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1. How to count bird calls? Vocal activity indices may provide different insights into bird abundance and behaviour depending on species traits

Author

Anja Hutschenreiter, Ellen Andresen, Margarita Briseño‐Jaramillo, Alejandra Torres‐Araneda, Eduardo Pinel‐Ramos, Jacqueline Baier, and Filippo Aureli

Subjects
Eucometis penicillata, habitat disturbance, Micrastur semitorquatus, Neotropical birds, passive acoustic monitoring, Saltator atriceps, Ecology, QH540-549.5, Evolution, QH359-425
Abstract

Abstract Passive acoustic monitoring (PAM) has become an important tool for surveying birds, and there is a growing demand for approaches to obtain abundance and behavioural information from PAM recordings. Changes in bird populations have been assessed by counting recorded calls and calculating the vocal activity rate (VAR, i.e. the number of calls per recording time). However, bird calls could be counted in various ways and depending on species traits, these call counts could give us different insights on bird abundance, vocal behaviour and/or habitat use. Our study had two goals: (1) to present and evaluate two new indices based on call counts, the detection rate (DR, i.e. the number of 1‐min recordings in which the presence of a target vocalization is detected) and the maximum count per minute (MAX, i.e. the maximum number of calls found in a 1‐min recording); and (2) to present a conceptual framework showing how the interpretations of VAR, DR and MAX could depend on the index and on species traits. For three Neotropical bird species with distinct traits, we calculated VAR, DR and MAX based on PAM data from 25 sites in the Yucatan Peninsula (Mexico) that varied in their degree of anthropogenic habitat disturbance. We found moderate to high correlations between the indices and higher temporal variability in VAR compared to DR and MAX. We also found different effect sizes of habitat disturbance on the three species and indices. We suggest that DR might be a more reliable index of relative abundance than VAR for species whose calling behaviour exhibits a high cue rate and that MAX may be suitable for estimating family or flock size in gregarious birds. Our findings show the potential usefulness of developing new indices based on call counts to generate ecological hypotheses and assess changes in bird abundance and behaviour.

Published
2024
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2. Dominance style is a key predictor of vocal use and evolution across nonhuman primates

Author

Eithne Kavanagh, Sally E. Street, Felix O. Angwela, Thore J. Bergman, Maryjka B. Blaszczyk, Laura M. Bolt, Margarita Briseño-Jaramillo, Michelle Brown, Chloe Chen-Kraus, Zanna Clay, Camille Coye, Melissa Emery Thompson, Alejandro Estrada, Claudia Fichtel, Barbara Fruth, Marco Gamba, Cristina Giacoma, Kirsty E. Graham, Samantha Green, Cyril C. Grueter, Shreejata Gupta, Morgan L. Gustison, Lindsey Hagberg, Daniela Hedwig, Katharine M. Jack, Peter M. Kappeler, Gillian King-Bailey, Barbora Kuběnová, Alban Lemasson, David MacGregor Inglis, Zarin Machanda, Andrew MacIntosh, Bonaventura Majolo, Sophie Marshall, Stephanie Mercier, Jérôme Micheletta, Martin Muller, Hugh Notman, Karim Ouattara, Julia Ostner, Mary S. M. Pavelka, Louise R. Peckre, Megan Petersdorf, Fredy Quintero, Gabriel Ramos-Fernández, Martha M. Robbins, Roberta Salmi, Isaac Schamberg, Valérie A. M. Schoof, Oliver Schülke, Stuart Semple, Joan B. Silk, J. Roberto Sosa-Lopéz, Valeria Torti, Daria Valente, Raffaella Ventura, Erica van de Waal, Anna H. Weyher, Claudia Wilke, Richard Wrangham, Christopher Young, Anna Zanoli, Klaus Zuberbühler, Adriano R. Lameira, and Katie Slocombe

Subjects
communication, sociality, social behaviour, dominance style, vocal, Science
Abstract

