Marc Théry

Marc Théry
French National Centre for Scientific Research | CNRS · Institut écologie et environnement (INEE)

PhD, HDR

About

138
Publications
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Publications

Publications (138)
Article
Exposure to artificial light at night (ALAN) is a risk factor for organisms. Considering the spread and increasing intensity of night brightness across the globe, and the key role of light at all biological levels, alterations of ecosystems are expected. Yet, we cannot predict the severity of the effects of ALAN in several biomes because little inf...
Article
While endotherms can rely on their insulation to reduce heat loss to adapt to cold environments, renewing of fur during molt impairs insulation while they have to perfuse the periphery to support epidermal tissues. The southern elephant seal Mirounga leonina undertakes an annual catastrophic molt while fasting on land in a wet, windy and cold envir...
Article
Full-text available
Southern elephant seals (Mirounga leonina) are known to move and aggregate while molting, but little is known about their behavior on land during this time. In this study, 60 adult females were monitored (23 with GPS tags) during four molting seasons, between 2012 and 2016 at Kerguelen Archipelago, Indian Ocean. Population surveys were recorded eac...
Article
Full-text available
Species traits have been hypothesized by one of us (Ponge, 2013) to evolve in a correlated manner as species colonize stable, undisturbed habitats, shifting from “ancestral” to “derived” strategies. We predicted that generalism, r-selection, sexual monomorphism, and migration/gregariousness are the ancestral states (collectively called strategy A)...
Article
Full-text available
Artificial light at night (ALAN) is an increasing phenomenon worldwide. It causes a wealth of biological and ecological effects that may eventually affect populations and ecosystems. Despite the growing concern about ALAN, little is known about the light levels species are exposed to at night, especially for wetlands and underwater habitats. We det...
Data
(a-d) Irradiance spectra measured on all sites under a clear (blue) and an overcast (brown) sky at a night. (PDF)
Data
Nocturnal irradiance spectra measured at 28 sites under a clear and an overcast sky. (XLSX)
Data
Map of irradiance values measured under an overcast sky during a moonless night. The grey areas represent the built areas in and around Angers. The hydrographic network is represented by blue lines. Irradiance values are given in μW/cm2: Dark blue (0–0.025), light blue (0.025-.050), orange (0.050–1), yellow (>1). (PNG)
Data
Map of irradiance values measured under a clear sky during a moonless night. The grey areas represent the built areas in and around Angers. The hydrographic network is represented by blue lines. Irradiance values are given in μW/cm2: Dark blue (0–0.025), light blue (0.025-.050), orange (0.050–1), yellow (>1). (PNG)
Data
Transmission spectra of water for 6 sites representing the range of variation encountered in our study. (EPS)
Data
Database of irradiance measurements. The location of sampling sites, date and time of measurement, and irradiance values under clear and overcast skies during moonless nights are given. (XLSX)
Article
Full-text available
Unlike most phocid species (Phocidae), Mirounga leonina (southern elephant seals) experience a catastrophic moult where they not only replace their hair but also their epidermis when ashore for approximately 1 month. Few studies have investigated behavioural and physiological adaptations of southern elephant seals during the moult fast, a particula...
Article
Plastic phenotypes are expected to be favoured in heterogeneous environments compared with stable environments. Sensory systems are interesting to test this theory because they are costly to produce and support, and strong fitness costs are expected if they are not tuned to the local environment. Consistently, the visual system of several species c...
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Full-text available
Characterizing fitness landscapes associated with polymorphic adaptive traits enables investigation of mechanisms allowing transitions between fitness peaks. Here, we explore how natural selection can promote genetic mechanisms preventing heterozygous phenotypes from falling into non-adaptive valleys. Polymorphic mimicry is an ideal system to inves...
Article
1.Müllerian mimicry between chemically defended preys is a textbook example of natural selection favouring phenotypic convergence onto a shared warning signal. Studies of mimicry have concentrated on deciphering the ecological and genetic underpinnings of dramatic switches in mimicry association, producing a well-known mosaic distribution of mimicr...
Article
Adverse effects of light at night are associated with human health problems and with changes in seasonal reproduction in several species. Owing to its role in the circadian timing system, melatonin production is suspected to mediate excess nocturnal light. To test this hypothesis, we examined the effect of light pollution on the timing of seasonal...
Article
Full-text available
We experimentally investigated the influence of developmental plasticity of ultraviolet (UV) visual sensitivity on predation efficiency of the larval smooth newt, Lissotriton vulgaris. We quantified expression of SWS1 opsin gene (UV-sensitive protein of photoreceptor cells) in the retinas of individuals who had developed in the presence (UV) or abs...
Article
Full-text available
Conspicuous colouration in unpalatable organisms acts as a warning signal of their unprofitability, a phenomenon known as aposematism. The protection conferred by such colouration can lead to evolutionary convergence in warning signals between aposematic species, because sharing warning signals reduces the per capita cost of predator learning. Cons...
