Romain Julliard

Romain Julliard
Muséum National d'Histoire Naturelle · Département Écologie et Gestion de la Biodiversité

About

227
Publications
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Publications

Publications (227)
Article
Pollination is essential for many crops since 70% of the world's cultivated plants depend on pollinators for their production. Floral resources within cultivated areas, especially those produced by flowering crops such as oilseed rape, are known to have a positive effect on wild pollinators. Nevertheless, little is known about the contribution of o...
Chapter
This chapter assesses the feasibility of using natural history collections to trace temporal changes in species distribution and community composition using the example of macroalgae that are preserved as herbaria. The preservation of plants in herbaria began during the Renaissance. This technique required paper and became widespread in the 18th ce...
Presentation
Conservationists have identified global biodiversity hotspots that are both important for biodiversity and heavily affected by anthropogenic pressures, and, within these regions, Key Biodiversity Areas (KBAs) i.e. sites where priority conservation measures should be implemented. However, in a context of global change, it is also crucial to target s...
Chapter
Les collections naturalistes ont désormais acquis une place inédite dans la recherche scientifique. Constituées à l’origine par la systématique et la taxonomie, elles se révèlent aujourd’hui fondamentales pour répondre à diverses questions scientifiques et sociétales, aussi importantes qu’actuelles.Les collections naturalistes dans la science du XX...
Article
The goal of the mitigation hierarchy is to counteract the losses of biodiversity due to development projects by avoiding, reducing and as a last resort, by offsetting these losses. However, the implementation of offset measures is currently very unsatisfactory from a biodiversity perspective, and many development projects do not incorporate them. H...
Article
In the recent years, several citizen science platforms for biodiversity monitoring have emerged. These platforms represent a powerful tool for collecting biodiversity data for researchers and increasing the knowledge of participants. Typical biodiversity data are species names observed at a given time and place by numerous participants. The use of...
Article
The European Union's Natura 2000 (N2000) is among the largest international networks of protected areas. One of its aims is to secure the status of a predetermined set of (targeted) bird and butterfly species. However, nontarget species may also benefit from N2000. We evaluated how the terrestrial component of this network affects the abundance of...
Article
Full-text available
Citizen science has become a mainstream approach for collecting data on biodiversity. However, not all biodiversity monitoring programs achieve the goal of collecting datasets that can be used in robust scientific inquiries. Data quality and the capacity to engage participants in the long-term are the most challenging issues. We compared two method...
Article
This addendum is motivated by criticisms of the concerned paper by wind developers who raised a potential altitude bias, wind turbines being most often positioned higher than their surrounding environment. Despite altitude vary very little in the study area, we believed it was valuable to control for this potential confounding effect and thus to en...
Article
1.Assessing the state and trend of biodiversity in the face of anthropogenic threats requires large‐scale and long‐time monitoring, for which new recording methods offer interesting possibilities. Reduced costs and a huge increase in storage capacity of acoustic recorders has resulted in an exponential use of Passive Acoustic Monitoring (PAM) on a...
Article
Full-text available
Changes in species concepts and the rapid advances in DNA-based taxonomy and phylogeny of the past decades have led to increasing splits of single species into several new species. The consequences of such splits include the delineation of post-split species that may have restricted ranges and potentially increased extinction risks. Species splitti...
Article
Full-text available
Biodiversity is being lost at an unprecedented rate, and monitoring is crucial for understanding the causal drivers and assessing solutions. Most biodiversity monitoring data are collected by volunteers through citizen science projects, and often crucial information is lacking to account for the inevitable biases that observers introduce during dat...
Article
Wind energy is rapidly growing as a renewable source of energy but is not neutral for wildlife, especially bats. Whereas most studies have focused on bat mortality through collision, very few have quantified the loss of habitat use resulting from the potential negative impact of wind turbines, and none of them for hub heights higher than 55 m. Such...