Animal communication has long been thought to be subject to pressures and constraints associated with social relationships. However, our understanding of how the nature and quality of social relationships relates to the use and evolution of communication is limited by a lack of directly comparable methods across multiple levels of analysis. Here, we analysed observational data from 111 wild groups belonging to 26 non-human primate species, to test how vocal communication relates to dominance style (the strictness with which a dominance hierarchy is enforced, ranging from ‘despotic’ to ‘tolerant’). At the individual-level, we found that dominant individuals who were more tolerant vocalized at a higher rate than their despotic counterparts. This indicates that tolerance within a relationship may place pressure on the dominant partner to communicate more during social interactions. At the species-level, however, despotic species exhibited a larger repertoire of hierarchy-related vocalizations than their tolerant counterparts. Findings suggest primate signals are used and evolve in tandem with the nature of interactions that characterize individuals' social relationships.

Published
2021
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3. Reconnaissance auditive intergroupe chez les mâles de singes hurleurs noirs (Alouatta pigra) sauvages

Author

Margarita Briseño‑Jaramillo, Alejandro Medina Estrada, and Alban Lemasson

Subjects
carte mentale auditive, expériences de repasse, Reconnaissance vocale, signature vocale individuelle, singe du Nouveau Monde, Science, Zoology, QL1-991
Abstract

La reconnaissance auditive entre les membres d’un groupe est importante pour maintenir une cohésion socio-spatiale chez les espèces forestières où la visibilité dans l’habitat est limitée, mais cela peut aller au-delà du groupe chez les espèces territoriales avec la nécessité de reconnaître ses voisins. Nous avons évalué la capacité à reconnaître individuellement la voix de mâles voisins chez le singe hurleur noir "Alouatta pigra" sauvage au Mexique. Premièrement, nous avons effectué des enregistrements de hurlements spontanés de six mâles adultes, et démontré que le niveau de variabilité acoustique interindividuelle était bien supérieur au niveau de variabilité acoustique intra-individuelle. Deuxièmement, nous avons testé la reconnaissance auditive à l’aide d’un paradigme de violation des attentes basé sur la congruence spatiale des voix diffusées. Dans une population composée de six groupes de singes aux territoires adjacents, nous avons effectué des expériences de repasse par haut-parleur de hurlements. Chaque groupe a été testé dans deux conditions spatiales : cohérente (le haut-parleur est positionné du côté du territoire voisin approprié par rapport à la voix diffusée) et incohérente (le haut-parleur est positionné du côté du territoire opposé). Comme attendu, les individus ont présenté des réactions plus fortes pendant les situations incohérentes (vitesse d’approche, réponse vocale, comportements de marquage territorial). Ainsi, cette étude permet de confirmer l’existence d’un processus d’encodage et de décodage acoustique individuel chez cette espèce. Le paradigme utilisé, démontrant l’existence d’une carte mentale auditive du voisinage, va plus loin que les simples tests de discrimination classiquement utilisés, permettant de réellement parler de reconnaissance individuelle.

Published
2015
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4. Nocturnal Vocal Activity in Captive Bottlenose Dolphins (Tursiops truncatus): Could Dolphins have Presleep Choruses?

Author

Dorothee Kremers, Margarita Briseño Jaramillo, Martin Böye, Alban Lemasson, and Martine Hausberger

Subjects
Nocturnal activity, Resting, Vocal activity, Breathing rate, Cetaceans, Zoology, QL1-991
Abstract

Nocturnal vocal activity in dolphins is often thought to be associated with feeding activity. However, when no food resources are available dolphins spend their time for the most part resting/sleeping. While unihemispherically sleeping, dolphins mostly swim slowly and synchronously in close proximity with one or more other individuals. Although vocal activity is lower during resting/sleeping, dolphins are not entirely silent the entire night. However, nothing is known about the temporal patterning of vocal activity at night and its potential relation with activity in dolphins. Here we recorded the vocal activity of a group of five captive bottlenose dolphins at night while having no feeding opportunity, examined whether there was any temporal pattern and/or a relation with breathing activity, used here as an index of overall activity. The temporal pattern revealed two peaks of intense whistle activity (8 p.m. and midnight), which were followed by a strong decrease of whistle rate and a slight decrease of respiration rate. We suggest that the high vocal activity at the peak periods might indicate socializing periods and that dolphins, like many other species, show periods of increased social and vocal interactions (chorusing?) before starting to rest/sleep, maybe to ensure the synchrony of slow swimming observed in this species. These findings contribute to a better understanding of nocturnal vocal activity in cetaceans and suggest new lines of research on vocal/social activity of dolphins in relation to presleep and resting behavior.

