Marilyn Beauchaud

• Jean Monnet University

Au cours des dernières décennies, les activités humaines ont entraîné une augmentation de la pollution sonore modifiant les caractéristiques acoustiques des écosystèmes à l'échelle mondiale. Les effets de ces modifications acoustiques suscitent un intérêt croissant sur leurs impacts sur la biocénose et en particulier les poissons. Les effets potent...

The response of invasive species to noise and how it can modulate their behavior and ecological impact have received scant attention. We conducted a two-phase laboratory experiment to investigate the effect of motorboat noise on the quagga mussel, Dreissena rostriformis bugensis. We first measured aggregation during a prolonged rearing phase under...

Anthropogenic noise is globally recognized as a stressor for animals. However, despite evidence of detrimental effects of noise exposure on fish, knowledge about chronic effects on critical early life stages is still scarce. Using a split-brood design to exclude the genetic effect, African cichlids (Maylandia zebra) from the same brood were exposed...

Acoustic communication is linked to fitness traits in many animals, but under the current scenario of global warming, sound signals can be affected by rising temperatures, particularly in ectothermic organisms such as fishes. This study examines the effect of water temperature in acoustic communication in the two-spotted goby, Pomatoschistus flaves...

In oceans, the noise generated by human activities has reached phenomenal proportions, with considerable harmful effects on marine life. Measuring this impact to achieve a sustainable balance for highly vulnerable marine ecosystems, such as coral reefs, is a critical environmental policy objective. Here, we demonstrate that anthropogenic noise alte...

In oceans, the noise generated by human activities has reached phenomenal proportions, with considerable deleterious effects on marine life. Measuring this impact to achieve a sustainable balance for highly vulnerable marine ecosystems such as coral reefs is a major environmental policy objective. Here we show that anthropogenic noise alters the wa...

Anthropogenic noise is globally recognized as a stressor for animals. However, despite evidence of detrimental effects of noise exposure on fish, knowledge about chronic effects on critical early life stages is still scarce. Using a split-brood design to exclude the genetic effect, African cichlids (Maylandia zebra) from the same brood were exposed...

Female cichlid fish living in African great lakes are known to have sensory systems that are adapted to ambient light environments. These sensory system adaptations are hypothesized to have influenced the evolution of the diverse male nuptial coloration. In rock-dwelling Lake Malawi mbuna cichlids, however, the extent to which ambient light environ...

Biological invasions and anthropogenic noise represent two major threats to fresh water ecosystems but the response of invasive species to noise and how it can modulate their behavior and ecological impact have received scant attention. In this study, we conducted a two-phase laboratory experiment to investigate the effect of motorboat noise on the...

In fish, most hormonal productions of the pituitary gland display daily and/or seasonal rhythmic patterns under control by upstream regulators, including internal biological clocks. The pineal hormone melatonin, one main output of the clocks, acts at different levels of the neuroendocrine axis. Melatonin rhythmic production is synchronized mainly b...

Aquatic noise has increased in last decades imposing new constraints on aquatic animals' acoustic communication. Meagre (Argyrosomus regius) produce loud choruses during the breeding season, likely facilitating ag-gregations and mating, and are thus amenable to being impacted by anthropogenic noise. We assessed the impact of boat noise on this spec...

Information transfer between individuals typically depends on multiple sensory channels. Yet, how multi-sensory inputs shape adaptive behavioural decisions remains largely unexplored. We tested the relative importance of audio and visual sensory modalities in opponent size assessment in the vocal cichlid fish, Metriaclima zebra, by playing back mis...

The meagre (Argyrosomus regius, Asso 1801) is one of the world's largest vocal sciaenids with a significant value for fisheries and aquaculture. There is still a lack of information on the meagre's vocal repertoire and hearing abilities, however, studies with many vocal fish species point to the existence of acoustic variability associated with ont...

Communication is essential during social interactions including animal conflicts and it is often a complex process involving multiple sensory channels or modalities. To better understand how different modalities interact during communication, it is fundamental to study the behavioural responses to both the composite multimodal signal and each unimo...

