O. Adam

O. Adam
Université Paris-Sud 11 | Paris 11 · Centre de Neurosciences Paris-Sud

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68
Publications
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Introduction
Skills and Expertise

Publications

Publications (68)
Article
Sperm whales live in the matrilineal population structure based on complex social interactions. Groups of 10-20 adult females stay together and raise their offspring. During social activities, they emit specific patterned time sequences of clicks, called codas. These codas are also the social unit acoustic signature. However, no associations were a...
Article
Full-text available
The long-term monitoring of long-lived animals often requires individual identification. For cetaceans, this identification may be based on morphological characters observable from a boat such as shape, spots and cuts of the back, fluke and dorsal fins. However, for some species such as the sperm whales (Physeter macrocephalus), this approach may b...
Article
Full-text available
Adult male sperm whales (Physeter macrocephalus) are long distance runners of the marine realm, feeding in high latitudes and mating in tropical and subtropical waters where stable social groups of females and immatures live. Several areas of uncertainty still limit our understanding of their social and breeding behavior, in particular concerning t...
Article
Full-text available
Getting maternal milk through nursing is vital for all newborn mammals. Despite its importance, nursing has been poorly documented in humpback whales (Megaptera novaeangliae). Nursing is difficult to observe underwater without disturbing the whales and is usually impossible to observe from a ship. We attempted to observe nursing from the calf's per...
Article
Morphometric studies of humpback whales (Megaptera novaeangliae) occurring in the Indian Ocean area have been limited by the technology currently available. In the Sainte Marie channel, Madagascar, straightforward aerial single-camera photogrammetry was tested on mother-calf pairs that combines standard Unoccupied Aerial Vehicle (UAV) with free, ea...
Article
Full-text available
We describe an art–science project called “Feral Interactions—The Answer of the Humpback Whale” inspired by humpback whale songs and interactions between individuals based on mutual influences, learning process, or ranking in the dominance hierarchy. The aim was to build new sounds that can be used to initiate acoustic interactions with these whale...
Preprint
Full-text available
Here are the 2021 updated identity cards of the 13 male sperm whales observed off Mauritius since 2013. This file is part of the preprint "Underwater photo-identification of marine megafauna: an identity card catalogue of sperm whales (Physeter macrocephalus) off Mauritius Island"
Preprint
Full-text available
Adult male sperm whales (Physeter macrocephalus) are long distance runners of the marine realm, feeding in high latitudes and mating in tropical and subtropical waters where stable social groups of females and immatures live. Several areas of uncertainty still limit our understanding of their social and breeding behaviour, in particular concerning...
Preprint
Full-text available
The long-term monitoring of long-lived animal populations often requires individual identification. For cetacean populations, this identification is mostly based on morphological characters observable from a boat such as shape, spots and cuts of the back, caudal and dorsal fins. This is well suited for species easily displaying their caudal fins, s...
Article
It is currently widely recognized that automated methods are crucial to help processing long-term recordings of marine bioacoustics. To evaluate the efficiency of such methods, it is essential to develop large-scale annotated datasets. However, besides being laborious and resource intensive, recent studies have suggested that such a task could also...
Article
Full-text available
Synchronous behaviours occur when two or more animals display the same behaviour at the same time. However, the mechanisms underlying this synchrony are not well understood. In this study, we carried out an experiment to determine whether or not Bottlenose dolphins use acoustic cues when performing a known synchronised exercise. For this, we record...
Article
Full-text available
Understanding the organization and dynamics of social groups of marine mammals through the study of kin relationships is particularly challenging. Here, we studied a stable social group of sperm whales off Mauritius, using underwater observations, individual-specific identification, non-invasive sampling and genetic analyses based on mitochondrial...
Article
Full-text available
Visual observations of the marine biodiversity can be difficult in specific areas for different reasons, including weather conditions or a lack of observers. In such conditions, passive acoustics represents a potential alternative approach. The objective of this work is to demonstrate how information about marine biodiversity can be obtained via de...