Published
2014
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5. Dominance style is a key predictor of vocal use and evolution across nonhuman primates

Author

Samantha J. Green, Daria Valente, Zarin P. Machanda, Erica van de Waal, Joan B. Silk, Christopher Young, Daniela Hedwig, Klaus Zuberbühler, Oliver Schülke, Lindsey Hagberg, Sally E. Street, Anna Zanoli, Mary S. M. Pavelka, Martha M. Robbins, Martin N. Muller, Chloe Chen-Kraus, Roberta Salmi, Barbara Fruth, Cristina Giacoma, Isaac Schamberg, Michelle Brown, Louise Peckre, Fredy Quintero, Richard W. Wrangham, Andrew J. J. MacIntosh, Shreejata Gupta, Gillian King-Bailey, Felix O. Angwela, Eithne Kavanagh, Stuart Semple, Zanna Clay, Melissa Emery Thompson, Claudia Wilke, Camille Coye, Julia Ostner, Cyril C. Grueter, Marco Gamba, Raffaella Ventura, Margarita Briseño-Jaramillo, Hugh Notman, Sophie Marshall, Jérôme Micheletta, Thore J. Bergman, Bonaventura Majolo, Anna H. Weyher, Megan Petersdorf, Valérie A. M. Schoof, Gabriel Ramos-Fernández, Maryjka B. Blaszczyk, Kirsty E. Graham, Adriano R. Lameira, Morgan L. Gustison, Alban Lemasson, Karim Ouattara, Alejandro Estrada, Laura M. Bolt, David Macgregor Inglis, Peter M. Kappeler, Valeria Torti, Claudia Fichtel, Barbora Kuběnová, Stéphanie Mercier, J. Roberto Sosa-López, Katharine M. Jack, Katie E. Slocombe, University of York [York, UK], Nottingham Trent University, Durham University, University of Michigan [Ann Arbor], University of Michigan System, University of Texas at Austin [Austin], University of Waterloo [Waterloo], Universidad Nacional Autónoma de México (UNAM), University of California [Santa Barbara] (UCSB), University of California, Yale University [New Haven], University of Exeter, Ethologie animale et humaine (EthoS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), No funding was provided specifically for the current paper, but funding which supported data collection at field sites is acknowledged in electronic supplementary material, S11., University of St Andrews. School of Psychology and Neuroscience, University of St Andrews. Institute of Behavioural and Neural Sciences, University of St Andrews. Centre for Social Learning & Cognitive Evolution, Mountains of the Moon University, Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), University of California [Santa Barbara] (UC Santa Barbara), University of California (UC), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), The University of New Mexico [Albuquerque], German Primate Center - Deutsches Primatenzentrum -- Leibniz Insitute for Primate Research -- [Göttingen, Allemagne] (GPC - DPZ), Liverpool John Moores University (LJMU), Max Planck Institute of Animal Behavior, Università degli studi di Torino = University of Turin (UNITO), School of Psychology and Neuroscience [University of St. Andrews], University of St Andrews [Scotland], The University of Western Australia (UWA), Harvard University, Cornell University [New York], Tulane University, Kyoto University, University of Roehampton, United Kingdom, Tufts University [Medford], University of Lincoln, Université de Neufchätel (UNIME), University of Portsmouth, Athabasca University (AU), Centre Suisse de Recherches Scientifiques en Cote d'Ivoire [Abidjan] (CSRS-CI), University of Calgary, New York University [New York] (NYU), NYU System (NYU), Max Planck Institute for Evolutionary Anthropology [Leipzig], Max-Planck-Gesellschaft, University of Georgia [USA], Arizona State University [Tempe] (ASU), Instituto Politecnico Nacional [Mexico] (IPN), Abertay University (Abertay University), Université de Lausanne = University of Lausanne (UNIL), University of Massachusetts [Amherst] (UMass Amherst), University of Massachusetts System (UMASS), University of Pretoria [South Africa], and University of Lethbridge

