Sylvia Anton

Sylvia Anton
French National Institute for Agriculture, Food, and Environment (INRAE) | INRAE · Institut de Génétique Environnement et Protection des Plantes (IGEPP)

PhD

About

150
Publications
15,690
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Introduction
My research interest is focused on the neuroethology of olfactory-guided behaviour in insects. In the past I have mainly worked on the plasticity of the olfactory system in moths using behavioural, neuroanatomical and neurophysiological approaches. How does the olfactory system deal with incoming information as a function of physiological state, the odorant environment or previous experience? In the IGEPP-EGI group I continue to use the same approaches to study olfactory plasticity in aphids, c
Additional affiliations
January 2017 - present
French National Institute for Agriculture, Food, and Environment (INRAE)
Position
  • Researcher
August 2011 - present
University of Angers
January 2004 - July 2011
French National Institute for Agriculture, Food, and Environment (INRAE)

Publications

Publications (150)
Poster
Full-text available
Parasitoid adults need to frequently feed on sugar sources to ensure their survival, dispersal and reproduction. However, not all resources have the same quality: nectar is generally thought as a rich, highly beneficial resource, while homopteran-produced honeydew is considered as a lower quality resource for parasitoids. Sugar-rich resources such...
Article
Essential oils of aromatic plants have a high potential for the development of alternative insect pest management strategies. Especially for the control of stored product pests, alternative methods to replace synthetic insecticides are urgently needed. We evaluate the fumigant toxicity of Myrtus communis, Eucalyptus globulus, Syzygium aromaticum, T...
Article
Full-text available
Essential oils of aromatic plants represent an alternative to classical pest control with synthetic chemicals. They are especially promising for the alternative control of stored product pest insects. Here, we tested behavioral and electrophysiological responses of the stored product pest Tribolium confusum, to the essential oil of a Brazilian indi...
Article
Full-text available
Olfactory circuits change structurally and physiologically during development and adult life. This allows insects to respond to olfactory cues in an appropriate and adaptive way according to their physiological and behavioral state, and to adapt to their specific abiotic and biotic natural environment. We highlight here findings on olfactory plasti...
Article
1. Investigations in nutritional ecology often require the identification of animal feeding patterns in natural conditions (what, where, and when do animals eat). Thus, methods are needed to trace not only individual resource uptake but also the relative use of different resources in a population or community. 2. Recent biochemical developments al...
Article
Experience of host-associated olfactory stimuli during development affects subsequent foraging decisions in many parasitoids, leading to host fidelity. We have recently shown that odours emitted by an alien host-plant complex (HPC) may affect this learning process. However, the consequences of this olfactory experience on parasitoid host foraging d...
Article
Full-text available
Mate finding in most moths is based on male perception of a female-emitted pheromone whose species specificity resides in component chemistry and proportions. Components are individually detected by specialized olfactory receptor neurons (ORNs) projecting into the macroglomerular complex (MGC) of the male brain. We asked how robust ratio recognitio...
Article
Insect intraspecific olfactory communication occurs in a complex sensory environment. Here we present recent results on how the olfactory system extracts specific information from a sensory background, and integrates it with complementary information to improve odor source localization. Recent advances on mechanisms of olfactory mixture processing,...
Article
The confused flour beetle, Tribolium confusum, is a common and severe pest of stored products. Here, using fumigation tests during four different exposure times, we evaluated the toxicity of different doses of essential oil of spike lavender, Lavandula spica and one of its major constituents, linalool, on different life stages of T. confusum under...
Article
Many aphid species reproduce parthenogenetically throughout most of the year, with individuals having identical genomes. Nevertheless, aphid clones display a marked polyphenism with associated behavioural differences. Pea aphids (Acyrthosiphon pisum), when crowded, produce winged individuals, which have a larger dispersal range than wingless indivi...
Article
Essential oils of aromatic plants and their individual volatile components have been tested in pest management strategies for their toxic and often repellent effects on target insects. When evaluating their possible effects on crucial behaviours of the pest insects, the olfactory environment including intraspecific communication cues has to be cons...
Article
Full-text available
Early experience of olfactory stimuli associated with their host-plant complex (HPC) is an important driver of parasitoid foraging choices, notably leading to host fidelity. Mechanisms involved, such as peripheral or central modulation, and the impact of a complex olfactory environment are unknown. Using olfactometer assays, we compared HPC prefere...