Poster
Full-text available
Humpback whale is known for the complex songs performed by the males to attract females, during the migration and mating season. The south western of Indian ocean is a breeding area from July to September for tis species. This is the first interregional acoustic study of this area which aim to better understand the cultural song transmission of hum...
Article
Full-text available
Exploratory behaviour includes all the actions that an animal performs to obtain information about a new object, environment or individual through using its different senses of perception. Here, we studied the development of the exploratory behaviour of a bottlenose dolphin (Tursiops truncatus) calf aged from 39 to 169 days, by investigating its ac...
Article
Odontocetes modulate the rhythm of their echolocation clicks to draw information about their environment. When they approach preys to capture, they speed up their emissions to increase the sampling rate of "distant touch" and improve information update. This global acceleration turns into a "terminal buzz" also described in bats, which is a click t...
Article
Full-text available
The Sainte Marie Channel on the northeast coast of Madagascar is an important breeding ground for humpback whales; the first observation of birth was documented there, yet it has never been investigated for phenology and habitat use of humpback whales. The present study was aimed at examining temporal and spatial distribution patterns and the encou...
Article
Many Mysticetes (baleen whales) are acoustically active marine mammals. This is epitomized by rorquals, and specifically male humpback whales (Megaptera novaeangliae) whose complex songs comprise a wide range of vocalizations. The sound production mechanism of odontocetes (toothed whales, including dolphins and porpoises) is well described, in cont...
Article
Automatically detecting sound units of humpback whales in complex time-varying background noises is a current challenge for scientists. In this paper, we explore the applicability of Convolution Neural Network (CNN) method for this task. In the evaluation stage, we present 6 bi-class classification experimentations of whale sound detection against...
Article
Humpback whales breeding in the southwest Indian Ocean are thought to exhibit population substructure between Madagascar and east Africa. To investigate regional movements, breeding behavior and habitat utilization, 23 whales were satellite-tagged off Madagascar during peak breeding season off the northeast and southwest coasts. Mean tag duration w...
Article
Full-text available
Assessing the movement patterns and key habitat features of breeding humpback whales is a prerequisite for the conservation management of this philopatric species. To investigate the interactions between humpback whale movements and environmental conditions off Madagascar, we deployed 25 satellite tags in the northeast and southwest coast of Madaga...
Data
Supplementary material is available in a pdf file. Figure S1. Mean surface current (m/s) in the Southwest Indian Ocean during the winter 1995-2009 according to the SWIO12 climatological model. Southward branch of the South equatorial current represents the East Madagascar Current (EMC). Stars represent the well-known breeding areas of humpback whal...
Chapter
Basé sur les avancées des connaissances scientifiques sur les compétences des animaux et l’histoire des relations hommes/animaux, ce livre est le premier ouvrage complet en France dédié à ces questions. Une première partie réunit les connaissances actuelles sur les compétences des animaux à la lumière des découvertes les plus récentes. Dans une sec...
Article
Full-text available
Bottlenose dolphins are highly social cetaceans with an extensive sound production including clicks, burst-pulsed sounds, and whistles. Some whistles, known as signature whistles, are individually specific. These acoustic signatures are commonly described as being emitted in contexts of stress during forced isolation and as group cohesion calls. In...
Chapter
This chapter presents an original approach for the development of an automatic music transcription system of a Malagasy traditional plucked string instrument, called marovany zither. Our approach is based on a technology of multichannel capturing sensory system, which allows breaking down a complex polyphonic audio signal into a sum of monophonic s...
Poster
Full-text available
STUDY OF SOTALIA GUIANENSIS SOUNDS IN FRENCH GUIANA
Article
Male humpback whales emit songs during the breeding season. These songs are made with successive vocalizations called sound units. The study of these songs is based on the classification of these sound units, especially to extract the song theme of the singers in a specific area during a specific season. Recently, some approaches are proposed for a...