Subjects
0106 biological sciences, Science, Basic Behavioral and Social Science, 010603 evolutionary biology, 01 natural sciences, Key (music), Style (sociolinguistics), social behaviour, [SCCO]Cognitive science, biology.animal, ddc:570, Behavioral and Social Science, dominance style, 0501 psychology and cognitive sciences, Animal communication, Primate, 050102 behavioral science & comparative psychology, Research Articles, Sociality, QL, Multidisciplinary, biology, communication, QH, Repertoire, 05 social sciences, DAS, QL Zoology, sociality, vocal, C800 Psychology, vocal, sociality, communication, dominance style, social behaviour, Dominance hierarchy, Dominance (ethology), communication, sociality, social behaviour, dominance style, vocal, Organismal and Evolutionary Biology, Psychology, Cognitive psychology
Abstract

Animal communication has long been thought to be subject to pressures and constraints associated with social relationships. However, our understanding of how the nature and quality of social relationships relates to the use and evolution of communication is limited by a lack of directly comparable methods across multiple levels of analysis. Here, we analysed observational data from 111 wild groups belonging to 26 non-human primate species, to test how vocal communication relates to dominance style (the strictness with which a dominance hierarchy is enforced, ranging from 'despotic' to 'tolerant'). At the individual-level, we found that dominant individuals who were more tolerant vocalized at a higher rate than their despotic counterparts. This indicates that tolerance within a relationship may place pressure on the dominant partner to communicate more during social interactions. At the species-level, however, despotic species exhibited a larger repertoire of hierarchy-related vocalizations than their tolerant counterparts. Findings suggest primate signals are used and evolve in tandem with the nature of interactions that characterize individuals' social relationships. Publisher PDF

Published
2021

6. Socially mediated overlap in vocal interactions between free-ranging black howler monkeys

Author

Véronique Biquand, Alejandro Estrada, Margarita Briseño-Jaramillo, Alban Lemasson, Mélissa Berthet, Universidad Veracruzana, Universidad Nacional Autónoma de México (UNAM), Institut Jean-Nicod (IJN), Département d'Etudes Cognitives - ENS Paris (DEC), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École des hautes études en sciences sociales (EHESS)-Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS)-Département de Philosophie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Ethologie animale et humaine (EthoS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Consejo Nacional de Ciencia y TecnologiaConsejo Nacional de Ciencia y Tecnologia (CONACyT) [220762], European Research Council European Research Council (ERC) European Commission [788077], Agence Nationale de la Recherche French National Research Agency (ANR) European Commission [ANR-10-IDEX-0001-02, ANR-17-EURE-0017], ANR-10-IDEX-0001,PSL,Paris Sciences et Lettres(2010), ANR-17-EURE-0017,FrontCog,Frontières en cognition(2017), Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), and Normandie Université (NU)-Normandie Université (NU)-Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Male, 0106 biological sciences, Lineage (genetic), media_common.quotation_subject, sex difference, Vocal interaction, 010603 evolutionary biology, 01 natural sciences, Competition (biology), Social life, [SCCO]Cognitive science, Agonistic behaviour, Animals, 0501 psychology and cognitive sciences, Conversation, 050102 behavioral science & comparative psychology, Social Behavior, Alouatta, social coordination, Ecology, Evolution, Behavior and Systematics, media_common, Free ranging, [SDV.BA]Life Sciences [q-bio]/Animal biology, 05 social sciences, Evolutionary biology, platyrrhini, Female, Animal Science and Zoology, vocal interaction, Vocalization, Animal, Psychology, Social behavior
Abstract