Article
Full-text available
Acibenzolar-S-methyl (ASM) is a chemical compound, which is able to induce resistance in several model and non-model plants, but the end-players of this induced defense remain ill-defined. Here, we test the hypothesis that treatment with ASM can protect apple (Malus × domestica) against the rosy apple aphid (Dysaphis plantaginea) and investigate th...
Presentation
Full-text available
Most parasitoid wasps rely on plant-derived food sources such as nectar to ensure their survival and dispersal. However, in conventional single crop farming, flower resources are scarce and often restricted to the border of fields. Lack of such resources leads to a lower abundance and performance of parasitoids, especially in the centre of the fiel...
Poster
Full-text available
Parasitoids forage sequentially for hosts and food sources. In crops, food and/or alternative hosts are often limited to the borders. Within-field resource diversification through intercropping may result in higher parasitoid attraction and retention and enhance biological control. However, much remain to be known about internal and external factor...
Poster
Full-text available
Moth reproduction highly depends on communication with sex pheromones. The male’s olfactory system is finely tuned to the species-specific ratio of several pheromone components emitted by conspecific females, and males respond with a characteristic upwind flight behaviour. Highly specific olfactory receptor neurons (ORNs) on the male antenna detect...
Article
Full-text available
Recognition of intra-specific olfactory signals within a complex environment of plant-related volatiles is crucial for reproduction in male moths. Sex pheromone information is detected by specific olfactory receptor neurons (Phe-ORNs), highly abundant on the male antenna. The information is then transmitted to the pheromone processing macroglomerul...
Article
Full-text available
Animals adapt their behavior according to the environment and their specific needs in a given situation. In order to do so in an appropriate way, they need to detect, analyze, and code the relevant sensory cues. This task is handled by sensory systems and their associated parts in the central nervous system. With few exceptions, the amount of infor...
Article
Full-text available
Neonicotinoid insecticides are widely used to protect plants against pest insects, and insecticide residues remaining in the environment affect both target and non-target organisms. Whereas low doses of neonicotinoids have been shown to disturb the behaviour of pollinating insects, recent studies have revealed that a low dose of the neonicotinoid c...
Article
Full-text available
Experience modifies behaviour in animals so that they adapt to their environment. In male noctuid moths, Spodoptera littoralis, brief pre-exposure to various behaviourally relevant sensory signals modifies subsequent behaviour towards the same or different sensory modalities. Correlated with a behavioural increase in responses of male moths to the...
Article
In insects, olfaction plays a crucial role in many behavioral contexts, such as locating food, sexual partners, and oviposition sites. To successfully perform such behaviors, insects must respond to chemical stimuli at the right moment. Insects modulate their olfactory system according to their physiological state upon interaction with their enviro...
Article
Full-text available
Insect pest management relies mainly on neurotoxic insecticides, including neonicotinoids, leaving residues in the environment. There is now evidence that low doses of insecticides can have positive effects on pest insects by enhan- cing various life traits. Because pest insects often rely on sex pheromones for reproduction, and olfactory syna...
Article
The antennal lobe (AL) of the Noctuid moth Agrotis ipsilon has emerged as an excellent model for studying olfactory processing and its plasticity in the central nervous system. Odor-evoked responses of AL neurons and input-to-output transformations involved in pheromone processing are well characterized in this species. However, the intrinsic elect...
Article
Full-text available
Insects communicating with pheromones are confronted with an olfactory environment featuring a diversity of volatile organic compounds from plant origin. These volatiles constitute a rich and fluctuant background from which the information carried by the pheromone signal must be extracted. Thus, the pheromone receptor neurons must encode into spike...
Article
Full-text available
Specialty section: This article was submitted to Invertebrate Physiology, a section of the journal Frontiers in Physiology Male moths rely on olfactory cues to find females for reproduction. Males also use volatile plant compounds (VPCs) to find food sources and might use host-plant odor cues to identify the habitat of calling females. Both the sex...
Poster
Pheromone communication is crucial for mating in moths, including many agricultural pest species. In general, male moths locate their mating partners by following the plume of a species-specific female-emitted sex pheromone. This behaviour is mediated by highly specific olfactory receptor neurons and sex pheromone information is processed in a dedi...
Poster
Pheromone communication is crucial for mating in moths, including many agricultural pest species. In general, male moths locate their mating partners by following the plume of a species-specific female-emitted sex pheromone. This behaviour is mediated by highly specific olfactory receptor neurons and sex pheromone information is processed in a dedi...