Article
The bioacoustic event indexing has to be scaled in space (oceans and large forests, multiple sensors), and in species number (thousand). We discuss why time-frequency featuring is inefficient compared to the sparse coding (SC) for soundscape analysis. SC is based on the principle that an optimal code should contain enough information to reconstruct...
Article
Full-text available
Humpback whales breeding in the southwest Indian Ocean are thought to exhibit population substructure between Madagascar and east Africa. To investigate regional movements, breeding behavior and habitat utilization, 23 whales were satellite-tagged off Madagascar during peak breeding season off the northeast and southwest coasts. Mean tag duration w...
Conference Paper
Full-text available
La population de baleine à bosse de l'ouest de l'océan Indien a été appelée stock C par la Commission Baleinière Internationale (CBI, http://iwc.int/). Pendant la période de reproduction, son aire de distribution se dessine de la côte est de l'Afrique à l'archipel des Mascareignes (Report of the Scientific Committee of the IWC, 1998). Ce stock se d...
Chapter
Full-text available
Passive acoustics is now a common tool used to observe cetacean species. The recordings of sounds emitted by whales and dolphins are used to detect the individuals, to classify their sounds and to localize them during their dives. A scientific workshop on these topics was created in 2003 and was called "International Workshop on Detection, Classif...
Article
Full-text available
Hidden Markov Models (HMMs) are widely used for speech recognition tasks but have been used rarely for the classification of bioacoustics signals. This study proposes a new approach for the supervised classification of the calls that compose humpback whale (Megaptera novaeangliae) song sequences with the use of HMMs, based on the concept of subunit...
Article
Songs of humpback whales (Megaptera novaeangliae) have been studied for several years to gain a deeper insight on the intraspecific social interactions. Such a complex acoustic display is indeed thought to play an important role in both the mating ritual and male to male interaction. Hence, the need to classify the unit constituents of a song objec...
Article
Full-text available
Various methods exist for observing marine mammals, each having its advantages and drawbacks. It is possible to employ more one method simultaneously as they are complementary. This article presents these methods and focuses on the use of passive acoustics for marine mammal observation. We provide specifics on the required material, the various und...
Article
Full-text available
Mieux connaître les densités de population des cétacés est un des objectifs clés pour évaluer leur tendance et établir le statut de leur conservation des espèces et leur habitat. Il s’agit de renseigner le suivi des populations (croissance-stabilisation-décroissance) à court et moyen terme pour l’ensemble des mammifères marins, qu’ils soient réside...
Conference Paper
The songs produced by male humpback whales, Megaptera novaeangliae, during the breeding season have been increasingly studied in the last couple of decades with methods based mainly on their spectrographic characteristics. Songs were characterised as series of units - defined by Payne as continuous sounds between two silences - associated in specif...
Conference Paper
Passive acoustics is one of the methods for marine mammal observations. This approach is complementary of visual observations or use of tags. Different projects for marine mammals' acoustics observatory (permanent or mobile) are actually in construction. A part of them are included in biggest multidisciplinary projects and especially in geophysics...
Article
Analysis of click-type signals in the presence of noise with time-varying statistics is a challenging task, especially in low signal-to-noise ratio conditions. This well-known problem is commonly present in underwater passive acoustics applications. In this paper we present a novel solution for this dilemma as applied to marine mammal acoustics - a...
Article
One of the objectives of sperm whale signal analysis is to automatically detect the clicks emitted by sperm whales in continuous recordings and to then extract features that allow for the tracking of these animals. Sperm whale signals are particularly brief with a large band spectrum. Also, during the recordings, the noise levels are not always con...
Article
Depth and range of sound sources can be estimated using a single hydrophone. Such a passive acoustic technique requires the detection of direct path transmitted, sea surface, and seafloor reflected source signals, so as to measure their time of arrival differences (TOADs). Sperm whales almost continuously emit powerful, directional echolocation sou...
