Denis Lafage

Denis Lafage
LOGRAMI

Ph.D

About

43
Publications
9,690
Reads
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272
Citations

Publications

Publications (43)
Article
Full-text available
Wetlands are among the most threatened habitats in the world, and so are their species, which suffer habitat loss due to climate and land use changes. Freshwater species, and especially arthropods, receive comparatively little attention in conservation plans, and the goals to stop and reverse the destruction of wetlands published 25 years ago in a...
Article
Full-text available
As top consumers and generalist predators, spiders are ideal organisms to study food webs and complex ecological functions using stable isotopes. Most researchers use whole-body samples to analyze stable isotope ratios in spiders. Spiders can regrow lost legs and produce multiple molts during a life cycle, and nonlethal sampling utilizing legs and...
Article
Full-text available
Aim Species distribution models (SDMs) have emerged as essential tools in the equipment of many ecologists, useful to explore species distributions in space and time and answering an assortment of questions related to biogeography, climate change biology and conservation biology. Historically, most SDM research concentrated on well‐known organisms,...
Article
Full-text available
Spiders are a highly diversified group of arthropods and play an important role in terrestrial ecosystems as ubiquitous predators, which makes them a suitable group to test a variety of eco-evolutionary hypotheses. For this purpose, knowledge of a diverse range of species traits is required. Until now, data on spider traits have been scattered acro...
Article
Full-text available
Although functional and phylogenetic diversities are increasingly used in ecology for a variety of purposes, their relationship remains unclear, and this relationship likely differs among taxa, yet most recent studies focused on plants. We hypothesize that communities may be diverse in functional traits due to presence of: many phylogenetic lineage...
Presentation
Full-text available
how multiplying diversity metrics to study spider diversity help assessing ecological processe
Article
Full-text available
Mechanisms underlying biological diversities at different scales have received significant attention over the last decades. The hypothesis of whether local abiotic factors, driving functional and phylogenetic diversities, can differ among taxa of arthropods remains under-investigated. In this study, we compared correlations and drivers of functiona...
Article
Full-text available
Salt marshes are under increasing anthropogenic pressures that have been reported to affect the diet of fish (e.g., change in prey composition and availability), eventually resulting in alterations in their nursery function. Most studies in Europe are based on fish gut content analysis, which only reflect a small proportion of pressures to salt mar...
Article
Full-text available
Most species encounter large variations in abiotic conditions along their distribution range. The physiological responses of most terrestrial ectotherms (such as insects and spiders) to clinal gradients of climate, and in particular gradients of temperature, can be the product of both phenotypic plasticity and local adaptation. This study aimed to...
Preprint
Full-text available
Most species encounter large variations in abiotic conditions along their distribution range. Climate, and in particular temperature, varies along clinal gradients, which determines phenotypic plasticity, local adaptations and associated physiological responses of most terrestrial ectotherms, such as insects and spiders. This study aimed to determi...
Preprint
Full-text available
Although functional and phylogenetic diversities are increasingly used in ecology for a large variety of purposes, their relationships remain unclear and likely vary presumably over taxa, yet most recent studies focused on plant communities. Different concepts predict that a community becomes functionally more diverse by adding phylogenetic lineage...
Preprint
Full-text available
Species distribution models (SDMs) are emerging as essential tools in the equipment of many ecologists; they are useful in exploring species distributions in space and time and in answering an assortment of questions related to historical biogeography, climate change biology and conservation biology. Given that arthropod distributions are strongly...
Preprint
Full-text available
Wetlands are among the most threatened habitats in the world, and so are their species, which suffer habitat loss due to climate and land use changes. Freshwater species and arthropods receive little attention in research and conservation, and the goals to stop and reverse the destruction of wetlands published 25 years ago in a manifesto by the Uni...
Article
Full-text available