International audience; Conversation rules such as overlap avoidance and coordinated overlap have been reported in nonhuman animals, and seem to be adaptive responses to the requirements of social life. Some species display both patterns in an apparently flexible way, but the social factors mediating their respective usage remain poorly documented. We investigated the potential social factors guiding the usage of these temporal rules during collective howling in six free-ranging groups of black howler monkeys (Alouatta pigra). First, we found that adult males' vocalizations rarely overlap those of other callers while most adult females' calls overlap other members' calls, especially that of other females. Second, whereas some call types (notably affiliative calls) are typically emitted without overlap, roars (agonistic loud calls) overlap more frequently. Third, coordinated overlap is more frequent during intergroup competition. Our findings support the hypothesis that overlap avoidance and coordinated overlap are two different (here sex-related) vocal alliance social behaviors, at least for some nonhuman primates. More comparative investigations are now needed to explore further their evolutionary trajectories in this lineage.

Published
2021

7. DOMINANCE STYLE AND VOCAL COMMUNICATION IN NON-HUMAN PRIMATES

Author

Katie, Slocombe, Eithne, Kavanagh, Sally, Street, Angwela, Felix O., Bergman, Thore J., Blaszczyk, Maryjka B., Bolt, Laura M., Margarita, Briseño-Jaramillo, Michelle, Brown, Chloe, Chen-Kraus, Zanna, Clay, Camille, Coye, Melissa Emery Thompson, Alejandro, Estrada, Barbara, Fruth, Claudia, Fichtel, Gamba, Marco, Giacoma, Cristina, Graham, Kirsty E., Samantha, Green, Cyril, Grueter, Shreejata, Gupta, Gustiso, Morgan L., Lindsey, Hagberg, Daniela, Hedwig, Jack, Katharine M., Kappeler, Peter M., Gillian, King-Bailey, Barbora, Kuběnová, Alban, Lemasson, David Macgregor Inglis, Zarin, Machanda, Andrew, Macintosh, Bonaventura, Majolo, Sophie, Marshall, Stephanie, Mercier, Jérôme, Micheletta, Martin, Muller, Hugh, Notman, Karim, Ouattara, Julia, Ostnera, Mary Sm Pavelka, Peckre, Louise R., Megan, Petersdorf, Fredy, Quintero, Gabriel Ramos- Fernández, Robbins, Martha M., Roberta, Salmi, Isaac, Schamberg, Oliver, Schülke, Stuart, Semple, Silk, Joan B., Roberto Sosa-Lopéz, J., Torti, Valeria, Valente, Daria, Raffaella, Ventura, Erica Van De Waal, Weyher, Anna H., Claudia, Wilke, Richard, Wrangham, Christopher, Young, Zanoli, Anna, Klaus, Zuberbühler, and Adriano, Lameira.

Published
2020

8. Individual voice recognition and an auditory map of neighbours in free-ranging black howler monkeys (Alouatta pigra)

Author

Margarita Briseño-Jaramillo, Alejandro Estrada, Alban Lemasson, Instituto de Biología, Universidad Nacional Autónoma de México (UNAM), Ethologie animale et humaine (EthoS), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Normandie Université (NU)-Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Alouatta pigra, New World monkeys, [SDV]Life Sciences [q-bio], Mental auditory map, Voice recognition, Animal Science and Zoology, Individual acoustic signature, Playback, 15. Life on land, Ecology, Evolution, Behavior and Systematics
Abstract