Article
Full-text available
Eleven Klebsiella pneumoniae clinical isolates and one Klebsiella oxytoca clinical isolate showing various pulsed-field gel electrophoresis types and producing an inducible DHA-1 class C β-lactamase were isolated in the Parisian region between 1998 and 2003. The aim of this study was to compare the genetic organization of the blaDHA-1 genes in this...
Conference Paper
This paper proposes a non-stationary time-series segmentation method based on the analysis of the forward prediction error issued from the adaptive Schur orthogonal signal parameterisation. There is no a priori information about the analysed signal thus this method can be easily adapted to a large family of different types of signals for which two...
Conference Paper
The paper proposes a new effective analytic signal representation dedicated to underwater signal analysis. The proposed approach is based on the recursive normalized exact least-square ladder estimation algorithm because of its excellent convergence behaviour, extremely fast start-up performance and its capability to quickly track parameter changes...
Conference Paper
Full-text available
Sperm whales (Physeter macrocephalus) make series of transient echolocation sounds (clicks), when foraging. Clicks reflect to the sea surface and the seafloor when propagating towards a receiver. The detection of the once reflected surface and seafloor echoes of a click, and the measurement of the delays of both echoes to the direct path transmitte...
Article
Sperm whales make deep dives to hunt. A dive, lasting 45 minutes on average, is composed of a vertical descent to the prey layer depth, the properly so called hunt (at a quasi constant depth) inside the prey layer, and a vertical ascent back to the sea surface. Sperm whales make series of echolocation signals (clicks) during the two first stages. T...
Article
In this paper, we present a new computerised technique for the automatic construction of the latency intensity curve (LI curve). We take a pattern recognition approach determined by a priori information. We use knowledge gained from the audiogram and from physiological considerations. Therefore, we consider all recordings at different intensities a...
Article
In Brainstem Auditory Evoked Potentials (BAEPs) extraction systems, BAEP recognition by determining wave latencies I, II, III and IVV is an importantant stage for pronostic assistance. We suggest in this paper a new approach for BAEP recognition. The recognition is based on modelling BAEP using wavelet transform; latencies are then automatically me...
Article
The authors study the autoregressive and moving average (ARMA) filter for lidar signal processing. After a short presentation of the atmospheric laser Doppler instrument project (ALADIN), they introduce the objective of this paper, which is to extract the Doppler frequency and to retrieve the spectral width of a noised lidar signal. A general prese...
Article
Previous studies have attributed harmful effects to ultrasonic frequencies and recently many have addressed the problem of early deafness among dentists caused by high-speed air turbines. In this study, we measured the spectra of the sounds generated by high-speed air turbines, ranging from audible to ultrasonic frequencies (0–70 kHz). The hypothes...
Conference Paper
Our aim is to overcome the problem of the periodic stimulation that causes an overlapping in both the time and frequency domains between late evoked potentials (EPs) corresponding to the (i-1)th stimulus and the brainstem auditory evoked potential (BAEP) to be estimated corresponding to the i'th stimulus. In order to reduce the contributions of lat...
Conference Paper
This paper presents a new approach for estimating the Brainstem Auditory Evoked Potentials (BAEP). The originality of this method is that it is not content only on the observation defined as the response to the stimulation, but integrates also information about the stimulus and the Evoked Potentials (EPs) properties. The authors model the physiolog...
Conference Paper
Using a neural network to identify models and predict signals allows to go beyond the linear domain. In this paper, we show the advantage of using neural network for these signal processing applications. Thus, the function charactering the cell (sigmoïd or others) allows the study of non-linear models. Using feedback links specific to a recurrent n...

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Projects

Projects (2)
Project
Within the framework of the Maubydick project, focusing on the long-term monitoring of sperm whales in Mauritius, passive underwater observation and video recording were used to improve individual identification. Individual-specific sloughed-skin sampling allowed to study kin relationships in a social group formed by adult females and juveniles. Adult males were also identified and are under study.