Abstract Fishing spiders (Dolomedes spp.) make an interesting model to predict the impact of global changes because they are generalist, opportunistic predators, whose distribution is driven mostly by abiotic factors. Yet, the two European species are expected to react differently to forthcoming environmental changes, because of habitat specializat...
Preprint
Full-text available
Salt marshes are under high, and increasing, anthropogenic pressures that have notably been reported to affect the diet of several fish species, probably resulting in nursery function alterations. Most of the previous studies in Europe were yet based on gut content analysis of fish, which can be considered a snapshot of immediate impacts of salt-ma...
Preprint
Full-text available
While mechanisms underlying biological diversities at different scales received huge attention over the last decades, whether local abiotic factors driving functional and phylogenetic diversities can differ among ecologically and phylogenetically closely related taxa remains under-investigated. In this study, we compared correlations and drivers of...
Preprint
Full-text available
Fishing spiders (Dolomedes spp.) make an interesting model to predict the impact of global changes because they are generalist, opportunistic predators, whose distribution is driven mostly by abiotic factors. Yet, the two European species are expected to react differently to forthcoming environmental changes, because of habitat specialization and i...
Article
Full-text available
As a key predator group, spiders have received a lot of attention by food web ecologists. The difficulty involved in studying their diet has led to the use of new technologies such as metabarcoding of gut contents. The amplification of a broad range of spider prey without amplifying spiders themselves is challenging. Until now, an efficient univers...
Article
Full-text available
While many arthropod species are known to depend, directly or indirectly, on certain plant species or communities, it remains unclear to what extent vegetation shapes spider assemblages. In this study, we tested whether the activity-density, composition, and diversity of ground-dwelling spiders were driven by changes in vegetation structure. Field...
Preprint
Full-text available
As a key predator group, spiders have received a lot of attention by food web ecologists in diverse fields such as pest control, pollutant transfers, and cross-ecosystem fluxes. The difficulty involved in studying their diet has led to the use of new technologies such as metabarcoding of gut contents. The amplification of a broad range of spider pr...
Poster
Full-text available
To restore sedimentary and ecological continuity, the « Loire River and its tributaries restoration Plan » aims to remove the weirs from the majority of secondary channels throughout the largest French catchment area (117 500 km²). In this context, two weirs have been destroyed in 2014 upstream (diffluence) and downstream (confluence) of the Louet...
Article
Full-text available
Cross‐boundary fluxes of organisms and matter, termed “subsidies,” are now recognized to be reciprocal and of roughly equal importance for both aquatic and terrestrial systems, even if terrestrial input to aquatic ecosystems has received most attention. The magnitude of aquatic‐to‐terrestrial subsidies is well documented, but the drivers behind the...
Preprint
Full-text available
Cross-boundary fluxes of organisms and matter, termed 'subsidies', are now recognized to be reciprocal and of roughly equal importance for both aquatic and terrestrial systems, even if terrestrial input to aquatic ecosystems has received most attention. The magnitude of aquatic to terrestrial subsidies is well documented, but the drivers behind the...
Preprint
Full-text available
While many arthropod species are known to depend, directly or indirectly, on certain plant species or communities, it remains unclear to what extent vegetation shapes assemblages of other taxa, notably predators. In this study, we tested whether the abundance, composition, and diversity of ground-dwelling spiders were driven by changes in vegetatio...
Article
Full-text available
How to assess conservation status of habitats, and particularly fl oristic diversity at landscape and community scales is still an outstanding issue. Here we propose a framework including remote sensing, calculation of landscape metrics and the use of diversity indicators to achieve this goal. The framework was tested for two consecutive years in m...
Article
Full-text available
Short-term effects of horse grazing on spider assemblages of a dry meadow (Western France). In this study, the biodiversity impacts of a little studied herbivore, the horse, were assessed in a high conservation value habitat of dry meadows in Brittany (Western France). Spiders, a diversified and abundant group of predators, were used as bioindicato...