Erratum: We apologize for a mistake in Table 7. Speed listed in Table 7 (values for “Approach to speaker - Speed” in coherent situation) was erroneously calculated. The correct values are for coherent situation: 0.07 ± 0.05 and for incoherent situation: 0.23 ± 0.19. Results of GLMM are now Z = 6.1, P = 0.004.; International audience; Recognizing individuals auditorily is of primal importance in maintaining socio-spatial cohesion among conspecifics within a social group as well as for regulating space use among neighbours, particularly for species dwelling in forests where visual communication is constrained. This study evaluates the capacity of black howler monkeys (Alouatta pigra) in the Palenque National Park, Mexico, to recognize the voices of individual neighbours, using a violation-of-expectation paradigm based on the spatial congruence of voices. First, we assessed intra- vs inter-individual acoustic variations by comparing the acoustic structures of the loud calls of six adult males from three different social groups. Although the acoustic structures of barks were more individually discriminative than those of roars, both loud call types presented significant individual variations. Second, playbacks of sequences composed of barks and roars were studied in order to assess the auditory recognition capacity of six neighbouring groups. Two test situations were presented to each study group: the spatial location of the speaker was either congruent (in the appropriate neighbouring territory) or incongruent (in a territory on the opposite side) with the voice broadcast. Monkeys reacted significantly more (e.g. faster approach, more vocal responses) in incongruent situations. Our data suggest that black howler monkeys display individual acoustic variations and are capable of recognizing the voices of non-group members. Our experimental paradigm is an easily replicable way to investigate inter-group voice recognition in animals and to test the extent of socio-spatial cognitive abilities.

Published
2015

9. Erratum to: Individual voice recognition and an auditory map of neighbours in free-ranging black howler monkeys (Alouatta pigra)

Author

Margarita Briseño-Jaramillo, Alejandro Estrada, Alban Lemasson, Ethologie animale et humaine (EthoS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Instituto de Biología, Universidad Nacional Autónoma de México (UNAM), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), and Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM)

Subjects
Evolutionary Biology, Free ranging, Speech recognition, [SDV]Life Sciences [q-bio], Space use, Cognition, 15. Life on land, Biology, Social group, Animal ecology, Animal Science and Zoology, Zoology, Behavioral Sciences, Ecology, Evolution, Behavior and Systematics
Abstract

Recognizing individuals auditorily is of primal importance in maintaining socio-spatial cohesion among conspecifics within a social group as well as for regulating space use among neighbours, particularly for species dwelling in forests where visual communication is constrained. This study evaluates the capacity of black howler monkeys (Alouatta pigra) in the Palenque National Park, Mexico, to recognize the voices of individual neighbours, using a violation-of-expectation paradigm based on the spatial congruence of voices. First, we assessed intra- vs inter-individual acoustic variations by comparing the acoustic structures of the loud calls of six adult males from three different social groups. Although the acoustic structures of barks were more individually discriminative than those of roars, both loud call types presented significant individual variations. Second, playbacks of sequences composed of barks and roars were studied in order to assess the auditory recognition capacity of six neighbouring groups. Two test situations were presented to each study group: the spatial location of the speaker was either congruent (in the appropriate neighbouring territory) or incongruent (in a territory on the opposite side) with the voice broadcast. Monkeys reacted significantly more (e.g. faster approach, more vocal responses) in incongruent situations. Our data suggest that black howler monkeys display individual acoustic variations and are capable of recognizing the voices of non-group members. Our experimental paradigm is an easily replicable way to investigate inter-group voice recognition in animals and to test the extent of socio-spatial cognitive abilities.

Published
2015

10. Nocturnal Vocal Activity in Captive Bottlenose Dolphins (Tursiops truncatus): Could Dolphins have Presleep Choruses?

Author

Alban Lemasson, Martin Böye, Martine Hausberger, Margarita Briseño Jaramillo, Dorothee Kremers, Ethologie animale et humaine (EthoS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Autónoma de México (UNAM), Zooparc Planète Sauvage, Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), European Association for Aquatic Mammals, and ETHOS, UMR6552

Subjects
0106 biological sciences, Cetaceans, [SDV]Life Sciences [q-bio], 010604 marine biology & hydrobiology, 05 social sciences, Zoology, Breathing rate, General Medicine, Biology, Nocturnal, 01 natural sciences, [SDV] Life Sciences [q-bio], Resting, Vocal activity, [SCCO]Cognitive science, lcsh:Zoology, [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology, 0501 psychology and cognitive sciences, lcsh:QL1-991, 14. Life underwater, 050102 behavioral science & comparative psychology, Nocturnal activity, human activities, ComputingMilieux_MISCELLANEOUS
Abstract