Article
Full-text available
In moths, which include many agricultural pest species, males are attracted by female-emitted sex pheromones. Although integrated pest management strategies are increasingly developed, most insect pest treatments rely on widespread use of neurotoxic chemicals, including neonicotinoid insecticides. Residual accumulation of low concentrations of thes...
Article
Full-text available
In the olfactory system of male moths, a specialized subset of neurons detects and processes the main component of the sex pheromone emitted by females. It is composed of several thousand first-order olfactory receptor neurons (ORNs), all expressing the same pheromone receptor, that contact synaptically a few tens of second-order projection neurons...
Article
Full-text available
Olfactory information mediating sexual behavior is crucial for reproduction in many animals, including insects. In male moths, the macroglomerular complex (MGC) of the primary olfactory center, the antennal lobe (AL) is specialized in the treatment of information on the female-emitted sex pheromone. Evidence is accumulating that modulation of behav...
Poster
Moths, like many other insects, communicate using olfactory cues. Females produce a species-specific sex pheromone, which is detected by males over large distances. Male moths also use flower odours to find food or may use host plant odours as additional cues to localize females. Plant-derived odours, present in large amounts in a natural environme...
Poster
Full-text available
Male noctuid moths rely on olfactory cues to find females for reproduction. They also use volatile plant compounds (VPCs) to find food sources and might use host odor cues to identify the habitat of calling females. Both the sex pheromone and VPCs trigger a well-described oriented flight behavior towards the odor source. Whereas detection and centr...
Poster
Full-text available
In noctuid moths males rely on olfactory cues to find females for reproduction. Males also use volatile plant compounds (VPCs) to find food sources and might use host odor cues to identify the habitat of calling females. Both the sex pheromone released by con-specific females and VPCs trigger a well-described oriented flight behavior towards the od...
Article
Full-text available
Insects communicating with pheromones, be it sex- or aggregation pheromones, are confronted with an olfactory environment rich in a diversity of volatile organic compounds of which plants are the main releaser. Certain of these volatiles can represent behaviorally relevant information, such as indications about host- or non-host plants; others will...
Article
Full-text available
In nature, male moths are exposed to a complex plant odorant environment when they fly upwind to a sex pheromone source in their search for mates. Plant odors have been shown to affect responses to pheromone at various levels but how does pheromone affects plant odor perception? We recorded responses from neurons within the non-pheromonal "ordinary...
Article
Plant volatiles are important cues for many herbivorous insects when choosing a suitable host plant and finding a mating partner. An appropriate behavioral response to sensory cues from plants and other insects is crucial for survival and fitness. As the natural environment can show both large spatial and temporal variability, herbivores may need t...
Article
Full-text available
The quality of electrophysiological recordings varies a lot due to technical and biological variability and neuroscientists inevitably have to select "good" recordings for further analyses. This procedure is time-consuming and prone to selection biases. Here, we investigate replacing human decisions by a machine learning approach. We define 16 feat...
Poster
Full-text available
In moths the localization of the sexual partner requires to recognize a chemical signal: the sex pheromone. This pheromone is emitted by the female and detected by the male which responds by an upwind flight. Under natural conditions, males live in a complex sensory environment containing many different volatile plant compounds (VPCs) with differen...
Article
Full-text available
Most animals including insects rely on olfaction to find their mating partners. In moths, males are attracted by female-produced sex pheromones inducing stereotyped sexual behavior. The behaviorally relevant olfactory information is processed in the primary olfactory centre, the antennal lobe (AL). Evidence is now accumulating that modulation of se...
Data
Nucleotide and deduced amino acid sequences of A. ipsilon DopEcR (AipsDopEcR). Nucleotide (upper line) and amino acid (lower line) numbers are given on the left and on the right. The putative polyadenylation signal (AATAAA) in the 3′-UTR is indicated in italics. TM 1–7 indicate positions of transmembrane-spanning domains. The peptide sequence indic...
Article
Full-text available
INSECTS AND ROBOTS SEARCHING FOR ODOUR SOURCES IN TURBULENT PLUMES FACE THE SAME PROBLEM: the random nature of mixing causes fluctuations and intermittency in perception. Pheromone-tracking male moths appear to deal with discontinuous flows of information by surging upwind, upon sensing a pheromone patch, and casting crosswind, upon losing the plum...