Conference Paper
Full-text available
The Natura 2000 network (N2000) is currently the largest coordinated network of protected areas in the world, and focuses on the conservation of most valuable and threatened species and habitats in Europe. Although there has been several assessments of N2000, few studies have looked at the long-term effect of this protection network on biodiversity...
Preprint
Full-text available
While many observations of species are being collected by citizen science projects worldwide, it can be challenging to identify projects collecting data that effectively monitor biodiversity. Over the past several years the allure of taking a big data approach has provided the opportunity to gather massive quantities of observations via the Interne...
Article
A contribution by Wilson and colleagues (2017) pointed out a lack of basic knowledge on bee diversity in the general public, this despite massive worldwide support to protect these charismatic organisms. Such discrepancy may hinder conservation efforts. Promoting knowledge on pollinator diversity in the general public is challenging given the thous...
Article
Full-text available
Survey techniques available to sample mammals have multiplied during the last decades. They offer new opportunities for sampling and monitoring populations, but before widespread use they need to be validated and calibrated to more traditional approaches. We conducted a quantitative assessment of hair tubes designed to monitor common small mammals...
Article
Full-text available
The increased use of pesticides and tillage intensification is known to negatively affect biodiversity. Changes in these agricultural practices such as herbicide and tillage reduction have variable effects among taxa, especially at the top of the trophic network including insectivorous bats. Very few studies compared the effects of agricultural pra...
Article
Full-text available
Body size is implicated in individual fitness and population dynamics. Mounting interest is being given to the effects of environmental change on body size, but the underlying mechanisms are poorly understood. We tested whether body size and body condition are related to ambient temperature (heat maintenance hypothesis), or/and explained by variati...
Presentation
Full-text available
Limites actuelles dans l’évaluation de l’impact des éoliennes par mortalité et les conséquences sur l’application de la séquence ERC. Étude du respect des recommandations EUROBATS et description d’un nouveau type d’impact jusqu’ici ignoré ou presque dans la littérature scientifique et dans les procédures d’évaluations environnementales, avec les co...
Poster
Full-text available
Data produced by biodiversity research projects that evaluate and monitor Good Environmental Status have a high potential for use by stakeholders involved in [marine] environmental management. The lack of specific scientific objectives, poor organizational logic, and a characteristically disorganized collection of information leads to a decentraliz...
Presentation
Full-text available
Les projets éoliens représentent un cas particulier pour la mise en application de la séquence ERC. En effet beaucoup d’incertitudes persistent, notamment en ce qui concerne l’efficacité de la réduction et plus encore de la compensation. De nombreuses études démontrent que nous ne savons pas prédire et quantifier les impacts futurs d’un parc éolien...
Presentation
Full-text available
In a European collapse context of many farming species, solutions should be found to stop these losses. Due to intensification of the most part of agriculture, improvements are easily accessible such as input and soil tillage reduction. Such changes are known to have positive effects on biodiversity. However, in some cases negative effects are dete...
Poster
Full-text available
Wind farm developers have to provide an effective mitigation hierarchy: an avoidance and a reduction of negative impacts of wind farm on biodiversity (bats in our case), and to implement offsetting measures when residual impacts persist. Offsetting consists in implementing measures (e.g. hedgerows) that counteract residual losses of biodiversity an...
Chapter
Full-text available
Monitoring the status and trends of species is critical to their conservation and management. However, the current state of biodiversity monitoring is insufficient to detect such for most species and habitats, other than in a few localised areas. One of the biggest obstacles to adequate monitoring is the lack of local capacity to carry out such pro...
Presentation
Full-text available
Data produced by biodiversity research projects that evaluate and monitor Good Environmental Status have a high potential for use by stakeholders involved in [marine] environmental management. The lack of specific scientific objectives, poor organizational logic, and a characteristically disorganized collection of information leads to a decentraliz...