Article
Full-text available
In Europe, agri-environment schemes (AES) have been implemented to counteract the effects of agricultural intensification. Studies investigating the role of management improvement induced by AES are quite numerous, but rarely take into account the effect of natural perturbations such as flooding, although severe disturbances are well known to shape...
Article
Full-text available
A large number of studies have tried to understand the determinants of local species richness, i.e. α-diversity. Studies dealing with β-diversity are considerably less numerous but their number has increased in the recent years. In this study, we assessed the relative importance of local and landscape (i.e. composition and connectivity) variables i...
Article
Despite the expected increase in extreme flood frequency, the manner in which terrestrial arthropods cope with regular submersion of their habitat remains poorly understood in meadows, especially in temperate floodplains. Here, we studied the recolonisation dynamics of arthropods after a severe spring flood in the Loire Valley (France). We carried...
Article
Despite the expected increase in extreme flood frequency, the manner in which terrestrial arthropods cope with regular submersion of their habitat remains poorly understood in meadows, especially in temperate floodplains. Here, we studied the recolonisation dynamics of arthropods after a severe spring flood in the Loire Valley (France). We carried...
Thesis
Full-text available
Species assemlblages are stuctured by biotic and abiotic factors acting at local and landscape scales. In floodplains, assemblages are also exposed to perturbations, mainly due to flooding and management. These perturbations, are particularly important in the meadows of the Loire Valley which are managed by cutting and grazing and host rare animal...
Article
Full-text available
Species assemlblages are stuctured by biotic and abiotic factors acting at local and landscape scales. In floodplains, assemblages are also exposed to perturbations, mainly due to flooding and management. These perturbations, are particularly important in the meadows of the Loire Valley which are managed by cutting and grazing and host rare animal...
Article
1. Remotely sensed data are frequently employed for monitoring vegetation and for estimating herbivore diversity. Their use for predicting predator arthropod species abundance and richness has also been investigated with success for ants and beetles in forests using NDVI and for beetles in mountain forests using LiDAR data. 2. We investigated whet...
Article
The impact of different cutting dates on two dominant groups of ground-dwelling arthropods (carabids and spiders) was assessed. Short-term impacts were assessed by comparing them before and after cutting. Arthropods were collected by pitfall traps located in three plots with different cutting dates between June and August and one uncut control plot...
Article
Urbanization creates human disturbance that plays an important role in ecosystem dynamics. Most of the time, there is a time lag between disturbance and colonization. Opportunistic species with high dispersal power colonize first, while habitat specialist species with a lower power of dispersal colonize later; the communities changewith time after...
Article
Full-text available
The European eel population is in decline. Urgent management actions are required. To monitor their effect, we developed a fast sampling method, applicable in shallow rivers and tributaries. We compared the Carle & Strub estimator from 35 double pass electric fishing samples with Point Abundance Sampling by Electrofishing or PASE (24 point samples...

Questions

Question (1)
Question
In our case, prey might be both terrestrial and aquatic so I need primers that amplify at least:
- Diptera (including chironomidae)
- Lepidoptera
- Coleoptera
- Collembola
- Trichoptera
- Plecoptera
- Ephemeroptera
... without amplifying spiders !
Of course, I have already selected LCO 1490 / HCO 2198... But maybe there are other options...

Network

Cited By

Projects

Projects (3)
Project
The main purpose of this project is to collect papers and researcher that work on understanding the factors underlying species abundance, food web structure and biodiversity of arthropods in wetlands, with a particular focus on constructed wetlands. Within this purpose, a second focus is to understand synergies and trade-offs between biodiversity and a range of ecosystem services often connected to wetlands (nutrient retention, carbon sinks, water holding capacity etc).
Project
The project aims at determining patterns and drivers of community assembly and cross-boundary fluxes of species and matter at the land-sea interface focusing on both aquatic and terrestrial predators. We specifically want to test the effect of salt marsh size in conjunction with tidal amplitude and frequency.