Lemasson & Hausberger : Equal contribution; International audience; Nocturnal vocal activity in dolphins is often thought to be associated with feeding activity. However, when no food resources are available dolphins spend their time for the most part resting/sleeping. While unihemispherically sleeping, dolphins mostly swim slowly and synchronously in close proximity with one or more other individuals. Although vocal activity is lower during resting/sleeping, dolphins are not entirely silent the entire night. However, nothing is known about the temporal patterning of vocal activity at night and its potential relation with activity in dolphins. Here we recorded the vocal activity of a group of five captive bottlenose dolphins at night while having no feeding opportunity, examined whether there was any temporal pattern and/or a relation with breathing activity, used here as an index of overall activity. The temporal pattern revealed two peaks of intense whistle activity (8 p.m. and midnight), which were followed by a strong decrease of whistle rate and a slight decrease of respiration rate. We suggest that the high vocal activity at the peak periods might indicate socializing periods and that dolphins, like many other species, show periods of increased social and vocal interactions (chorusing?) before starting to rest/sleep, maybe to ensure the synchrony of slow swimming observed in this species. These findings contribute to a better understanding of nocturnal vocal activity in cetaceans and suggest new lines of research on vocal/social activity of dolphins in relation to presleep and resting behavior.

Published
2014

11. Do dolphins rehearse show-stimuli when at rest? Delayed matching of auditory memory

Author

Alban Lemasson, Martin Böye, Dorothee Kremers, Martine Hausberger, Margarita Briseño Jaramillo, Ethologie animale et humaine (EthoS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Zooparc Planète Sauvage, Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), We thank the management of Planète Sauvage and the trainer staff of the Cité Marine for their cooperation as well as Françoise Joubaud and Jean-Pierre Richard for logistic support. Thank you to Carol Sankey and Ann Cloarec for correcting the English. This study was funded by ANR 'ORILANG' and IUF., Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), European Association for Aquatic Mammals, and ETHOS, UMR6552

Subjects
sensory-motor-phases separation, Echoic memory, [SDV]Life Sciences [q-bio], lcsh:BF1-990, Context (language use), Sensory system, auditory memory processes, cetacean acoustic plasticity, 03 medical and health sciences, [SCCO]Cognitive science, 0302 clinical medicine, Marine mammal, biology.animal, Psychology, 0501 psychology and cognitive sciences, 14. Life underwater, 050102 behavioral science & comparative psychology, ComputingMilieux_MISCELLANEOUS, General Psychology, Original Research, Communication, Copying, biology, Whale, business.industry, 05 social sciences, sensory–motor-phases separation, interspecific vocal copying, [SDV] Life Sciences [q-bio], lcsh:Psychology, Mimicry, Vocal learning, business, 030217 neurology & neurosurgery
Abstract

Alban Lemasson and Martine Hausberger have contributed equally to this work.; International audience; The mechanisms underlying vocal mimicry in animals remain an open question. Delphinidae are able to copy sounds from their environment that are not produced by conspecifics. Usually, these mimicries occur associated with the context in which they were learned. No reports address the question of separation between auditory memory formation and spontaneous vocal copying although the sensory and motor phases of vocal learning are separated in a variety of songbirds. Here we show that captive bottlenose dolphins pro-duce, during their nighttime resting periods, non-dolphin sounds that they heard during performance shows. Generally, in the middle of the night, these animals produced vocal copies of whale sounds that had been broadcast during daily public shows. As their life his-tory was fully known, we know that these captive dolphins had never had the opportunity to hear whale sounds before then. Moreover, recordings made before the whale sounds started being broadcast revealed that they had never emitted such sounds before. This is to our knowledge the first evidence for a separation between formation of auditory mem-ories and the process of learning to produce calls that match these memories in a marine mammal. One hypothesis is that dolphins may rehearse some special events heard during the daytime and that they then express vocally what could be conceived as a more global memory. These results open the way for broader views on how animals might rehearse life events while resting or maybe dreaming.

Published
2011

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