Presentation
Full-text available
Wind farm developers have to provide an effective avoidance and a reduction of the negative impacts on biodiversity (bats in our case), and to implement offset measures when residual impacts persist. Offsetting consists in implementing measures (e.g. hedgerows) that counteract the residual loss of biodiversity and generate gains through management...
Poster
Full-text available
In a production framework of multi-source data in ecology, the equivalence of observation systems and inter-calibration become crucial. Increasingly, integrative trans-disciplinary approaches become necessary in the study of systems where measurement in each discipline is patchy, imprecise and badly distributed. Yet all the variables (biotic, abiot...
Article
Full-text available
We investigated the interacting impacts of urban landscape and gardening practices on the species richness and total abundance of communities of common butterfly communities across France, using data from a nationwide monitoring scheme. We show that urbanization has a strong negative impact on butterfly richness and abundance but that at a local sc...
Article
Full-text available
Background: Space-for-time substitution-that is, the assumption that spatial variations of a system can explain and predict the effect of temporal variations-is widely used in ecology. However, it is questionable whether it can validly be used to explain changes in biodiversity over time in response to land-cover changes. Hypothesis: Here, we hy...
Data
Simplified method applied to the initial set of landscape metrics. (DOCX)
Data
Results of the simplified method. (DOCX)
Data
Results of the analyses including the heterogeneity variables in the PCA of landscape configuration. (DOCX)
Data
Variables coordinates on axis of (A) the initial composition variables with the three selected axes of the CA of the composition, (B) the initial configuration variables with the seven selected axes of the PCA of the configuration (C) the initial configuration variables with the seven selected axes of the PCA of the configuration when configuration...
Data
Description of the data set. (DOCX)
Data
Ecological processes, spatial patterns and landscape descriptions. (DOCX)
Article
Populations of migratory songbirds in western Europe show considerable variation in population trends between both species and regions. The demographic and environmental causes of these large-scale patterns are poorly understood. Using data from Constant Effort mist-netting studies, we investigated relationships between changes in abundance, adult...
Poster
Full-text available
Influence des éoliennes sur la fréquentation des haies et leurs abords par les Chiroptères
Article
Full-text available
Land-use intensification and resulting habitat loss are put forward as the main causes of flower visitor decline. However, the impact of urbanization, the prime driver of land-use intensification in Europe, is poorly studied. In particular, our understanding of whether and how it affects the composition and functioning of flower visitor assemblages...
Article
Full-text available
Recent changes in seaweed communities due to rapid shifts of their environment have been largely documented in temperate waters; however, long-term studies are much scarcer. In this study, we investigated the potential of Dinard Herbarium to inform us on temporal changes in seaweed communities of Brittany since the second half of the 19th century....
Article
Article dans "Faune Sauvage" qui est une une revue de vulgarisation de l'ONCFS. Suite à la publication de l'article Petits carnivores dans Plos One
Article
Full-text available
1.The rapid expansion of systematic monitoring schemes necessitates robust methods to reliably assess species’ status and trends. Insect monitoring poses a challenge where there are strong seasonal patterns, requiring repeated counts to reliably assess abundance. Butterfly Monitoring Schemes (BMSs) operate in an increasing number of countries with...
Technical Report
Full-text available
This report presents the fifth version of the European Grassland Butterfly Indicator, one of the EU biodiversity indicators of the European Environment Agency. The indicator is based on national Butterfly Monitoring Schemes in 22 countries across Europe, most of them active in the European Union. Fluctuations in numbers between years are typical fe...
Data
With the internet, a massive amount of information on species abundance can be collected under citizen science programs. However, these data are often difficult to use directly in statistical inference, as their collection is generally opportunistic, and the distribution of the sampling effort is often not known. In this paper, we develop a general...
Article
Full-text available
We estimated the spatial distribution of 6 Mustelidae species in France using the data collected by the French national hunting and wildlife agency under the "small carnivorous species logbooks" program. The 1500 national wildlife protection officers working for this agency spend 80% of their working time traveling in the spatial area in which they...