Data
casting and search game theory. Casting-surge is decomposed into a casting path (in red) and a surge path (straight line in black from p to t). A. If no direction information is available, spiral-surge achieves a competitive ratio r = 22.513. B. Given that the target is not downwind, zigzagging-surge achieves a competitive ratio r = 9.0554. (TIF)
Data
Supporting text S1 includes: Segmentation of the On phase in firing response patterns, Receiver operating characteristic (ROC) analysis, On/Off neuron model equations, Casting and search game theory, References. (PDF)
Data
Two-step casting: SK intact. This movie shows an example of the cyborg experiment with two-step casting: On→upwind surge, Off→casting 1 (crosswind zigzag), baseline→casting 2 (non-oriented spiral). (MOV)
Data
Effect of stimulus and air-gap durations. (A) We stimulated On/Off neurons (n = 5) with different stimulus durations (a unique puff, stimulus duration from 100 ms to 1 s). On duration showed a linear dependence on stimulus duration (data are presented as mean±s.d.): On duration = 0.99×(stimulus duration) +18 ms (pearson correlation r2 = 0.97). (B)....
Data
Simulation of the neuron model. (A). ORN population model considered as a non-homogeneous Poisson process with rate parameter λ(t). The population firing rate λ(t) was derived from experimental data (12). The instantaneous firing rate of 42 ORNs recorded for a stimulus dose of 1 ng and stimulus durations of 200 ms, 500 ms and 1 s was fitted as a su...
Data
One-step casting: SK intact vs SK blocked. This movie shows two examples of the cyborg experiments with one-step casting: On→upwind surge, Off and baseline→spiral casting. The EAG input and On/Off neuron output are indicated in red and green, respectively. The movie contains two parts: channel SK intact and blocked. (MOV)
Data
Pheromone detection with multiple neurons. (A). ROC analysis using three On/Off neurons recorded simultaneously (pheromone pulses of 200 ms, doses from 0.001 to 1 ng). Left: ROC curves calculated for single neurons as well as pairs and triplets (pheromone dose = 0.01 ng). Performance increases when the ROC curve is towards the left corner of the RO...
Article
Chemosensory information is crucial for most insects to feed and reproduce. Olfactory signals are mainly used at a distance, whereas gustatory stimuli play an important role when insects directly contact chemical substrates. In noctuid moths, although the antennae are the main olfactory organ, they also bear taste sensilla. These taste sensilla det...
Article
As do vertebrates, insects show a high degree of phenotypic plasticity, which enables them to adapt their behavioural responses to their surrounding world. For example, social insects such as honeybees are able to perform complex learning tasks, similar to vertebrates. Non-social insects such as flies or moths can also associate sensory information...
Book
p>As do vertebrates, insects show a high degree of phenotypic plasticity, which enables them to adapt their behavioural responses to their surrounding world. For example, social insects such as honeybees are able to perform complex learning tasks, similar to vertebrates. Non-social insects such as flies or moths can also associate sensory informati...
Article
Full-text available
Sex pheromones are intraspecific olfactory signals emitted by one sex to attract a potential mating partner. Behavioural responses to sex pheromones are generally highly stereotyped. However, they can be modulated by experience, as male moths previously exposed to female sex pheromone respond with a lower threshold upon further detection, even afte...
Article
Full-text available
Male moths are confronted with complex odour mixtures in a natural environment when flying towards a female-emitted sex pheromone source. Whereas synergistic effects of sex pheromones and plant odours have been observed at the behavioural level, most investigations at the peripheral level have shown an inhibition of pheromone responses by plant vol...
Article
Full-text available
The effect of repeated exposure to sensory stimuli, with or without reward is well known to induce stimulus-specific modifications of behaviour, described as different forms of learning. In recent studies we showed that a brief single pre-exposure to the female-produced sex pheromone or even a predator sound can increase the behavioural and central...
Article
Full-text available
Most animals, including pest insects, live in an "odor world" and depend strongly on chemical stimuli to get information on their biotic and abiotic environment. Although integrated pest management strategies including the use of insect growth regulators (IGRs) are increasingly developed, most insect pest treatments rely on neurotoxic chemicals. Th...
Article
Full-text available
Most animals rely on olfaction to find sexual partners, food or a habitat. The olfactory system faces the challenge of extracting meaningful information from a noisy odorous environment. In most moth species, males respond to sex pheromone emitted by females in an environment with abundant plant volatiles. Plant odours could either facilitate the l...
Data
Responses of pheromone-responding ORNs stimulated with control stimuli. Stimulation with pipettes containing one filter paper with pheromone elicited responses, which were not significantly different from responses to pipettes containing one filter paper with pheromone (1 ng/10 µl, phe) and a second clean filter paper (cfp) or a second filter paper...