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Animals routinely receive information through different sensory channels, and inputs from a modality may modulate the perception and behavioural reaction to others. In spite of their potential adaptive value, the behavioural correlates of this cross-sensory modulation have been poorly investigated. Due to their predator life, crocodilians deal with...

Il est maintenant admis que plusieurs canaux de communication sont impliqués dans les interactions sociales. Maylandia zebra est un petit cichlidé africain vivant dans des groupes sociaux hiérarchisés capable d'émettre des sons au cours de combats territoriaux. Chez ce poisson, des études précédentes ont déjà montré l'importance des signaux visuels...

poster

Playback experiments have been a useful tool for studying the function of sounds and the relevance of different sound characteristics in signal recognition in many different species of vertebrates. However, successful playback experiments in sound-producing fish remain rare, and few studies have investigated the role of particular sound features in...

Supplementary material 1 : Oscillograms of a sound produced by a male M. zebra during an agonistic interaction (a) before playing it back, and (b) once played back through our broadcasting apparatus (recorded at 15 cm from the loudspeaker, within the aquarium filled with water). For each oscillogram, the detail of a pulse is shown. Two variables (m...

While acoustic communication has been described in adults of various fish species, our knowledge about the ontogeny of fish sound production is limited. In adults, sound signals are known to be involved during aggressive interactions. However, aggressive behaviour may appear early in the life of fishes due to the possible competition for food and s...

Sounds produced by male cichlids Metriaclima zebra during aggressive interactions were recorded to conduct a detailed analysis and to search for potential individual acoustic signatures. Fish from two different size groups (small and large individuals) were analysed. The two groups were significantly different for all acoustic variables considered;...

Behaviour represents a reaction to the environment as fish perceive it and is therefore a key element of fish welfare. This review summarises the main findings on how behavioural changes have been used to assess welfare in farmed fish, using both functional and feeling-based approaches. Changes in foraging behaviour, ventilatory activity, aggressio...

Acoustic signals are produced in many fish species during agonistic or courtship interactions. A way to test the biological role of these sounds is the use of acoustic playback experiments. However, sounds are usually associated with visual displays and playback experiments performed in fish so far, often failed to match acoustic and visual stimuli...

The moving window principle applied to the khi-square periodogram allows, through local successive examinations, a comprehensive study of the biological time series. This method puts forward several cases of transition linked to environmental or physiological changes. Furthermore, we applied the Grassberger and Procaccia method (1983) for the analy...

In self-feeding conditions, a few individual sea bass (Dicentrarchus labrax (L., 1758)) display strong activity in striking the food dispenser, whereas the remaining individuals of the group actuate the feeder weakly or never. Here, we investigated the effects of removal of the individuals showing dominant activity on the social and feeding behavio...

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The individual food-demand behavior of juvenile European sea bass (Dicentrarchus labrax, L.) reared in groups under self-feeding conditions was investigated. The triggering activity on self-feeder, i.e. index of the food-demand activity, agonistic interactions and territorial behavior were monitored for periods of 42 to 68 days in six groups of 50...

In two experiments, a computerized on-demand feeding system coupled with a PIT tag monitoring device was used to continuously record the triggering activity by ca. 50 individual sea bass for 55 days (Exp. 1, initial average body weight and coefficient of variation, CV: 299 g, 15%) and 69 days (Exp. 2, 157 g, 13%). Each group was stocked in 1 m(3) t...

Specialised brain structures allow songbirds to process acoustic signals. One of these brain areas, the NCM (caudomedial neostriatum), shows an immediate-early gene ZENK response when a bird hears a conspecific song. Using a neuro-ethological approach, we investigate if high level of background noise added to conspecific song can modify this song-i...

A 12-week study was conducted to examine the influence of light regime on food intake and growth in juvenile (ca. 3.5 g) largemouth bass (Micropterus salmoides). Fish were reared in 15-l aquaria either under an alternated light/dark cycle (12L:12D; L from 6:00) or under continuous light (24L:0D), and were weighed every 3 weeks. They were fed by han...

In Teleost fish, development, growth, and reproduction are influenced by the daily and seasonal variations of photoperiod and temperature. Early in vivo studies indicated the pineal gland mediates the effects of these external factors, most probably through the rhythmic production of melatonin. The present investigation was aimed at determining whe...