Article
Full-text available
Ultraviolet (UV) vision exists in several animal groups. Intuitively, one would expect this trait to be favoured in species living in bright environments, where UV light is the most present. However, UV sensitivity, as deduced from sequences of UV photoreceptors and/or ocular media transmittance, is also present in nocturnal species, raising questi...
Article
Mate selection in heterogeneous sensory environments may be challenging. Assessing the suitability of potential partners may be compromised if individual characteristics cannot be assessed reliably across all encountered conditions. The problem is particularly acute in a species recognition context if matings with heterospecific partners yield lowe...
Article
Full-text available
Mammals use variations in the length of day to anticipate environmental changes and time their reproduction. Light pollution, which affects day length perception, could lead to changes in biological functions. To explore the effects of light pollution on seasonal reproduction, we conducted an experimental study on a strict long-day breeder, the noc...
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Whether sexual selection and species recognition involve distinct preferences and signals is still debated. Earlier work showed that traits under sexual selection can reduce the efficiency of species recognition but remains uncertain on how frequently such a conflict occurs. We can, however, hypothesise that overlapping distributions of sexual sign...
Article
Many species breed in heterogeneous environments where conditions affecting signaling fidelity may vary. Species recognition may be impaired under particular environmental conditions enhancing the hybridization risk. We investigated the influence of habitat on species recognition efficiency in two hybridizing newts, Lissotriton vulgaris and L. helv...
Article
Antagonistic interactions between predators and prey often lead to co-evolution. In the case of toxic prey, aposematic colours act as warning signals for predators and play a protective role. Evolutionary convergence in colour patterns among toxic prey evolves due to positive density-dependent selection and the benefits of mutual resemblance in spr...
Article
Antagonistic interactions between predators and prey often lead to co-evolution. In the case of toxic prey, aposematic colours act as warning signals for predators and play a protective role. Evolutionary convergence in colour patterns among toxic prey evolves due to positive density-dependent selection and the benefits of mutual resemblance in spr...
Article
Full-text available
Among anthropogenic pressures, light pollution altering light/dark cycles and changing the nocturnal component of the environment constitutes a threat for biodiversity. Light pollution is widely spread across the world and continuously growing. However, despite the efforts realized to describe and understand the effects of artificial lighting on fa...
Article
Iridescent colours produced during moult likely play an important role in pair formation in birds. We sought to quantify geographic variation in such colouration in a duck species, Eurasian teal Anas crecca , in winter (when mating occurs) to evaluate whether this variation refl ects birds ’ breeding origins or diff erential individual migration st...
Article
Full-text available
The endogenous circadian clock is entrained by external cues, mainly the light-dark cycle received by photopigments located in the retina. The authors investigated (1) the effect of aging on the synchronization of the rest-activity rhythm and (2) the physiological basis of light photoreception in the gray mouse lemur, a nocturnal Malagasy primate....
Article
Full-text available
Functional communication in the UV range has been reported in Invertebrates and all major groups of Vertebrates but Amphibians. Although perception in this wavelength range has been shown in a few species, UV signalling has not been demonstrated in this group. One reason may be that in lentic freshwater habitats, litter decomposition generates diss...
Data
Effect of filters on irradiance spectra. Irradiance spectra for the UV+ (grey lines) and UV− treatments (black lines). Irradiance is the product of the irradiance produced by the light tube times the transmittance of the filter. (TIF)
Article
Full-text available
The use of non-human primate models is required to understand the ageing process and evaluate new therapies against age-associated pathologies. The present article summarizes all the contributions of the grey mouse lemur Microcebus murinus, a small nocturnal prosimian primate, to the understanding of the mechanisms of ageing. Results from studies o...
Article
The use of non-human primate models is required to understand the ageing process and evaluate new therapies against age-associated pathologies. The present article summarizes all the contributions of the grey mouse lemur Microcebus murinus, a small nocturnal prosimian primate, to the understanding of the mechanisms of ageing. Results from studies o...
Article
In nocturnal treefrogs, mate choice implies the use of acoustic and visual signals. Multimodality is suspected to have evolved for either information redundancy or information complementariness. It is essential to explore multimodality in a natural context to understand the selection pressures operating on the signals. In the present study, we inve...
Article
Full-text available
In nocturnal anurans, females often have to choose a mate in a sensory-challenging situation-noisy background and high density of potential mates. Multimodality can help female choice by improving mate choice accuracy or reducing time to choose. Here, we conducted 2 choice experiments in the European tree frog (Hyla arborea) to test this question i...
Article
Full-text available
