basic biology. This study aimed to establish baseline information about the bioclimatic niches of Ixora species endemic to the Philippines, determine suit...
Aphids are a major concern in agricultural crops worldwide, and control by natural enemies is an essential component of the ecological intensification of agriculture. Although the complexity of agricultural landscapes is known to influence natural enemies of pests, few studies have measured the degree of pest control by different enemy guilds acros...
Effect of scale on the response of (A) average daily aphid population growth, (B) parasitism rates, (C) syrphid fractions
Sets of 95% confidence models and weights of each explanatory variable are shown for each response variable at scales from 100 to 1,000 m around fields. Lowest AIC values of the full model (not shown) and of the selected model (...
Multiple comparisons of slopes for (A) aphid population growth, (B) parasitism rate, (C) syrphid fraction measured at three sampling dates
This table shows the difference in slope between treatments, where slope is the effect of changes in % seminatural habitat around fields on response variables. Slopes are compared against zero (i.e., compared to...
Location of the Haean agricultural landscape (South Korea) and of 16 experimental cabbage plots
Location of the Haean agricultural landscape (South Korea) and of 16 experimental cabbage plots (red dots; 2 plots outside the catchment are not shown). Mean distance between fields was 3.2 ± 0.1 km (mean ± SE). Minimum distance was 211 m. See Statistics...
Effects of landscape complexity and management type of the nearest surrounding field on aphid population growth, in 6 natural enemy exclusion treatments and at 3 sampling dates (1–3) (n = 1,271)
Data points are given for each round and treatment. Each point represents one plant (i.e., sampling point). Four plants were sampled per exclusion treatmen...
Effects of including initial aphid density on model results for aphid population growth, parasitism rate and syrphid fractions
Results without this factor are shown in Table 1 (see Methods §4 and Table 1 for details on the model selection procedure). Sets of 95% confidence models and weights of each predictor are given for all response variables. w...
Design of the exclosure experiment in each of 18 plots (modified from Martin et al., 2013)
Exclosures are shown in a lateral view. Each exclosure contained four cabbages and was dug 10-20 cm into the ground. The same number of aphids was deposited on all plants of a given plot. Treatments are: O, open treatment, no exclusion; -B, exclusion of birds...
Effects of landscape complexity and management type of the nearest surrounding field on aphid parasitism rate, in 6 natural enemy exclusion treatments and at 3 sampling dates (1–3) (n = 1,271)
Data points are given for each date and treatment. The area of each symbol is proportional to the total number of (parasitized + non-parasitized) aphids in t...
Effects of landscape complexity and management type of the nearest surrounding field on syrphid fractions, in 6 natural enemy exclusion treatments and at 3 sampling dates (1–3) (n = 1,271)
Data points are given for each date and treatment. The area of each symbol is proportional to the total number of syrphids + aphids in the corresponding fraction...
QuestionsAt what spatial scales do plant species with different dispersal potentials respond to landscape characteristics? Do seed rain data support these scale-dependent responses? Does the relative importance of local factors and surrounding landscape characteristics vary according to species dispersal potential? LocationAgricultural landscape, J...
The Bohemian Forest Ecosystem encompasses various wildlife management systems. Two large, contiguous national parks (one in Germany and one in the Czech Republic) form the centre of the area, are surrounded by private hunting grounds, and hunting regulations in each country differ. Here we aimed at unravelling the influence of management-related an...
Background: Positive plant–plant interactions similar to specialised plant growth forms are potential strategies to overcome the environmental harshness of Afro-alpine ecosystems. However, knowledge about plant–plant interactions is limited for African alpine regions.
Aims: We investigated the ameliorative effect of the densely leaved dwarf shrub...
Linking animal movements to landscape features is critical to identify factors that shape the spatial behaviour of animals. Habitat selection is led by behavioural decisions and is shaped by the environment, therefore the landscape is crucial for the analysis. Land cover classification based on ground survey and remote sensing data sets are an esta...