As ecosystems undergo changes worldwide, physiological flexibility is likely to be an important adaptive response to increased climate instability. Extreme weather fluctuations impose energetical constraints such as unpredictable food shortage. We tested how grey mouse lemurs (Microcebus murinus) could adjust their daily heterothermy and locomotor...
Article
Full-text available
In nocturnal anurans, females often have to choose a mate in a sensory-challenging situation—noisy background and high density of potential mates. Multimodality can help female choice by improving mate choice accuracy or reducing time to choose. Here, we conducted 2 choice experiments in the European tree frog (Hyla arborea) to test this question i...
Chapter
Full-text available
This chapter aims at a broad exploration of the literature pertinent to the subject of spider camouflage, from web colour and decorations, body colour to movement. It is an extended and updated version of a previous paper (Théry & Casas 2009). Several functions have been assigned to spider web decorations, the most extensively studied being visuall...
Article
Full-text available
The striking diversity in insect colouration, colour pattern and visual appearance (shape, size, texture or movement) has evolved in response to the needs of communication, both with conspecifics and visually guided predators. The question ‘how are insects viewed by their predators?’ hides a complex set of evolutionary processes, which we review he...
Article
Full-text available
The mammalian endogenous circadian clock, the suprachiasmatic nuclei, receives environmental inputs, namely the light-dark cycle, through photopigments located in the eye and from melanopsin-expressing retinal ganglion cells. The authors investigated the influence of light wavelength and intensity on the synchronization of the rest-activity rhythm...
Article
Full-text available
The question of whether a species matches the colour of its natural background in the perspective of the correct receiver is complex to address for several reasons; however, the answer to this question may provide invaluable support for functional interpretations of colour. In most cases, little is known about the identity and visual sensory abilit...
Article
Growing empirical evidence supports the hypothesis of male mate choice for female ornaments which are thought to reflect individual quality and future breeding ability. While structural colors are clearly used in mate choice and pairing, the condition dependence of such traits is less obvious, particularly in females. We present spectral measuremen...
Article
Full-text available
The recent discovery of the use of visual cues for mate choice by nocturnal acoustic species raises the important, and to date unaddressed, question of how these signals affect the outcome of mate choice predicted by female preference for male calls. In order to address this question, we presented female Hyla arborea tree frogs with a series of cho...
Article
Although nocturnal anurans use vision for reproductive communication, it remains unknown whether they see colours at night. Here, we explored this question in the European treefrog (Hyla arborea), by conducting two mate choice experiments under controlled light conditions. Experiments involved static male models with identical calls but different v...
Article
Although nocturnal anurans use vision for reproductive communication, it remains unknown whether they see colours at night. Here, we explored this question in the European treefrog (Hyla arborea), by conducting two mate choice experiments under controlled light condi- tions. Experiments involved static male models with identical calls but different...
Article
Full-text available
Visual cues are known to be used by numerous animal taxa to gather information on quality and localisation of resources. Because environmental lighting can interfere with the spectral features of visual cues, the specific characteristics of the colour signals that promote forager decision and learning are still not known in the majority of insects...
Article
Full-text available
Elaborate secondary sexual traits, such as plumage ornaments, are important signals in reproductive communication and so it is important to maintain them in good condition. Time and energy spent in their maintenance reinforce the honesty of the ornamental traits. Variation in plumage visual properties as a function of maintenance has until now rece...
Article
Full-text available
Nocturnal frog species rely extensively on vocalization for reproduction. But recent studies provide evidence for an important, though long overlooked, role of visual communication. In many species, calling males exhibit a conspicuous pulsing vocal sac, a signal bearing visually important dynamic components. Here, we investigate female preference f...
Article
Full-text available
La pollution lumineuse a des conséquences importantes pour les astronomes amateurs et pro-fessionnels, qui ont de plus en plus de difficultés à observer les astres de faible luminosité. Il est maintenant nécessaire de s'éloi-gner de plusieurs dizaines voire de centaines de kilomètres des agglomérations pour échapper aux halos lumineux. Par ailleurs...
Article
Full-text available
Diverse functions have been assigned to the visual appearance of webs, spiders and web decorations, including prey attraction, predator deterrence and camouflage. Here, we review the pertinent literature, focusing on potential camouflage and mimicry. Webs are often difficult to detect in a heterogeneous visual environment. Static and dynamic web di...
Article
Full-text available
In many socially monogamous birds, both partners perform extrapair copulations (EPC). As this behaviour potentially inflicts direct costs on females, they are currently hypothesized to search for genetic benefits for descendants, either as 'good' or 'complementary' genes. Although these hypotheses have found some support, several studies failed to...